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Systems with Size and Energy Polydispersity: From Glasses to Mosaic Crystals

Department of Physics, and Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat Gan 52900, Israel
Author to whom correspondence should be addressed.
Entropy 2020, 22(5), 570;
Received: 15 April 2020 / Revised: 12 May 2020 / Accepted: 18 May 2020 / Published: 19 May 2020
(This article belongs to the Special Issue Entropic Control of Soft Materials)
We use Langevin dynamics simulations to study dense 2d systems of particles with both size and energy polydispersity. We compare two types of bidisperse systems which differ in the correlation between particle size and interaction parameters: in one system big particles have high interaction parameters and small particles have low interaction parameters, while in the other system the situation is reversed. We study the different phases of the two systems and compare them to those of a system with size but not energy bidispersity. We show that, depending on the strength of interaction between big and small particles, cooling to low temperatures yields either homogeneous glasses or mosaic crystals. We find that systems with low mixing interaction, undergo partial freezing of one of the components at intermediate temperatures, and that while this phenomenon is energy-driven in both size and energy bidisperse systems, it is controlled by entropic effects in systems with size bidispersity only. View Full-Text
Keywords: size and energy polydispersity; mosaic crystals; partial freezing size and energy polydispersity; mosaic crystals; partial freezing
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Azizi, I.; Rabin, Y. Systems with Size and Energy Polydispersity: From Glasses to Mosaic Crystals. Entropy 2020, 22, 570.

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