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Issue 27, 2014
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Acoustic dynamics of supercooled indomethacin probed by Brillouin light scattering

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Abstract

Acoustics dynamics of the molecular glass-former indomethacin (IMC) have been investigated by Brillouin light scattering (BLS) at GHz frequencies. Elastic response of the system has been tracked from the melting temperature down to the glass transition through the supercooled liquid. Both the structural arrest and the vibrational dynamics are described by modeling the experimentally determined dynamic structure factor within the framework of the Langevin equation, through a simplified choice of memory function which allows one to determine sound velocity and the acoustic attenuation coefficient as a function of temperature. The density fluctuation spectra in the glassy phase, as probed by BLS, are compared with time-domain results from photoacoustics experiments. The arising scenario is discussed in the context of current literature reporting inelastic X-ray scattering and BLS in platelet geometry. The link between the probed elastic properties and the non-ergodicity factor of the glass phase is finally scrutinized.

Graphical abstract: Acoustic dynamics of supercooled indomethacin probed by Brillouin light scattering

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Article information


Submitted
02 Apr 2014
Accepted
29 May 2014
First published
29 May 2014

Phys. Chem. Chem. Phys., 2014,16, 14206-14211
Article type
Paper
Author version available

Acoustic dynamics of supercooled indomethacin probed by Brillouin light scattering

S. De Panfilis, E. A. A. Pogna, A. Virga and T. Scopigno, Phys. Chem. Chem. Phys., 2014, 16, 14206
DOI: 10.1039/C4CP01427H

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