中文摘要：

利用选择性紫外曝光法对聚二甲基硅氧烷（PDMS）微流控芯片通道内壁进行了部分亲/疏水改性,通过接触角和原子力显微镜对改性表面进行表征,并利用改性后的芯片制备出了高度均一的单乳液和复乳液.结果表明,在芯片的非曝光区域,光引发剂二苯甲酮使PDMS表面粗糙且保持疏水性,接触角为101°;而在曝光区域,由于聚合形成的聚丙烯酸交联到PDMS上使其表面光滑且具有亲水性,接触角为62°,形成的亲/疏水特性可维持30d以上.利用改性后芯片制备的大豆油、三羟甲基丙烷丙烯酸酯和氟碳油3种单乳液的粒径变异系数均低于3%,而复乳液外径和内径的变异系数分别为3.5%和2.9%.

英文摘要：

A novel region-selective hydrophilic modification approach by UV irradiation was used to change the surface property in PDMS-based microfluidic chip. The surface properties of microchannels before and after modification were characterized by contact angle measurement and atomic force microscope. Thereafter, microfluidic chip region-selectively modified by this method was applied to prepare highly uniform single and double emulsions. The results demonstrated that in the un-exposed region, original hydrophobic PDMS surface tended to be very coarse and hydrophobic with contact angle 101° after photoinitiator solution treatment. But in the UV-exposed region, poly（acrylic acid） was coated on the surface, leading to a hydrophilic surface with contact angle 62°. In addition, those hydrophilic and hydrophobic features were able to maintain at least for 30 d. Using the modified microfluidic chips, three kinds of highly uniform O/W single droplets, soybean oil, trimethylolpropane triacrylate and fluorocarbon oil, were prepared with coefficient variation （CV） below 3%. Uniform W/O/W double emulsions were also successfully prepared with CV of the outer and inner diameters at 3.5% and 2.9%, respectively.