基于声表面波介质辅助输运微流体  

Transporting Microfluid by the Help of a Medium Based on the Surface Acoustic Wave

作　　者：章安良 Zhang Anliang(School of Mechanical and Electrical Engineering , Wuyi University , Wuyishan 354300, China)

机构地区：[1]武夷学院机电工程学院

出　　处：《微纳电子技术》2019年第8期649-653,共5页Micronanoelectronic Technology

基　　金：武夷学院高级人才科研基金项目(YJ201809)

摘　　要：提出了介质辅助下压电基片上微流体输运新方法,以避免声表面波(SAW)直接辐射引起的水溶液样品中水蒸发或潜在的生物大分子活性降低问题。小钢珠表面涂覆聚二甲基硅氧烷(PDMS)薄膜,并放置于128°YX-LiNbO3压电基片上,微小水液滴进样于小钢珠与压电基片之间,确保小钢珠在声表面波作用下滑移。同时,对小钢珠上微流体的受力进行了理论分析。以红墨水溶液作为实验对象,进行介质辅助输运微流体实验。结果表明,30.2 dBm电信号功率激发的声表面波可成功地实现直径2 mm小钢珠上1μL红墨水微流体的输运,其输运速度为0.58 mm/s,且小钢珠上红墨水微流体的输运速度随施加的电信号功率增加而增加。A new method for transporting the microfluid on a piezoelectric substrate assisted by a medium was presented, avoiding the evaporation of water in the sample solution or the potential loss of the activity of the biological macromolecules due to the directive radiation of the surface acoustic wave (SAW). A steel ball was coated with the polydimethylsiloxane (PDMS) film, and was placed on a 128° YX - LiNbO3 piezoelectric substrate, where a small water droplet was injected between the steel ball and the piezoelectric substrate for ensuring the sliding motion of the steel ball driven by the SAW. Then the transported microfluid was placed on the steel ball. Meanwhile, the forces on the microfluid were theoretically analyzed. The red ink solution was used for the microfluidic transportation experiment assisted by the medium. The results show that 1μL red ink microfluid on the steel ball with a diameter of 2 mm can be successfully transported by the SAW excited at 30. 2 dBm electric signal power. In addition, the transport velocity of the steel ball with the red ink solution was 0. 58 mm/s and was increased with the increase of the applied electric signal power.

关 键 词：微流体 声表面波(SAW) 压电基片 输运 聚二甲基硅氧烷(PDMS) 

分 类 号：O35[理学—流体力学]