Category Archives: fashion

The secret behind the world’s lightest chronograph watch (whisper: it’s graphene)

This latest watch from the Richard Mille company by way of the University of Manchester isn’t the lightest watch the company has ever made but it is their lightest, most complex watch yet at less than 1.5 oz. It also has a breathtaking price tag. More about that later.

An August 29, 2018 news item on Nanowerk announces the publication of research related to the graphene-enhanced watch,

In January 2017 the world’s lightest mechanical chronograph watch was unveiled in Geneva, Switzerland, showcasing innovative composite development by using graphene. Now the research behind the project has been published. The unique precision-engineered watch was a result of collaboration between The University of Manchester [UK], Richard Mille Watches and McLaren Applied Technologies.

An August 29, 2018 University of Manchester press release, which originated the news item, gives further detail,

The RM 50-03 watch was made using a unique composite incorporating graphene to manufacture a strong but lightweight new case to house the watch mechanism which weighed just 40 grams in total, including the strap.

The collaboration was an exercise in engineering excellence, exploring the methods of correctly aligning graphene within a composite to make the most of the two-dimensional materials superlative properties of mechanical stiffness and strength whilst negating the need for the addition of other, weightier materials.

Now the research behind this unique watch has been published in the journal, Composites Part A: Applied Science and Manufacturing. The work was primarily carried out by a group of researchers at The University of Manchester’s National Graphene Institute.

Leading the research Professor Robert Young said: “In this work, through the addition of only a small amount of graphene into the matrix, the mechanical properties of a unidirectionally-reinforced carbon fibre composite have been significantly enhanced.

“This could have future impact on precision-engineering industries where strength, stiffness and product weight are key concerns such in as aerospace and automotive.”

The small amount of graphene used was added to a carbon fibre composite with the goal of improving stiffness and reducing weight by requiring the use of less overall material. Since graphene has high levels of stiffness and strength, its use as a reinforcement

in polymer composites shows huge potential of further enhancing the mechanical properties of composites.

The final results were achieved with only a 2% weight fraction of graphene added to the epoxy resin. The resulting composite with graphene and carbon fibre was then analysed by tensile testing and the mechanisms were revealed primarily by using Raman spectroscopy and X-ray CT scans.

The benefits of this research demonstrate a simple method which can be incorporated into existing industrial processes, allowing for engineering industries to benefit from graphene mechanical properties, such as the manufacture of airplane wings or the body work of high-performance cars.

The research group discovered that when comparing with a carbon fibre equivalent specimen, the addition of graphene significantly improved the tensile stiffness and strength. This occurred when the graphene was dispersed through the material and aligned in in the fibre direction.

Dr Zheling Li, a University of Manchester Research Associate said: “This study presents a way of increasing the axial stiffness and strength of composites by simple conventional processing methods, and clarifying the mechanisms that lead to this reinforcement.”

Aurèle Vuilleumier R&D Manager at Richard Mille said: “This project is a perfect example of technology transfer from the university to the product. The partnership with McLaren Applied Technologies allows a broad diffusion of graphene-enhanced composites in the industry. As a tangible result, a world record light and strong watch was available for our customers: the RM 50-03.”

Dr Broderick Coburn, Senior Mechanical Design Engineer at McLaren Applied Technologies said: “The potential of graphene to enhance composites’ structural properties has been known and demonstrated at a lab-scale for some time now. This application, although niche, is a great example of those structural benefits making it through to a prepreg material, and then into an actual product.”

The University of Manchester will soon be celebrating the opening of its second world-class graphene facility, the Graphene Engineering Innovation Centre (GEIC), set-to open later this year. The GEIC will allow industry to work alongside academic expertise to translate research into prototypes and pilot production and accelerate the commercialisation of graphene.

Here’s a link to and a citation for the paper,

Realizing the theoretical stiffness of graphene in composites through confinement between carbon fibers by Jingwen Chu, Robert J.Young, Thomas J.A.Slater, Timothy L.Burnett, Broderick Coburn, Ludovic Chichignoud, Aurèle Vuilleumier, Zheling Li. Composites Part A: Applied Science and Manufacturing Volume 113, October 2018, Pages 311-317 DOI: https://doi.org/10.1016/j.compositesa.2018.07.032

This paper is open access.

Price tag?

There’s an old saying, ‘if you have to ask, you can’t afford it’. It sprang to mind as I checked out the luxury Swiss watch company’s, Richard MIlle, products. You won’t find a price tag on the company’s RM 50-03’s product page but you will get lots of pictures of the watch mixed in with sports car images alongside chunks of text exhorting the watch and invoking sports car racing, a very expensive sport. And, the sports car images make even more sense when you know that the one of other partners in this academic/commercial venture is a UK leader in the field of motorsport. More from the About page on the McLaren website,

Whatever we apply ourselves to at McLaren, whether in the fields of racing, supercars or technology; we are committed to a journey of relentless improvement that challenges convention, disrupts markets and delivers powerful competitive advantage.

I was not able to find a price list on the Mille or McLaren sites. In fact, the watch does not seem to be mentioned at all on the McLaren website.

Happily, there’s a January 17, 2017 posting by Zach Pina for A Blog To Watch, which kind of reveals the price (Note: Links have been removed),

Forty grams [less than 1.5 oz.]. That’s the total weight, including the strap, of the new Richard Mille RM 50-03 McLaren F1 watch, making it the lightest split-second chronograph with a tourbillon the world has ever seen. Ok, yes – this isn’t exactly an ultra-competitive category – hell, the RM 50-03 is a veritable boat-anchor when compared to the groundbreaking 19-gram [less that .75 oz.] RM 027 Tourbillon Richard Mille built for Rafael Nadal, but that was, by comparison, a much less complicated watch. A mere 40 grams is still an impressive technical feat when you look at just how much is packed into the latest marvel from Richard Mille. The cost for the 40-gram horological wonder? It’ll be seven figures. [The blog post’s title has the price as $1Million.]

Sports cars are expensive and, I guess, so is the technology when it’s adapted to watches. If you’re at all interested, watches, luxury products, and/or the latest high technology, I recommend reading Pina’s entire posting for a lively read,

Richard Mille is no slouch when it comes to passionately creative design and materials (possible understatement of the year, though the year [2017] is still young). However, in breaking new ground for this particular watch, it took a partnership between the Swiss watchmaker, famed British Formula 1 automaker McLaren, and Nobel Prize-winning scientists from the University of Manchester. The product of their collaboration is a case that marries titanium, carbon TPT (thin-ply technology), and a Richard Mille exclusive and apparent watchmaking first: Graph TPT, better known as graphene, that is six times lighter than steel and 200 times as strong. It’s on the cutting edge of materials research and sets the bar for lightweight strength in timepieces.

Should you be hoping for a bargain, I don’t expect they’ve dropped the price in an effort to move product as it reaches its second anniversary since part of the appeal of a luxury product is the cost. In fact, luxury brands destroy product rather than lower the price,

Published on Jul 19, 2018

Burberry is amongst some luxury brands that are burning their stock. Millions of pounds of waste being incinerated to retain exclusivity.

 

Since media have started reporting on this practice, it seems luxury brands are reconsidering their practices.

A potpourri of robot/AI stories: killers , kindergarten teachers, a Balenciaga-inspired AI fashion designer, a conversational android, and more

Following on my August 29, 2018 post (Sexbots, sexbot ethics, families, and marriage), I’m following up with a more general piece.

