Lan Wenjie, Li Shaowei, Lu Yangcheng, Xu Jianhong, Luo Guangsheng
The State Key Lab of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China.
Lab Chip. 2009 Nov 21;9(22):3282-8. doi: 10.1039/b913247c. Epub 2009 Sep 17.
This article describes a simple method for the fabrication of microscale polymer tubes. A double co-axial microchannel device was designed and fabricated. Liquid/liquid/liquid multiphase co-laminar flows were realized in a microchannel by choosing working systems. Three kinds of polymeric solutions were selected as the middle phase while a polyethyleneglycol aqueous solution was used as the inner and outer phases in the microfluidic process. The outer and inner phases acted as extractants of the polymer solvent. A stable double core-annular flow was formed by optimizing the composition of the outer and inner phases, and highly uniform tubes were successfully fabricated by the solvent extraction method. Both the outer diameter of the tubes and the wall thickness could be adjusted from 300 microm to 900 microm and from 40 microm to 150 microm by varying the flux of the fluids and the rolling velocity of the collection roller. In addition, titanium dioxide (TiO2) nanoparticles were successfully encapsulated into the polymer tubes with this technique. This technology has the potential to generate hollow fiber membranes for applications in separation and reaction processes.
本文介绍了一种制备微米级聚合物管的简单方法。设计并制造了一种双同轴微通道装置。通过选择工作体系，在微通道中实现了液/液/液多相共层流。在微流控过程中，选择三种聚合物溶液作为中间相，同时使用聚乙二醇水溶液作为内相和外相。外相和内相作为聚合物溶剂的萃取剂。通过优化外相和内相的组成，形成了稳定的双芯环形流，并通过溶剂萃取法成功制备了高度均匀的管子。通过改变流体流量和收集辊的滚动速度，管子的外径和壁厚可分别在300微米至900微米以及40微米至150微米范围内进行调节。此外，利用该技术成功地将二氧化钛（TiO2）纳米颗粒封装到聚合物管中。该技术有潜力生产用于分离和反应过程的中空纤维膜。
