Tag Archives: NUS

Situating Science in Canada; excerpts from the Winter 2013 newsletter

Situating Science is a SSHRC (Social Science and Humanities Research Council) funded network for Canadian Science and Technology Studies (STS) and Philosophy and History of Science scholars amongst others who examine the social impacts of science both in the present and in the past. The network is in its seventh and final year of funding (sunsetting) although there are plans for the future as per its most recent newsletter. Here’s a brief description of Situating Science’s  recent activities along with a listing of activities taking place in various Canadian cities over the next several months, as well as, a hint about future plans, from the Winter 2013 newsletter,

Happy New Year!

It’s been a busy few months. Members of the Cluster are now able to present you with all the latest in this Winter 2013 newsletter. In this issue, the Social Sciences and Humanities Research Council of Canada’s Strategic Knowledge Cluster, Situating Science: Cluster for the Humanist and Social Study of Science (www.situsci.ca) is pleased to update you on activities …

Given our past successes, Cluster members plan to move forward with a few grant applications to sustain and initiate partnerships and activities. Some partners and stakeholders met in October to begin the planning process for a national and international partnership to explore sciences, technologies and their publics. They also plan to arrange to meet again this year to concretize plans for a sustainable network and national centre.

The Cluster hopes to build upon partnership activities with scholars and institutions in Southeast Asia and India. Members are currently planning to seek support for a Canada-Southeast Asia and India partnership to explore cosmopolitanism and circulation of knowledge.

The Cluster Centre and its many and varied local partners kept Dr. Evelyn Fox Keller busy during her 3.5 week fall visit to Halifax as the Cluster Visiting Scholar. Her time here allowed her to research genotypic plasticity, biological information and mathematical biology on top of participating in several activities, including a public lecture on “Paradigm Shifts and Revolutions in Contemporary Biology”. She then continued to Montreal to present and discuss her work at McGill [University] and UQAM [Université de Québec à Montréal] (CIRST) [Centre interuniversitaire de recherche sur la science et la technologie] and then to Toronto for discussions at York University, a University of Toronto IHPST [Institute for the History and Philosophy of Science and Technology] Brown Bag colloquium and a Wiegand Memorial Foundation Lecture on “Self-organization and God.” Select videos and podcasts of her public events are available on our website.

Dr. Anne Harrington, professor of History of Science at Harvard University, came to the Cluster Centre in October for a packed history of medicine luncheon conversation on “Culture in the Brain and Under the Skin”. This was followed by a post-performance discussion of placebo effect and medical attitudes and treatments after an original 2b Theatre production of “The Story of Mr. Wright.” Other recently supported events and visiting speakers to the Cluster Nodes include the Reading Artifacts Summer Institute at the Canada Science and Technology Museum (CSTM); Toronto’s Technoscience Salon on Ecologies; Women in Science and Engineering Symposium at McGiIll University; Dr. Suzanne Zeller, Wilfrid Laurier University in Halifax; Dr. Arun Bala, National University of Singapore at York University; Dr. Michael Lynch, Cornell University at U. Alberta [University of Alberta]; and many more.

II. UPCOMING WORKSHOPS, CONFERENCES AND EVENTS    

All of our events are supported by a host of partners and some are recorded, streamed live online or blogged about. Please visit our website for more information.

Fri. January 25, 5 PM, University of Toronto: “Technoscience Salon: Queer(y)ing Technologies.”

Wed., Feb. 27-28, National University of Singapore: “The Bright Dark Ages: Comparative and Connective Perspectives.”

Fri. Mar. 22-23, UBC [University of British Columbia]: Workshop on “Bodies in Motion: Translating Early Modern Science.”

Mon. April 1- Th. April 4, Calgary [University of Calgary], Edmonton [University of Alberta], Vancouver [University of British Columbia]: Dr. Evelyn Fox Keller continues her Node visits out west as the Cluster Visiting Scholar.

Fri. April 5, U. [University] King’s College: “Aelita: Queen of Mars” screening with live music.

Fri. Apr. 26-27, McGill University: McGill Node supports the Indian Ocean World Centreconference on “Histories of Medicine in the Indian Ocean.”

Fri. May. 3-4, York University: Conference on “Materiality: Objects and Idioms in Historical Studies of Science and Technology.”

Fri. Jun. 7-9, 2013, University of Calgary: Workshop on “Where is the Laboratory now? “Representation”, “Intervention” and “Realism” in 19th and 20th Century Biomedical Sciences.”

Mon. Oct. 21-23, 2013, U. Ottawa: Conference on “Science and Society.” In partnership with University of Ottawa’s Institute for Science, Society and Policy and the Professional Institute for the Public Service of Canada.

