Anomaly of Aqueous Solutions of Cationic Surfactants: Quaternary Ammonium Salts

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Other Title
  • 陽イオン性界面活性剤第四級アンモニウム塩の水溶液の示す異常現象について

Description

The equivalent conductances of tetradecyldimethylbenzyl-, octadecyldipolyoxyethylenemethyl-, and dioctadecyldimethylammonium chlorides have been determined. There was no anomaly in the conductance-concentration curve for the aqueous solutions of tetradecyl dimethyl benzylammonium chloride, but that for octadecyldipolyoxyethylenemethylammoniurn chloride showed a maximum at a concentration below the critical micelle concentration. Much lager equivalent conductances of dioctadecyldimethylammonium chloride in very dilute solutions than expected indicate that a maximum is also present. These maxima may be explained as follows. Owing to the steric hindrance of the long-chain substituents of surfactant ions, the counter ions can not form non-conducting ion-pairs with micellar ions and the tendency of surfactant ions to associate with each other is strengthened. Thus, the formation of multi-valent surfactant ions will cause a sharp rise in conductance in dilute solutions.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1974 (12), 2246-2249, 1974-12-10

    The Chemical Society of Japan

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