Three-dimensional ultrasonic trapping of micro-particles in water with a simple and compact two-element transducer
Three-dimensional ultrasonic trapping of micro-particles in water with a simple and compact two-element transducer
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DOI：
10.1063/1.4992092
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发表时间：
2017-08-28
影响因子：
4
通讯作者：
Drinkwater, B. W.
中科院分区：
文献类型：
--
作者：
Franklin, A.;Marzo, A.;Drinkwater, B. W.
我们报道了一种简单紧凑的压电换能器，能够稳定地捕获水中的单个和多个微粒。将3D打印的菲涅耳透镜粘结到两元无间隙压电陶瓷圆盘上，以分裂活塞的方式驱动，产生在三维中稳定的声辐射力陷阱。瑞利区(半径为λ/14到lambda/7)的聚苯乙烯微粒被捕获在透镜的焦点处(F#=0.4)，并在峰值捕获刚度为0.43mN/m的声学透明膜上进行二维操纵。瑞利颗粒团也被捕获并在三维中操纵，悬浮在水中。这种换能器与以前用于液体中微粒操纵的声学设备相比有了很大的简化，因为它的工作频率相对较低(688 KHz)，并且只需要一个电气驱动信号。这种简化的设备在生物医学分析中具有广泛应用的潜力，例如细胞或药物胶囊的微型制造和处理。(C)2017年作者(S)。
We report a simple and compact piezoelectric transducer capable of stably trapping single and multiple micro-particles in water. A 3D-printed Fresnel lens is bonded to a two-element kerfless piezoceramic disk and actuated in a split-piston mode to produce an acoustic radiation force trap that is stable in three-dimensions. Polystyrene micro-particles in the Rayleigh regime (radius lambda/14 to lambda/7) are trapped at the focus of the lens (F# = 0.4) and manipulated in two-dimensions on an acoustically transparent membrane with a peak trap stiffness of 0.43 mN/m. Clusters of Rayleigh particles are also trapped and manipulated in three-dimensions, suspended in water against gravity. This transducer represents a significant simplification over previous acoustic devices used for micro-particle manipulation in liquids as it operates at relatively low frequency (688 kHz) and only requires a single electrical drive signal. This simplified device has potential for widespread use in applications such as micro-scale manufacturing and handling of cells or drug capsules in biomedical assays. (C) 2017 Author(s).