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

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

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10 Scopus citations

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 ₃₂H₆₆. 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
Article number	66007
Journal	EPL
Volume	91
Issue number	6
DOIs	https://doi.org/10.1209/0295-5075/91/66007
State	Published - Sep 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-C 32H66. 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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doi = "10.1209/0295-5075/91/66007",

language = "English",

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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, F. Y.

AU - Taub, H.

AU - Copley, J. R.D.

AU - Sakai, V. García

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 - 2010/9

Y1 - 2010/9

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-C 32H66. 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-C 32H66. 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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U2 - 10.1209/0295-5075/91/66007

DO - 10.1209/0295-5075/91/66007

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SN - 0295-5075

VL - 91

JO - EPL

JF - EPL

IS - 6

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ER -

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

Abstract

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