Acoustic-counterflow microfluidics by surface acoustic waves
Acoustic-counterflow microfluidics by surface acoustic waves
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DOI：
10.1063/1.2889951
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发表时间：
2008-03-10
影响因子：
4
通讯作者：
Beltram, Fabio
中科院分区：
文献类型：
--
作者：
Cecchini, Marco;Girardo, Salvatore;Beltram, Fabio
在这封信中，我们展示了疏水性聚二甲基硅氧烷(PDMS)-铌酸锂(LiNbO_3)微通道中一种意想不到的表面声波(SAW)驱动的泵浦效应。流体通道内的雾化和声表面波辅助聚结导致液体相对于声表面波传播方向的逆流。将这种物理机制与声流过程驱动压电基板上的孤立液滴位移进行了对比。这一原理被证明不容易适用于当前的微通道情况。所提出的器件结构可用于将微泵集成到复杂的微流控芯片中，从而提高微全分析系统的便携性。(C)2008年美国物理研究所。
In this letter, we demonstrate an unexpected surface-acoustic-wave (SAW)-driven pumping effect in hydrophobic polydimethilsiloxane (PDMS)-lithium niobate (LiNbO3) microchannels. Atomization within the fluidic channel followed by SAW-assisted coalescence leads to liquid counterflow with respect to the SAW propagation direction. This physical mechanism is contrasted with the acoustic-streaming process driving isolated drop displacement on piezoelectric substrates. This principle is shown not to be readily applicable to the present microchannel case. The proposed device geometry can be exploited to integrate micropumps into complex microfluidic chips, improving the portability of micro-total-analysis systems. (C) 2008 American Institute of Physics.