Solvent contrast variation study of w/o AOT microemulsions using small-angle neutron scattering

R. Kawai-Hirai, M. Hirai, H. Iwase, S. Arai, M. Imai, Y. Matsushita

Research output: Contribution to journalArticlepeer-review


Recently, we showed that the hydrolysis of some esters catalyzed by α-chymotrypsin entrapped in sodium bis(2-ethylhexyl)sulfosuccinate (AOT) microemulsions is enhanced at low water-surfactant molar ratio W0 (= [H2O]/[AOT]) and that the internal interface structure and the oligomeric phase of the AOT microemulsions below this W0 range would play an important role for the acceleration of the metabolic turnover. To clarify the relation between the appearance of superactivity and the internal structures of the AOT microemulsions, we have carried out small-angle neutron-scattering experiments. In this report, we treat the AOT/water/hexane or heptane system by using solvent-contrast variation method, and we discuss a change of the excluded volume of AOT molecule at low W0 value.

Original languageEnglish
Pages (from-to)984-986
Number of pages3
JournalPhysica B: Condensed Matter
Publication statusPublished - 1997 Jan 1
Externally publishedYes


  • AOT
  • Contrast variation
  • Microemulsion
  • Neutron small-angle scattering

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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