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首页> 美国卫生研究院文献>Polymers >Tuning the Surface Wettability of Cyclic Olefin Copolymer by Plasma Treatment and Graphene Oxide Deposition and Reduction
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Tuning the Surface Wettability of Cyclic Olefin Copolymer by Plasma Treatment and Graphene Oxide Deposition and Reduction

机译：通过等离子体处理和石墨烯涂层调节环烯烃共聚物的表面润湿性和减少

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Selective altering of surface wettability in microfluidic channels provides a suitable platform for a large range of processes, such as the phase separation of multiphase systems, synthesis of reaction controlled, nanoliter sized droplet reactors, and catalyst impregnation. Herein we study the feasibility to tune the wettability of a flexible cyclic olefin copolymer (COC). Two methods were considered for enhancing the surface hydrophilicity. The first is argon/oxygen plasma treatment, where the effect of treatment duration on water contact angle and COC surface morphology and chemistry were investigated, and the second is coating COC with GO dispersions of different concentrations. For enhancing the hydrophobicity of GO-coated COC surfaces, three reduction methods were considered: chemical reduction by Hydroiodic acid (HI), thermal reduction, and photo reduction by exposure of GO-coated COC to UV light. The results show that as the GO concentration and plasma treatment duration increased, a significant decrease in contact angle was observed, which confirmed the ability to enhance the wettability of the COC surface. The increase in hydrophilicity during plasma treatment was associated with the increase in surface roughness on the treated surfaces, while the increase during GO coating was associated with introducing oxygen-containing groups on the GO-coated COC surfaces. The results also show that the different reduction methods considered can increase the contact angle and improve the hydrophobicity of a GO-coated COC surface. It was found that the significant improvement in hydrophobicity was related to the reduction of oxygen-containing groups on the GO-coated COC modified surface.
机译：在微流体通道的表面润湿性的选择性改变提供了一个合适的平台对于大范围的过程，如多相体系的相分离，反应的合成控制，纳升尺寸的液滴的反应器和催化剂浸渍。在这里我们研究的可行性，以调整灵活的环烯烃共聚物（COC）的润湿性。两种方法被认为是提高表面亲水性。第一种是氩/氧等离子处理，其中治疗持续时间上的水接触角和COC表面形态和化学的影响进行了研究，并且第二个是用不同浓度的GO分散体的涂料COC。为了提高GO-涂覆COC表面的疏水性，被认为是三个减速方法：化学还原由氢碘酸（HI），热还原和光还原由GO-涂覆COC的暴露于UV光。结果表明，作为GO浓度和等离子体处理持续时间增加，在接触角的下降显著观察到，这证实增强COC表面的润湿性的能力。等离子体处理过程中的亲水性的增加与被处理表面上的表面粗糙度的增加相关联，而GO涂覆过程中增加与所述GO-涂覆COC表面上引入含氧基团相关联。该结果还表明，所考虑的不同的还原方法可以增加接触角和改善GO-涂覆COC表面的疏水性。结果发现，在疏水性显著改善是有关含氧基团的GO-COC涂覆改性表面的还原。

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