# Enthalpy and high temperature relaxation kinetics of stable vapor-deposited glasses of toluene Source: [Enthalpy and high temperature relaxation kinetics of stable vapor-deposited glasses of toluene]() Collection index: [llms.txt]() Data updated: 2025-10-24T18:47:04.341Z Authors: Deepanjan Bhattacharya, Vlad Sadtchenko Published: 2014-06-18T00:21:55.000Z ## Abstract Stable non-crystalline toluene films of micrometer and nanometer thicknesses were grown by vapor deposition at distinct rates and probed by Fast Scanning Calorimetry. Fast scanning calorimetry is shown to be extremely sensitive to the structure of the vapor-deposited phase and was used to characterize simultaneously its kinetic stability and its thermodynamic properties. According to our analysis, transformation of vapor -deposited samples of toluene during heating with rates in excess 10^5 K/s follows the zero-order kinetics. The transformation rate correlates strongly with the initial enthalpy of the sample, which increases with the deposition rate according to sub-linear law. Analysis of the transformation kinetics of vapor deposited toluene films of various thicknesses reveal a sudden increase in the transformation rate for films thinner than 250 nm. The change in kinetics correlates with the surface roughness scale of the substrate, which is interpreted as evidence for kinetic anisotropy of the samples. The implications of these findings for the formation mechanism and structure of vapor deposited stable glasses are discussed. ## Recorded benchmark results A research result applies to its stated dataset, split, metric and evaluation configuration. Compare like-for-like settings, preserve the metric's unit and direction, and distinguish paper-reported results from independent reproduction. The best result recorded here is not a claim of exhaustive, current global coverage. ## Original sources and implementation [Original paper]() [PDF]()