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On‐Chip Production of Size‐Controllable Liquid Metal Microdroplets Using Acoustic Waves
Author(s) -
Tang ShiYang,
Ayan Bugra,
Nama Nitesh,
Bian Yusheng,
Lata James P.,
Guo Xiasheng,
Huang Tony Jun
Publication year - 2016
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201600737
Subject(s) - liquid metal , materials science , eutectic system , nanotechnology , gallium , microfluidics , electronics , surface tension , electrode , optoelectronics , alloy , composite material , metallurgy , chemistry , physics , quantum mechanics
Micro‐ to nanosized droplets of liquid metals, such as eutectic gallium indium (EGaIn) and Galinstan, have been used for developing a variety of applications in flexible electronics, sensors, catalysts, and drug delivery systems. Currently used methods for producing micro‐ to nanosized droplets of such liquid metals possess one or several drawbacks, including the lack in ability to control the size of the produced droplets, mass produce droplets, produce smaller droplet sizes, and miniaturize the system. Here, a novel method is introduced using acoustic wave‐induced forces for on‐chip production of EGaIn liquid‐metal microdroplets with controllable size. The size distribution of liquid metal microdroplets is tuned by controlling the interfacial tension of the metal using either electrochemistry or electrocapillarity in the acoustic field. The developed platform is then used for heavy metal ion detection utilizing the produced liquid metal microdroplets as the working electrode. It is also demonstrated that a significant enhancement of the sensing performance is achieved by introducing acoustic streaming during the electrochemical experiments. The demonstrated technique can be used for developing liquid‐metal‐based systems for a wide range of applications.