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

✍ Scribed by Seiichi Miyajima; A.F. McDowell; R.M. Cotts

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 476 KB
• Volume: 212
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(93)89326-d

✦ Synopsis

Anisotropic self-diffusion coefficient tensor was determined in the smectic Ad (S,) 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 coef&ient components both parallel (D,) and perpendicular (01) to the director for the sample oriented at the magic angle from the large magnetic field. It was found that D, >D, (Dr/Dl =2.3-3.0), and the activation energies were similar for the two components. Nematic-like diffusion characteristics have been revealed.