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Microfluidics of binary liquid mixtures with temperature-dependent miscibility
Molecular Systems Design & Engineering ( IF 3.6 ) Pub Date : 2019/12/02 , DOI: 10.1039/c9me00127a
Maximiliano J. Fornerod 1, 2, 3, 4 , Esther Amstad 5, 6, 7, 8 , Stefan Guldin 1, 2, 3, 4
Affiliation  

Liquid–liquid microfluidic systems rely on the intricate control over the fluid properties of either miscible or immiscible mixtures. Herein, we report on the use of partially miscible binary liquid mixtures that lend their microfluidic properties from a highly temperature-sensitive mixing and phase separation behaviour. For a blend composed of the thermotropic liquid crystal 4-cyano-4′-pentylbiphenyl (5CB) and methanol, mixing at temperatures above the upper critical solution temperature (UCST; 24.4 °C) leads to a uniform single phase while partial mixing can be achieved at temperatures below the UCST. Thermally-driven phase separation inside the microfluidic channels results in the spontaneous formation of very regular phase arrangements, namely in droplets, plug, slug and annular flow. We map different flow regimes and relate findings to the role of interfacial tension and viscosity and their temperature dependence. Importantly, different flow regimes can be achieved at constant channel architecture and flow rate by varying the temperature of the blend. A consistent behaviour is observed for a binary liquid mixture with lower critical solution temperature, namely 2,6-lutidine and water. This temperature-responsive approach to microfluidics is an interesting candidate for multi-stage processes, selective extraction and sensing applications.

中文翻译:

具有与温度相关的混溶性的二元液体混合物的微流体

液-液微流体系统依赖于对可混溶或不可混溶混合物的流体特性的复杂控制。本文中,我们报告了部分混溶的二元液体混合物的使用,这些混合物可从对温度敏感的混合和相分离行为中获得微流体特性。对于由热致液晶4-氰基-4'-戊基联苯(5CB)和甲醇组成的共混物,在高于最高临界溶液温度(UCST; 24.4°C)的温度下混合会导致均匀的单相,而部分混合可以在低于UCST的温度下实现。微流体通道内的热驱动相分离导致非常规则的相排列的自发形成,即液滴,塞子,团状和环形流动。我们绘制了不同的流动形式,并将发现与界面张力和粘度及其温度依赖性的作用联系起来。重要的是,通过改变混合物的温度,可以在恒定的通道结构和流速下获得不同的流态。对于具有较低临界溶液温度的二元液体混合物,即2,6-二甲基吡啶和水,观察到一致的行为。这种对微流体具有温度响应性的方法是多阶段过程,选择性提取和传感应用的有趣候选方法。对于具有较低临界溶液温度的二元液体混合物,即2,6-二甲基吡啶和水,观察到一致的行为。这种对微流体具有温度响应性的方法是多阶段过程,选择性提取和传感应用的有趣候选方法。对于具有较低临界溶液温度的二元液体混合物,即2,6-二甲基吡啶和水,观察到一致的行为。这种对微流体具有温度响应性的方法是多阶段过程,选择性提取和传感应用的有趣候选方法。
更新日期:2020-02-13
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