Robots, AI (artificial intelligence), and androids (humanoid robots), the terms can be confusing since there’s a tendency to use them interchangeably. Confession: I do it too, but, not this time. That said, I have multiple news bits.

Killer ‘bots and ethics

The U.S. military is already testing a Modular Advanced Armed Robotic System. Credit: Lance Cpl. Julien Rodarte, U.S. Marine Corps

That is a robot.

For the purposes of this posting, a robot is a piece of hardware which may or may not include an AI system and does not mimic a human or other biological organism such that you might, under circumstances, mistake the robot for a biological organism.

As for what precipitated this feature (in part), it seems there’s been a United Nations meeting in Geneva, Switzerland held from August 27 – 31, 2018 about war and the use of autonomous robots, i.e., robots equipped with AI systems and designed for independent action. BTW, it’s the not first meeting the UN has held on this topic.

Bonnie Docherty, lecturer on law and associate director of armed conflict and civilian protection, international human rights clinic, Harvard Law School, has written an August 21, 2018 essay on The Conversation (also on phys.org) describing the history and the current rules around the conduct of war, as well as, outlining the issues with the military use of autonomous robots (Note: Links have been removed),

When drafting a treaty on the laws of war at the end of the 19th century, diplomats could not foresee the future of weapons development. But they did adopt a legal and moral standard for judging new technology not covered by existing treaty language.

This standard, known as the Martens Clause, has survived generations of international humanitarian law and gained renewed relevance in a world where autonomous weapons are on the brink of making their own determinations about whom to shoot and when. The Martens Clause calls on countries not to use weapons that depart “from the principles of humanity and from the dictates of public conscience.”

I was the lead author of a new report by Human Rights Watch and the Harvard Law School International Human Rights Clinic that explains why fully autonomous weapons would run counter to the principles of humanity and the dictates of public conscience. We found that to comply with the Martens Clause, countries should adopt a treaty banning the development, production and use of these weapons.

Representatives of more than 70 nations will gather from August 27 to 31 [2018] at the United Nations in Geneva to debate how to address the problems with what they call lethal autonomous weapon systems. These countries, which are parties to the Convention on Conventional Weapons, have discussed the issue for five years. My co-authors and I believe it is time they took action and agreed to start negotiating a ban next year.

Docherty elaborates on her points (Note: A link has been removed),

The Martens Clause provides a baseline of protection for civilians and soldiers in the absence of specific treaty law. The clause also sets out a standard for evaluating new situations and technologies that were not previously envisioned.

Fully autonomous weapons, sometimes called “killer robots,” would select and engage targets without meaningful human control. They would be a dangerous step beyond current armed drones because there would be no human in the loop to determine when to fire and at what target. Although fully autonomous weapons do not yet exist, China, Israel, Russia, South Korea, the United Kingdom and the United States are all working to develop them. They argue that the technology would process information faster and keep soldiers off the battlefield.

The possibility that fully autonomous weapons could soon become a reality makes it imperative for those and other countries to apply the Martens Clause and assess whether the technology would offend basic humanity and the public conscience. Our analysis finds that fully autonomous weapons would fail the test on both counts.

I encourage you to read the essay in its entirety and for anyone who thinks the discussion about ethics and killer ‘bots is new or limited to military use, there’s my July 25, 2016 posting about police use of a robot in Dallas, Texas. (I imagine the discussion predates 2016 but that’s the earliest instance I have here.)

Teacher bots

Robots come in many forms and this one is on the humanoid end of the spectum,

Children watch a Keeko robot at the Yiswind Institute of Multicultural Education in Beijing, where the intelligent machines are telling stories and challenging kids with logic problems  [donwloaded from https://phys.org/news/2018-08-robot-teachers-invade-chinese-kindergartens.html]

Don’t those ‘eyes’ look almost heart-shaped? No wonder the kids love these robots, if an August  29, 2018 news item on phys.org can be believed,

The Chinese kindergarten children giggled as they worked to solve puzzles assigned by their new teaching assistant: a roundish, short educator with a screen for a face.

Just under 60 centimetres (two feet) high, the autonomous robot named Keeko has been a hit in several kindergartens, telling stories and challenging children with logic problems.

Round and white with a tubby body, the armless robot zips around on tiny wheels, its inbuilt cameras doubling up both as navigational sensors and a front-facing camera allowing users to record video journals.

In China, robots are being developed to deliver groceries, provide companionship to the elderly, dispense legal advice and now, as Keeko’s creators hope, join the ranks of educators.

At the Yiswind Institute of Multicultural Education on the outskirts of Beijing, the children have been tasked to help a prince find his way through a desert—by putting together square mats that represent a path taken by the robot—part storytelling and part problem-solving.

Each time they get an answer right, the device reacts with delight, its face flashing heart-shaped eyes.

“Education today is no longer a one-way street, where the teacher teaches and students just learn,” said Candy Xiong, a teacher trained in early childhood education who now works with Keeko Robot Xiamen Technology as a trainer.

“When children see Keeko with its round head and body, it looks adorable and children love it. So when they see Keeko, they almost instantly take to it,” she added.

Keeko robots have entered more than 600 kindergartens across the country with its makers hoping to expand into Greater China and Southeast Asia.

Beijing has invested money and manpower in developing artificial intelligence as part of its “Made in China 2025” plan, with a Chinese firm last year unveiling the country’s first human-like robot that can hold simple conversations and make facial expressions.

According to the International Federation of Robots, China has the world’s top industrial robot stock, with some 340,000 units in factories across the country engaged in manufacturing and the automotive industry.

Moving on from hardware/software to a software only story.

AI fashion designer better than Balenciaga?

Despite the title for Katharine Schwab’s August 22, 2018 article for Fast Company, I don’t think this AI designer is better than Balenciaga but from the pictures I’ve seen the designs are as good and it does present some intriguing possibilities courtesy of its neural network (Note: Links have been removed),

The AI, created by researcher Robbie Barat, has created an entire collection based on Balenciaga’s previous styles. There’s a fabulous pink and red gradient jumpsuit that wraps all the way around the model’s feet–like a onesie for fashionistas–paired with a dark slouchy coat. There’s a textural color-blocked dress, paired with aqua-green tights. And for menswear, there’s a multi-colored, shimmery button-up with skinny jeans and mismatched shoes. None of these looks would be out of place on the runway.

To create the styles, Barat collected images of Balenciaga’s designs via the designer’s lookbooks, ad campaigns, runway shows, and online catalog over the last two months, and then used them to train the pix2pix neural net. While some of the images closely resemble humans wearing fashionable clothes, many others are a bit off–some models are missing distinct limbs, and don’t get me started on how creepy [emphasis mine] their faces are. Even if the outfits aren’t quite ready to be fabricated, Barat thinks that designers could potentially use a tool like this to find inspiration. Because it’s not constrained by human taste, style, and history, the AI comes up with designs that may never occur to a person. “I love how the network doesn’t really understand or care about symmetry,” Barat writes on Twitter.

You can see the ‘creepy’ faces and some of the designs here,

Image: Robbie Barat

In contrast to the previous two stories, this all about algorithms, no machinery with independent movement (robot hardware) needed.

Conversational android: Erica

Hiroshi Ishiguro and his lifelike (definitely humanoid) robots have featured here many, many times before. The most recent posting is a March 27, 2017 posting about his and his android’s participation at the 2017 SXSW festival.

