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Vitrification, relaxation and free volume in glycerol-water binary liquid mixture:Spin probe ESR studies

Banerjee, Debamalya and Bhat, SV (2009) Vitrification, relaxation and free volume in glycerol-water binary liquid mixture:Spin probe ESR studies. In: Journal of Non-Crystalline Solids, 355 (50-51). pp. 2433-2438.

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Abstract

Glass transition and relaxation of the glycerol-water (G-W) binary mixture system have been studied over the glycerol concentration range of 5-85 mol% by using the highly sensitive technique of electron spin resonance (ESR). For the water rich mixture the glass transition,sensed by the dissolved spin probe, arises from the vitrified mesoscopic portion of the binary system. The concentration dependence of the glass transition temperature manifests a closely related molecular level cooperativity in the system. A drastic change in the mesoscopic structure of the system at the critical concentration of 40 mol is confirmed by an estimation of the spin probe effective volume in a temperature range where the tracer reorientation is strongly coupled to the system dynamics.

Item Type: Journal Article
Additional Information: copyright of this article belongs to Elsevier science.
Keywords: Glass transition;Electron spin resonance;Fragility;Structural relaxation.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 10 Jan 2010 11:38
Last Modified: 19 Sep 2010 05:53
URI: http://eprints.iisc.ernet.in/id/eprint/25280

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