Surfactant concentration-dependent effects of pH on the interfacial properties of a splittable surfactant

C. M. Chen, C. H. Chang

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


A systematic study was performed to explore the effects of pH on the emulsifying ability and interfacial tension-lowering activity of a commercial splittable surfactant Triton SP-175 at various concentrations. The findings indicate that the addition of inorganic acids had a pronounced influence on the stability of Triton SP-175-stabilized emulsions, and the influence was greatly enhanced with decreasing pH and surfactant concentration. Moreover, the dynamic interfacial tension-lowering activity of the commercial Triton SP-175 surfactant was strongly inhibited by lowering the pH, resulting in a much slower relaxation in dynamic interfacial tension, with the extent depending on the surfactant concentration. However, its equilibrium interfacial tension-lowering activity was only slightly affected by acids. The data demonstrated that dramatic instability of emulsions stabilized by the splittable surfactant Triton SP-175 was induced by acids, along with considerably destroyed dynamic interfacial activity of the surfactant.

Original languageEnglish
Pages (from-to)3726-3731
Number of pages6
JournalIndustrial and Engineering Chemistry Research
Issue number10
Publication statusPublished - 2000

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering


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