His latest work is featured in an August 21, 2018 news news item on ScienceDaily,

We’ve all tried talking with devices, and in some cases they talk back. But, it’s a far cry from having a conversation with a real person.

Now a research team from Kyoto University, Osaka University, and the Advanced Telecommunications Research Institute, or ATR, have significantly upgraded the interaction system for conversational android ERICA, giving her even greater dialog skills.

ERICA is an android created by Hiroshi Ishiguro of Osaka University and ATR, specifically designed for natural conversation through incorporation of human-like facial expressions and gestures. The research team demonstrated the updates during a symposium at the National Museum of Emerging Science in Tokyo.

Here’s the latest conversational android, Erica

Caption: The experimental set up when the subject (left) talks with ERICA (right) Credit: Kyoto University / Kawahara lab

An August 20, 2018 Kyoto University press release on EurekAlert, which originated the news item, offers more details,

When we talk to one another, it’s never a simple back and forward progression of information,” states Tatsuya Kawahara of Kyoto University’s Graduate School of Informatics, and an expert in speech and audio processing.

“Listening is active. We express agreement by nodding or saying ‘uh-huh’ to maintain the momentum of conversation. This is called ‘backchanneling’, and is something we wanted to implement with ERICA.”

The team also focused on developing a system for ‘attentive listening’. This is when a listener asks elaborating questions, or repeats the last word of the speaker’s sentence, allowing for more engaging dialogue.

Deploying a series of distance sensors, facial recognition cameras, and microphone arrays, the team began collecting data on parameters necessary for a fluid dialog between ERICA and a human subject.

“We looked at three qualities when studying backchanneling,” continues Kawahara. “These were: timing — when a response happens; lexical form — what is being said; and prosody, or how the response happens.”

Responses were generated through machine learning using a counseling dialogue corpus, resulting in dramatically improved dialog engagement. Testing in five-minute sessions with a human subject, ERICA demonstrated significantly more dynamic speaking skill, including the use of backchanneling, partial repeats, and statement assessments.

“Making a human-like conversational robot is a major challenge,” states Kawahara. “This project reveals how much complexity there is in listening, which we might consider mundane. We are getting closer to a day where a robot can pass a Total Turing Test.”

Erica seems to have been first introduced publicly in Spring 2017, from an April 2017 Erica: Man Made webpage on The Guardian website,

Erica is 23. She has a beautiful, neutral face and speaks with a synthesised voice. She has a degree of autonomy – but can’t move her hands yet. Hiroshi Ishiguro is her ‘father’ and the bad boy of Japanese robotics. Together they will redefine what it means to be human and reveal that the future is closer than we might think.

Hiroshi Ishiguro and his colleague Dylan Glas are interested in what makes a human. Erica is their latest creation – a semi-autonomous android, the product of the most funded scientific project in Japan. But these men regard themselves as artists more than scientists, and the Erica project – the result of a collaboration between Osaka and Kyoto universities and the Advanced Telecommunications Research Institute International – is a philosophical one as much as technological one.

Erica is interviewed about her hope and dreams – to be able to leave her room and to be able to move her arms and legs. She likes to chat with visitors and has one of the most advanced speech synthesis systems yet developed. Can she be regarded as being alive or as a comparable being to ourselves? Will she help us to understand ourselves and our interactions as humans better?

Erica and her creators are interviewed in the science fiction atmosphere of Ishiguro’s laboratory, and this film asks how we might form close relationships with robots in the future. Ishiguro thinks that for Japanese people especially, everything has a soul, whether human or not. If we don’t understand how human hearts, minds and personalities work, can we truly claim that humans have authenticity that machines don’t?

Ishiguro and Glas want to release Erica and her fellow robots into human society. Soon, Erica may be an essential part of our everyday life, as one of the new children of humanity.

Key credits

  • Director/Editor: Ilinca Calugareanu
  • Producer: Mara Adina
  • Executive producers for the Guardian: Charlie Phillips and Laurence Topham
  • This video is produced in collaboration with the Sundance Institute Short Documentary Fund supported by the John D and Catherine T MacArthur Foundation

You can also view the 14 min. film here.

Artworks generated by an AI system are to be sold at Christie’s auction house

KC Ifeanyi’s August 22, 2018 article for Fast Company may send a chill down some artists’ spines,

For the first time in its 252-year history, Christie’s will auction artwork generated by artificial intelligence.

Created by the French art collective Obvious, “Portrait of Edmond de Belamy” is part of a series of paintings of the fictional Belamy family that was created using a two-part algorithm. …

The portrait is estimated to sell anywhere between $7,000-$10,000, and Obvious says the proceeds will go toward furthering its algorithm.

… Famed collector Nicolas Laugero-Lasserre bought one of Obvious’s Belamy works in February, which could’ve been written off as a novel purchase where the story behind it is worth more than the piece itself. However, with validation from a storied auction house like Christie’s, AI art could shake the contemporary art scene.

“Edmond de Belamy” goes up for auction from October 23-25 [2018].

Jobs safe from automation? Are there any?

Michael Grothaus expresses more optimism about future job markets than I’m feeling in an August 30, 2018 article for Fast Company,

A 2017 McKinsey Global Institute study of 800 occupations across 46 countries found that by 2030, 800 million people will lose their jobs to automation. That’s one-fifth of the global workforce. A further one-third of the global workforce will need to retrain if they want to keep their current jobs as well. And looking at the effects of automation on American jobs alone, researchers from Oxford University found that “47 percent of U.S. workers have a high probability of seeing their jobs automated over the next 20 years.”

The good news is that while the above stats are rightly cause for concern, they also reveal that 53% of American jobs and four-fifths of global jobs are unlikely to be affected by advances in artificial intelligence and robotics. But just what are those fields? I spoke to three experts in artificial intelligence, robotics, and human productivity to get their automation-proof career advice.

Creatives

“Although I believe every single job can, and will, benefit from a level of AI or robotic influence, there are some roles that, in my view, will never be replaced by technology,” says Tom Pickersgill, …

Maintenance foreman

When running a production line, problems and bottlenecks are inevitable–and usually that’s a bad thing. But in this case, those unavoidable issues will save human jobs because their solutions will require human ingenuity, says Mark Williams, head of product at People First, …

Hairdressers

Mat Hunter, director of the Central Research Laboratory, a tech-focused co-working space and accelerator for tech startups, have seen startups trying to create all kinds of new technologies, which has given him insight into just what machines can and can’t pull off. It’s lead him to believe that jobs like the humble hairdresser are safer from automation than those of, says, accountancy.

Therapists and social workers

Another automation-proof career is likely to be one involved in helping people heal the mind, says Pickersgill. “People visit therapists because there is a need for emotional support and guidance. This can only be provided through real human interaction–by someone who can empathize and understand, and who can offer advice based on shared experiences, rather than just data-driven logic.”

Teachers

Teachers are so often the unsung heroes of our society. They are overworked and underpaid–yet charged with one of the most important tasks anyone can have: nurturing the growth of young people. The good news for teachers is that their jobs won’t be going anywhere.

Healthcare workers

Doctors and nurses will also likely never see their jobs taken by automation, says Williams. While automation will no doubt better enhance the treatments provided by doctors and nurses the fact of the matter is that robots aren’t going to outdo healthcare workers’ ability to connect with patients and make them feel understood the way a human can.

