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Deuteron Magnetic Relaxation and Molecular Dynamics in ThermTropic Liquid Crystals

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Liquid Crystals and Ordered Fluids

Abstract

It has long been recognized that nuclear spin relaxation provides a convenient and powerful means for studying dynamic processes in ordered fluids. In this paper we discuss some recently developed NMR techniques which can provide novel, more detailed information about molecular motion in liquid crystals via the determination of individual spectral densities of motion. The potential of the techniques will be illustrated by deuterium relaxation data obtained in our laboratory and for reasons of brevity our discussion will be restricted to thermotropic nematic phases. Early work in this field (cf. reviews by Wade (1) and Doane (2)) was devoted mainly to measuring the interpreting overall spin-lattice relaxation rates of protons, taking advantage of the fact that numerous slow processes characteristic of the ordered medium possess strong Fourier components fluctuating near the Larmor frequency. A partial list of such processes includes the familiar fluctuations of nematic director orientation (3,4), translational self-diffusion (5,6), quasi-critical fluctuations of local order near phase transitions (7), and slow relaxation of local structures (8,9). Numerous refinements of the original model calculations have appeared, especially for order-director fluctuations (ODF): detailed expressions are available for now with a high frequency cutoff included in the mode expansion (10), for ODF with the director aligned at an arbitrary angle with respect to the magnetic field (11–13), for the combined effects of fast reorientation and ODF (9,12,14) including controversial cross-terms, and for the effect of anisotropic elastic coefficients and viscosities (15).

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Author information

Authors and Affiliations

  1. Department of Chemistry, University of California, San Diego La Jolla, California, 92093, USA

    Regitze R. Vold & Robert L. Vold

Authors
  1. Regitze R. Vold
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  2. Robert L. Vold
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Editor information

Editors and Affiliations

  1. University of Southern Mississippi, Hattiesburg, Mississippi, USA

    Anselm C. Griffin

  2. University of Connecticut, Storrs, Connecticut, USA

    Julian F. Johnson

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© 1984 Plenum Press, New York

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Vold, R.R., Vold, R.L. (1984). Deuteron Magnetic Relaxation and Molecular Dynamics in ThermTropic Liquid Crystals. In: Griffin, A.C., Johnson, J.F. (eds) Liquid Crystals and Ordered Fluids. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-2661-8_34

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  • DOI: https://doi.org/10.1007/978-1-4613-2661-8_34

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4612-9658-4

  • Online ISBN: 978-1-4613-2661-8

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