Structure functions and interfacial mean curvatures in a ternary amphiphilic system C12E5/water/n-octane

S. K. Ghosh, S. Komura, H. Seto, J. Matsuba, T. Takeda, M. Kokosaka, M. Imai

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Partial structure functions and mean curvatures of a ternary amphiphilic system consisting of water, n-octane and nonionic amphiphile C12E5 with equal volume fraction of oil and water have been studied by means of small-angle neutron scattering (SANS). Isotopic contrast variation technique was used to obtain suitable scattering contrasts of oil and water. We observed that the cross partial structure functions, that arise from the correlation between water-surfactant or oil-surfactant, change sign when the temperature passes through the hydrophilelipophile balance (HLB) point. It indicates that the interaction parameter C of the spin-lattice model invert on HLB line. We have calculated mean curvatures considering that water or oil molecules can partially penetrate into the surfactant film. Experimental results show that mean curvatures increase as the temperature increases at a rate of 1.5 × 10-3-1 K-1).

Original languageEnglish
Pages (from-to)98-103
Number of pages6
JournalProgress in Colloid and Polymer Science
Publication statusPublished - 1997 Jan 1
Externally publishedYes


  • Amphiphile
  • Lamella
  • Mean curvature
  • Microemulsion
  • Partial structure function

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Polymers and Plastics
  • Colloid and Surface Chemistry
  • Materials Chemistry


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