Caretakers

While humans might be fine with robots flipping their burgers and artificial intelligence managing their finances, being comfortable with a robot nannying your children or looking after your elderly mother is a much bigger ask. And that’s to say nothing of the fact that even today’s most advanced robots don’t have the physical dexterity to perform the movements and actions carers do every day.

Grothaus does offer a proviso in his conclusion: certain types of jobs are relatively safe until developers learn to replicate qualities such as empathy in robots/AI.

It’s very confusing

There’s so much news about robots, artificial intelligence, androids, and cyborgs that it’s hard to keep up with it let alone attempt to get a feeling for where all this might be headed. When you add the fact that the term robots/artificial inteligence are often used interchangeably and that the distinction between robots/androids/cyborgs is not always clear any attempts to peer into the future become even more challenging.

At this point I content myself with tracking the situation and finding definitions so I can better understand what I’m tracking. Carmen Wong’s August 23, 2018 posting on the Signals blog published by Canada’s Centre for Commercialization of Regenerative Medicine (CCRM) offers some useful definitions in the context of an article about the use of artificial intelligence in the life sciences, particularly in Canada (Note: Links have been removed),

Artificial intelligence (AI). Machine learning. To most people, these are just buzzwords and synonymous. Whether or not we fully understand what both are, they are slowly integrating into our everyday lives. Virtual assistants such as Siri? AI is at work. The personalized ads you see when you are browsing on the web or movie recommendations provided on Netflix? Thank AI for that too.

AI is defined as machines having intelligence that imitates human behaviour such as learning, planning and problem solving. A process used to achieve AI is called machine learning, where a computer uses lots of data to “train” or “teach” itself, without human intervention, to accomplish a pre-determined task. Essentially, the computer keeps on modifying its algorithm based on the information provided to get to the desired goal.

Another term you may have heard of is deep learning. Deep learning is a particular type of machine learning where algorithms are set up like the structure and function of human brains. It is similar to a network of brain cells interconnecting with each other.

Toronto has seen its fair share of media-worthy AI activity. The Government of Canada, Government of Ontario, industry and multiple universities came together in March 2018 to launch the Vector Institute, with the goal of using AI to promote economic growth and improve the lives of Canadians. In May, Samsung opened its AI Centre in the MaRS Discovery District, joining a network of Samsung centres located in California, United Kingdom and Russia.

There has been a boom in AI companies over the past few years, which span a variety of industries. This year’s ranking of the top 100 most promising private AI companies covers 25 fields with cybersecurity, enterprise and robotics being the hot focus areas.

Wong goes on to explore AI deployment in the life sciences and concludes that human scientists and doctors will still be needed although she does note this in closing (Note: A link has been removed),

More importantly, empathy and support from a fellow human being could never be fully replaced by a machine (could it?), but maybe this will change in the future. We will just have to wait and see.

Artificial empathy is the term used in Lisa Morgan’s April 25, 2018 article for Information Week which unfortunately does not include any links to actual projects or researchers working on artificial empathy. Instead, the article is focused on how business interests and marketers would like to see it employed. FWIW, I have found a few references: (1) Artificial empathy Wikipedia essay (look for the references at the end of the essay for more) and (2) this open access article: Towards Artificial Empathy; How Can Artificial Empathy Follow the Developmental Pathway of Natural Empathy? by Minoru Asada.

Please let me know in the comments if you should have an insights on the matter in the comments section of this blog.

Gold at the nanoscale in medieval textiles

It takes a while (i.e., you have to read the abstract for the paper) to get to the nanoscale part of the story. In the meantime, here are the broad brushstrokes (as it were) from a group of researchers in Hungary, from an Oct. 11, 2017 American Chemical Society (ACS) news release (also on EurekAlert),

Gold has long been valued for its luxurious glitter and hue, and threads of the gleaming metal have graced clothing and tapestries for centuries. Determining how artisans accomplished these adornments in the distant past can help scientists restore, preserve and date artifacts, but solutions to these puzzles have been elusive. Now scientists, reporting in ACS’ journal Analytical Chemistry, have revealed that medieval artisans used a gilding technology that has endured for centuries.

Researchers can learn a lot about vanished cultures from objects left behind. But one detail that has escaped understanding has been the manufacturing method of gold-coated silver threads found in textiles from the Middle Ages. Four decades of intensive research yielded some clues, but the findings have been very limited. Study of the materials has been hindered by their extremely small size: A single metal thread is sometimes only as thick as a human hair, and the thickness of its gold coating is a hundredth of that. Tamás G. Weiszburg, Katalin Gherdán and colleagues set out to fill this gap.

Using a suite of lab techniques, the researchers examined medieval gilded silver threads, and silver and gold strips produced during and after the Middle Ages. The items come from European cultures spanning the 13th to 17th centuries. The researchers characterized the chemistry of the silver thread, its gold coating, the interactions between the two and the shape of metal strips’ edges. To characterize the threads and strips, the researchers combined high-resolution scanning electron microscopy, electron back-scattered diffraction with energy-dispersive electron probe microanalysis and other analytical methods. Though previous studies indicated that these tiny objects were manufactured by a mercury-based method in fashion at that time, the new results suggest that the threads were gilded exclusively by using an ancient method that survived for a millennium. The goldsmiths simply heated and hammered the silver sheets and the gold foil together, and then cut them into strips. It was also possible to determine whether scissor- or knife-like tools were used for cutting. The results also show that this process was used widely in the region well into the 17th century.

The authors acknowledge funding from the European Social Fund.

Here’s an image of medieval bling,

Caption: A new study unravels how medieval artisans embellished textiles with gold. Credit: The American Chemical Society

Finally, here’s the abstract with the information about the nanoscale elements (link to paper follows abstract),

Although gilt silver threads were widely used for decorating historical textiles, their manufacturing techniques have been elusive for centuries. Contemporary written sources give only limited, sometimes ambiguous information, and detailed cross-sectional study of the microscale soft noble metal objects has been hindered by sample preparation. In this work, to give a thorough characterization of historical gilt silver threads, nano- and microscale textural, chemical, and structural data on cross sections, prepared by focused ion beam milling, were collected, using various electron-optical methods (high-resolution scanning electron microscopy (SEM), wavelength-dispersive electron probe microanalysis (EPMA), electron backscattered diffraction (EBSD) combined with energy-dispersive electron probe microanalysis (EDX), transmission electron microscopy (TEM) combined with EDX, and micro-Raman spectroscopy. The thickness of the gold coating varied between 70–400 nm [emphasis mine]. Data reveal nano- and microscale metallurgy-related, gilding-related and corrosion-related inhomogeneities in the silver base. These inhomogeneities account for the limitations of surface analysis when tracking gilding methods of historical metal threads, and explain why chemical information has to be connected to 3D texture on submicrometre scale. The geometry and chemical composition (lack of mercury, copper) of the gold/silver interface prove that the ancient gilding technology was diffusion bonding. The observed differences in the copper content of the silver base of the different thread types suggest intentional technological choice. Among the examined textiles of different ages (13th–17th centuries) and provenances narrow technological variation has been found.

Here’s a link to the paper,

Medieval Gilding Technology of Historical Metal Threads Revealed by Electron Optical and Micro-Raman Spectroscopic Study of Focused Ion Beam-Milled Cross Sections by Tamás G. Weiszburg, Katalin Gherdán, Kitti Ratter, Norbert Zajzon, Zsolt Bendő, György Radnóczi, Ágnes Takács, Tamás Váczi, Gábor Varga and György Szakmány. Anal. Chem., Article ASAP DOI: 10.1021/acs.analchem.7b01917 Publication Date (Web): September 19, 2017

Copyright © 2017 American Chemical Society

This paper is behind a paywall.

