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Molecular self-diffusion in the isotropic phase close to the nematic-isotropic transition of the homologous series of para-azoxyanisole

✍ Scribed by S.K. Ghosh; E. Tettamanti

Publisher: Elsevier Science
Year: 1980
Tongue: English
Weight: 236 KB
Volume: 69
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(80)85091-3

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✦ Synopsis

We report the molecular selfdrffusion constant D III the rsotropic phase of the homologous series of paraazo\yankole WAA) measured over a temperature range of about 10 K above the nematrc-rsotroprc transrtron temperature Tc by the variable field gradient spin echo techmque The constant D measured immedrately above Tc (=0.5 K) shows an "odd-even" effect sin&r to that of TC. But the activation energy W derived from the temperature dependence of D appears to show a Mferznt perrodrcrty. Sunilar perrodrcrty 1s also shown by Do (pre-eupcmentral factor) and by W/Tc.

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