V. BLOGS, VIDEOS AND PODCASTS

Blogs: A fascinating array of blog entries on summer, fall and winter workshops, lectures and events are now available on our website here: www.situsci.ca/blog.

The entries treat topics as diverse as

  • “The Women Question in Science: Women in Science, Engineering and Medicine Symposium (WISEMS) 2012”,
  • “The Play’s the Thing: Putting History of Science on Stage”,
  • “The story I hold about myself: the epistemology of Mr. Wright”,
  • “Narrative Theory, Historical Ethics, Sound Reasoning Through Pseudo-Science, and Testing Implicit Bias: a day at the WISEMS”,
  • “A Week with the Wonder Photo Cannon”,
  • “Reflections on Reading Artifacts Summer Institute 2012”,
  • “Gender and the Digital Silo: Cultures of Knowledge at Situating Early Modern Science Networks Workshop” and
  • “Notes on Caring in a Technoscientific World”. Please feel free to share and comment.

Videos and Podcasts: Videos and podcasts of events are constantly uploaded and announced on our website and via our social media. The latest uploads include:

Evelyn Fox Keller speaking on “Self-Organization and God”, “Paradigm Shifts And Revolutions In Contemporary Biology” and “Legislating for Catastrophic Risk”.

Heinrich von Staden’s HOPOS 2012 presentation entitled “Experimentation in Ancient Science?

Make your carbon atoms stand taller to improve electronic devices

Scientists from Ireland ((Tyndall National Institute at University College Cork [UCC]) and Singapore (National University of Singapore [NUS]) have jointly published a paper about how they achieved a ten-fold increase in the switching efficiency of electronic devices by changing one carbon atom. From the Jan. 21, 2013 news item on ScienceDaily,

These devices could provide new ways to combat overheating in mobile phones and laptops, and could also aid in electrical stimulation of tissue repair for wound healing.

The breakthrough creation of molecular devices with highly controllable electrical properties will appear in the February [2013] issue of Nature Nanotechnology. Dr. Damien Thompson at the Tyndall National Institute, UCC and a team of researchers at the National University of Singapore led by Prof. Chris Nijhuis designed and created the devices, which are based on molecules acting as electrical valves, or diode rectifiers.

Dr. Thompson explains, “These molecules are very useful because they allow current to flow through them when switched ON and block current flow when switched OFF. The results of the study show that simply adding one extra carbon is sufficient to improve the device performance by more than a factor of ten. We are following up lots of new ideas based on these results, and we hope ultimately to create a range of new components for electronic devices.” Dr. Thompson’s atom-level computer simulations showed how molecules with an odd number of carbon atoms stand straighter than molecules with an even number of carbon atoms. This allows them to pack together more closely. Tightly-packed assemblies of these molecules were formed on metal electrode surfaces by the Nijhuis group in Singapore and were found to be remarkably free of defects. These high quality devices can suppress leakage currents and so operate efficiently and reliably. The device can be cleanly switched on and off purely on the basis of the charge and shape of the molecules, just like in the biological nanomachines that regulate photosynthesis, cell division and tissue growth.

The Jan. ??, 2013 University College Cork news release, which originated the news item, provides more details,

The combined experiments and simulations show for the first time that minute improvements in molecule orientation and packing trigger changes in van der Waals forces that are sufficiently large to dramatically improve the performance of electronic devices. Dr. Thompson explains: “These van der Waals forces are the weakest of all intermolecular forces and only become significant when summed over large areas. Hence, up until now, the majority of research into ultra-small devices has used stronger “pi-pi” interactions to stick molecules together, and has ignored the much weaker, but ubiquitous, van der Waals interactions. The present study shows how van der Waals effects, which are present in every conceivable molecular scale device, can be tuned to optimise the performance of the device.”

The devices are based on molecules that act as diodes by allowing current to pass through them when operated at forward bias and blocking current when the bias is reversed. Molecular rectifiers were first proposed back in 1974, and advances in scientific computing have allowed molecular‐level design to be used over the past decade to develop new organic materials that provide better electrical responses. However, the relative importance of the interactions between the molecules, the nature of the molecule-metal contact and the influence of environmental effects have been questioned. This new research demonstrates that dramatic improvements in device performance may be achieved by controlling the van der Waals forces that pack the molecules together. Simply changing the number of carbon atoms by one provides significantly more stable and more reproducible devices that exhibit an order of magnitude improvement in ON/OFF ratio. The research findings demonstrate the feasibility of boosting device performances by creating tighter seals between molecules.

Here a citation and a link to the paper,

The role of van der Waals forces in the performance of molecular diodes by Nisachol Nerngchamnong, Li Yuan, Dong-Chen Qi, Jiang Li, Damien Thompson, & Christian A. Nijhuis. Nature Nanotechnology (2013) doi:10.1038/nnano.2012.238 Advance online publication: Jan. 6, 2013.

