Soft Matter Quasicrystals and Their Complex Cousins

Add to your list(s) Download to your calendar using vCal

• Professor Sharon Glotzer, University of Michigan
• Tuesday 25 November 2014, 16:00-17:00
• Wolfson Lecture Theatre, Department of Chemistry.

If you have a question about this talk, please contact Sian Bunnage.

First BP lecture 2014

Quasiperiodic crystals with long range rotational symmetry but no translational repeat unit have been known in metallic alloys since they were first reported in 1984. Yet only in the past decade have such complex structures been reported in soft materials, comprised of, e.g., polymers, macromolecules, nanoparticles and colloids. In nearly all of these soft matter systems, quasiperiodicity is entropically stabilized, and any interactions are essentially short range. Interestingly, despite the fact that most metallic quasicrystals exhibit icosahedral symmetry, no icosahedral quasicrystals have been reported for soft matter systems. Instead, primarily 12-fold rotational symmetries are found, with recent, occasional reports of 8-fold, 10-fold, 18-fold, and even 24-fold planar quasicrystals. In his talk, we discuss common features and unifying principles for the self-assembly of soft matter quasicrystals, and we present results for the first icosahedral quasicrystal to be thermodynamically self-assembled in a computer simulation. This icosahedral quasicrystal is robust over a range of parameters, and is obtained from a single particle type interacting via a short-ranged, oscillatory pair potential that may be achievable in systems of colloidal spheres. The icosahedral quasicrystal we report is surrounded in parameter space by clathrates, important for deep sea methane storage, and other new crystal structures never before reported in a one-component system.

This talk is part of the Materials Chemistry Research Interest Group series.

This talk is included in these lists:

• All Talks (aka the CURE list)
• Department of Chemistry
• Featured lists
• Lennard-Jones Centre external
• Materials Chemistry Research Interest Group
• School of Physical Sciences
• Wolfson Lecture Theatre, Department of Chemistry

Note that ex-directory lists are not shown.