Accession Number : AD0642606

Title :   ELECTRIC FIELD EFFECT ON THE CRITICAL OPALESCENCE. II. RELAXATION TIMES OF CONCENTRATION FLUCTUATIONS.

Descriptive Note : Technical rept.,

Corporate Author : CORNELL UNIV ITHACA N Y DEPT OF CHEMISTRY

Personal Author(s) : Debye,P. ; Gravatt,C. C. ; Ieda,M.

Report Date : 15 NOV 1966

Pagination or Media Count : 22

Abstract : In an investigation of the effect of electrical fields on the critical opalescence, time dependent phenomena were observed which are related to theoretical relaxation times of concentration fluctuations for a binary mixture. Rectangular DC pulses of 25 to 60 Kvolt/cm and 10 to 200 microsec. duration were applied to a critical mixture of nitrobenzene and 2,2,4-trimethylpentane at a series of temperatures above the critical solution temperature. Relaxation times associated with the change in the transmitted light intensity were found to be independent of the pulse width and the field strength. The relaxation times are proportional to (T - Tc) to the -0.9 power and have magnitudes comparable to relaxation times determined from the frequency broadening of light scattered from similar binary systems. It was also possible to extend the agreement between the Debye theory and the experimental results to within 0.1C of Tc. (Author)

Descriptors :   (*SOLUTIONS(MIXTURES), *OPTICAL PHENOMENA), (*ELECTRIC FIELDS, SOLUTIONS(MIXTURES)), CONCENTRATION(CHEMISTRY), RELAXATION TIME, NITROBENZENES, ALKANES, MIXTURES, ELECTROMAGNETIC PULSES, LIGHT, SCATTERING

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE