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Determination of pH in reversed micelles

II. Application of the method proposed previously to other reversed micellar systems

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Abstract

The pH in the reversed micellar system of di(ethylhexyl) sodium sulfosuccinate (Aerosol OT, AOT) / phosphate buffer solutions/octane was determined by a P-NMR technique, and pHs in the reversed micelles containing buffer solutions other than the phosphate buffer solution were measured by the spectrophotometric method with the aid of Phenol Red. pHs in reversed micelles were found to be substantially determined by the buffer capacity of buffer solutions solubilized into the systems. By means of both the methods, pKa of Phenol Red in the systems was found to be 7.7, which is almost consistent with that in water. Analysis of Na-NMR spectra indicates that the mobility of the sodium ion of AOT is independent of the molar ratio of water to AOT when the ratio is above 7 and is restricted strongly by the interaction with the sulfonate group of AOT. The relationship between pH and the mobility of the sodium ion was discussed on the basis of the data of Na-NMR spectra.

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Author notes

  1. H. Fujii & T. Kawai

    Present address: Department of Polymer Technology, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo, Japan

  2. H. Nishikawa

    Present address: Department of Physiology, Kyoto Prefectural University of Medicine, Kyoto, Japan

Authors and Affiliations

  1. Department of Polymer Technology, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo, Japan

    H. Nishikawa & G. Ebert

  2. Marburg/Marbach

    G. Ebert

Authors
  1. H. Fujii
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  2. T. Kawai
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  3. H. Nishikawa
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  4. G. Ebert
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Fujii, H., Kawai, T., Nishikawa, H. et al. Determination of pH in reversed micelles. Colloid & Polymer Sci 260, 697–701 (1982). https://doi.org/10.1007/BF01414656

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  • DOI: https://doi.org/10.1007/BF01414656

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