Pulsed-field-gradient stimulated-spin-echo NMR study of anisotropic self-diffusion in smectic Ad liquid crystal CBOOA

Anisotropic self-diffusion coefficient tensor was determined in the smectic Ad (S Ad) phase of a polar mesogen CBOOA. The pulsed-field-gradient stimulated-spin-echo NMR technique was applied in combination with angular displacement of a quadrupole coil, to obtain the diffusion coefficient components...

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Bibliographic Details
Published in:Chemical physics letters 1993-09, Vol.212 (3), p.277-282
Main Authors: Miyajima, Seiichi, McDowell, A.F., Cotts, R.M.
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Diffusion and ionic conduction in liquids
Exact sciences and technology
Physics
Transport properties of condensed matter (nonelectronic)
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Summary:Anisotropic self-diffusion coefficient tensor was determined in the smectic Ad (S Ad) phase of a polar mesogen CBOOA. The pulsed-field-gradient stimulated-spin-echo NMR technique was applied in combination with angular displacement of a quadrupole coil, to obtain the diffusion coefficient components both parallel ( D |) and perpendicular ( D ⊥) to the director for the sample oriented at the magic angle from the large magnetic field. It was found that D &.sfnc; > D ⊥ ( D |/ D ⊥ = 2.3–3.0), and the activation energies were similar for the two components. Nematic-like diffusion characteristics have been revealed.
ISSN:0009-2614
1873-4448
DOI:10.1016/0009-2614(93)89326-D