Tag Archives: University of California Riverside

The inside scoop on beetle exoskeletons

In the past I’ve covered work on the Namib beetle and its bumps which allow it to access condensation from the air in one of the hottest places on earth and work on jewel beetles and how their structural colo(u)r is derived. Now, there’s research into a beetle’s body armor from the University of Nebraska-Lincoln according to a Feb. 22, 2017 news item on ScienceDaily,

Beetles wear a body armor that should weigh them down — think medieval knights and turtles. In fact, those hard shells protecting delicate wings are surprisingly light, allowing even flight.

Better understanding the structure and properties of beetle exoskeletons could help scientists engineer lighter, stronger materials. Such materials could, for example, reduce gas-guzzling drag in vehicles and airplanes and reduce the weight of armor, lightening the load for the 21st-century knight.

But revealing exoskeleton architecture at the nanoscale has proven difficult. Nebraska’s Ruiguo Yang, assistant professor of mechanical and materials engineering, and his colleagues found a way to analyze the fibrous nanostructure. …

A Feb. 22, 2017 University of Nebraska-Lincoln news release by Gillian Klucas (also on EurekAlert), which originated the news item, describes skeletons and the work in more detail,

The lightweight exoskeleton is composed of chitin fibers just around 20 nanometers in diameter (a human hair measures approximately 75,000 nanometers in diameter) and packed and piled into layers that twist in a spiral, like a spiral staircase. The small diameter and helical twisting, known as Bouligand, make the structure difficult to analyze.

Yang and his team developed a method of slicing down the spiral to reveal a surface of cross-sections of fibers at different orientations. From that viewpoint, the researchers were able to analyze the fibers’ mechanical properties with the aid of an atomic force microscope. This type of microscope applies a tiny force to a test sample, deforms the sample and monitors the sample’s response. Combining the experimental procedure and theoretical analysis, the researchers were able to reveal the nanoscale architecture of the exoskeleton and the material properties of the nanofibers.

Yang holds a piece of the atomic force microscope used to measure the beetle's surface. A small wire can barely be seen in the middle of the piece. Unseen is a two-nano-size probe attached to the wire, which does the actual measuring.

Craig Chandler | University Communication

Yang holds a piece of the atomic force microscope used to measure the beetle’s surface. A small wire can barely be seen in the middle of the piece. Unseen is a two-nano-size probe attached to the wire, which does the actual measuring.

They made their discoveries in the common figeater beetle, Cotinis mutabilis, a metallic green native of the western United States. But the technique can be used on other beetles and hard-shelled creatures and might also extend to artificial materials with fibrous structures, Yang said.

Comparing beetles with differing demands on their exoskeletons, such as defending against predators or environmental damage, could lead to evolutionary insights as well as a better understanding of the relationship between structural features and their properties.

Yang’s co-authors are Alireza Zaheri and Horacio Espinosa of Northwestern University; Wei Gao of the University of Texas at San Antonio; and Cheryl Hayashi of the University of California, Riverside.

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

Exoskeletons: AFM Identification of Beetle Exocuticle: Bouligand Structure and Nanofiber Anisotropic Elastic Properties by Ruiguo Yang, Alireza Zaheri,Wei Gao, Charely Hayashi, Horacio D. Espinosa. Adv. Funct. Mater. vol. 27 (6) 2017 DOI: 10.1002/adfm.201770031 First published: 8 February 2017

This paper is behind a paywall.

Charging portable electronics in 10 minutes (hopefully) with a 3D (silicon-decorated) carbon nanotube cluster

I sometimes think there’s a worldwide obsession with lithium-ion batteries as hardly a day passes without at least one story about them. To honour that obsession, here’s a June 11, 2014 news item on Azonano describing a new technique which could lead to a faster charging time for mobile electronics,

Researchers at the University of California, Riverside [UCR] Bourns College of Engineering have developed a three-dimensional, silicon-decorated, cone-shaped carbon-nanotube cluster architecture for lithium ion battery anodes that could enable charging of portable electronics in 10 minutes, instead of hours.

