Glass transition of binary mixtures of dipolar particles in two dimensions

TL;DR

This study uses mode-coupling theory to analyze how the composition of binary dipolar particle mixtures in two dimensions affects the glass transition, revealing a plasticization effect that stabilizes the liquid state.

Contribution

It demonstrates that binary dipolar mixtures exhibit a plasticization effect and validates the model with experimental data, extending understanding of glass transitions in dipolar systems.

Findings

Plasticization effect stabilizes liquid state in dipolar mixtures.

Qualitative agreement between theory and experiment on glass transition.

General properties of glass transition lines discussed.

Abstract

We study the glass transition of binary mixtures of dipolar particles in two dimensions within the framework of mode-coupling theory, focusing in particular on the influence of composition changes. In a first step, we demonstrate that the experimental system of K\"onig et al. [Eur. Phys. J. E 18, 287 (2005)] is well described by point dipoles through a comparison between the experimental partial structure factors and those from our Monte Carlo simulation. For such a mixture of point particles we show that there is always a plasticization effect, i.e. a stabilization of the liquid state due to mixing, in contrast to binary hard disks. We demonstrate that the predicted plasticization effect is in qualitative agreement with experimental results. Furthermore, also some general properties of the glass transition lines are discussed.