Nano Archive

Localized diffusive motion on two different time scales in solid alkane nanoparticles

Wang, S.-K. and Mamontov, E. and Bai, M. and Hansen, F. Y. and Taub, H. and Copley, J. R. D. and Sakai, V. García and Gasparovic, G. and T.Jenkins, and Tyagi, M. and Herwig, K. W. and Neumann, D. A. and Montfrooij, W. and Volkmann, U. G. (2010) Localized diffusive motion on two different time scales in solid alkane nanoparticles. EPL (Europhysics Letters), 91 (6). p. 66007.

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Official URL: http://stacks.iop.org/0295-5075/91/i=6/a=66007

Abstract

High-energy-resolution quasielastic neutron scattering on three complementary spectrometers has been used to investigate molecular diffusive motion in solid nano- to bulk-sized particles of the alkane n -C 32 H 66 . The crystalline-to-plastic and plastic-to-fluid phase transition temperatures are observed to decrease as the particle size decreases. In all samples, localized molecular diffusive motion in the plastic phase occurs on two different time scales: a "fast" motion corresponding to uniaxial rotation about the long molecular axis; and a "slow" motion attributed to conformational changes of the molecule. Contrary to the conventional interpretation in bulk alkanes, the fast uniaxial rotation begins in the low-temperature crystalline phase.

Item Type:Article
ID Code:11205
Deposited By:Prof. Alexey Ivanov
Deposited On:01 Nov 2011 23:26
Last Modified:02 Nov 2011 00:47

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