Determination of Time-Evolving interfacial tension and ionic surfactant adsorption kinetics in microfluidic droplet formation process

被引：11
作者：
Liang, Xiao [1 ]
Li, Min [1 ]
Wang, Kai [1 ]
Luo, Guangsheng [1 ]
机构：
[1] Tsinghua Univ, Dept Chem Engn, State Key Lab Chem Engn, Beijing 100084, Peoples R China
来源：
JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2022年 / 617卷
关键词：
Surfactant adsorption; Microfluidics; Dynamic interfacial tension; Droplet formation process; Image recognition; JUNCTION; MODEL; MICROTENSIOMETER; STABILIZATION; GENERATION; EMULSIONS; BUBBLES; PROBE;
D O I：
10.1016/j.jcis.2022.02.139
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：
Surfactant adsorption plays an important role in microfluidics, which can be investigated by the dynamic evolution of interfacial tension. A differential pressure-based method is proposed to understand the basic laws of time-evolving interfacial tension and adsorption kinetics of ionic surfactants during the microfluidic droplet formation processes. Instantaneous flow rates and flow resistances are precisely analyzed based on auto-recognized microscopic images and the waveform of differential pressure, and the interfacial tension is determined from the Young-Laplace equation with a time resolution of 1/60 s. The concentration of surfactant at the liquid-liquid interface is obtained according to the Frumkin adsorption model, leading to an in-depth understanding of the adsorption rates and the apparent mass transfer rates of surfactants. The surfactant adsorption is demonstrated to obey the kinetic-controlled adsorption mechanism and therefore a measurement method for the adsorption rate constant is created to understand the kinetic characteristics of small-molecule ionic surfactants.(c) 2022 Elsevier Inc. All rights reserved.
引用
收藏
页码：106 / 117
页数：12
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