This letter presents a controlled coalescence of nanoliter liquid droplets in air by acoustic directional ejections. An asymmetrical electric field is created within a piezoelectric transducer to produce lopsided acoustic waves, which are focused (through a lens based on the innate impedance mismatch between solid and gas) onto a spot on the liquid surface. The focused acoustic beam is shown to obliquely eject 80-μm-diameter droplets at a traveling speed of 2.3 m/s. Up to four such obliquely ejected droplets coalesce in air into a single droplet, which then continue to travel, rotating at 16 000 rad/s and producing effective micromixing in air.
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机译:这封信提出了通过声学定向喷射可控制的空气中纳升液滴的聚结。在压电换能器中产生一个不对称电场,以产生倾斜的声波,该声波会聚(通过基于固体和气体之间固有的阻抗失配的透镜通过透镜)聚焦到液体表面的斑点上。如图所示,聚焦声束以2.3 m / s的传播速度倾斜地喷出直径为80μm的液滴。多达四个这样的倾斜喷出的液滴在空气中聚集成单个液滴,然后继续行进,以16000 rad / s的速度旋转并在空气中产生有效的微混合。
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