UV-driven microvalve based on a micro-nano TiO2/SiO2 composite surface for microscale flow control
UV-driven microvalve based on a micro-nano TiO2/SiO2 composite surface for microscale flow control
复制标题
基于微纳米TiO2/SiO2复合表面的紫外线驱动微型阀，用于微尺度流量控制
DOI：
10.1088/0957-4484/25/12/125301
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发表时间：
2014-03-28
期刊：
影响因子：
3.5
通讯作者：
Li, Xueru
中科院分区：
文献类型：
--
作者：
Guo, Ting;Meng, Tao;Li, Xueru
本文提出了一种新型的紫外驱动微阀的概念的基础上插入一个三甲基氯硅烷（CTMS）改性的TiO 2/SiO 2复合贴片的可切换的润湿性的微流控系统。设计了一种独特的微纳分级结构，并用于提高整体润湿对比度，以改善基于润湿的阀性能。采用场发射扫描电子显微镜（FE-SEM）和X射线光电子能谱（XPS）对表面形貌和化学成分进行了表征。UV驱动的润湿性转换的修补微通道上进行了研究，使用水柱相对高度测试，结果证实了显着改善的层次结构与表面疏水/亲水转换，产生增强的276%和95%的防水和吸水压力，分别与那些的单尺度的二氧化钛纳米图案化结构。因此，良好的可逆和反复开关性能被确定的阀门测试，突出了潜在的应用，在微尺度流动的有效控制的新型微阀。
This paper presents a novel ultraviolet (UV)-driven microvalve based on the concept of inserting a trimethyl chlorosilane ( CTMS) modified TiO2/SiO2 composite patch of switchable wettability in a microfluidic system. A unique micro-nano hierarchical structure was designed and used to enhance the overall wetting contrast with the aim of improving the wetting-based valve performances. Field-emission scanning electron microscopy (FE-SEM) and x-ray photoelectron spectroscopy (XPS) were used to characterize the morphology and chemical composition of the surface. UV-driven wettability conversion on the patched microchannel was investigated using water column relative height tests, and the results confirmed the significant improvement of the hierarchical structure with the surface hydrophobic/hydrophilic conversion, which produced enhancements of 276% and 95% of the water-repellent and water-sucking pressures, respectively, compared with those of the single-scale TiO2 nanopatterned structure. Accordingly, a good reversible and repeated on-off performance was identified by the valve tests, highlighting the potential application of the novel microvalve in the efficient control of microscale flow.