Fall MRS 2012: Quasicrystals go mainstream

Posted on behalf of Ros Daw, Senior Editor, Nature

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It’s MRS time again and this year the meeting is bigger than ever with 52 symposia running in parallel. As an editor, it’s a painful task identifying which sessions to attend, knowing all the other potentially interesting talks that I will not be able to see. The MRS is attempting to address this for attendees by videoing many sessions to be made available online for viewing. So now I just need to find another 5 days to watch them all!

On Monday night I saw Dan Shechtman’s inspirational plenary lecture (1) describing the discovery of quasicrystals and his battles with the crystallography community — and with Linus Pauling — to get his ideas accepted. As quasicrystals are now appearing in all manner of materials systems, Shechtman’s talk emphasised the importance to researchers entering the field to go that extra mile to unambiguously confirm that they have truly seen a quasicrystal and not some other less interesting structural artefact.

A session the following morning in Symposium U: Colloidal Crystals, Quasicrystals, Assemblies, Jammings, and Packings explored the emerging field of soft aperiodic crystals. Two presenters described 18-fold symmetries in block copolymer micelles (2) (experimental data) and hard-core/square-shoulder particles (3) (Monte-Carlo simulations), symmetries which have yet to be seen in ‘conventional’ hard quasicrystals. Theorists are working hard to identify the mechanisms underlying the formation of such structures in soft matter and this subfield is growing rapidly — it is definitely one to watch.

(1) Quasicrystals: Discovery, Structure, Properties and Uses; Danny Shechtman; Plenary Session; 2012 Fall MRS.
(2) Quasicrystalline Lyotropic Phases; Stephan Foerster, Alexander Exner, Peter Lindner, Jan Perlich; Symposium U; 2012 Fall MRS.
(3) Quasicrystals Formed by Hard-core/Square-shoulder Particles; Tomonari Dotera, Tatsuya Oshiro, Primoz Ziherl; Symposium U; 2012 Fall MRS.

A team photo shoot

For those of you who haven’t noticed yet, there is a guest Thesis article this month from Dennis Curran — the article is available to subscribers and can be found here. It was not a straightforward essay to illustrate, but in the end we decided to hold our own photo shoot (after making our own protest signs!). The picture features five of us from the Nature Chemistry team — from left-to-right: Russell (associate editor, hiding behind his sign), me, Gavin (senior editor), Rebecca (senior editorial assistant) and Alison (senior production editor). The pic was taken by Alex (art editor), who was balanced precariously on top of a chair or two… missing from the picture are the very perplexed-looking passers-by!

PHOTO: ALEX WING AND STUART CANTRILL

December 2012 issue

Our December issue went live today and I just wanted to highlight a few things here on the blog. The issue includes a focus on site-selective reactions, including an editorial, two Articles — one from the group of Scott Miller and the other from Martin Burke’s group — and a News & Views article from Jacobsen and Tadross looking at those two pieces of research. The editorial is completely free (all of those in Nature journals are) and the other three articles are free to those registered on nature.com. And if you’re not already registered, it is free to do so.

Elsewhere in the issue, we have two Thesis articles; one from our regular columnist Michelle Francl on why chemists like to name things like reactions, theories and equations after people who discovered/developed/derived them, and a guest essay from Dennis Curran, who — with tongue firmly in cheek — welcomes us to a brave new world of organic chemistry where it is more important what isn’t in your reactions than what is. Curran’s article is illustrated with the result of a fun photo shoot featuring homemade protest signs and five of the extended Nature Chemistry team.

The In Your Element article is another of our competition entries, this one about plutonium, and is also free to registered users. Our periodic table has been updated accordingly. The rest of the issue content is available to subscribers, and don’t miss the Review article ($) from Chris Chang and co-workers about reaction-based small-molecule fluorescent probes. As we usually do, we’ll get the Blogroll column, written by Karl D Collins, up here on the blog as soon as we can.

 

IMAGE: SARANDIS MARINAKIS

COVER DESIGN: ALEX WING

Reactions: Mauricio Erben

Mauricio F. Erben is Adjunct Professor in the Department of Chemistry of the National University of La Plata, Argentina, and works on inorganic and physical chemistry of main group elements, mainly sulfur compounds.

1. What made you want to be a chemist?

Honestly, nothing in particular. When I was a kid, I was interested in natural sciences; not particularly chemistry, although I remember some experiments at home extracting chlorophyll from leaves using ethanol. However, during the secondary school, I turned my attention to questions of political economy. The final decision was adopted during the last year of my secondary school, when I did some training and spent a semester “working” in both a bank and a small biochemistry laboratory. I liked the second option more.

During my first year in the university, I was not decided between biochemistry and chemistry, yet. Luckily in the Universidad Nacional de La Plata both careers are in the same Faculty and finally I chose the “Licenciatura” in Chemistry.

2. If you weren’t a chemist and could do any other job, what would it be – and why?

Probably something related with education, I enjoy very much my job as a professor at the university. Because of the social relevance I would like to be a secondary school teacher, this is really a challenge!

