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13C-NMR Evidence on Amphiphile Lifetime in Reverse (Water-in-Oil) Micelles Formed by a Poloxamer Block Copolymer

Authors
Journal
Journal of Colloid and Interface Science
0021-9797
Publisher
Elsevier
Publication Date
Volume
206
Issue
1
Identifiers
DOI: 10.1006/jcis.1998.5702
Keywords
  • Reverse Micelles
  • Dynamics
  • 13C-Nmr
  • Block Copolymer
  • Poloxamer
  • Poly(Ethylene Oxide)
  • Poly(Propylene Oxide)

Abstract

Abstract The dynamics of exchange between amphiphile assembled in reverse (water-in-oil) micelles and unimer (free in solution) amphiphile were probed by 13C-NMR spectroscopy in a ternary isothermal system consisting of a poly(ethylene oxide)-poly(propylene oxide) block copolymer (poloxamer), water, and xylene. An upper bound was obtained for the lifetime of a block copolymer molecule within the reverse micelle, using the theoretical treatment of exchange phenomena in NMR which is based on extensions of the Bloch equations.

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