A June 10, 2014 UCR news release by Sean Nealon, which originated the news item, notes the ubiquity of lithium-ion batteries in modern electronics and explains why silicon was used in this research,

Lithium ion batteries are the rechargeable battery of choice for portable electronic devices and electric vehicles. But, they present problems. Batteries in electric vehicles are responsible for a significant portion of the vehicle mass. And the size of batteries in portable electronics limits the trend of down-sizing.

Silicon is a type of anode material that is receiving a lot of attention because its total charge capacity is 10 times higher than commercial graphite based lithium ion battery anodes. Consider a packaged battery full-cell. Replacing the commonly used graphite anode with silicon anodes will potentially result in a 63 percent increase of total cell capacity and a battery that is 40 percent lighter and smaller.

The news release then provides a very brief description of the technology,

…, UC Riverside researchers developed a novel structure of three-dimensional silicon decorated cone-shaped carbon nanotube clusters architecture via chemical vapor deposition and inductively coupled plasma treatment.

Lithium ion batteries based on this novel architecture demonstrate a high reversible capacity and excellent cycling stability. The architecture demonstrates excellent electrochemical stability and irreversibility even at high charge and discharge rates, nearly 16 times faster than conventionally used graphite based anodes.

The researchers believe the ultrafast rate of charge and discharge can be attributed to two reasons, said Wei Wang, lead author of the paper.

One, the seamless connection between graphene covered copper foil and carbon nanotubes enhances the active material-current collector contact integrity which facilitates charge and thermal transfer in the electrode system.

Two, the cone-shaped architecture offers small interpenetrating channels for faster electrolyte access into the electrode which may enhance the rate performance.

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

Silicon Decorated Cone Shaped Carbon Nanotube Clusters for Lithium Ion Battery Anodes by Wei Wang, Isaac Ruiz, Kazi Ahmed, Hamed Hosseini Bay, Aaron S. George, Johnny Wang, John Butler, Mihrimah Ozkan, and Cengiz S. Ozkan. Small DOI: 10.1002/smll.201400088 Article first published online: 19 APR 2014

© 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

This paper is behind a paywall.

An entire chemistry lab (nanofactory) in a droplet

I love the blue in this image, which illustrates the thousand-droplets test, research suggesting the possibility of a nanofactory or laboratory within a droplet ,

Droplets with a diameter of only a few micrometers act as the reaction vessels for a complex oscillating reaction - Photo: Maximilian Weitz / TUM

Droplets with a diameter of only a few micrometers act as the reaction vessels for a complex oscillating reaction – Photo: Maximilian Weitz / TUM

A Feb. 19, 2014 news item on Azonano reveals more,

An almost infinite number of complex and interlinked reactions take place in a biological cell. In order to be able to better investigate these networks, scientists led by Professor Friedrich Simmel, Chair of Systems Biophysics and Nano Biophysics at the Technische Universitaet Muenchen (TUM) try to replicate them with the necessary components in a kind of artificial cell.

This is also motivated by the thought of one day using such single-cell systems for example as “nanofactories” for the production of complex organic substances or biomaterials.

All such experiments have so far predominantly worked with very simple reactions, however. NIM Professor Friedrich Simmel and his team have now for the first time managed to let a more complex biochemical reaction take place in tiny droplets of only a few micrometers in size. Together with co-authors from the University of California Riverside and the California Institute of Technology in Pasadena, USA, the scientists are presenting their findings in the current edition of Nature Chemistry.

The Feb. 18, 2014 TUM press release, which originated the news item, details the experiements,

Shaking once – investigating thousands of times

The experiment is conducted by putting an aqueous reaction solution into oil and shaking the mixture vigorously. The result is an emulsion consisting of thousands of droplets. Employing only a tiny amount of material, the scientists have thus found a cost-efficient and quick way of setting up an extremely large number of experiments simultaneously.

As a test system, the researchers chose a so-called biochemical oscillator. This involves several reactions with DNA and RNA, which take place repetitively one after the other. Their rhythm becomes visible because in one step two DNA strands bind to each other in such a way that a fluorescent dye shines. This regular blinking is then recorded with special cameras.

Small droplets – huge differences

In the first instance, Friedrich Simmel and his colleagues intended to investigate the principal behavior of a complex reaction system if scaled down to the size of a cell. In addition, they specifically wondered if all droplet systems displayed an identical behavior and what factors would cause possible differences.

