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首页> 外文期刊>Colloid and polymer science >Thermodynamics of micellization of cationic surfactants in aqueous solutions:consequences of the presence of the 2-acylaminoethyl moiety in the surfactant head group
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Thermodynamics of micellization of cationic surfactants in aqueous solutions:consequences of the presence of the 2-acylaminoethyl moiety in the surfactant head group

机译：阳离子表面活性剂在水溶液中胶束化的热力学：表面活性剂头基中存在2-酰基氨基乙基部分的后果

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The enthalpies of micellization of the following surfactant series have been determined by cal-orimetry;benzyl(2-acylaminoeth-yl)dimethylammonium chlorides,RABzMe_2Cl,and alkyldimethylben-zylammonium chlorides,R'TBzMe_2Cl,where A,Bz and Me refer to amide,benzyl,and methyl groups,respectively and the acyl(for RABzMe_2Cl)and/or the alkyl(for R'BzMe_2Cl)groups C_10,C_12,C_14,and C_16,respectively.For both series,the shapes of the calorimetric titration curves(enthalpograms)depend on the following micellar parameters;critical micelle concentration,aggregation number,and degree of counterion binding.The calorimetric-based critical micelle concentrations are in excellent agreement with those determined by conductivity.The Gibbs free energy,the enthalpy and the entropy of micellization were calculated,and divided into contributions from the CH_2 groups of the hydrophobic tail,arid the terminal CH_3 plus head group of the surfactant.For both surfactant series,all thermodynamic parameters per CH_2 group were found to be similar,since their transfer(from bulk solution to the micelle)is independent of the surfactant head-group structure.The Gibbs free energy,the enthalpy,and the entropy of transfer of the head group of RABzMe_2Cl are more favorable than their counterparts for R'BzMe_2Cl,because of direct and/or water mediated hygrogen bonding of the amide groups in the micelle.
机译：通过比色法确定了以下表面活性剂系列的胶束化焓;苄基（2-酰基氨基乙基-基）二甲基氯化铵，RABzMe_2Cl和烷基二甲基苯-氯化铵，R'TBzMe_2Cl，其中A，Bz和Me表示酰胺，苄基和甲基分别与酰基（对于RABzMe_2Cl）和/或烷基（对于R'BzMe_2Cl）分别为C_10，C_12，C_14和C_16。对于这两个系列，量热滴定曲线的形状（焓图） ）取决于以下胶束参数：临界胶束浓度，聚集数和抗衡离子结合程度。基于量热法的临界胶束浓度与电导率测定的胶束浓度非常吻合。吉布斯自由能，焓和胶束化熵计算，并将其分为疏水性尾部的CH_2基团，端基CH_3和表面活性剂的头基组成。对于两个表面活性剂系列，每C的所有热力学参数H_2基团相似，因为它们的转移（从本体溶液到胶束）与表面活性剂的头基结构无关。RABzMe_2Cl的头基团的吉布斯自由能，焓和转移熵更多。由于其胶束中酰胺基团的直接和/或水介导的水分键合，比R'BzMe_2Cl的同类产品更有利。

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