Pressure densification of a simple liquid

TL;DR

This study investigates how pressure during vitrification influences the density of a simple, non-associated glass-forming liquid, revealing behaviors typically seen in hydrogen-bonded systems but unexpected for simple liquids.

Contribution

It demonstrates pressure densification effects in a simple liquid, challenging existing models that predict such behavior only in complex or hydrogen-bonded liquids.

Findings

Pressure during vitrification affects glass density.

Behavior observed is unusual for simple liquids.

Properties in the glassy state are pressure-dependent.

Abstract

The magnitude of the high frequency, static dielectric permittivity is used to determine the density of tetramethyl tetraphenyl trisiloxane, a non-associated glass-forming liquid, as a function of temperature and pressure. We demonstrate that the properties in the glassy state are affected by the pressure applied to the liquid during vitrification. This behavior is normal for hydrogen-bonded liquids and polymers, but unanticipated by models of simple liquids.