The complex behavior of the “simplest” liquid: Breakdown of density scaling in tetramethyl tetraphenyl trisiloxane
Abstract
Dielectric relaxation measurements, in combination with density determinations, on tetramethyl tetraphenyl trisiloxane (DC704) over an unusually broad range of temperatures and pressures revealed a state-point dependency in its density scaling exponent. This is the first unambiguous experimental demonstration of a breakdown of density scaling in a nonassociated glass-forming material, and unanticipated for DC704, among the “simplest” of liquids, having a constant breadth of the relaxation dispersion and a Prigogine-Defay ratio near unity characteristic of approximate single-parameter systems. We speculate that the anomalous behavior has origins in the large value of its scaling exponent and relative flexibility of the chemical structure.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Nov 04, 2019
- Source ID
- 10.1063/1.5121021
Entities
People
- C. Michael Roland
- Daniel Fragiadakis
- Riccardo Casalini
- Timothy Ransom
Organizations
- Office of Naval Research
- United States Naval Research Laboratory