Slow dynamics of a confined supercooled binary mixture II: Q space analysis

TL;DR

This study analyzes the wavevector space behavior of a confined supercooled binary mixture, finding that despite confinement, its dynamics align with bulk supercooled liquids and follow Mode Coupling Theory predictions.

Contribution

It provides the first detailed wavevector space analysis of a confined supercooled binary mixture, confirming Mode Coupling Theory applicability under confinement.

Findings

Relaxation times follow a power law with wavevector and temperature.

Von Schweidler scaling holds over an extended wavevector range.

Parameters are consistent with bulk supercooled liquid values.

Abstract

We report the analysis in the wavevector space of the density correlator of a Lennard Jones binary mixture confined in a disordered matrix of soft spheres upon supercooling. In spite of the strong confining medium the behavior of the mixture is consistent with the Mode Coupling Theory predictions for bulk supercooled liquids. The relaxation times extracted from the fit of the density correlator to the stretched exponential function follow a unique power law behavior as a function of wavevector and temperature. The von Schweidler scaling properties are valid for an extended wavevector range around the peak of the structure factor. The parameters extracted in the present work are compared with the bulk values obtained in literature.