为了获得具有良好微流动特性的圆截面微流体器件,并构建二维裸微结构微流体管道网络,设计了玻璃三通微流体管道热流变拉制仪。在三通微管道拉伸成形过程中,变形区热软化后的V形玻璃毛细管,可在冷却过程中一次性拉制成三通微管道,储液池在拉制过程的同时成型,并与三通管光滑连接。拉制仪可实现等内径和不等内径拉伸。通过对加热时间、拉伸行程和玻璃材料分配系数的调节,可以控制三通微管道各项参数。制备出了内径为67、32和20μm的圆截面三通微管道。它的三根微管道在三通结点处光滑连通;由于表面张力成型,微管道具有较高的表面质量。最后,以三通微管道和一维玻璃微管道为基础单元,组建了微流体管道网络。

In order to fabricate vitreous microfluidic components with round cross sections and microchannel networks with nude structure,a hot rheologic deformation puller for fabricating vitreous three-way microchannel was designed.In the forming process of the three-way microchannel,the tip of the bended glass capillary with the shape of "V" was softened by heating and then was pulled into three-way microchannel in cooling process.The reservoirs connecting the microchannels with conical pipes were also formed during the pulling process.The three-way microchannels with both equal or unequal inner diameters could be made by the puller.The temperature in the heating field,the inner diameter of microchannel and the distribution coefficient of vitreous material could be adjusted by heating time,pulling distance and micro-feed mechanism,respectively.A three-way microchannel with inner diameter of 67,32 and 20 μm was fabricated,its three ways were connected smoothly in the joint.For surface tension forming,the three-way microchannel shows a higher quality surface.Finally,a microchannel network was assembled with the one-dimension microchannels and the three-way microchannels successfully.