One final comment, if you read the abstract, you’ll see how many technologies the researchers needed to use to examine the textiles. How did medieval artisans create nanoscale and microscale gilding when they couldn’t see it? I realize there are now some optical microscopes that can provide a view of the nanoscale but presumably those artisans of the Middle Ages did not have access to that kind of equipment. So, how did they create those textiles with the technology of the day?

Followup on Pashmina nanotech tag story

I’m not sure if this is the same initiative as the one I described in my Feb. 27, 2013 posting about nanotechnology-enabled anti-counterfeiting labels for Pashmina shawls and other products but it seems likely. From a May 16, 2017 article by Athar Parvaiz for factordaily.com,

Until a few years ago, if you were buying a coveted Kashmiri Pashmina, chances were you’d be worried about being sold a fake. Despite having a geographical indications (GI) tag, fakes and machine-made shawls abound in the market.

But a couple of years ago, the Jammu and Kashmir (J&K) government decided to take things in its hands and reinstate buyers’ faith in the Rs 2,000-crore industry, which provides employment to around 300,000 people. It started using nanotechnology to label Pashmina products like shawls, mufflers and stoles to ensure authenticity.

Pashmina artisans say the move has benefitted them greatly, and most of them prefer to sell certified products as they get full price for the authenticated shawls. Experts from the Pashmina Testing and Quality Certification Centre (PTQCC) said they label about 500 shawls per month, which is almost all the products produced in the state, as the number hardly crosses 500 to 600 per month these days.

Gowhar Ahmad, a Pashmina artist from downtown Srinagar, says he’s sold several shawls with authentication labels since the laboratory was established in 2015. “However, customers repeatedly ask about the authenticity of my products as most of them haven’t heard of the certification. When I tell them about it, they run searches on their phones and only then are they convinced,” he said.

“The government should spread information about how it is ensuring the authenticity of Pashmina shawls,” Ahmad said. He added the labelled shawls fetch full price while machine-made products don’t even get half.

Another artist, Nazir Ahmad from Eidgah in Srinagar, agreed that the labelling is helpful, and reiterated Gowhar’s point about the need to spread the word about it outside Kashmir. “The government should also set up more laboratories for certification of Pashmina products,” he added. At present an artisan has to wait for up to seven days to get a shawl labelled. With more laboratories, the wait time can be reduced, he said.

These artisans may soon have reason to cheer. Mustaq Ahmad Shah, assistant director of handicrafts in Srinagar, said the handicrafts department plans to launch an extensive advertising campaign “to spread information on how to tell apart genuine and fake pashmina products following the recent steps taken by the state government to maintain the purity and glory of this heritage industry.” The department is also considering creating more PTQCC  facilities for the benefit of Pashmina artisans, he added.

Parvaiz describes the difference between authentic Pashmina wool products and the counterfeit products, as well as, the certification process,

According to experts, fake Pashmina-makers add nylon to below-standard Pashmina from Mongolia and China so that it can withstand the pressure of being spun on automatic machines. These shawls appear deceptively similar to genuine handmade Pashmina and most buyers get easily duped.

“But, after three-four years, the wool fibre starts shrinking and separating from the nylon, especially after washing,” Yasir Ahmad Mir, a professor at Srinagar’s Craft Development Institute (CDI) said. The extremely fine fibre of Pashmina can’t be spun by machine; it can be only hand-spun, he added.

“We do laboratory tests to determine whether the Pashmina is hand-spun or machine-spun and whether the shawl has been hand-woven or machine-made,” said Younus Farooq, manager at the PTQCC.

If a product withstands the scrutiny of laboratory testing, it gets a a non-detachable secure fusion authentication label (microchip) containing nano-particles with a unique layering code, readable under infrared light. The label contains information about the product along with a unique number. It is stuck on the Pashmina product with the help of heat without compromising on its aesthetics.

It was nice to find a followup article all these years later.

Nanotechnology-enabled warming textile being introduced at Berlin (Germany) Fashion Week July 4 – 7, 2017

Acanthurus GmbH, a Frankfurt-based (Germany) nanotechnology company announced its participation in Berlin Fashion Week’s (July 4 – 7, 2017) showcase for technology in fashion, Panorama Berlin  (according to Berlin Fashion Week’s Fashion Fair Highlights in July 2017 webpage; scroll down to Panorama Berlin subsection).

Here are more details about Acanthurus’ participation from a July 4, 2017 news item on innovationintextiles.com,

This week, Frankfurt-based nanotechnology company Acanthurus GmbH will introduce its innovative nanothermal warming textile technology nanogy at the Berlin FashionTech exhibition. An innovative warming technology was developed by Chinese market leader j-NOVA for the European market, under the brand name nanogy.

A July 3, 2017 nanogy press release, which originated the news item, offers another perspective on the story,

Too cold for your favorite dress? Leave your heavy coat at home and stay warm with ground-breaking nanotechnology instead.

Frankfurt-based nano technology company Acanthurus GmbH has brought an innovative warming technology developed by Chinese market leader j-NOVA© to the European market, under the brand name nanogy. “This will make freezing a thing of the past,” says Carsten Wortmann, founder and CEO of Acanthurus GmbH. The ultra-light, high-tech textiles can be integrated into any garment – including that go-to jacket everyone loves to wear on chilly days. All you need is a standard power bank to feel the warmth flow through your body, even on the coldest of days.

The innovative, lightweight technology is completely non-metallic, meaning it emits no radiation. The non-metallic nature of the technology allows it to be washed at any temperature, so there’s no need to worry about accidental spillages, whatever the circumstances. The technology is extremely thin and flexible and, as there is absolutely no metal included, can be scrunched or crumpled without damaging its function. This also means that the technology can be integrated into garments without any visible lines or hems, making it the optimal solution for fashion and textile companies alike.

nanogy measures an energy conversion rate of over 90%, making it one of the most sustainable and environmentally friendly warming solutions ever developed. The technology is also recyclable, so consumers can dispose of it as they would any other garment.

“Our focus is not just to provide world class technology, but also to improve people’s lives without harming our environment. We call this a nanothermal experience, and our current use cases have only covered a fraction of potential opportunities,” says Jeni Odley, Director of Acanthurus GmbH. As expected for any modern tech company, users can even control the temperature of the textile with a mobile app, making the integration of nanogy a simplified, one-touch experience.

I wasn’t able to find much about j-Nova but there was this from the ISPO Munich 2017 exhibitor details webpage,

j-NOVA.WORKS Co., Ltd.

4-B302, No. 328 Creative Industry Park, Xinhu St., Suzhou Industrial Park
215123 Jiangsu Prov.
China
P  +49 69 130277-70
F  +49 69 130277-75

As the new generation of warming technology, we introduce our first series of intelligent textiles: j-NOVA intelligent warming textiles.

The intelligent textiles are based on complex nano-technology, and maintain a constant temperature whilst preserving a low energy conversion rate. The technology can achieve an efficiency level of up to 90%, depending on its power source.

The combination of advanced nano material and intelligent modules bring warmth from the fabric and garment itself, which can be scrunched up or washed without affecting its function.

j-NOVA.WORKS aims to balance technology with tradition, and to improve the relationship between nature and humans.

Acanthurus GmbH is the sole European Distributor.