This paper is behind a paywall.

Graphene, IBM’s first graphene-based integrated circuit, and the European Union’s pathfinder programme in information technologies

A flat layer of carbon atoms packed into a two-dimensional honeycomb arrangement, graphene is being touted as a miracle (it seems)  material which will enable new kinds of electronic products. Recently, there have been a number of news items and articles featuring graphene research.

Here’s my roundup of the latest and greatest graphene news. I’m starting with an application that is the closest to commercialization: IBM recently announced the creation of the first graphene-based integrated circuit. From the Bob Yirka article dated June 10, 2011 on physorg.com,

Taking a giant step forward in the creation and production of graphene based integrated circuits, IBM has announced in Science, the fabrication of a graphene based integrated circuit [IC] on a single chip. The demonstration chip, known as a radio frequency “mixer” is capable of producing frequencies up to 10 GHz, and demonstrates that it is possible to overcome the adhesion problems that have stymied researchers efforts in creating graphene based IC’s that can be used in analog applications such as cell phones or more likely military communications.

The graphene circuits were started by growing a two or three layer graphene film on a silicon surface which was then heated to 1400°C. The graphene IC was then fabricated by employing top gated, dual fingered graphene FET’s (field-effect transistors) which were then integrated with inductors. The active channels were made by spin-coating the wafer with a thin polymer and then applying a layer of hydrogen silsequioxane. The channels were then carved by e-beam lithography. Next, the excess graphene was removed with an oxygen plasma laser, and then the whole works was cleaned with acetone. The result is an integrated circuit that is less than 1mm2 in total size.

Meanwhile, there’s a graphene research project in contention for a major research prize in Europe. Worth 1B Euros, the European Union’s 2011 pathfinder programme (Future and Emerging Technologies [Fet11]) in information technology) will select two from six pilot actions currently under way to be awarded a Flagship Initiative prize.  From the Fet11 flagships project page,

FET Flagships are large-scale, science-driven and mission oriented initiatives that aim to achieve a visionary technological goal. The scale of ambition is over 10 years of coordinated effort, and a budget of up to one billion Euro for each Flagship. They initiatives are coordinated between national and EU programmes and present global dimensions to foster European leadership and excellence in frontier research.

To prepare the launch of the FET Flagships, 6 Pilot Actions are funded for a 12-month period starting in May 2011. In the second half of 2012 two of the Pilots will be selected and launched as full FET Flagship Initiatives in 2013.

Here’s the description of the Graphene Science and technology for ICT and beyond pilot action,

Graphene, a new substance from the world of atomic and molecular scale manipulation of matter, could be the wonder material of the 21st century. Discovering just how important this material will be for Information and Communication Technologies is the long term focus of the Flagship Initiative, simply called, GRAPHENE. This aims to explore revolutionary potentials, in terms of both conventional as well as radically new fields of Information and Communication Technologies applications.

Bringing together multiple disciplines and addressing research across a whole range of issues, from fundamental understandings of material properties to Graphene production, the Flagship will provide the platform for establishing European scientific and technological leadership in the application of Graphene to Information and Communication Technologies. The proposed research includes coverage of electronics, spintronics, photonics, plasmonics and mechanics, all based on Graphene.

[Project Team:]

Andrea Ferrari, Cambridge University, UK
Jari Kinaret, Chalmers University, Sweden
Vladimir Falko, Lancaster University, UK
Jani Kivioja, NOKIA, Finland [emphases mine]

Not so coincidentally (given one member of the team is associated with Nokia and another is associated with Cambridge University), the Nokia Research Centre jointly with Cambridge University issued a May 4, 2011 news release (I highlighted it in my May 6, 2011 posting [scroll down past the theatre project information]) about the Morph concept (a rigid, flexible, and stretchable phone/blood pressure cuff/calculator/and  other electronic devices in one product) which they have been publicizing for years now. The news release concerned itself with how graphene would enable the researchers to take the Morph from idea to actuality. The webpage for the Graphene Pilot Action is here.

There’s something breathtaking when there is no guarantee of success about the willingness to invest up to 1B Euros in a project that spans 10 years. We’ll have to wait until 2013 before learning whether the graphene project will be one of the two selected as Flagship Initiatives.

I must say the timing for the 2010 Nobel Prize for Physics which went to two scientists (Andre Geim and Konstantin Novoselov) for their groundbreaking work with graphene sems interesting (featured in my Oct. 7, 2010 posting) in light of this graphene activity.

The rest of these graphene items are about research that could lay the groundwork for future commercialization.

