Thermodynamics of aqueous mixtures of polyoxyethene glycol monoethers V. Excess molar volumes of (n-decyl hexaoxyethene glycol monoether + water) in the vicinity of the critical micelle composition

Author： Wieczorek S.A.

Publisher： Academic Press

ISSN： 0021-9614

Source： Journal of Chemical Thermodynamics, Vol.31, Iss.5, 1999-05, pp. : 661-673

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Abstract

Excess molar volumes of an aqueous solution of non-ionic surfactant n-decyl hexaoxyethene glycol monoether, { CH₃(CH₂)₉O (CH₂CH₂O)₆H}, or (C₁₀E₆), have been investigated as a function of composition x and temperature. The measurements in the high dilute region, i.e. the region in the vicinity of the critical micelle composition (c.m.c.), have been made at the temperatures (298.144, 308.141, and 318.143) K. In this study V_m^Eis negative and increases with temperature;V_m^E(x) changes slope at x = (1.5, 1.3, and 1.2)· 10^-5at the temperatures (298.144, 308.141, and 318.143) K, respectively. The investigations over the whole range of x have been carried out at the temperature 298.144 K at which the aqueous solution of C₁₀E₆in the range of x between 0.0283 and 0.0734 creates lyotropic liquid crystals. The results for V_m^Ehave been fitted to an association model and the values of the aggregation number N ,ΔV_m,micell, and the critical micelle composition have been determined.