Department of Materials Science and Engineering, Clemson University, 161 Sirrine Hall, Clemson, South Carolina 29634, USA.
ACS Appl Mater Interfaces. 2012 Sep 26;4(9):4541-8. doi: 10.1021/am3008664. Epub 2012 Aug 20.
Microfluidic fiber channels with switchable water transport are fabricated in flexible textile PET/PP materials using a preprogrammed yarn-based fabric and a yarn-selective surface modification method. The developed robust and scalable fabrication method is based on the selective functionalization of the PET yarns with an epoxide-containing polymer that is then followed by grafting patterns of different pH-sensitive polymers PAA [poly(acrylic acid) ] and P2VP [poly(2-vinyl pyridine)]. The selective functionalization of the fabric yields an array of amphiphilic channels that are constrained by hydrophobic PP boundaries. Aqueous solutions are transported in the amphiphilic channels by capillary forces where the direction of the liquid transport is defined by pH-response of the grafted polymers. The channels are fed with liquid through hydrophilic, pH insensitive PEG [polyethylene glycol] ports. The combination of the PAA and P2VP patterns in the amphiphilic channels is used to create pH-sensitive elements that redirect aqueous liquids toward PAA channels at pH > 4 and toward both PAA and P2VP channels at pH < 4. The system of pH-selective channels in the developed textile based microfluidic chip could find analytical applications and can be used for smart cloth.
使用预编程纱线基织物和纱线选择性表面改性方法，在柔性纺织 PET/PP 材料中制造具有可切换水传输的微流控纤维通道。所开发的强大且可扩展的制造方法基于对含有环氧化物的聚合物对 PET 纱线进行选择性功能化，然后接枝不同 pH 敏感聚合物 PAA[聚丙烯酸]和 P2VP[聚(2-乙烯基吡啶)]的图案。织物的选择性功能化产生了一系列由疏水性 PP 边界约束的两亲性通道。水溶液通过毛细作用力在两亲性通道中输送，其中液体输送的方向由接枝聚合物的 pH 响应定义。通道通过亲水性、pH 不敏感的 PEG[聚乙二醇]端口进料液体。在两亲性通道中 PAA 和 P2VP 图案的组合用于创建 pH 敏感元件，这些元件将水溶液在 pH > 4 时重新引导到 PAA 通道，在 pH < 4 时引导到 PAA 和 P2VP 通道。在开发的基于纺织品的微流控芯片中，pH 选择性通道系统可以找到分析应用，并可用于智能衣物。
