Dynamic interfacial tension measurements with microfluidic Y-junctions.
Dynamic interfacial tension measurements with microfluidic Y-junctions.
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DOI：
10.1021/la901103r
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发表时间：
2009-07
期刊：
影响因子：
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通讯作者：
Maartje L. J. Steegmans;A. Warmerdam;K. Schroën;R. Boom
中科院分区：
文献类型：
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作者：
Maartje L. J. Steegmans;A. Warmerdam;K. Schroën;R. Boom
微型装置中的乳化（微流体乳化）涉及微米尺寸的液滴和快速的界面膨胀速率。此外，液滴在不到几毫秒的时间内形成，因此传统的张力测定技术不能用于量化实际的界面张力。在本文中，使用在平面微流体 Y 形连接处形成的单分散液滴来量化（微流体）乳化过程中的表观动态界面张力。在具有一系列静态界面张力的乙醇水溶液中形成十六烷液滴，以得出校准曲线，随后使用该曲线来获取在表面活性剂溶液中形成的十六烷液滴的动态界面张力。对于 SDS 和 Synperonic PEF108，研究了各种连续相和分散相（十六烷）流速，这些条件与界面张力效应相关，这也允许研究表面活性剂的对流传输。基于这些发现，可以遵循并讨论形成乳液滴的各种策略。
Emulsification in microdevices (microfluidic emulsification) involves micrometer-sized droplets and fast interface expansion rates. In addition, droplets are formed in less than milliseconds, and therefore traditional tensiometric techniques cannot be used to quantify the actual interfacial tension. In this paper, monodisperse droplets formed at flat microfluidic Y-junctions were used to quantify the apparent dynamic interfacial tension during (microfluidic) emulsification. Hexadecane droplets were formed in ethanol-water solutions with a range of static interfacial tensions to derive a calibration curve, which was subsequently used to access the dynamic interfacial tension of hexadecane droplets formed in surfactant solutions. For SDS and Synperonic PEF108, various continuous- and disperse-phase (hexadecane) flow rates were studied, and these conditions were linked to interfacial tension effects, which also allowed convective transport of surfactants to be investiagted. On the basis of these findings, various strategies for the formation of emulsion droplets can be followed and are discussed.