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首页> 外文期刊>Colloids and Interfaces >Micellar Parameters of Aqueous Solutions of Tween 20 and 60 at Different Temperatures: Volumetric and Viscometric Study
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Micellar Parameters of Aqueous Solutions of Tween 20 and 60 at Different Temperatures: Volumetric and Viscometric Study

机译：吐温20和60在不同温度下水溶液的胶束参数：体积和粘度研究

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摘要

Density, viscosity and speed of sound of aqueous solutions of nonionic surfactants such as polyoxyethylene (20) sorbitan monolaurate (Tween 20) and polyoxyethylene (20) sorbitan monostearate (Tween 60) at T = 293, 303 and 313 K are reported. From these measured values different parameters such as, for example, isentropic compressibility, molecular free length, acoustic impedance, primary hydration numbers and internal pressure have been calculated and employed to discuss molecular packing, structural alteration and molecular interactions. The variation in these parameters with temperature indicates that the mobility of surfactant molecules increases the disordered state of the liquid (surfactant + water) due to irregular packing of the molecules. Also, for Tween 20 solutions, more conversion to bulk water of the structured water molecules was observed, obtaining lower compressibilities and higher values of hydration numbers as well as internal pressure for a given T.
机译：报告了非离子表面活性剂（如聚氧乙烯（20）脱水山梨糖醇单月桂酸酯（Tween 20）和聚氧乙烯（20）脱水山梨糖醇单硬脂酸酯（Tween 60））在T = 293、303和313 K时的密度，粘度和声速。根据这些测量值，已经计算出不同的参数，例如等熵压缩性，分子自由长度，声阻抗，一次水合数和内压，并将其用于讨论分子堆积，结构改变和分子相互作用。这些参数随温度的变化表明，由于分子的不规则堆积，表面活性剂分子的迁移性增加了液体（表面活性剂+水）的无序状态。同样，对于Tween 20溶液，观察到结构化水分子向本体水的转化更多，对于给定的T，获得较低的可压缩性和较高的水合值以及内部压力。

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