Poly(carbonate), PC, surfaces are chemically modified by treatment with sulfur trioxide gas. Sulfur trioxide gas sulfonates the aromatic rings of the poly(carbonate) surfaces, making the surfaces more hydrophilic. Sulfonation of the poly(carbonate) surface is confirmed by infrared spectroscopy. The modified polymer surfaces are found to be smoother in comparison to their unmodified counterparts, as noted by scanning force microscopy. The effects of the surface modification on electroosmotic flow are studied at a pH range of 4-10. The electroosmotic flow in sulfonated poly(carbonate) microchannels was found to be significantly higher than that in unmodified poly(carbonate) microchannels at pH values below 8.

中文翻译：

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微加工聚碳酸酯装置的表面改性和表征：电渗流的操纵。

聚碳酸酯（PC）表面通过用三氧化硫气体进行化学改性。三氧化硫气体使聚碳酸酯表面的芳环磺化，使表面更具亲水性。聚碳酸酯表面的磺化已通过红外光谱法确认。如通过扫描力显微镜观察，发现与未改性的对应物相比，改性的聚合物表面更光滑。在4-10的pH范围内研究了表面改性对电渗流的影响。发现在pH值低于8的条件下，磺化聚碳酸盐微通道的电渗流明显高于未改性聚碳酸盐微通道的电渗流。