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Colloid chemical properties of ampholytic surfactants

II. The critical micelle concentration and micellar weight of octylbetaine

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Summary

The critical micelle concentrations of octylbetaine and N-octylbetaine were determined by three independent techniques; surface tension, density and light-scattering measurements. The values obtained were 0.097, 0.125, 0.120 mole/l for octylbetaine and 0.250, 0.250, 0.217 mole/l for N-octylbetaine. The micellar weights of these surfactants were estimated from the light-scattering data. These were 7.04×103 for the former and 5.10×103 for the latter.

Zusammenfassung

Die kritischen Mycellkonzentrationen von Octylbetain und N-Octylbetain wurden auf drei unabhängige Weisen bestimmt. durch Messung der Oberflächenspannung, Dichte und Lichtstreuung. Die erhaltenen Werte sind 0,097, 0,125, 0,120 Mol/l für Octylbetain und 0,250, 0,250, 0,217 Mol/l für N-Octylbetain. Die Mycellargewichte dieser grenzflächenaktiven Substanzen lassen sich aus der Lichtstreuung abschätzen. Sie betragen 7,04 · 103 für die erstere und 5,10 · 103 für die letztere Substanz.

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Author notes

  1. K. Tori & T. Nakagawa

    Present address: Research Laboratory, Shionogi & Co., Fukushima-ku, Osaka, Japan

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    1. K. Tori
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    2. T. Nakagawa
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    Tori, K., Nakagawa, T. Colloid chemical properties of ampholytic surfactants. Kolloid-Z.u.Z.Polymere 188, 47–52 (1963). https://doi.org/10.1007/BF01499603

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    • DOI: https://doi.org/10.1007/BF01499603

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