In this study, n-dodecane used as the coupling layer for reusable acoustofluidic microchips was investigated. n-dodecane has the similar viscosity to that of water. However, it possesses much lower surface tension and higher boiling point compared to water. When dispensing a droplet of n-dodecane on lithium niobate (LiNO₃) substrate with interdigital transducers and placing the polydimethylsiloxane microchannel on top of it, n-dodecane can easily wick through and completely occupy the interstitial space. Moreover, it can be readily removed from the substrate without leaving residue. The experimental results showed that the reusable acoustofluidic microchips can be operated at higher input voltages and longer duration when applying n-dodecane as the coupling layer. Attenuation of the acoustic radiant force was observed through decrease of the particle velocity, which is in agreement with the literature results. Decreasing the thickness of the coupling layer can alleviate the attenuation effect and a linear relationship between particle velocity and thickness on a semi-log plot was obtained.

在这项研究中，研究了用作可重复使用的声流体微芯片的耦合层的正十二烷。正十二烷具有与水相似的粘度。然而，与水相比，它具有低得多的表面张力和更高的沸点。当用叉指式换能器在铌酸锂 (LiNO ₃ ) 基板上分配一滴正十二烷并将聚二甲基硅氧烷微通道置于其顶部时，n-十二烷可以很容易地通过并完全占据间隙空间。此外，它可以很容易地从基板上去除而不会留下残留物。实验结果表明，当应用正十二烷作为耦合层时，可重复使用的声流体微芯片可以在更高的输入电压和更长的持续时间下运行。通过降低粒子速度观察到声辐射力的衰减，这与文献结果一致。减小耦合层的厚度可以减轻衰减效应，并且在半对数图上获得了粒子速度和厚度之间的线性关系。