VOLUME AND HEAT-CAPACITY OF SODIUM DODECYL-SULFATE DODECYLDIMETHYLAMINE OXIDE MIXED MICELLES
VOLUME AND HEAT-CAPACITY OF SODIUM DODECYL-SULFATE DODECYLDIMETHYLAMINE OXIDE MIXED MICELLES
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DOI：
10.1021/j100128a028
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发表时间：
1993-07-01
影响因子：
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通讯作者：
MILIOTO, S
中科院分区：
文献类型：
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作者：
BAKSHI, MS;CRISANTINO, R;MILIOTO, S
在25℃下测量了十二烷基硫酸钠(NaDS)-十二烷基二甲胺氧化物（DDAO）混合物的表面张力、热容量和密度作为总质量摩尔浓度的函数。根据表面张力数据得出的临界胶束浓度（cmc）作为混合物组成（X(NaDS)）的函数，与理想行为呈负向偏离。根据密度和热容数据计算混合物的表观摩尔体积（V(PHI,2)）和热容（C(PHI,2)）。在给定的X（NaDS）下，V（PHI,2）随着总质量摩尔浓度的增加而趋于恒定值。在C（PHI,2）的情况下，情况正好相反。在给定的混合物组成下，根据伪相转变模型评估了混合胶束（Y2，M）的偏摩尔性质。这是通过将胶束后区域的部分摩尔性质外推到cmc来完成的。作为混合胶束组成函数的V2，M与理想行为呈负偏差，而Cp2，M为零偏差。在正则解理论的基础上讨论了这些性质。
Surface tension, heat capacity, and density of the sodium dodecyl sulfate (NaDS)-dodecyldimethylamine oxide (DDAO) mixtures have been measured at 25-degrees-C as functions of the total molality. The critical micelle concentration (cmc), derived from surface tension data, as a function of the mixture composition (X(NaDS)) deviates negatively from the ideal behavior. The apparent molar volumes (V(PHI,2)) and heat capacities (C(PHI,2)) Of the mixture were calculated from density and heat capacity data. At a given X(NaDS), V(PHI,2) increases with the total molality tending to a constant value. In case of C(PHI,2) the behavior is opposite. At a given mixture composition, the partial molar property of the mixed micelles (Y2,M) was evaluated on the basis of the pseudophase transition model. This was done by extrapolating the partial molar property in the postmicellar region to the cmc. The V2,M as a function of the mixed micelle composition deviates negatively from the ideal behavior while Cp2,M shows a null deviation. These properties are discussed on the basis of the regular solution theory.