3. What are you working on now, and where do you hope it will lead?

I’m working on main group chemistry, particularly the synthesis of sulfur-containing compounds. We determine some fundamental aspects on the electronic and structural properties of these compounds. For instances, we are trying to prepare new inorganic thionitrites, simple molecules that could serve as a model to understand more complexes systems. In particular, these species are of interest in connection with the physiological role of nitric oxide.

In a broader sense, my hope is to contribute to reinforce the scientific capacities of my country, in order to better response to the challenge we are currently facing. I think (following Oscar Varsvasky) that science is not neutral and science is a result of the society it’s developed in. And vice versa as well: the consequences of what we do in science and technology affects the profile of a society. So, as a nation, it is important to have science and technology that addresses our own problems.

4. Which historical figure would you most like to have dinner with – and why?

On July 26, 1822, a secret meeting took place, in Guayaquil, Ecuador, between the principal leaders of the South American wars of independence, the “liberators” José de San Martín and Simón Bolívar, it was called “The Guayaquil Conference”.

There are many hypotheses on what exactly they discussed, but no one really knows all that went on at that memorable interview. After the meeting, a banquet was given: I would like to be among the guests invited at that dinner.

5. When was the last time you did an experiment in the lab – and what was it?

I am quite active in the laboratory, indeed. For instance, last week a PhD student synthesized a novel thionitrite. As mentioned above, these are fascinating covalent molecules that are strongly coloured. We are now investigating the electronic transitions by using UV, fluorescence and Raman resonant spectroscopy.

6. If exiled on a desert island, what one book and one music album would you take with you?

I would take some stories by J. L. Borges, for instances “Ficciones” (Fictions) or “The Aleph”. My song would be “Adiós Nonino” a beautiful tango by Astor Piazolla.

I realized that both pieces are from Argentinean authors!

7. Which chemist would you like to see interviewed on Reactions – and why?

Interview Mario Molina, winner of the 1995 Nobel Price in Chemistry. It is interesting how his research activity (ozone depletion) influences many aspects of the political, social and economic life. The present discussions on the climate change probably will define the fate of the chemistry in the medium term future, especially in relation with energy production and agricultural practices.

Reactions: Timothy Shiau

Timothy Shiau is an Assistant Director in the department of Drug Discovery, at NovaBay Pharmaceuticals and a Principal Chemist at Emeryville Pharmaceutical Services, and primarily works on topical antiinfective agents and NeutroPhase, a skin and wound cleanser .

1. What made you want to be a chemist?

All throughout my life, I’ve been attracted to building things. I built a lot of Lego spaceships as a child, and was particularly fascinated with the idea of design. I never built any of the spaceships the instructions told me to build – I’d just throw all my Legos into a big pile and create my own. That fascination with design transferred to organic chemistry in high school, when I turned to the back of the book (the part we weren’t going to study) and started reading about all the different molecules that could be made with just carbon, hydrogen, nitrogen, and oxygen. At that point, the builder in me took over.

2. If you weren’t a chemist and could do any other job, what would it be – and why?

Prior to my discovery of organic chemistry, I had always wanted to be a computer programmer, for much of the same reasons that led me to be a synthetic chemist. Like molecules, computer programs are machines, built and designed to accomplish a purpose. Like synthetic chemistry, there’s a sense of accomplishment watching your machine at work, and an extra measure of satisfaction seeing it do something that nobody had done before.

3. What are you working on now, and where do you hope it will lead?

NovaBay’s main program involves a set of topical antiinfective compounds called Aganocide® compounds. They’re N-chloroamine and N-chloroamide containing molecules which inactivate proteins on viruses, bacteria, as well as fungi. Most importantly, these compounds selectively attack microbes over human cells with no chance of resistance. NovaBay’s goal is to reduce the overuse of antibiotics for applications that don’t really need systemic drugs – eye, ear, skin, and wound infections are all readily treatable with Aganocides.

4. Which historical figure would you most like to have dinner with – and why?

Georges Lemaître, a physicist who was one of the first to propose an expanding universe – in addition to being an engineer, decorated WWI veteran, as well as a priest! I’d love to hear his thoughts on having so many vastly different experiences in life.

5. When was the last time you did an experiment in the lab – and what was it?

This afternoon. My coworker, Dr. Dmitri Debabov, and I have started a new company, Emeryville Pharmaceutical Services, which partners with small companies in the San Francisco Bay Area to provide NMR, LCMS, and Microbiology services to people who may not have their own infrastructure or lack the expertise to run some of the tough experiments like 2-D NMR or biofilm assays. Today, I ran a 31P-13C HMBC to locate where a phosphorylation had occurred on a large molecule.

6. If exiled on a desert island, what one book and one music album would you take with you?

I would bring a star chart so that I could enjoy the magnificent, unspoiled view of the night sky. I suppose, then, it would be only appropriate that I listen to the Jupiter movement from Gustav Holst’s The Planets.

7. Which chemist would you like to see interviewed on Reactions – and why?

Prof. John Soderquist at the University of Puerto Rico is an exciting and excitable guy who excels in chemistry as well as personal anecdotes. I’d love to see his wit and wisdom in a future post.