在非振动基板上控制纳米颗粒的超声浓度

2015 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA) Pub Date : 2015-12-28 DOI:10.1109/SPAWDA.2015.7364439

Xiao-fei Wang, Jun-hui Hu

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引用次数: 0

摘要

我们展示了一种将纳米级样品浓缩在固定基底(不振动)上的水悬浮液薄膜中的方法，该方法利用平行于固定基底并在其上方的超声振动针产生的声流。基片表面的声流涡流将纳米粒子带到涡流的中心。直径为250 nm的SiO2纳米颗粒可以在固定的衬底上形成一个直径为400 μm的圆形光斑。用有限元法对上述现象的原理进行了分析和验证。

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Controlled ultrasonic concentration of nano particles on a nonvibrating substrate

We show a method of concentrating nanoscale samples in a film of aqueous suspension on a stationary substrate (not in vibration), which employs the acoustic streaming generated by an ultrasonically vibrating needle parallel to and above the stationary substrate. The acoustic streaming eddy on the substrate surface brings nano particles (NPs) to the center of the eddy. Concentrated SiO2 nano particles with a diameter of 250 nm may form one circular spot on the stationary substrate, with a diameter up to 400 μm. The principles of the above phenomena are analyzed and verified by the finite element method.

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2015 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)

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