Friday, June 13, 2011 there was a news item about foaming graphene on Nanowerk (from the news item),

Hui-Ming Cheng and co-workers from the Chinese Academy of Sciences’ Institute of Metal Research at Shenyang have now devised a chemical vapor deposition (CVD) method for turning graphene sheets into porous three-dimensional ‘foams’ with extremely high conductivity (“Three-dimensional flexible and conductive interconnected graphene networks grown by chemical vapour deposition” [published in Nature Materials 10, 424–428 (2011) doi:10.1038/nmat3001 Published online 10 April 2011]). By permeating this foam with a siloxane-based polymer, the researchers have produced a composite that can be twisted, stretched and bent without harming its electrical or mechanical properties.

Here’s an image from the Nature Publishing Group (NPG) of both the vapour and the bendable, twistable, stretchable composite (downloaded from the news item on Nanowerk where you can find a larger version of the image),

A scanning electron microscopy image of the net-like structure of graphene foam (left), and a photograph of a highly conductive elastic conductor produced from the foam. (© 2011 NPG)

The ‘elastic’ conductor (image to the right) reminds me of the ‘paper’ phone which I wrote about May 8, 2011 and May 12, 2011. (It’s a project where teams from Queen’s University [in Ontario] and Arizona State University are working to create flexible screens that give you telephony, music playing and other capabilities  much like the Morph concept.)

Researchers in Singapore have developed a graphene quantum dot using a C60 (a buckminster fullerene). From the June 13, 2011 news item (Graphene: from spheres to perfect dots) on Nanowerk,

An electron trapped in a space of just a few nanometers across behaves very differently to one that is free. Structures that confine electrons in all three dimensions can produce some useful optical and electronic effects. Known as quantum dots, such structures are being widely investigated for use in new types of optical and electronics technologies, but because they are so small it is difficult to fabricate quantum dots reproducibly in terms of shape and size. Researchers from the National University of Singapore (NUS) and A*STAR have now developed a technique that enables graphene quantum dots of a known size to be created repeatedly and quickly (“Transforming C60 molecules into graphene quantum dots” [published in Nature Nanotechnology 6, 247–252 (2011) doi:10.1038/nnano.2011.30 Published online 20 March 2011]).

This final bit is about a nano PacMan that allows for more precise patterning from a June 13, 2011 article written by Michael Berger,

A widely discussed method for the patterning of graphene is the channelling of graphite by metal nanoparticles in oxidizing or reducing environments (see for instance: “Nanotechnology PacMan cuts straight graphene edges”).

“All previous studies of channelling behavior have been limited by the need to perform the experiment ex situ, i.e. comparing single ‘before’ and ‘after’ images,” Peter Bøggild, an associate professor at DTU [Danish Technical University] Nanotech, explains to Nanowerk. “In these and other ex situ experiments the dynamic behavior must be inferred from the length of channels and heating time after completion of the experiment, with the rate of formation of the channel assumed to be consistent over the course of the experiment.”

In new work, reported in the June 9, 2011 advance online edition of Nano Letters (“Discrete dynamics of nanoparticle channelling in suspended graphene” [published in Nano Letters, Article ASAP, DOI: 10.1021/nl200928k, Publication Date (Web): June 9, 2011]), Bøggild and his team report the nanoscale observation of this channelling process by silver nanoparticles in an oxygen atmosphere in-situ on suspended mono- and bilayer graphene in an environmental transmission electron microscope, enabling direct concurrent observation of the process, impossible in ex-situ experiments.

Personally, I love the youtube video I’ve included here largely because it features blobs (as many of these videos do) where they’ve added music and titles (many of these videos do not) so you can better appreciate the excitement,

From the article by Michael Berger,

As a result of watching this process occur live in a transmission electron microscope, the researchers say they have seen many details that were hidden before, and video really brings the “nano pacman” behavior to life …

There’s a reason why they’re so interested in cutting graphene,

“With a deeper understanding of the fine details we hope to one day use this nanoscale channelling behavior to directly cut desired patterns out of suspended graphene sheets, with a resolution and accuracy that isn’t achievable with any other technique,” says Bøggild. “A critical advantage here is that the graphene crystal structure guides the patterning, and in our case all of the cut edges of the graphene are ‘zigzag’ edges.”

So there you have it. IBM creates the first integrated graphene-based circuit, there’s the prospect of a huge cash prize for a 10-year project on graphene so they could produce the long awaited Morph concept and other graphene-based electronics products while a number of research teams around the world continue teasing out its secrets with graphene ‘foam’ projects, graphene quantum dots, and nano PacMen who cut graphene’s zigzag edges with precision.

ETA June 16, 2011: For those interested in the business end of things, i.e. market value of graphene-based products, Cameron Chai features a report, Graphene: Technologies, Applications, and Markets, in his June 16, 2011 news item on Azonano.