Their experiments showed that the oscillations in the individual droplets differed strongly, that is to say, much stronger than might have been expected from a simple statistical model. It was above all evident that small drops display stronger variations than large ones. “It is indeed surprising that we could witness a similar variability and individuality in a comparatively simple chemical system as is known from biological cells”, explains Friedrich Simmel the results.

Thus, it is currently not possible to realize systems which are absolutely identical. This de facto means that researchers have to either search for ways to correct these variations or factor them in from the start. On the other hand, the numerous slightly differing systems could also be used specifically to pick out the one desired, optimally running set-up from thousands of systems.

Investigating complex biosynthetic systems in artificial cells opens up many other questions, as well. In a next step, Friedrich Simmel plans to address the underlying theoretical models: “The highly parallel recording of the emulsion droplets enabled us to acquire plenty of interesting data. Our goal is to use these data to review and improve the theoretical models of biochemical reaction networks at small molecule numbers.”

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

Diversity in the dynamical behaviour of a compartmentalized programmable biochemical oscillator by Maximilian Weitz, Jongmin Kim, Korbinian Kapsner, Erik Winfree, Elisa Franco, & Friedrich C. Simmel. Nature Chemistry (2014) doi:10.1038/nchem.1869 Published online 16 February 2014

This paper is behind a paywall.

Resistive memory from University of California Riverside (replacing flash memory in mobile devices) and Boise State University (neuron chips)

Today, (Aug. 19, 2 013)I have two items on memristors. First, Dexter Johnson provides some context for understanding why a University of California Riverside research team’s approach to creating memristors is exciting some interest in his Aug. 17, 2013 posting (Nanoclast blog on the IEEE [Institute of Electrical and Electronics Engineers] website), Note: Links have been removed,

The heralding of the memristor, or resistive memory, and the long-anticipated demise of flash memory have both been tracking on opposite trajectories with resistive memory expected to displace flash ever since the memristor was first discovered by Stanley Williams’ group at Hewlett Packard in 2008.

The memristor has been on a rapid development track ever since and has been promised to be commercially available as early as 2014, enabling 10 times greater embedded memory for mobile devices than currently available.

The obsolescence of flash memory at the hands of the latest nanotechnology has been predicted for longer than the commercial introduction of the memristor. But just at the moment it appears it’s going to reach its limits in storage capacity along comes a new way to push its capabilities to new heights, sometimes thanks to a nanomaterial like graphene.

In addition to the graphene promise, Dexter goes on to discuss another development,  which could push memory capabilities and which is mentioned in an Aug. 14, 2013 news item on ScienceDaily (and elsewhere),

A team at the University of California, Riverside Bourns College of Engineering has developed a novel way to build what many see as the next generation memory storage devices for portable electronic devices including smart phones, tablets, laptops and digital cameras.

The device is based on the principles of resistive memory [memristor], which can be used to create memory cells that are smaller, operate at a higher speed and offer more storage capacity than flash memory cells, the current industry standard. Terabytes, not gigbytes, will be the norm with resistive memory.

The key advancement in the UC Riverside research is the creation of a zinc oxide nano-island on silicon. It eliminates the need for a second element called a selector device, which is often a diode.

The Aug. 13, 2013 University of California Riverside news release by Sean Nealon, which originated the news item, further describes the limitations of flash memory and reinforces the importance of being able to eliminate a component (selector device),

Flash memory has been the standard in the electronics industry for decades. But, as flash continues to get smaller and users want higher storage capacity, it appears to reaching the end of its lifespan, Liu [Jianlin Liu, a professor of electrical engineering] said.

With that in mind, resistive memory is receiving significant attention from academia and the electronics industry because it has a simple structure, high-density integration, fast operation and long endurance.

Researchers have also found that resistive memory can be scaled down in the sub 10-nanometer scale. (A nanometer is one-billionth of a meter.) Current flash memory devices are roughly using a feature size twice as large.

Resistive memory usually has a metal-oxide-metal structure in connection with a selector device. The UC Riverside team has demonstrated a novel alternative way by forming self-assembled zinc oxide nano-islands on silicon. Using a conductive atomic force microscope, the researchers observed three operation modes from the same device structure, essentially eliminating the need for a separate selector device.

