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Nuclear Spin Relaxation Mechanisms in Liquid Crystals Studied by Field Cycling NMR

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The Molecular Dynamics of Liquid Crystals

Part of the book series: NATO ASI Series ((ASIC,volume 431))

Abstract

As first discussed by Pincus and by Blinc et al., fluctuations of the director in a nematic liquid crystal should lead to a characteristic square root dependence of the nuclear magnetic relaxation time T, of a liquid crystal on the Larmor frequency of the considered nuclear spin. The significance of this process in nematics and of related mechanisms in smectics is violently disputed in the literature, essentially because standard NMR spectrometers do not allow a sufficiently broad frequency variation. In this Chapter we first illustrate the present capabilities of field cycling methods to perform frequency dependent T, measurements over a range from about 100 Hz to 10 MHz, and then review the results of proton and deuteron spin relaxation dispersion measurements for numerous nematic and smectic liquid crystals. As a rule it is found that director fluctuations are clearly observable by the relaxation rate only at low Larmor frequencies, i.e., far below the standard megahertz regime.

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Authors and Affiliations

  1. Physikalisches Institut der Universität Stuttgart, Pfaffenwaldring 55 Stuttgart 80, D-7000, Germany

    F. Noack & K. H. Schweikert

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  1. F. Noack
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  2. K. H. Schweikert
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Editors and Affiliations

  1. Department of Chemistry, University of Southampton, UK

    G. R. Luckhurst

  2. Department of Chemistry and Industrial Chemistry, University of Pisa, Italy

    C. A. Veracini

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Noack, F., Schweikert, K.H. (1994). Nuclear Spin Relaxation Mechanisms in Liquid Crystals Studied by Field Cycling NMR. In: Luckhurst, G.R., Veracini, C.A. (eds) The Molecular Dynamics of Liquid Crystals. NATO ASI Series, vol 431. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1168-3_10

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  • DOI: https://doi.org/10.1007/978-94-011-1168-3_10

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-4509-4

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