Proton spin-lattice relaxation in nematic microdroplets

The frequency and temperature dependences of the proton spin–lattice relaxation rate have been studied in nematic droplets embedded in a solid polymer matrix. The comparison of these data to those for bulk nematic and pure polymer samples shows that cross-relaxation between liquid crystal and polyme...

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Bibliographic Details
Published in:The Journal of chemical physics 1988-07, Vol.89 (1), p.597-604
Main Authors: VILFAN, M, RUTAR, V, ZUMER, S, LAHAJNAR, G, BLINC, R, DOANE, J. W, GOLEMME, A
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Liquid crystals
Physics
Structure of solids and liquids
crystallography
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Summary:The frequency and temperature dependences of the proton spin–lattice relaxation rate have been studied in nematic droplets embedded in a solid polymer matrix. The comparison of these data to those for bulk nematic and pure polymer samples shows that cross-relaxation between liquid crystal and polymer protons dominates the liquid crystal relaxation in the MHz frequency region, while at low frequencies the translationally induced molecular rotation becomes important. The cross-relaxation rate is found to be ≈103 s−1 giving an order of magnitude estimate 10−4–10−3 s for the time for which a liquid crystal molecule is bonded to the surface.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.455451