Observation of Liquid Glass in Molecular Dynamics Simulations
arXiv:2401.01938 · doi:10.1063/5.0196599
Abstract
Molecular anisotropy plays an important role in the glass transition of a liquid. Recently, a novel bulk glass state has been discovered by optical microscopy experiments on suspensions of ellipsoidal colloids. 'Liquid glass' is a disordered analog of a nematic liquid crystal, in which rotation motion is hindered but particles diffuse freely. Global nematic order is suppressed as clusters of aligned particles intertwine. We perform Brownian dynamics simulations to test the structure and dynamics of a dense system of soft ellipsoidal particles. As seen in experiments and in accordance with predictions from mode coupling theory, on the time scale of our simulations rotation motion is frozen but translation motion persists in liquid glass. Analyses of the dynamic structure functions for translation and rotation corroborates the presence of two separate glass transitions for rotation and translation, respectively. Even though the equilibrium state should be a nematic, aligned structures remain small and orientational order rapidly decays with increasing size. Long-wavelength fluctuations are remnants of the isotropic-nematic transition.
final version
References in corpus (10)
- Coupling/decoupling between translational and rotational dynamics in a supercooled molecular liquid
- An introduction to the colloidal glass transition
- Dynamics of uniaxial hard ellipsoids
- Observation of liquid glass in suspensions of ellipsoidal colloids
- Novel crystal phase in suspensions of hard ellipsoids
- Glassy dynamics in monodisperse hard ellipsoids
- Deconstructing the glass transition through critical experiments on colloids
- Dynamical facilitation governs glassy dynamics in suspensions of colloidal ellipsoids
- Soft Metamaterials: Adaptation and Intelligence
- Relaxation dynamics in a binary hard-ellipse liquid