Kolloid-Zeitschrift und Zeitschrift für Polymere

, Volume 220, Issue 2, pp 152–159 | Cite as

Electrocapillary phenomena at oil-water interfaces

Part 1. electrocapillary curves of oil-water systems containing surface active agents
  • Akira Watanabe
  • Mutsuo Matsumoto
  • Hisako Tamai
  • Rempei Gotoh
Originalarbeiten Kolloide

Summary

The electrocapillary phenomena at oil-water interfaces, i. e. the change in the interfacial tension with an applied potential difference, take place over a moderate polarization range of ca. 20 to −20 V, when the systems have sufficiently high electric conductance and contain surface active agents. Experiments were carried out in the presence of potassium chloride in the aqueous phase and ionic surface active agents in the oil phase, respectively. It was found that the interfacial tension was suppressed over the cathodic or anodic polarization range, depending on whether the surface active agent used was cationic or anionic, respectively. Here the sign of polarization was conventionally taken as that of the water phase with respect to the oil phase. It was then concluded by the use of theLippmann-Helmholtz equation that the water side of the interface is charged positively or negatively in the respective case mentioned above. It appears that this charge is due to the counter ion layer which is formed corresponding to the adsorption of ionic surface active agents on the oil side.

Keywords

Interfacial Tension High Electric Conductance Potassium Chloride Anodic Polarization Surface Active Agent 

Zusammenfassung

Die Elektrokapillarität von Öl-Wasser-Grenzflächen mit Kaliumchlorid in den wässerigen und grenzflächenaktiven Ionen in der Ölphase wurde bei geringer Polarisation im Bereich von +20 V bis −20 V untersucht. Dabei wurde beobachtet, daß die Grenzflächenspannung durch kationische bzw. anionische Polarisation erniedrigt wurde, je nachdem, ob die grenzflächenaktiven Stoffe kationisch oder anionisch waren. Die Ergebnisse wurden mit Hilfe derLippmann-Helmholtz-Gleichung gedeutet. Es bildet sich eine elektrische Doppelschicht mit den grenzflächenaktiven Ionen an der Ölschicht und den anorganischen Gegenionen an der wässerigen Seite der Grenzfläche.

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Copyright information

© Dr. Dietrich Steinkopff Verlag 1967

Authors and Affiliations

  • Akira Watanabe
    • 1
  • Mutsuo Matsumoto
    • 1
  • Hisako Tamai
    • 1
  • Rempei Gotoh
    • 1
  1. 1.Institute for Chemical ResearchKyoto UniversityOsaka-fu(Japan)

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