Abstract
Mixtures of ammonium decanoate (AmDec) and ammonium perfluoro-octanoate (APFO), in ammonium chloride: ammonium hydroxide buffer at pH 8.8 and an ionic strength of 0.1, were examined by small angle neutron scattering with varying proportions of the two surface active agents. The results indicated that mixed micelles were formed and it is suggested from analysis of the data that these were cylindrical in shape at APFO: AmDec ratios of 2∶1, 1∶1 and 1∶2. At 2∶1 and 1∶1 the micelles were found to contain more APFO than expected on the basis of ideal mixing of the surface active agents in the micelle. At a ratio of 1∶9 the micelles were found to be spherical but larger than those formed from AmDec alone. A speculative model is proposed for the mixed micelle which still, however, allows for segregation between hydrocarbon and fluorocarbon chains within the micelle.
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Burkitt, S.J., Ottewill, R.H., Hayter, J.B. et al. Small angle neutron scattering studies on micellar systems part 2. Mixed systems of ammonium decanoate and ammonium perfluoro-octanoate. Colloid & Polymer Sci 265, 628–636 (1987). https://doi.org/10.1007/BF01412779
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DOI: https://doi.org/10.1007/BF01412779