So, j-NOVA is the company with the nanotechnology and Acanthurus represents their interests in Europe. I wish I could find out more about the technology but this is the best I’ve been able to accomplish in the time I have available.

Little black graphene dress

Graphene Dress. Courtesy: intu

I don’t think there are many women who can carry off this garment. Of course that’s not the point as the dress is designed to show off its technical capabilities. A Jan. 31, 2017 news item on Nanowerk announces the little black graphene dress (lbgd?),

Science and fashion have been brought together to create the world’s most technically advanced dress, the intu Little Black Graphene Dress.

The new prototype garment showcases the future uses of the revolutionary, Nobel Prize winning material graphene and incorporating it into fashion for the first time, in the ultimate wearable tech statement garment.

A Jan. 25, 2017 National Graphene Institute at University of Manchester press release, which originated the news item, expands on the theme,

The project between intu Trafford Centre, renowned wearable tech company Cute Circuit which has made dresses for the likes of Katy Perry and Nicole Scherzinger and the National Graphene Institute at The University of Manchester, uses graphene in a number of innovative ways to create the world’s most high tech LBD – highlighting the material’s incredible properties.

The dress is complete with a graphene sensor which captures the rate in which the wearer is breathing via a contracting graphene band around the models waist, the micro LED which is featured across the bust on translucent conductive graphene responds to the sensor making the LED flash and changing colour depending on breathing rate. It marks a major step in the future uses of graphene in fashion where it is hoped the highly conductive transparent material could be used to create designs which act as screens showcasing digital imagery which could be programmed to change and updated by the wearer meaning one garment could be in any colour hue or design.

The 3D printed graphene filament shows the intricate structural detail of graphene in raised diamond shaped patterns and showcases graphene’s unrivalled conductivity with flashing LED lights.

The high tech LBD can be controlled by The Q app created by Cute Circuit to change the way the garment illuminates.

The dress was created by the Manchester shopping centre to celebrate Manchester’s crown as the European City of Science. The dress will then be on display at intu Trafford Centre, it will then be available for museums and galleries to loan for fashion displays.

Richard Paxton, general manager at intu Trafford Centre said: “We have a real passion for fashion and fashion firsts, this dress is a celebration of Manchester, its amazing love for innovation and textiles, showcasing this new wonder material in a truly unique and exciting way. It really is the world’s most high-tech dress featuring the most advanced super-material and something intu is very proud to have created in collaboration with Cute Circuit and the National Graphene Institute. Hopefully this project inspires more people to experiment with graphene and its wide range of uses.”

Francesca Rosella, Chief Creative Director for Cute Circuit said: “This was such an exciting project for us to get involved in, graphene has never been used in the fashion industry and being the first to use it was a real honour allowing us to have a lot of fun creating the stunning intu Little Black Graphene Dress, and showcasing graphene’s amazing properties.”

Dr Paul Wiper, Research Associate, National Graphene Institute said: “This is a fantastic project, graphene is still very much at its infancy for real-world applications and showcasing its amazing properties through the forum of fashion is very exciting. The dress is truly a one of a kind and shows what creativity, imagination and a desire to innovate can create using graphene and related two-dimensional materials.”

The dress is modelled by Britain’s Next Top Model finalist Bethan Sowerby who is from Manchester and used to work at intu Trafford Centre’s Top Shop.

Probably not coming soon to a store near you.

A dress that lights up according to reactions on Twitter

I don’t usually have an opportunity to write about red carpet events but the recent Met Gala, also known as the Costume Institute Gala and the Met Ball, which took place on the evening of May 2, 2016 in New York, featured a ‘cognitive’ dress. Here’s more from a May 2, 2016 article by Emma Spedding for The Telegraph (UK),

“Tech white tie” was the dress code for last night’s Met Gala, inspired by the theme of this year’s Met fashion exhibition, ‘Manus x Machina: Fashion in the Age of Technology’. While many of the a-list attendees interpreted this to mean ‘silver sequins’, several rose to the challenge with beautiful, future-gazing gowns which give a glimpse of how our clothes might behave in the future.

Supermodel Karolina Kurkova wore a ‘cognitive’ Marchesa gown that was created in collaboration with technology company IBM. The two companies came together following a survey conducted by IBM which found that Marchesa was one of the favourite designers of its employees. The dress is created using a conductive fabric chosen from 40,000 options and embedded with 150 LED lights which change colour in reaction to the sentiments of Kurkova’s Twitter followers.

A May 2, 2016 article by Rose Pastore for Fast Company provides a little more technical detail and some insight into why Marchesa partnered with IBM,

At the Met Gala in Manhattan tonight [May 2, 2016], one model will be wearing a “cognitive dress”: A gown, designed by fashion house Marchesa, that will shift in color based on input from IBM’s Watson supercomputer. The dress features gauzy white roses, each embedded with an LED that will display different colors depending on the general sentiment of tweets about the Met Gala. The algorithm powering the dress relies on Watson Color Theory, which links emotions to colors, and on the Watson Tone Analyzer, a service that can detect emotion in text.

In addition to the color-changing cognitive dress, Marchesa designers are using Watson to get new color palette ideas. The designers choose from a list of emotions and concepts—things like romance, excitement, and power—and Watson recommends a palette of colors it associates with those sentiments.

An April 29, 2016 posting by Ann Rubin for IBM’s Think blog discusses the history of technology/art partnerships and provides more technical detail (yes!) about this one,

Throughout history, we’ve seen traces of technology enabling humans to create – from Da Vinci’s use of the camera obscura to Caravaggio’s work with mirrors and lenses. Today, cognitive systems like Watson are giving artists, designers and creative minds the tools to make sense of the world in ground-breaking ways, opening up new avenues for humans to approach creative thinking.

The dress’ cognitive creation relies on a mix of Watson APIs, cognitive tools from IBM Research, solutions from Watson developer partner Inno360 and the creative vision from the Marchesa design team. In advance of it making its exciting debut on the red carpet, we’d like to take you on the journey of how man and machine collaborated to create this special dress.

Rooted in the belief that color and images can indicate moods and send messages, Marchesa first selected five key human emotions – joy, passion, excitement, encouragement and curiosity – that they wanted the dress to convey. IBM Research then fed this data into the cognitive color design tool, a groundbreaking project out of IBM Research-Yorktown that understands the psychological effects of colors, the interrelationships between emotions, and image aesthetics.

This process also involved feeding Watson hundreds of images associated with Marchesa dresses in order to understand and learn the brand’s color palette. Ultimately, Watson was able to suggest color palettes that were in line with Marchesa’s brand and the identified emotions, which will come to life on the dress during the Met Gala.

Once the colors were finalized, Marchesa turned to IBM partner Inno360 to source a fabric for their creation. Using Inno360’s R&D platform – powered by a combination of seven Watson services – the team searched more than 40,000 sources for fabric information, narrowing down to 150 sources of the most useful options to consider for the dress.

From this selection, Inno360 worked in partnership with IBM Research-Almaden to identify printed and woven textiles that would respond well to the LED technology needed to execute the final part of the collaboration. Inno360 was then able to deliver 35 unique fabric recommendations based on a variety of criteria important to Marchesa, like weight, luminosity, and flexibility. From there, Marchesa weighed the benefits of different material compositions, weights and qualities to select the final fabric that suited the criteria for their dress and remained true to their brand.

