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

S. K. Wang; E. Mamontov; M. Bai; Flemming Yssing Hansen; H. Taub; J.R.D. Copley; V.G. Sakai; G. Gasparovic; T. Jenkins; M. Tyagi; K.W. Herwig; D.A. Neumann; W. Montfrooij; U.G. Volkmann

doi:10.1209/0295-5075/91/66007

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

S. K. Wang, E. Mamontov, M. Bai, Flemming Yssing Hansen, H. Taub, J.R.D. Copley, V.G. Sakai, G. Gasparovic, T. Jenkins, M. Tyagi, K.W. Herwig, D.A. Neumann, W. Montfrooij, U.G. Volkmann

Department of Chemistry

Research output: Contribution to journal › Journal article › Research › peer-review

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-C32H66. 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.

Original language	English
Journal	EPL
Volume	91
Issue number	6
Pages (from-to)	66007
ISSN	0295-5075
DOIs	https://doi.org/10.1209/0295-5075/91/66007
Publication status	Published - 2010

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title = "Localized diffusive motion on two different time scales in solid alkane nanoparticles",

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-C32H66. 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.",

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TY - JOUR

T1 - Localized diffusive motion on two different time scales in solid alkane nanoparticles

AU - Wang, S. K.

AU - Mamontov, E.

AU - Bai, M.

AU - Hansen, Flemming Yssing

AU - Taub, H.

AU - Copley, J.R.D.

AU - Sakai, V.G.

AU - Gasparovic, G.

AU - Jenkins, T.

AU - Tyagi, M.

AU - Herwig, K.W.

AU - Neumann, D.A.

AU - Montfrooij, W.

AU - Volkmann, U.G.

PY - 2010

Y1 - 2010

N2 - 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-C32H66. 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.

AB - 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-C32H66. 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.

U2 - 10.1209/0295-5075/91/66007

DO - 10.1209/0295-5075/91/66007

M3 - Journal article

SN - 0295-5075

VL - 91

SP - 66007

JO - EPL

JF - EPL

IS - 6

ER -

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

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