论文期刊

Relative position control and coalescence of independent microparticles using ultrasonic waves




作者: Shuang Deng,Kun Jia*,Jian Chen,Deqing Mei,Keji Yang
发表/完成日期: 2017-05-14
期刊名称: Journal Of Applied Physics
期卷:
相关文章:
论文简介
Controlling the relative positions and coalescence of independent cells or microparticles is of
particular importance for studying many physical phenomena, biological research, pharmaceutical
tests, and chemical material processing. In this work, contactless maneuvering of two independent
microparticles initially lying on a rigid surface was performed at a stable levitation height within a
water-filled ultrasonic chamber. Three lead zirconate titanate transducers with 2MHz thickness resonance
frequency were obliquely mounted in a homemade device to form a sound field in a half
space. By modulating the excitation voltage of a single transducer and the subsequent combination
of amplitude and phase modulation, two separate 80 lm diameter silica beads were picked up from
the chamber bottom, approached, and then coalesced to form a cluster in different ways. Both particles
simultaneously migrated towards each other in the former process, while more dexterous
movement with single-particle migration was realized for the other process. There is good agreement
between the measured trajectories and theoretical predictions based on the theory of the firstorder
acoustic radiation force. The method introduced here also has the ability to form a cluster at
any desired location in the chamber, which is promising for macromolecule processing ranging
from the life sciences to biochemistry and clinical practice.
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