Surface-Bulk Interplay in Vapor-Deposited Glasses: Crossover Length and the Origin of Front Transformation

Research output: Contribution to journalArticleResearch

3 Citations (Scopus)

Abstract

Thin film stable glasses transform into a liquid by a moving front that propagates from surfaces or interfaces with higher mobility. We use calorimetric data of vapor-deposited glasses of different thicknesses and stabilities to identify the role of glassy and liquid dynamics on the transformation process. By invoking the existence of an ultrathin intermediate layer whose transformation strongly depends on the properties of both the liquid and the glass, we show that the recovery to equilibrium is driven by the mismatch in the dynamics between glass and liquid. The lifetime of this intermediate layer associated with the moving front is the geometric mean between the bulk transformation time and the alpha relaxation time. Within this view, we explain the observed dependencies of the growth front velocity and the crossover length with both stability and temperature. Extrapolation of these results points towards ordinary thin film glasses transforming via a frontlike transformation mechanism if heated sufficiently fast, establishing a close connection between vapor-deposited and liquid-cooled glasses.
Original languageEnglish
Article number155501
Pages (from-to)155501
Number of pages6
JournalPhysical Review Letters
Volume123
Issue number15
DOIs
Publication statusPublished - 11 Oct 2019

Keywords

  • DYNAMICS
  • MOLECULAR PACKING
  • ORGANIC GLASSES
  • RELAXATION
  • TEMPERATURE
  • THERMAL-STABILITY
  • TOLUENE
  • TRANSITION
  • ULTRASTABLE GLASSES

Fingerprint Dive into the research topics of 'Surface-Bulk Interplay in Vapor-Deposited Glasses: Crossover Length and the Origin of Front Transformation'. Together they form a unique fingerprint.

Cite this