Here’s what the dress looks like,

Courtesy of Marchesa Facebook page {https://www.facebook.com/MarchesaFashion/)

Courtesy of Marchesa Facebook page {https://www.facebook.com/MarchesaFashion/)

Watson is an artificial intelligence program,which I have written about a few times but I think this Feb. 28, 2011 posting (scroll down about 50% of the way), which mentions Watson, product placement, Jeopardy (tv quiz show), and medical diagnoses seems the most à propos given IBM’s latest product placement at the Met Gala.

Not the only ‘tech’ dress

There was at least one other ‘tech’ dress at the 2016 Met Gala, this one designed by Zac Posen and worn by Claire Danes. It did not receive a stellar review in a May 3, 2016 posting by Elaine Lui on Laineygossip.com,

People are losing their goddamn minds over this dress, by Zac Posen. Because it lights up.

It’s bullsh-t.

This is a BULLSH-T DRESS.

It’s Cinderella with a lamp shoved underneath her skirt.

Here’s a video of Danes and her dress at the Met Gala,

A Sept. 10, 2015 news item in People magazine indicates that Posen’s a different version of a ‘tech’ dress was a collaboration with Google (Note: Links have been removed),

Designer Zac Posen lit up his 2015 New York Fashion Week kickoff show on Tuesday by debuting a gorgeous and tech-savvy coded LED dress that blinked in different, dazzling pre-programmed patterns down the runway.

In coordination with Google’s non-profit organization, Made with Code, which inspires girls to pursue careers in tech coding, Posen teamed up with 30 girls (all between the ages of 13 and 18), who attended the show, to introduce the flashy dress — which was designed by Posen and coded by the young women.

“This is the future of the industry: mixing craft, fashion and technology,” the 34-year-old designer told PEOPLE. “There’s a discrepancy in the coding field, hardly any women are at the forefront, and that’s a real shame. If we can entice young women through the allure of fashion, to get them learning this language, why not?”

..

Through a micro controller, the gown displays coded patterns in 500 LED lights that are set to match the blues and yellows of Posen’s new collection. The circuit was designed and physically built into Posen’s dress fabric by 22-year-old up-and-coming fashion designer and computer science enthusiast, Maddy Maxey, who tells PEOPLE she was nervous watching Rocha [model Coco Rocha] make her way down the catwalk.

“It’s exactly as if she was carrying a microwave down the runway,” Maxey said. “It’s an entire circuit on a textile, so if one connection had come lose, the dress wouldn’t have worked. But, it did! And it was so deeply rewarding.”

Other ‘tech’ dresses

Back in 2009 I attended that year’s International Symposium on Electronic Arts and heard Clive van Heerden of Royal Philips Electronics talk about a number of innovative concepts including a ‘mood’ dress that would reveal the wearer’s emotions to whomever should glance their way. It was not a popular concept especially not in Japan where it was first tested.

The symposium also featured Maurits Waldemeyer who worked with fashion designer Chalayan Hussein and LED dresses and dresses that changed shape as the models went down the runway.

In 2010 there was a flurry of media interest in mood changing ‘smart’ clothes designed by researchers at Concordia University (Barbara Layne, Canada) and Goldsmiths College (Janis Jefferies, UK). Here’s more from a June 4, 2010 BBC news online item,

The clothes are connected to a database that analyses the data to work out a person’s emotional state.

Media, including songs, words and images, are then piped to the display and speakers in the clothes to calm a wearer or offer support.

Created as part of an artistic project called Wearable Absence the clothes are made from textiles woven with different sorts of wireless sensors. These can track a wide variety of tell-tale biological markers including temperature, heart rate, breathing and galvanic skin response.

Final comments

I don’t have anything grand to say. It is interesting to see the progression of ‘tech’ dresses from avant garde designers and academics to haute couture.

Speed of commercializing fashion technology in the 19th century

It took our 19th century ancestors four years to commercialize a new purple dye. While this is not a nanotechnology story as such, it’s a fascinating fashion story that also focuses on commercialization (a newly urgent aspect of the nanotechnology effort). From a Dec. 1, 2015 Elsevier press release on EurekAlert,

The dye industry of the 19th century was fast-moving and international, according to a state-of-the-art analysis of four purple dresses. The study, published in Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy, reveals that a brand new purple dye went from first synthesis to commercial use in just a few years.

Before the 1800s, purple dye came at a premium, so it was usually restricted to royalty — hence the connection between royals and purple. The 19th century saw the discovery of several synthetic purple dyes, making purple textiles more affordable and readily available. Understanding where these dyes came from and were used is therefore of historical interest.

In the new study, researchers from CSIRO Manufacturing and the National Gallery of Victoria in Australia show that the new purple dyes were part of a fast-moving industry, going from first synthesis to commercial use in as few as four years. This reflects how dynamic the fashion industry must have been at the time.

“Chemical analysis has given us a glimpse into the state of the dye industry in the 19th century, revealing the actual use of dyes around the world,” said Dr. Jeffrey Church, one of the authors of the study and principal research scientist at CSIRO Manufacturing.

The researchers took small samples of fibers from four dresses: three 19th century English dresses and one Australian wedding gown. They extracted the dyes from very small silk yarn samples and analyzed them using a combination of chemical techniques: thin layer chromatography and surface enhanced Raman spectroscopy, Fourier transform infrared spectroscopy and energy dispersive x-ray spectroscopy.

They found that the three English dresses were dyed using methyl violet; one of them was made only four years after the dye was first synthesized.

“The dress containing methyl violet was made shortly after the initial synthesis of the dye, indicating the rapidity with which the new synthetic dyes were embraced by the textile dye trade and the fashion world of the day,” commented Dr. Church.

However, the Australian wedding dress incorporated the use of a different dye — Perkin’s mauve — which was very historically significant, as it was the first synthetic purple dye and was only produced for 10 years. This was a surprise to the researchers, as the dress was made 20 years after the dye had been replaced on the market.

“The dress in question was made in Australia,” explained Dr. Church. “Does the presence of Perkin’s mauve relate to trade delays between Europe and Australia? Or was this precious fabric woven decades earlier and kept for the special purpose of a wedding? This is an excellent example of how state-of-the-art science and technology can shed light on the lives and times of previous generations. In doing so, as is common in science, one often raises more questions.”

The researchers have provided an image of the dresses,

Fig. 1. Dress 1 circa 1865, dress 2 circa 1898, dress 3 circa 1878 and dress 4 circa 1885 (clock-wise from left top). Details of these dresses are presented in the Experimental section. [downloaded from http://www.sciencedirect.com/science/article/pii/S1386142515302742]

Fig. 1. Dress 1 circa 1865, dress 2 circa 1898, dress 3 circa 1878 and dress 4 circa 1885 (clock-wise from left top). Details of these dresses are presented in the Experimental section. [downloaded from http://www.sciencedirect.com/science/article/pii/S1386142515302742]

Can you guess which one is the wedding dress? I was wrong. To find out more about the research and the dresses, here’s a link and a citation,

The purple coloration of four late 19th century silk dresses: A spectroscopic investigation by Andrea L. Woodhead, Bronwyn Cosgrove, Jeffrey S. Church. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy Volume 154, 5 February 2016, Pages 185–192  doi:10.1016/j.saa.2015.10.024

This paper appears to be open access. It’s quite interesting as they trace the history of purple dyes back to ancient times before fast forwarding to the 19th Century.

Solid gold smoke?

