Wang Shuli, Wang Tieqiang, Ge Peng, Xue Peihong, Ye Shunsheng, Chen Hongxu, Li Zibo, Zhang Junhu, Yang Bai
†State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, P. R. China.
‡Research Center for Molecular Science and Engineering, Northeastern University, Shenyang, 110004, P. R. China.
Langmuir. 2015 Apr 7;31(13):4032-9. doi: 10.1021/acs.langmuir.5b00328. Epub 2015 Mar 24.
We report the flow behavior of water in microfluidic systems based on a chemically patterned anisotropic wetting surface. When water flows inside a microchannel on top of a micropatterned surface with alternating hydrophilic/hydrophobic stripes, it exhibits an anisotropic flowing characteristic owing to the anisotropic wettability; thus, the patterned surface acts as a microvalve for the microfluidic system. The anisotropic flow of water is influenced by the microscale features of the patterns and the dimensions of the microchannels. Furthermore, by reasonably combining the patterned surface and microchannel together, we realize the transportation of water in a microchannel along a "virtual" wall, which is the boundary of the hydrophilic and hydrophobic area. We believe that the chemically patterned surfaces could be an alternative strategy to control the flow behavior of water in microfluidic channels.
我们报道了基于化学图案化各向异性润湿表面的微流体系统中水的流动行为。当水在具有交替亲水/疏水条纹的微图案表面上方的微通道内流动时，由于各向异性润湿性，它呈现出各向异性流动特性；因此，图案化表面充当微流体系统的微阀。水的各向异性流动受图案的微观特征和微通道尺寸的影响。此外，通过合理地将图案化表面和微通道组合在一起，我们实现了微通道内的水沿着“虚拟”壁（即亲水和疏水区域的边界）的传输。我们认为，化学图案化表面可能是控制微流体通道中水的流动行为的一种替代策略。
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