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

Multimode Resistive Switching in Single ZnO Nanoisland System by Jing Qi, Mario Olmedo, Jian-Guo Zheng, & Jianlin Liu. Scientific Reports 3, Article number: 2405 doi:10.1038/srep02405 Published 12 August 2013

This study is open access.

Meanwhile, Boise State University (Idaho, US) is celebrating a new project, CIF: Small: Realizing Chip-scale Bio-inspired Spiking Neural Networks with Monolithically Integrated Nano-scale Memristors, which was announced in an Aug. 17, 2013 news item on Azonano,

Electrical and computer engineering faculty Elisa Barney Smith, Kris Campbell and Vishal Saxena are joining forces on a project titled “CIF: Small: Realizing Chip-scale Bio-inspired Spiking Neural Networks with Monolithically Integrated Nano-scale Memristors.”

Team members are experts in machine learning (artificial intelligence), integrated circuit design and memristor devices. Funded by a three-year, $500,000 National Science Foundation grant, they have taken on the challenge of developing a new kind of computing architecture that works more like a brain than a traditional digital computer.

“By mimicking the brain’s billions of interconnections and pattern recognition capabilities, we may ultimately introduce a new paradigm in speed and power, and potentially enable systems that include the ability to learn, adapt and respond to their environment,” said Barney Smith, who is the principal investigator on the grant.

The Aug. 14, 2013 Boise State University news release by Kathleen Tuck, which originated the news item, describes the team’s focus on mimicking the brain’s capabilities ,

One of the first memristors was built in Campbell’s Boise State lab, which has the distinction of being one of only five or six labs worldwide that are up to the task.

The team’s research builds on recent work from scientists who have derived mathematical algorithms to explain the electrical interaction between brain synapses and neurons.

“By employing these models in combination with a new device technology that exhibits similar electrical response to the neural synapses, we will design entirely new computing chips that mimic how the brain processes information,” said Barney Smith.

Even better, these new chips will consume power at an order of magnitude lower than current computing processors, despite the fact that they match existing chips in physical dimensions. This will open the door for ultra low-power electronics intended for applications with scarce energy resources, such as in space, environmental sensors or biomedical implants.

Once the team has successfully built an artificial neural network, they will look to engage neurobiologists in parallel to what they are doing now. A proposal for that could be written in the coming year.

Barney Smith said they hope to send the first of the new neuron chips out for fabrication within weeks.

With the possibility that HP Labs will make its ‘memristor chips‘ commercially available in 2014 and neuron chips fabricated for the Boise State University researchers within weeks of this Aug. 19, 2013 date, it seems that memristors have been developed at a lightning fast pace. It’s been a fascinating process to observe.

The importance of science fiction for the future

I started this post in March (2013) but haven’t had time till now (May 7, 2013) to flesh it out. It was a Mar. 28, 2013 posting by Jessica Bland and Lydia Nicholas for the UK Guardian science blogs which inspired me (Note: Links have been removed),

Science fiction and real-world innovation have always fed off each other. The history of the electronic book shows us things are more complicated than fiction predicting fact [.]

Imagine a new future. No, not that tired old vision of hoverboards and robot butlers: something really new and truly strange. It’s hard. It’s harder still to invent the new things that will fill this entirely new world. New ideas that do not fit or that come from unfamiliar places are often ignored. Hedy Lemarr [a major movie sex symbol in her day] and George Antheil’s [musician] frequency-hopping patent was ignored for 20 years because the US Navy could not believe that Hollywood artists could invent a method of secure communication. Many of Nikola Tesla’s inventions and his passionate belief in the importance of renewable energy were ignored by a world that could not imagine a need for them.

Stories open our eyes to the opportunities and hazards of new technologies. By articulating our fears and desires for the future, stories help shape what is to come – informing public debate, influencing regulation and inspiring inventors. And this makes it important that we do not just listen to the loudest voices.

Of course it isn’t as simple as mining mountains of pulp sci-fi for the schematics of the next rocket or the algorithms of the next Google. Arthur C. Clarke, often attributed with the invention of the communication satellite, firmly believed that these satellites would require crews. The pervasive connectivity that defines our world today would never have existed if every satellite needed to be manned.

