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- W2491739999 abstract "Abstract In this paper, we report the properties of sodium dodecyl sulfate – 1-butanol mixed micelles. The ionic equilibrium of a series of indicator dyes with different charge types, neutral red, methyl yellow, n-decylfluorescein, N,N/-di-n-octadecylrhodamine, quinaldine red, pinacyanol, pseudoisocyanine, and the standard solvatochromic Reichardt’s dye were studied in SDS micellar solutions in water, in the presence of 0.80 M n-C4H9OH. The apparent ionization constants, K a app , of the indicators are substantially influenced by additions of 1-butanol; the decrease in the p K a app values is within the range of 0.24–1.84. Both entire SDS micelles and mixed SDS – 1-butanol aggregates display expressed differentiating influence on the acid-base properties of the attached indicator dyes; the p K a app – p K a (in water) values vary from +2.65 to −1.60 in SDS micelles and from +1.53 to −1.85 in the mixed surfactant–alcohol aggregates. Whereas the slope of the p K a app dependence of neutral red vs. log [ N a w + ] allowed estimating the degree of counter-ion binding in entire SDS micelles, β = 0.71 ± 0.02, the corresponding value is β ′ = 0.39 ± 0.03 at 0.80 M n-C4H9OH indicates the decrease in the interfacial concentration of the anionic head groups within the Stern layer. The electrical potential Ψ of the Stern layer becomes less negative by 26 mV, as evaluated using the indicator N,N/-di-n-octadecylrhodamine. The above Ψ and β values have been used for calculating the molar fraction of 1-butanol in the mixed micelles and the partition constant of the alcohol between the aqueous phase and micelles. The value of the last parameter is in line with the literature data obtained by independent approaches." @default.
- W2491739999 created "2016-08-23" @default.
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- W2491739999 date "2016-10-01" @default.
- W2491739999 modified "2023-09-26" @default.
- W2491739999 title "The properties and composition of the SDS – 1-butanol mixed micelles as determined via acid-base indicators" @default.
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- W2491739999 doi "https://doi.org/10.1016/j.colsurfa.2016.08.004" @default.
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