The Promotion of Alkaline Fading of Crystal Violet by AOT Micelles Dispersed in Supercritical Ethane Medium
✍ Scribed by Yutaka Ikushima; Zameer Shervani; Norio Saito; Masahiko Arai
- Book ID
- 102580366
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 120 KB
- Volume
- 191
- Category
- Article
- ISSN
- 0021-9797
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✦ Synopsis
ter-head group interaction in aggregates. This may lead to The alkaline fading of crystal violet (CV) is accelerated by using the control of catalytic actions of AOT reverse microemula w/o microemulsion of H 2 O/AOT/ethane under supercritical sions by changing pressure and temperature. In the present conditions. The rate of fading can be changed by three orders of work, we tried to use supercritical ethane as a continuous magnitude with the molar ratio of water to AOT and operating phase for AOT micelles and studied a chemical reaction pressure. The highest rate of CV fading observed is larger by a in such a H 2 O/AOT/ethane microemulsion, selecting the factor of 100 or more compared to those reported so far in the alkaline fading of CV (Scheme 1) as a first test reaction. literature. The structure of AOT molecules and the type of interior The effects of pressure and molar ratio of water to AOT water molecules seem to account for the rate enhancement with (W ) on the rate of the fading were measured at a constant an increase in the water/AOT molar ratio. It is suggested that the intermicellar and AOT-ethane interactions are of significance for temperature. It is noteworthy that the rate of fading changes the promotion effect of pressure. ᭧ 1997 Academic Press by three orders of magnitude with operating variables and Key Words: AOT micelles; supercritical ethane; w/o microemulthe highest rate observed is much higher than those obtained sion; crystal violet; alkaline fading.
under normal conditions.
In addition, to shed light on causes of the rate enhancement observed, the structures of AOT and water molecules