A quasi-elastic neutron scattering study of molecular dynamics in a columnar liquid crystal

A. Belushkin; M. J. Cook; D. Frezzato; S. D. Haslam; A. Ferrarini; D. Martin; J. McMurdo; P. L. Nordio; R. M. Richardson; A. Stafford

doi:10.1080/002689798168925

A quasi-elastic neutron scattering study of molecular dynamics in a columnar liquid crystal

A. Belushkin
, M. J. Cook
, D. Frezzato
, S. D. Haslam
, A. Ferrarini
, D. Martin
, J. McMurdo
, P. L. Nordio
, R. M. Richardson
, A. Stafford

University of Bristol Law School

Research output: Contribution to journal › Article (Academic Journal) › peer-review

18 Citations (Scopus)

Abstract

The incoherent quasi-elastic neutron scattering from the heptyl and octyl derivatives of the acta-alkylphthalocyanines, CnPcH₂, in their crystalline and liquid crystalline (discotic columnar) phases has been measured. Diffusive motion is observed on the 10^-10 to 10^-12 s timescale. This is interpreted as alkyl chain motion. A detailed comparison of the mesophase data for C7PcH₂ has been made with the predictions of the rotational isomeric state model, and an 2 extra motion on this timescale has been invoked, which probably is a localized translational motion. A small discontinuity in the elastic fraction of the quasi-elastic scattering is consistent with a change in the molecular tilt at the transition between the two D_hd phases.

Original language	English
Pages (from-to)	593-607
Number of pages	15
Journal	Molecular Physics
Volume	93
Issue number	4
DOIs	https://doi.org/10.1080/002689798168925
Publication status	Published - 1 Mar 1998

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title = "A quasi-elastic neutron scattering study of molecular dynamics in a columnar liquid crystal",

abstract = "The incoherent quasi-elastic neutron scattering from the heptyl and octyl derivatives of the acta-alkylphthalocyanines, CnPcH2, in their crystalline and liquid crystalline (discotic columnar) phases has been measured. Diffusive motion is observed on the 10-10 to 10-12 s timescale. This is interpreted as alkyl chain motion. A detailed comparison of the mesophase data for C7PcH2 has been made with the predictions of the rotational isomeric state model, and an 2 extra motion on this timescale has been invoked, which probably is a localized translational motion. A small discontinuity in the elastic fraction of the quasi-elastic scattering is consistent with a change in the molecular tilt at the transition between the two Dhd phases.",

author = "A. Belushkin and Cook, \{M. J.\} and D. Frezzato and Haslam, \{S. D.\} and A. Ferrarini and D. Martin and J. McMurdo and Nordio, \{P. L.\} and Richardson, \{R. M.\} and A. Stafford",

year = "1998",

month = mar,

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doi = "10.1080/002689798168925",

language = "English",

volume = "93",

pages = "593--607",

journal = "Molecular Physics",

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TY - JOUR

T1 - A quasi-elastic neutron scattering study of molecular dynamics in a columnar liquid crystal

AU - Belushkin, A.

AU - Cook, M. J.

AU - Frezzato, D.

AU - Haslam, S. D.

AU - Ferrarini, A.

AU - Martin, D.

AU - McMurdo, J.

AU - Nordio, P. L.

AU - Richardson, R. M.

AU - Stafford, A.

PY - 1998/3/1

Y1 - 1998/3/1

N2 - The incoherent quasi-elastic neutron scattering from the heptyl and octyl derivatives of the acta-alkylphthalocyanines, CnPcH2, in their crystalline and liquid crystalline (discotic columnar) phases has been measured. Diffusive motion is observed on the 10-10 to 10-12 s timescale. This is interpreted as alkyl chain motion. A detailed comparison of the mesophase data for C7PcH2 has been made with the predictions of the rotational isomeric state model, and an 2 extra motion on this timescale has been invoked, which probably is a localized translational motion. A small discontinuity in the elastic fraction of the quasi-elastic scattering is consistent with a change in the molecular tilt at the transition between the two Dhd phases.

AB - The incoherent quasi-elastic neutron scattering from the heptyl and octyl derivatives of the acta-alkylphthalocyanines, CnPcH2, in their crystalline and liquid crystalline (discotic columnar) phases has been measured. Diffusive motion is observed on the 10-10 to 10-12 s timescale. This is interpreted as alkyl chain motion. A detailed comparison of the mesophase data for C7PcH2 has been made with the predictions of the rotational isomeric state model, and an 2 extra motion on this timescale has been invoked, which probably is a localized translational motion. A small discontinuity in the elastic fraction of the quasi-elastic scattering is consistent with a change in the molecular tilt at the transition between the two Dhd phases.

UR - https://www.scopus.com/pages/publications/0001441689

U2 - 10.1080/002689798168925

DO - 10.1080/002689798168925

M3 - Article (Academic Journal)

AN - SCOPUS:0001441689

SN - 0026-8976

VL - 93

SP - 593

EP - 607

JO - Molecular Physics

JF - Molecular Physics

IS - 4

ER -

A quasi-elastic neutron scattering study of molecular dynamics in a columnar liquid crystal

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