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Decoupling of diffusion from viscosity: Difference scenario for translational and rotational motions

Bagchi, B and Bhattacharyya, S (1999) Decoupling of diffusion from viscosity: Difference scenario for translational and rotational motions. In: 4th Meeting of the Royal-Society-Unilever-Indo-UK Forum in Materials Science and Engineering, 1999, Pune, India.

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Abstract

Recent experiments have indicated a dramatically different viscosity dependence of the translational and the rotational diffusion coefficients in a supercooled liquid as the glass transition temperature is approached from above. While the translational motion seems to be decoupled from the rising viscosity (eta), the rotational motion seems to remain firmly coupled to eta. In order to understand the microscopic origin of this behavior, we have carried nut detailed theoretical calculations of both the quantities by using a self-consistent mode-coupling theory (MCT). it is found that when the size of the solute is same as that of the solvent molecules, the conventional MCT fails to predict the observed decoupling. The solvent inhomogeneity is found to play a decisive role in determining the decoupling. The difference in the viscosity dependence between rotation and translational diffusion coefficient is discussed.

Item Type: Conference Paper
Additional Information: Copyright of this article belongs to Imperial College Press.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 16 Mar 2012 09:08
Last Modified: 16 Mar 2012 09:08
URI: http://eprints.iisc.ernet.in/id/eprint/43901

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