Apparent Dipole Moments of Aerosol OT Reversed Micelles in Cyclohexane Determined at a Frequency of 1 MHz and at a Temperature of 298.15 K

Authors: Tanaka R.; Okazaki K.

Source: Journal of Colloid and Interface Science, Volume 184, Number 2, December 1996 , pp. 601-606(6)

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Abstract:

Precise determinations of dielectric constants were carried out for Aerosol OT reversed micelles in cyclohexane at a frequency of 1 MHz and at a temperature of 298.15 K for molalities of AOT from 0 to 0.04 mol kg -1 . The ratio of the amount of water, r , to that of AOT was varied from 0 to 25 and the apparent dipole moments for the mixed solute (AOT + r ?H 2 O) were calculated. Discontinuous change in the limiting dipole moment with increasing r was found and was related to the characteristic of water to bind to the head group of AOT. The process of forming W/O microemulsion and the molecular interactions in the micellar core are discussed in terms of the hydration of AOT.

Keywords: dielectric constant; dipole moments; microemulsions; reversed micelles

Language: English

Document Type: Research article

Affiliations: Faculty of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka, 558, Japan

Publication date: 1996-12-01