Composition of the sodium dodecylsulfate – 1-pentanol mixed micelles as determined using acid-base indicators
Abstract
The composition of mixed surfactant–alcohol micelles is governed by the parameters of alcohol partition between the aqueous and micellar phases. In this paper, the indicator method of determination of 1‑pentanol molar fraction in the mixed sodium n-dodecylsulfate – 1-pentanol micelles and the partition constant of the alcohol is reported. This method relies on the determination of the apparent ionization constants, Kaapp, of acid-base indicators. The electrical surface potential is equal to –58 mV and –39 mV for entire and mixed micelles, respectively, as evaluated using pKaapp values of the indicato N,N’-di-n-octadecylrhodamine. In terms of the slope of the dependence of pKaapp vs. log[Naw+] for the indicator neutral red, the degree of counter-ion binding in entire surfactant micelles, β, equals 0.71 ± 0.02, whereas the corresponding value at 0.20 M 1-pentanol is substantially lower, β’ = 0.52 ± 0.03. The β, β’, and Ψ values allow estimating the molar fraction of 1-pentanol in the mixed micelles using the Ohshima–Healy–White equation. Finally, the partition constant of the 1-pentanol between the aqueous phase and micelles is determined as K = 10.3 M−1 and 15.4 M−1 in terms of the spherical and cylindrical model of mixed micelles, respectively. These values are accorded with the corresponding data obtained by other methods.
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