“Snap-Shooting” the Interface of AOT Reverse Micelles: Use of Chemical Trapping

✍ Scribed by Gollapudi Venkata Srilakshmi; Arabinda Chaudhuri

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 136 KB
• Volume: 6
• Category: Article
• ISSN: 0947-6539
• DOI: 10.1002/1521-3765(20000804)6:15<2847::aid-chem2847>3.0.co;2-q

✦ Synopsis

The first use of the phenyl cation trapping technique in ªsnapshootingº the local molar concentrations of water and sulfosuccinate head-groups in the interfacial region of AOT ± 2,2,4trimethylpentane ± water reverse micelles has been accomplished. Our results demonstrate that the interfacial concentrations of the sulfosuccinate head-groups in AOT (0.1m) ± 2,2,4-trimethylpentane ± water reverse micelles are remarkably high (2.75 ± 2.34 m) across the W 0 (the molar ratio of water to surfactant) range 12 to 44. However, the interfacial concentrations of water in AOT ± 2,2,4-trimethylpentane ± water reverse micelles across the same range of solution compositions are significantly lower (27.9 ± 32.0 m) than the molar concentration of bulk water (55.5 m). The present results provide new insight on the microenvironments of interfacially located enzymes such as lipases entrapped in AOT ± 2,2,4-trimethylpentane ± water reverse micelles, the most extensively exploited reverse-micellar system in micellar biotechnology.