Dilational surface visco-elasticity of CnEOm solutions under dynamic conditions

被引：4
作者：
Fainerman, V. B. [1 ]
Kovalchuk, V. I. [2 ]
Aksenenko, E. V. [3 ]
Nikolenko, M. V. [4 ]
Miller, R. [5 ]
机构：
[1] SINTERFACE Technol, Berlin, Germany
[2] Inst Biocolloid Chem, Kiev, Ukraine
[3] Inst Colloid Chem & Chem Water, Kiev, Ukraine
[4] Ukrainian State Univ Chem Technol, Dnipro, Ukraine
[5] MPI Colloids & Interfaces, Potsdam, Germany
来源：
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2018年 / 557卷
关键词：
Adsorption; Dynamic surface tension; Dilational visco-elasticity; Non-ionic surfactants; ADSORPTION LAYER CHARACTERISTICS; SODIUM DODECYL-SULFATE; AIR-WATER-INTERFACE; AIR/WATER INTERFACE; AIR/LIQUID INTERFACE; ADSORBED LAYERS; KINETICS; C12E5; DROP; TENSIOMETRY;
D O I：
10.1016/j.colsurfa.2018.01.033
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Harmonic surface oscillations of drops are used to study the dilational surface rheology of solutions of the oxyethylated alcohols C10EO8, C12EO5 and C14EO8 at the fixed oscillation frequency of 0.1 Hz for adsorption times between 200 and 5000 s. It was found that at shorter adsorption times the visco-elasticity modulus is lower than its value at longer adsorption times or in the equilibrium state of the adsorption layer at the same surface pressure. This mechanism is explained by the fact that an actual surfactant, characterized by a certain number of EO groups, is in fact a mixture of compounds with a quite wide range of these groups. As molecules with a smaller number of EO groups exhibit a higher visco-elasticity modulus, the changes in the composition of the adsorbed layer during the adsorption lead to the given situation. These considerations are supported by theoretical calculations of the adsorption for mixed surfactants solution.
引用
收藏
页码：131 / 136
页数：6
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