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The 2012 Van Winter Memorial Lecture: Paul Steinhardt and Quasicrystals

Each year, the Department of Mathematics and the Department of Physics and Astronomy jointly organize the Van Winter Memorial Lecture, which brings in distinguished speakers to give lectures on matters of common interest to mathematicians and physicists.

This year's speaker is Paul Steinhardt, professor of physics and astrophysics at Princeton University, and director of the Princeton Center for Theoretical Sciences. In this podcast, we spoke to Sumit Das, who will be hosting the lecture, about some of professor Steinhardt's research.

Professor Steinhardt's lecture will be titled, "Once Upon a Time in Kamchatka: the Extraordinary Search for Natural Quasicrystals." The presentation will be on Friday, March 23, from 3:15 pm to 4:15 pm, in room 139 of the Chemistry-Physics building.

In short, a quasicrystal is a type of structure that shows rotational symmetry, but is not periodic -- it doesn't have a pattern that repeats over a distance. Quasicrystals can be composed of sets of a few shapes that are arranged to fill up a space, and although they may have radial patterns, these do not repeat around the crystal in any noticeable order. Usually, it has been thought that crystals can only have two-, four-, or six-sided radial patterns, but quasicrystals can have five-sided rotational symmetry as well, such as in these structures:

A Penrose tiling of thick and thin rhombi.An atomic model of fivefold icosahedral-Al-Pd-Mn quasicrystal surface.A Penrose tiling using thick and thin rhombi.

 

 

 

 

 

This podcast was produced by Stephen Gordinier.

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This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.

Allan Butterfield: UK Alumni Association Endowed Professor of Biological Chemistry - UK at the Half with Carl Nathe

Allan Butterfield, professor of Chemistry and Director of the Center of Membrane Sciences, has been named a UK Alumni Association Endowed Professor. Butterfield's research tackles issues surrounding Alzheimer's Disease and related research areas in biological chemistry. Carl Nathe, host of UK at the Half, interviewed him for the radio program, which airs during each UK football game.

Xenon Research at UK's Particle Accelerator: Erin Peters

Erin Peters is a graduate student in the Chemistry Department, president of the Chemistry Graduate Student Association at UK, and graduate research assistant to Steven Yates. In this interview, Peters talks about her research at UK’s particle accelerator.

This podcast was produced by Stephen Gordinier.

Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.

Pear-Shaped Nuclei, Particle Accelerators, and Zebras: Steven Yates

Steven Yates is an Arts & Sciences Distinguished Professor who works in the departments of both Chemistry and Physics and Astronomy.

In this interview, Yates discusses his recent collaboration with the iThemba Laboratory, a nuclear particle accelerator facility in Cape Town, South Africa.

This podcast was produced by Stephen Gordinier.

Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.

Meet Chemistry's Crystallographer: Sean Parkin

Sean Parkin uses x-ray technology to determine the molecular structure of crystals for the UK Chemistry Department. UK's Crystallography lab has some of the best equipment in North America.

This podcast was produced by Cheyenne Hohman.

Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.

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