The Guardian posting was occasioned by the publication of two research papers produced for NESTA. It’s an organization which is not similar to any in Canada or the US (as far as I know). Here’s a little more about NESTA from their FAQs page,

Nesta is an independent charity with a mission to help people and organisations bring great ideas to life. We do this by providing investments and grants and mobilising research, networks and skills.

Nesta backs innovation to help bring great ideas to life. We do this by providing investments and grants and mobilising research, networks and skills.

Nesta receives funds from The Nesta Trust, which received the National Lottery endowment from the National Endowment for Science, Technology and the Arts.

The interest from this endowment is used to fund our activities. These activities must be used to promote the charitable objects of both the Nesta Trust and the Nesta charity. We also use the returns from Nesta investments, and income from working in partnership with others, to fund our work.

We don’t receive any ongoing general government funds to support our work.

On 1st April 2012 Nesta ceased being a Non-Departmental Public Body (NDPB) and became a charity (charity number 1144091).

We maintain our mission to carry out research into innovation and to further education, science, technology, the arts, public services, the voluntary sector and enterprise in various areas by encouraging and supporting innovation.

Nesta’s objectives are now set out in our ‘charitable objects’ which can be viewed here.

Nesta continues to operate at no cost to the Government or the taxpayer using return from the Nesta Trust.

In any event, NESTA commissioned two papers:

Imagining technology
Jon Turney
Nesta Working Paper 13/06
Issued: March 2013

Better Made Up: The Mutual Influence of Science fiction and Innovation
Caroline Bassett, Ed Steinmueller, Georgina Voss
Nesta Working Paper 13/07
Issued: March 2013

For anyone who does not have time to read the NESTA papers, the Guardian’s post by Bland and Nicholas provides a good overview of the thinking which links science fiction with real innovation.

Around the same time I stumbled across the Bland/Nicholas post I also stumbled on a science fiction conference that is regularly held at the University of California Riverside.

The Eaton Science Fiction Conference was held Apr. 11 – 14, 2013 and the theme was “Science Fiction Media. It’s a little late for this year but perhaps you want to start planning for next year.  Here’s the Eaton Science Fiction Conference website. For those who’d like to get a feel for this conference, here’s a little more from the Mar. 27, 2013 news release by Bettye Miller,

… the 2013 conference will be largest in the 34-year history of the conference, said Melissa Conway, head of Special Collections and Archives of the UCR Libraries and conference co-organizer. It also is the first time the UCR Libraries and College of Humanities, Arts and Social Sciences have partnered with the Science Fiction Research Association, the largest and most prestigious scholarly organization in the field, to present the event.

Among the science fiction writers who will be presenting on different panels are: Larry Niven, author of “Ringworld” and a five-time winner of the Hugo Award and a Nebula; Gregory Benford, astrophysicist and winner of a Nebula Award and a United Nations Medal in Literature; David Brin, astrophysicist and two-time winner of the Hugo Award; Audre Bormanis, writer/producer for “Star Trek: Enterprise,” “Threshold,” “Eleventh Hour,” “Legend of the Seeker” and “Tron: Uprising”; Kevin Grazier, science adviser for “Battlestar Galactica,” “Defiance,” “Eureka” and “Falling Skies”; and James Gunn, winner of a Hugo Award and the 2007 Damon Knight Memorial Grand Master, presented for lifetime achievement as a writer of science fiction and/or fantasy by the Science Fiction and Fantasy Writers of America.

As for the impetus for this conference in Riverside, California, from the news release,

UCR is the home of the Eaton Collection of Science Fiction and Fantasy, the largest publicly accessible collection of its kind in the world. The collection embraces every branch of science fiction, fantasy, horror and utopian/dystopian fiction.

The collection, which attracts scholars from around the world, holds more than 300,000 items including English-language science fiction, fantasy and horror published in the 20th century and a wide range of works in Spanish, French, Russian, Chinese, Japanese, German, and a dozen other languages; fanzines; comic books; anime; manga; science fiction films and television series; shooting scripts; archives of science fiction writers; and science fiction collectibles and memorabilia.

