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Issue 44, 2010
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Stability of thin film glasses of toluene and ethylbenzene formed by vapor deposition: an in situ nanocalorimetric study

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Abstract

Vapor deposited thin films (∼100 nm thickness) of toluene and ethylbenzene grown by physical vapor deposition show enhanced stability with respect to samples slowly cooled from the liquid at a rate of 5 K min−1. The heat capacity is measured in situ immediately after growth from the vapor or after re-freezing from the supercooled liquid at various heating rates using quasi-adiabatic nanocalorimetry. Glasses obtained from the vapor have low enthalpies and large heat capacity overshoots that are shifted to high temperatures. The stability is maximized at growth temperatures in the vicinity of 0.8 Tg for both molecules, although glasses of ethylbenzene show superior stabilization. Our data is consistent with previous results of larger organic molecules suggesting a generalized behavior on the stability of organic glasses grown from the vapor. In addition, we find that for the small molecules analyzed here, slowing the growth rate below 0.1 nm s−1 does not result in increased thermodynamic stability.

Graphical abstract: Stability of thin film glasses of toluene and ethylbenzene formed by vapor deposition: an in situ nanocalorimetric study

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Publication details

The article was received on 13 Apr 2010, accepted on 30 Jul 2010 and first published on 13 Oct 2010


Article type: Paper
DOI: 10.1039/C0CP00208A
Citation: Phys. Chem. Chem. Phys., 2010,12, 14693-14698
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    Stability of thin film glasses of toluene and ethylbenzene formed by vapor deposition: an in situ nanocalorimetric study

    E. Leon-Gutierrez, A. Sepúlveda, G. Garcia, M. T. Clavaguera-Mora and J. Rodríguez-Viejo, Phys. Chem. Chem. Phys., 2010, 12, 14693
    DOI: 10.1039/C0CP00208A

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