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

Research output: Contribution to journalArticle (Academic Journal)

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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.

Original languageEnglish
Pages (from-to)593-607
Number of pages15
JournalMolecular Physics
Volume93
Issue number4
DOIs
Publication statusPublished - 1 Mar 1998

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    Belushkin, A., Cook, M. J., Frezzato, D., Haslam, S. D., Ferrarini, A., Martin, D., McMurdo, J., Nordio, P. L., Richardson, R. M., & Stafford, A. (1998). A quasi-elastic neutron scattering study of molecular dynamics in a columnar liquid crystal. Molecular Physics, 93(4), 593-607. https://doi.org/10.1080/002689798168925