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首页> 外文期刊>Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on >Manipulations of silver nanowires in a droplet on a low-frequency ultrasonic stage
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Manipulations of silver nanowires in a droplet on a low-frequency ultrasonic stage

机译：在低频超声台上对液滴中的银纳米线进行操作

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摘要

In this work, we report the use of a low-frequency circular ultrasonic stage to form a circular spot of silver nanowires (AgNWs) at the stage center and to radially align AgNWs on the stage surface. The manipulations are implemented within an AgNW suspension droplet at the center of the ultrasonic stage. The ultrasonic stage (50.8 mm diameter, 3.5 mm thick) operates at a flexural vibration mode symmetric about its center and has a vibration peak at the center. The AgNW suspension is formed of deionized water with AgNWs dispersed in it. The operating frequency of the ultrasonic stage is 21.3 kHz; the AgNWs have diameter of 100 nm and length of approximately 30 ;C;m. When the ultrasonic stage vibrates properly, AgNWs on the substrate surface in the droplet may move to the stage center and form a spot or rotate to the radial direction and align radially. The spot diameter and thickness are several hundred micrometers and several micrometers, respectively. The rotation speed of a single AgNW can be up to 31u000b0;/min when the vibration velocity of the stage center is 42 mm/s (0-p) for a 40-;C;L droplet. After the droplet dries out by natural evaporation without ultrasound, the spot and radial alignment have little change in the size and pattern. Principle analyses show that the spot formation and radial alignment of AgNWs are caused by the acoustic streaming in the radial direction in the droplet.
机译：在这项工作中，我们报告了使用低频圆形超声镜台在镜台中心形成银纳米线（AgNWs）的圆形斑点，并使AgNWs在镜台表面上径向对齐的情况。该操作是在超声台中央的AgNW悬浮液滴内进行的。超声台（直径50.8毫米，厚3.5毫米）以弯曲振动模式运行，该弯曲振动模式围绕其中心对称，并且在中心处具有振动峰值。 AgNW悬浮液由去离子水形成，其中分散有AgNW。超声台的工作频率为21.3 kHz； AgNW的直径为100 nm，长度约为30; C; m。当超声镜台适当振动时，液滴中基板表面上的AgNW可能会移动到镜台中心并形成斑点，或者沿径向旋转并径向对齐。光斑直径和厚度分别为几百微米和几微米。当载物台中心的振动速度对于40°C; L液滴为42 mm / s（0-p）时，单个AgNW的转速可以高达31u000b0; / min。液滴在没有超声波的情况下通过自然蒸发变干后，斑点和径向排列的大小和图案几乎没有变化。原理分析表明，AgNWs的斑点形成和径向排列是由液滴中沿径向的声流引起的。

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