Colloidal Quasicrystals: How Entropy can lead to Forbidden Symmetries

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• Dr Laura Filion, University of Utrecht
• Wednesday 20 November 2024, 14:30-15:30
• Unilever Lecture Theatre, Yusuf Hamied Department of Chemistry.

If you have a question about this talk, please contact Lisa Masters.

Quasicrystals are one of the most intriguing phases in classical matter. Defying the normal constraint of periodicity that applies to normal crystal structures, they can exhibit rotational symmetries that are forbidden for periodic crystals, e.g. 10-, 12-, 18-, 20-fold symmetries. These symmetries can be easily recognized in their diffraction patterns—and it is this characteristic that led to their original discovery by Dan Shechtman in 1984. While quasicrystals were first found in atomic systems, they have since been found in a growing number of soft-matter systems, including nanoparticles, polymers, and micelles. How simple can a system be and still exhibit such an atypical, complex phase? Why does such a phase form in the first place? In this talk I will address these questions, and many others regarding the appearance of quasicrystals in soft matter. In particular, I will show how even a simple system of hard spheres can be designed to form quasicrystals. I will discuss the huge importance of entropy in their stabilization, and end the talk by delving into the appearance of point defects in these systems – and introducing new simulation methods that will help us address them.

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

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