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首页> 外文期刊>The European physical journal, E. Soft matter >Thermo-responsive copolymer coatings for flow regulation on demand in glass microcapillaries
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Thermo-responsive copolymer coatings for flow regulation on demand in glass microcapillaries

机译：用于玻璃微毛细管中按需调节流量的热敏共聚物涂料

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摘要

This study presents thermo-responsive on-demand regulation of water flow rate in glass microcapillaries with a recently developed water-stable, stimuli-responsive poly(methyl methacrylate/N-isopropyl acrylamide) [P(MMA/NIPAM)] copolymer grafted at the inner walls. It is shown that the grafted coatings are stable and can withstand significant tractions under temperature variation. Such microcapillaries allow flow regulation on demand by changing temperature across the lower critical solution temperature (LCST) of the copolymer layer, which makes it swell or shrink, thus changing the bore available for pressure-driven flow. The grafted copolymer layers were subjected to different pressure drops applied to the capillary open ends, as well as to periodic temperature variation across the copolymer LCST to determine the best grafting conditions for microfluidic operation. Then, by varying the temperature, the flow rate in the capillaries was changed periodically on demand due to the swelling/shrinkage of the grafted copolymer layer. It was also shown that the entrapped air bubbles are present in the coating which can result in an apparent slip.
机译：这项研究提出了一种热响应按需调节玻璃微毛细管中水流速的方法，该方法是采用一种新近开发的水稳定性，刺激响应性的聚甲基丙烯酸甲酯/ N-异丙基丙烯酰胺[P（MMA / NIPAM）]共聚物接枝在玻璃微毛细管上。内壁。结果表明，接枝的涂层是稳定的，并且在温度变化的情况下可以承受很大的牵引力。此类微毛细管可通过在共聚物层的较低临界溶液温度（LCST）上改变温度来按需进行流量调节，从而使其膨胀或收缩，从而改变可用于压力驱动流的孔。使接枝的共聚物层经受施加于毛细管开口端的不同压降，以及经受整个共聚物LCST的周期性温度变化，以确定用于微流体操作的最佳接枝条件。然后，通过改变温度，由于接枝共聚物层的膨胀/收缩，毛细管中的流速根据需要周期性地改变。还表明，在涂层中存在夹带的气泡，这可能导致明显的滑移。

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