In one of those odd coincidences we all experience from time to time, Ray Harryhausen, creator of a type of stop-motion model animation known as Dynamation and well loved for his work in special effects and who was recognized with a life time achievement at the 2013 conference, died today (May 7, 2013; Wikipedia essay).

The item which moved me to publish today (May 7, 2013), Can Science Fiction Writers Inspire The World To Save Itself?, by Ariel Schwartz concerns the Hieroglyph project at Arizona State University,

Humanity’s lack of a positive vision for the future can be blamed in part on an engineering culture that’s more focused on incrementalism (and VC funding) than big ideas. But maybe science fiction writers should share some of the blame. That’s the idea that came out of a conversation in 2011 between science fiction author Neal Stephenson and Michael Crow, the president of Arizona State University.

If science fiction inspires scientists and engineers to create new things–Stephenson believes it can–then more visionary, realistic sci-fi stories can help create a better future. Hence the Hieroglyph experiment, launched this month as a collaborative website for researchers and writers. Many of the stories created on the platform will go into a HarperCollins anthology of fiction and non-fiction, set to be published in 2014.

Here’s more about the Hieroglyph project from the About page,

Inspiration is a small but essential part of innovation, and science fiction stories have been a seminal source of inspiration for innovators over many decades. In his article entitled “Innovation Starvation,” Neal Stephenson calls for a return to inspiration in contemporary science fiction. That call resonated with so many and so deeply that Project Hieroglyph was born shortly thereafter.

The name of Project Hieroglyph comes from the notion that certain iconic inventions in science fiction stories serve as modern “hieroglyphs” – Arthur Clarke’s communications satellite, Robert Heinlein’s rocket ship that lands on its fins, Issac Asimov’s robot, and so on. Jim Karkanias of Microsoft Research described hieroglyphs as simple, recognizable symbols on whose significance everyone agrees.

While the mission of Project Hieroglyph begins with creative inspiration, our hope is that many of us will be genuinely inspired towards realization.

This project is an initiative of Arizona State University’s Center for Science and Imagination.

It’s great seeing this confluence of thinking about science fiction, innovation, and science. I’m pretty sure we knew this in the 19th century (and probably before that too) and I just hope we don’t forget it again.

Nanoparticle emissions from electronic cigarettes

Electronic cigarettes may be safer but that doesn’t mean they’re 100% safe according to a Mar. 28, 2013 news item on Nanowerk (Note: Links removed),

Electronic cigarettes (EC) deliver aerosol by heating fluid containing nicotine. Cartomizer EC combine the fluid chamber and heating element in a single unit. Because EC do not burn tobacco, they may be safer than conventional cigarettes. Their use is rapidly increasing worldwide with little prior testing of their aerosol.

A new study led by Prue Talbot, Professor of Cell Biology at the University of California, Riverside, and Director, UCR Stem Cell Center and Stem Cell Core Facility, tested the hypothesis that EC aerosol contains metals derived from various components in EC (“Metal and Silicate Particles Including Nanoparticles Are Present in Electronic Cigarette Cartomizer Fluid and Aerosol”).

The article (open access) can be found here,

Citation: Williams M, Villarreal A, Bozhilov K, Lin S, Talbot P (2013) Metal and Silicate Particles Including Nanoparticles Are Present in Electronic Cigarette Cartomizer Fluid and Aerosol. PLoS ONE 8(3): e57987. doi:10.1371/journal.pone.0057987

Here’s a preview of the technical detail and the conclusion from the article’s abstract,

The filament, a nickel-chromium wire, was coupled to a thicker copper wire coated with silver. The silver coating was sometimes missing. Four tin solder joints attached the wires to each other and coupled the copper/silver wire to the air tube and mouthpiece. All cartomizers had evidence of use before packaging (burn spots on the fibers and electrophoretic movement of fluid in the fibers). Fibers in two cartomizers had green deposits that contained copper. Centrifugation of the fibers produced large pellets containing tin. Tin particles and tin whiskers were identified in cartridge fluid and outer fibers. Cartomizer fluid with tin particles was cytotoxic in assays using human pulmonary fibroblasts. The aerosol contained particles >1 µm comprised of tin, silver, iron, nickel, aluminum, and silicate and nanoparticles (<100 nm) of tin, chromium and nickel. The concentrations of nine of eleven elements in EC aerosol were higher than or equal to the corresponding concentrations in conventional cigarette smoke. Many of the elements identified in EC aerosol are known to cause respiratory distress and disease.

