Fabrication and characterization of non-linear parabolic microporous membranes.
Fabrication and characterization of non-linear parabolic microporous membranes.
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DOI：
10.1016/j.memsci.2014.08.042
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发表时间：
2015-01-01
影响因子：
9.5
通讯作者：
Kohli P
中科院分区：
文献类型：
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作者：
Rajasekaran PR;Sharifi P;Wolff J;Kohli P
非线性微孔膜的大规模制造在从分离到微流体的许多应用中具有技术重要性。然而，使用传统技术制造它们的范围有限。本文报道了利用流体的流动特性在聚合物膜中制备非线性抛物型微孔（PMS）并对其进行表征。制造的PMS的形状与描述L-t1/2形式的抛物线关系的简化的Navier-Stokes方程很好地证实。这里，L是在流动时间（t）期间制造的微孔的直径的量度。由于在流体-空气界面处的流体表面张力，PMS的表面是光滑的。我们证明制造PMS使用可固化的聚二甲基硅氧烷（PDMS）。微孔的抛物线形状是由于毛细管力、粘弹性力和重力引起的水平和垂直流体运动之间相互作用的结果。我们还展示了制造不对称的“偏心PMS”和阵列的PMS膜使用这种简单的制造技术。通过控制实验条件，具有纳米尺寸的含有PMS的膜也是可能的。本方法为在微尺度上制备非线性抛物形孔提供了一种简单、易采用、节能的方法。所制备的抛物面膜可以在许多领域中找到应用，包括分离、抛物面光学、微喷嘴/微阀/微泵以及微流体和微电子递送系统。
Large scale fabrication of non-linear microporous membranes is of technological importance in many applications ranging from separation to microfluidics. However, their fabrication using traditional techniques is limited in scope. We report on fabrication and characterization of non-linear parabolic micropores (PMS) in polymer membranes by utilizing flow properties of fluids. The shape of the fabricated PMS corroborated well with simplified Navier-Stokes equation describing parabolic relationship of the form L – t1/2. Here, L is a measure of the diameter of the fabricated micropores during flow time (t). The surface of PMS is smooth due to fluid surface tension at fluid-air interface. We demonstrate fabrication of PMS using curable polydimethylsiloxane (PDMS). The parabolic shape of micropores was a result of interplay between horizontal and vertical fluid movements due to capillary, viscoelastic, and gravitational forces. We also demonstrate fabrication of asymmetric “off-centered PMS” and an array of PMS membranes using this simple fabrication technique. PMS containing membranes with nanoscale dimensions are also possible by controlling the experimental conditions. The present method provides a simple, easy to adopt, and energy efficient way for fabricating non-linear parabolic shape pores at microscale. The prepared parabolic membranes may find applications in many areas including separation, parabolic optics, micro-nozzles / -valves / -pumps, and microfluidic and microelectronic delivery systems.
DOI：
10.1021/la801948z
发表时间：
2008-10-21
期刊：
Langmuir : the ACS journal of surfaces and colloids
影响因子：
--
作者：
Gatebe E;Herron H;Zakeri R;Ramiah Rajasekaran P;Aouadi S;Kohli P
通讯作者：
Kohli P