Aerogels seem to enchant even scientists who sometimes call it ‘solid smoke’ (my Aug. 20, 2012 posting). This latest aerogel is made of gold according to a Nov. 25, 2015 news item on Nanowerk,

 A nugget of real 20 carats gold, so light that it does not sink in a cappuccino, floating instead on the milk foam – what sounds unbelievable has actually been accomplished by researchers from ETH Zurich. Scientists led by Raffaele Mezzenga, Professor of Food and Soft Materials, have produced a new kind of foam out of gold, a three-dimensional mesh of gold that consists mostly of pores. It is the lightest gold nugget ever created. “The so-called aerogel is a thousand times lighter than conventional gold alloys. It is lighter than water and almost as light as air,” says Mezzenga.

A Nov. 25, 2015 ETH Zurich press release (also on EurekAlert), which originated the news item, provides more information about the ‘gold smoke’,

The new gold form can hardly be differentiated from conventional gold with the naked eye – the aerogel even has a metallic shine. But in contrast to its conventional form, it is soft and malleable by hand. It consists of 98 parts air and only two parts of solid material. Of this solid material, more than four-fifths are gold and less than one-fifth is milk protein fibrils. This corresponds to around 20 carat gold.

Here’s what it looks like,

Caption: Even when it seems unbelievable: these are genuine photographs, in which nothing has been faked. E.g. the 20 carats gold foam is lighter than milk foam. Credit: Gustav Nyström and Raffaele Mezzenga / (copyright) ETH Zurich

Caption: Even when it seems unbelievable: these are genuine photographs, in which nothing has been faked. E.g. the 20 carats gold foam is lighter than milk foam.
Credit: Gustav Nyström and Raffaele Mezzenga / (copyright) ETH Zurich

The press release provides more technical details,

The scientists created the porous material by first heating milk proteins to produce nanometre-fine protein fibres, so-called amyloid fibrils, which they then placed in a solution of gold salt. The protein fibres interlaced themselves into a basic structure along which the gold simultaneously crystallised into small particles. This resulted in a gel-like gold fibre network.

“One of the big challenges was how to dry this fine network without destroying it,” explains Gustav Nyström, postdoc in Mezzenga’s group and first author of the corresponding study in the journal Advanced Materials. As air drying could damage the fine gold structure, the scientists opted for a gentle and laborious drying process using carbon dioxide. They did so in an interdisciplinary effort assisted by researchers in the group of Marco Mazzotti, Professor of Process Engineering.

Dark-red gold

The method chosen, in which the gold particles are crystallised directly during manufacture of the aerogel protein structure (and not, for example, added to an existing scaffold) is new. The method’s biggest advantage is that it makes it easy to obtain a homogeneous gold aerogel, perfectly mimicking gold alloys.

The manufacturing technique also offers scientists numerous possibilities to deliberately influence the properties of gold in a simple manner. ” The optical properties of gold depend strongly on the size and shape of the gold particles,” says Nyström. “Therefore we can even change the colour of the material. When we change the reaction conditions in order that the gold doesn’t crystallise into microparticles but rather smaller nanoparticles, it results in a dark-red gold.” By this means, the scientists can influence not only the colour, but also other optical properties such as absorption and reflection.

The new material could be used in many of the applications where gold is currently being used, says Mezzenga. The substance’s properties, including its lighter weight, smaller material requirement and porous structure, have their advantages. Applications in watches and jewellery are only one possibility. Another application demonstrated by the scientists is chemical catalysis: since the highly porous material has a huge surface, chemical reactions that depend on the presence of gold can be run in a very efficient manner. The material could also be used in applications where light is absorbed or reflected. Finally, the scientists have also shown how it becomes possible to manufacture pressure sensors with it. “At normal atmospheric pressure the individual gold particles in the material do not touch, and the gold aerogel does not conduct electricity,” explains Mezzenga. “But when the pressure is increased, the material gets compressed and the particles begin to touch, making the material conductive.”

Here’s a link to and a citation for the paper,

Amyloid Templated Gold Aerogels by Gustav Nyström, Maria P. Fernandez-Ronco, Sreenath Bolisetty, Marco Mazzotti, Raffaele Mezzenaga. Advanced Materials DOI: 10.1002/adma.201503465 First published: 23 November 2015

This paper is behind a paywall.

Shape memory in a supercapacitor fibre for ‘smart’ textiles (wearable tech: 1 of 3)

Wearable technology seems to be quite trendy for a grouping not usually seen: consumers, fashion designers, medical personnel, manufacturers, and scientists.

The first in this informal series concerns a fibre with memory shape. From a Nov. 19, 2015 news item on Nanowerk (Note: A link has been removed),

Wearing your mobile phone display on your jacket sleeve or an EKG probe in your sports kit are not off in some distant imagined future. Wearable “electronic textiles” are on the way. In the journal Angewandte Chemie (“A Shape-Memory Supercapacitor Fiber”), Chinese researchers have now introduced a new type of fiber-shaped supercapacitor for energy-storage textiles. Thanks to their shape memory, these textiles could potentially adapt to different body types: shapes formed by stretching and bending remain “frozen”, but can be returned to their original form or reshaped as desired.

A Nov. 19, 2015 Wiley Publishers press release, which originated the news item, provides context and detail about the work,

Any electronic components designed to be integrated into textiles must be stretchable and bendable. This is also true of the supercapacitors that are frequently used for data preservation in static storage systems (SRAM). SRAM is a type of storage that holds a small amount of data that is rapidly retrievable. It is often used for caches in processors or local storage on chips in devices whose data must be stored for long periods without a constant power supply. Some time ago, a team headed by Huisheng Peng at Fudan University developed stretchable, pliable fiber-shaped supercapacitors for integration into electronic textiles. Peng and his co-workers have now made further progress: supercapacitor fibers with shape memory.

Any electronic components designed to be integrated into textiles must be stretchable and bendable. This is also true of the supercapacitors that are frequently used for data preservation in static storage systems (SRAM). SRAM is a type of storage that holds a small amount of data that is rapidly retrievable. It is often used for caches in processors or local storage on chips in devices whose data must be stored for long periods without a constant power supply.
Some time ago, a team headed by Huisheng Peng at Fudan University developed stretchable, pliable fiber-shaped supercapacitors for integration into electronic textiles. Peng and his co-workers have now made further progress: supercapacitor fibers with shape memory.

The fibers are made using a core of polyurethane fiber with shape memory. This fiber is wrapped with a thin layer of parallel carbon nanotubes like a sheet of paper. This is followed by a coating of electrolyte gel, a second sheet of carbon nanotubes, and a final layer of electrolyte gel. The two layers of carbon nanotubes act as electrodes for the supercapacitor. Above a certain temperature, the fibers produced in this process can be bent as desired and stretched to twice their original length. The new shape can be “frozen” by cooling. Reheating allows the fibers to return to their original shape and size, after which they can be reshaped again. The electrochemical performance is fully maintained through all shape changes.

Weaving the fibers into tissues results in “smart” textiles that could be tailored to fit the bodies of different people. This could be used to make precisely fitted but reusable electronic monitoring systems for patients in hospitals, for example. The perfect fit should render them both more comfortable and more reliable.

Here’s a link to and a citation for the paper,

A Shape-Memory Supercapacitor Fiber by Jue Deng, Ye Zhang, Yang Zhao, Peining Chen, Dr. Xunliang Cheng, & Prof. Dr. Huisheng Peng. Angewandte Chemie International Edition  DOI: 10.1002/anie.201508293  First published: 3 November 2015

This paper is behind a paywall.