Ramping of pH Across the Water-Pool of a Reverse Micelle

Puspal Mukherjee, Shradhey Gupta, Shahnawaz Rafiq, Rajeev Yadav, Vipin Kumar Jain, Jayraj Raval, Pratik Sen

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

In this work, we have addressed the problem of "acidit" of the water-pool of a reverse micelle (RM) through the well-known inversion of sucrose reaction as a tool of investigation. This reaction has been performed inside positively and negatively charged RM and the rates are compared with that in bulk water. We propose that the buffer-like action in a water-pool is much stronger than expected earlier. The rate of sucrose hydrolysis slowed down in the negatively charged AOT reverse micelle while it sped up for the positively charged CTAB reverse micelle. However, temperature-dependent measurements showed that the activation energy remained the same for all the cases. It has been concluded that a proton gradient exists inside the water-pool of the reverse micelle and it determines the buffer-like action of the water-pool that persists until about 2 N of HCl in AOT RM of w0 = 10.5.

Original languageEnglish
Pages (from-to)1693-1699
Number of pages7
JournalLangmuir
Volume32
Issue number7
DOIs
StatePublished - Feb 23 2016

Bibliographical note

Publisher Copyright:
© 2016 American Chemical Society.

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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