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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Mixtures of Nonionic and Ionic Surfactants: Determination of Mixed Micelle Composition Using Cross-Differentiation Relations
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Mixtures of Nonionic and Ionic Surfactants: Determination of Mixed Micelle Composition Using Cross-Differentiation Relations

机译:非离子和离子表面活性剂的混合物:使用交叉微分关系测定混合胶束组成

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Cross-differentiation relations are used in thermodynamics to describe the behavior of cationic and nonionic surfactants in mixed micelles. This study uses dodecyltrimethylammonium bromide (DTABr) as cationic surfactant and dodecylpoly(oxyethylene glycol ether)_(23) or BRIJ 35, as nonionic surfactant. One of these cross-differentiation relation allows us to connect the nonionic surfactant activity with that of the cationic surfactant by following the variations of DTABr molality with BRIJ 35 molality, at constant DTABr chemical potential. This was possible with a reliable DTA~+-selective electrode. We show that this approach gives access to the activity of nonionic species in solution and into the micelle from potentiometric measurements.
机译:交叉差异关系用于热力学,以描述混合胶束中阳离子和非离子表面活性剂的行为。本研究使用十二烷基三甲基溴化铵(DTABr)作为阳离子表面活性剂,十二烷基聚(氧乙二醇醚)_(23)或BRIJ 35作为非离子表面活性剂。这些交叉差异关系之一使我们能够通过在恒定DTABr化学势下跟踪DTABr摩尔浓度与BRIJ 35摩尔浓度的变化来将非离子表面活性剂活性与阳离子表面活性剂的活性联系起来。使用可靠的DTA〜+选择电极可以做到这一点。我们表明,这种方法可以访问非离子物质在溶液中的活性,并可以通过电位测量法进入胶束。

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