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Colloid and Polymer Science

, Volume 297, Issue 2, pp 183–189 | Cite as

Interfacial behavior of gemini surfactants with different spacer lengths in aqueous medium

  • Hiromichi Nakahara
  • Ayami Nishino
  • Ayaka Tanaka
  • Yoshika Fujita
  • Osamu ShibataEmail author
Original Contribution
  • 88 Downloads

Abstract

A series of alkanediyl-1-s-bis(dimethyltetradecylammonium bromide) (abbr. 14-s-14,2Br) has been characterized in an aqueous medium at temperatures of 288.2, 298.2, and 308.2 K. Critical micelle concentration (cmc) of the surfactants was determined by measuring the surface tension and electrical conductivity as a function of concentrations. The micelle formation was elucidated thermodynamically from the results of electrical conductivity measurement. A steady-state fluorescence quenching and dynamic light scattering were performed to determine the aggregation number and the size of micelles, respectively. Furthermore, the surface potential (ΔV) was measured against surfactant concentrations to understand the condensing state of the adsorbed layer located at the air–water interface. The ΔV value directly can catch a vertical unequal shift of electric charges in the surface region above the bulk where the ΔV value is zero or electroneutrality is held. The results of ΔV measurements indicated that the adsorbed surfactants in the surface region were saturated in terms of amounts far below the cmc and that the vertical orientation of tetradecyl chains of 14-s-14,2Br was improved by the longer spacers in a bending conformation towards the air.

Keywords

Gemini surfactant Surface potential Surface tension Conductivity Steady-state fluorescence quenching Dynamic light scattering 

Notes

Acknowledgements

This work was supported by a Grant-in-Aid for Scientific Research 16K08216 from the Japan Society for the Promotion of Science (JSPS).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

396_2018_4459_MOESM1_ESM.doc (145 kb)
ESM 1 (DOC 145 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Hiromichi Nakahara
    • 1
  • Ayami Nishino
    • 1
  • Ayaka Tanaka
    • 2
  • Yoshika Fujita
    • 2
  • Osamu Shibata
    • 2
    Email author
  1. 1.Department of Industrial PharmacyDaiichi University of PharmacyFukuokaJapan
  2. 2.Department of Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Faculty of Pharmaceutical SciencesNagasaki International UniversitySaseboJapan

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