Secondary ion mass spectrometry has been used to characterize translational motion in vapor-deposited glasses of indomethacin (IMC) and α,α,β-tris-naphthylbenzene (TNB). Vapor deposition onto substrates at ∼0.99 Tg produced ordinary glasses that evolve according to Fickian diffusion during annealing. The resulting self-diffusion coefficients for the supercooled liquids are in good agreement with previous reports. Deposition onto substrates at 0.85 Tg produced highly stable glasses that transform with a propagating front mechanism. In contrast to previous reports, the liquid produced by this transformation has the same translational mobility as the ordinary supercooled liquid; we associate this result with lower impurity levels in the current samples. The front velocities for both TNB and IMC stable glasses are very similar functions of the translational self-diffusion coefficients of the supercooled liquids, consistent with view that the growth front velocity is controlled by mobility in the liquid adjacent to the stable glass.
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28 November 2012
Research Article|
November 30 2012
Stable glasses of indomethacin and α,α,β-tris-naphthylbenzene transform into ordinary supercooled liquids
A. Sepúlveda;
A. Sepúlveda
Department of Chemistry,
University of Wisconsin-Madison
, Madison, Wisconsin 53706, USA
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Stephen F. Swallen;
Stephen F. Swallen
Department of Chemistry,
University of Wisconsin-Madison
, Madison, Wisconsin 53706, USA
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Laura A. Kopff;
Laura A. Kopff
Department of Chemistry,
University of Wisconsin-Madison
, Madison, Wisconsin 53706, USA
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Robert J. McMahon;
Robert J. McMahon
Department of Chemistry,
University of Wisconsin-Madison
, Madison, Wisconsin 53706, USA
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M. D. Ediger
M. D. Ediger
a)
Department of Chemistry,
University of Wisconsin-Madison
, Madison, Wisconsin 53706, USA
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a)
Author to whom correspondence should be addressed. Electronic mail: [email protected]. Telephone: 608-262-7273.
J. Chem. Phys. 137, 204508 (2012)
Article history
Received:
August 30 2012
Accepted:
November 05 2012
Citation
A. Sepúlveda, Stephen F. Swallen, Laura A. Kopff, Robert J. McMahon, M. D. Ediger; Stable glasses of indomethacin and α,α,β-tris-naphthylbenzene transform into ordinary supercooled liquids. J. Chem. Phys. 28 November 2012; 137 (20): 204508. https://doi.org/10.1063/1.4768168
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