Kinetic stability and heat capacity of vapor-deposited glasses of o-terphenyl

The Journal of Chemical Physics
Katherine R WhitakerM D Ediger

Abstract

The reversing heat capacity of vapor-deposited o-terphenyl glasses was determined by in situ alternating current nanocalorimetry. Glasses were deposited at substrate temperatures ranging from 0.39 Tg to Tg, where Tg is the glass transition temperature. Glasses deposited near 0.85 Tg exhibited very high kinetic stability; a 460 nm film required ∼10(4.8) times the structural relaxation time of the equilibrium supercooled liquid to transform into the liquid state. For the most stable o-terphenyl glasses, the heat capacity was lower than that of the ordinary liquid-cooled glass by (1 ± 0.4)%; this decrease represents half of the difference in heat capacity between the ordinary glass and crystal. Vapor-deposited o-terphenyl glasses exhibit greater kinetic stability than vapor-deposited glasses of indomethacin, in qualitative agreement with recent surface diffusion measurements indicating faster surface diffusion on o-terphenyl glasses. The stable glass to supercooled liquid transformation was thickness-dependent, consistent with transformation via a propagating front initiated at the free surface.

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Citations

Jan 3, 2016·The Journal of Chemical Physics·M TylinskiM D Ediger
Jul 13, 2016·The Journal of Physical Chemistry. B·Yinshan ChenLian Yu
Nov 9, 2016·The Journal of Chemical Physics·M TylinskiM D Ediger
Jul 3, 2016·The Journal of Chemical Physics·Y Z ChuaC Schick
Feb 22, 2017·The Journal of Physical Chemistry. B·Audrey LaventureM D Ediger
Jan 18, 2016·Advanced Drug Delivery Reviews·Lian Yu
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Jun 3, 2017·The Journal of Chemical Physics·M TylinskiM D Ediger
Jun 10, 2019·The Journal of Chemical Physics·Birte RiechersRanko Richert
Nov 11, 2019·The Journal of Chemical Physics·Birte RiechersRanko Richert
Feb 10, 2017·The Journal of Chemical Physics·Jaritza GómezM D Ediger
Dec 10, 2017·The Journal of Chemical Physics·M D Ediger
Oct 3, 2020·The Journal of Chemical Physics·M S BeasleyM D Ediger
Apr 19, 2019·The Journal of Physical Chemistry. B·Subarna SamantaZahra Fakhraai
May 24, 2019·Chemical Reviews·Qiuju ZhengYuanzheng Yue
Dec 29, 2020·The Journal of Physical Chemistry. B·Kushal BagchiM D Ediger
Jun 28, 2017·The Journal of Physical Chemistry. B·Yinshan ChenLian Yu

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