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
✍ Scribed by R. Tanaka; K. Okazaki
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 133 KB
- Volume
- 184
- Category
- Article
- ISSN
- 0021-9797
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✦ Synopsis
Å 15 is due to the symmetric hydration of ions in the Precise determinations of dielectric constants were carried out micellar core (4). This result encouraged us to extend the for Aerosol OT reversed micelles in cyclohexane at a frequency of measurements to the infinitely dilute concentrations and to 1 MHz and at a temperature of 298.15 K for molalities of AOT investigate the properties of water that are essential for formfrom 0 to 0.04 mol kg 01 . The ratio of the amount of water, r, to ing the reversed micelles. For this purpose we have measured that of AOT was varied from 0 to 25 and the apparent dipole dielectric constants e of the system composed of (AOT / moments for the mixed solute (AOT / rrH 2 O) were calculated. rrH 2 O) and cyclohexane by using a stepwise dilution Discontinuous change in the limiting dipole moment with increasing method, and we have determined the apparent dipole mor was found and was related to the characteristic of water to bind ments m of the reversed micelles. to the head group of AOT. The process of forming W/O microemulsion and the molecular interactions in the micellar core are dis-Although many equations have been proposed for the calcussed in terms of the hydration of AOT.