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首页> 外文期刊>RSC Advances >Stability of UV/ozone-treated thermoplastics under different storage conditions for microfluidic analytical devices
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Stability of UV/ozone-treated thermoplastics under different storage conditions for microfluidic analytical devices

机译：UV /臭氧处理的热塑性塑料在不同存储条件下对微流体分析装置的稳定性

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Thermoplastics are becoming a popular material for fabricating microfluidic devices and there is an increasing need for robust surface modification strategies. UV/ozone (UVO) treatment is a simple and effective method for making plastic surfaces more hydrophilic. Prior reports on the stability of UVO-treated plastics are limited to four weeks, which is not sufficient for applications requiring long-term storage. Here, we present new findings on the long-term stability of UVO-treated plastics for up to 16 weeks and show that the storage condition has a significant impact on the surface stability. Static contact angle measurements, X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) were performed on UVO-treated cyclic olefin copolymer (COC), polycarbonate (PC) and poly(methyl methacrylate) (PMMA) stored in air, dehumidified and vacuum conditions. We found that the hydrophobic recovery of UVO-treated COC and PC can be inhibited by storing them in dehumidified or vacuum conditions, whereas the stability of PMMA is not significantly influenced by the storage condition. Protein adsorption studies were carried out and showed that there is a significant reduction in the amount of protein adsorption on UVO-treated plastics compared with untreated plastics. Lastly, UVO-treated PMMA microchannels were fabricated and used for capillary-driven flow, which revealed that longer treatment durations generate faster flow rates. These collective results offer new insights into the utility of UVO-treated plastics for microfluidic analytical applications.
机译：热塑性塑料正成为制造微流体装置的流行材料，并且对稳健的表面改性策略的需求也在不断增长。 UV /臭氧（UVO）处理是使塑料表面更亲水的一种简单有效的方法。先前有关UVO处理的塑料稳定性的报道仅限于4周，对于需要长期保存的应用来说还不够。在这里，我们介绍了经过UVO处理的塑料长达16周的长期稳定性的新发现，并显示了储存条件对表面稳定性有重要影响。静态接触角测量，X射线光电子能谱（XPS）和原子力显微镜（AFM）对存储在空气中，经UVO处理的环烯烃共聚物（COC），聚碳酸酯（PC）和聚甲基丙烯酸甲酯（PMMA）进行了测量，除湿和真空条件下。我们发现，将UVO处理的COC和PC储存在除湿或真空条件下可以抑制疏水恢复，而PMMA的稳定性不受储存条件的影响。进行了蛋白质吸附研究，结果表明与未经处理的塑料相比，经UVO处理的塑料的蛋白质吸附量显着降低。最后，制造了经UVO处理的PMMA微通道并将其用于毛细管驱动的流动，这表明较长的处理时间会产生较快的流速。这些共同的结果为UVO处理的塑料在微流体分析应用中的实用性提供了新的见解。

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