Entropy-driven self-assembly of novel phases
- Event time: 1:00pm
- Event date: 26th March 2012
- Speaker: Laura Filion (University of Cambridge)
- Location: Room 2511, James Clerk Maxwell Building (JCMB) James Clerk Maxwell Building Peter Guthrie Tait Road Edinburgh EH9 3FD GB
Entropy driven phase transitions have been of interest for more than half a century. Although early work on hard-sphere freezing was originally met with skepticism, phase transitions in hard particles are now generally accepted. While the behaviour of hard spheres and rods has remained an active focus of research for decades, entropy-driven phase transitions of more complicated hard particles have recently attracted great interest. This new interest has arisen, at least partially, due to advances in (nano) particle synthesis: hard particles are not simply toy theoretical problems, many are now experimentally realizable systems.
In this talk I will discuss the phase diagrams of two entropy-driven systems which display unexpected phase behaviour: a binary mixture of hard spheres, and single component system consisting of hard cubes. In the case of the binary hard spheres, I show, for a size ratio around 0.3, that there is a stable, completely tunable interstitial solid solution. In the case of the cubes, we find a stable crystal with 6% vacancies: orders of magnitude larger than is typical in simple, single component systems.
This is a weekly series of informal talks given primarily by members of the soft condensed matter and statistical mechanics groups, but is also open to members of other groups and external visitors. The aim of the series is to promote discussion and learning of various topics at a level suitable to the broad background of the group. Everyone is welcome to attend..