The presence of metal and silicate particles in cartomizer aerosol demonstrates the need for improved quality control in EC design and manufacture and studies on how EC aerosol impacts the health of users and bystanders.

I don’t know about anyone else but I’m going to be more careful about where I stand when my friends are smoking electronic cigarettes.

A ‘wandering meatloaf’ with teeth inspires nanomaterials for solar cells and Li-ion batteries

The ‘wandering meatloaf’ is a species of marine snail (or chiton) that has extraordinary teeth according to the Jan. 16, 2013 news item on ScienceDaily,

An assistant professor [David Kisailus] at the University of California, Riverside’s Bourns College of Engineering is using the teeth of a marine snail found off the coast of California to create less costly and more efficient nanoscale materials to improve solar cells and lithium-ion batteries.

The paper is focused on the gumboot chiton, the largest type of chiton, which can be up to a foot-long. They are found along the shores of the Pacific Ocean from central California to Alaska. They have a leathery upper skin, which is usually reddish-brown and occasionally orange, leading some to give it the nickname “wandering meatloaf.”

Over time, chitons have evolved to eat algae growing on and within rocks using a specialized rasping organ called a radula, a conveyer belt-like structure in the mouth that contains 70 to 80 parallel rows of teeth. During the feeding process, the first few rows of the teeth are used to grind rock to get to the algae. They become worn, but new teeth are continuously produced and enter the “wear zone” at the same rate as teeth are shed.

The University of California Riverside Jan. 15, 2013 news release by Sean Nealon, which originated the news item, describes the chiton’s teeth and the specifics of Kisailus’ inspiration (Note: A link has been removed),

Over time, chitons have evolved to eat algae growing on and within rocks using a specialized rasping organ called a radula, a conveyer belt-like structure in the mouth that contains 70 to 80 parallel rows of teeth. During the feeding process, the first few rows of the teeth are used to grind rock to get to the algae. They become worn, but new teeth are continuously produced and enter the “wear zone” at the same rate as teeth are shed.

Kisailus, who uses nature as inspiration to design next generation engineering products and materials, started studying chitons five years ago because he was interested in abrasion and impact-resistant materials. He has previously determined that the chiton teeth contain the hardest biomineral known on Earth, magnetite, which is the key mineral that not only makes the tooth hard, but also magnetic.

Kisailus is using the lessons learned from this biomineralization pathway as inspiration in his lab to guide the growth of minerals used in solar cells and lithium-ion [li-ion] batteries. By controlling the crystal size, shape and orientation of engineering nanomaterials, he believes he can build materials that will allow the solar cells and lithium-ion batteries to operate more efficiently. In other words, the solar cells will be able to capture a greater percentage of sunlight and convert it to electricity more efficiently and the lithium-ion batteries could need significantly less time to recharge.

Using the chiton teeth model has another advantage: engineering nanocrystals can be grown at significantly lower temperatures, which means significantly lower production costs.

While Kisailus is focused on solar cells and lithium-ion batteries, the same techniques could be used to develop everything from materials for car and airplane frames to abrasion resistant clothing. In addition, understanding the formation and properties of the chiton teeth could help to create better design parameters for better oil drills and dental drill bits.

Here’s a representation of the teeth from the University of California Riverside,

A series of images that show the teeth of the gumboot chiton (aka, snail, aka, wandering meatloaf)

A series of images that show the teeth of the gumboot chiton (aka, snail, aka, wandering meatloaf)

You can find other images and media materials in the ScienceDaily news item or the University of California Riverside news release. This citation and link for the research paper is from the ScienceDaily news item,

Qianqian Wang, Michiko Nemoto, Dongsheng Li, James C. Weaver, Brian Weden, John Stegemeier, Krassimir N. Bozhilov, Leslie R. Wood, Garrett W. Milliron, Christopher S. Kim, Elaine DiMasi, David Kisailus. Phase Transformations and Structural Developments in the Radular Teeth ofCryptochiton Stelleri. Advanced Functional Materials, 2013; DOI: 10.1002/adfm.201202894

This article is behind a paywall.