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

16 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

Access to Document

10.1080/002689798168925

Handle.net

Persistent link

Cite this

@article{cd97603c3930442e8b444e87b8ab2dc0,

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,

day = "1",

doi = "10.1080/002689798168925",

language = "English",

volume = "93",

pages = "593--607",

journal = "Molecular Physics",

issn = "0026-8976",

publisher = "Taylor & Francis Group",

number = "4",

}

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 - http://www.scopus.com/inward/record.url?scp=0001441689&partnerID=8YFLogxK

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

Abstract

Access to Document

Handle.net

Other files and links

Fingerprint

Cite this