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首页> 外文期刊>Advanced Functional Materials >Recapillarity: Electrochemically Controlled Capillary Withdrawal of a Liquid Metal Alloy from Microchannels
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Recapillarity: Electrochemically Controlled Capillary Withdrawal of a Liquid Metal Alloy from Microchannels

机译：毛细管能力：从微通道中电化学控制的液态金属合金的毛细管抽出

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摘要

This paper describes the mechanistic details of an electrochemical method to control the withdrawal of a liquid metal alloy, eutectic gallium indium (ECaln), from microfluidic channels. ECaln is one of several alloys of gallium that are liquid at room temperature and form a thin (nm scale) surface oxide that stabilizes the shape of the metal in microchannels. Applying a reductive potential to the metal removes the oxide in the presence of electrolyte and induces capillary behavior; we call this behavior "recapillarity" because of the importance of electrochemical reduction to the process. Recapillarity can repeatably toggle on and off capillary behavior by applying voltage, which is useful for controlling the withdrawal of metal from microchannels. This paper explores the mechanism of withdrawal and identifies the applied current as the key factor dictating the withdrawal velocity. Experimental observations suggest that this current may be necessary to reduce the oxide on the leading interface of the metal as well as the oxide sandwiched between the wall of the microchannel and the bulk liquid metal. The ability to control the shape and position of a metal using an applied voltage may prove useful for shape reconfigurable electronics, optics, transient circuits, and microfluidic components.
机译：本文描述了控制微流体通道中液态金属合金（共晶镓铟（ECaln）的撤出）的电化学方法的机理细节。 ECaln是几种镓合金之一，在室温下为液态，可形成薄（纳米级）的表面氧化物，可稳定微通道中金属的形状。对金属施加还原电势会在存在电解质的情况下除去氧化物，并引起毛细管行为。由于电化学还原对工艺的重要性，我们称这种行为为“毛细管现象”。毛细管现象可通过施加电压来反复打开和关闭毛细管行为，这对于控制金属从微通道中抽出很有用。本文探讨了退出机制，并确定了施加电流是决定退出速度的关键因素。实验观察表明，此电流可能对于还原金属前导界面上的氧化物以及夹在微通道壁和块状液态金属之间的氧化物是必要的。使用施加的电压控制金属的形状和位置的能力可能证明对形状可重构的电子器件，光学器件，瞬态电路和微流体组件很有用。

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  • 来源
    《Advanced Functional Materials》 |2015年第5期|671-678|共8页
  • 作者

    Mohammad R. Khan; Chris Trlica; Michael D. Dickey;

  • 作者单位

    Department of Chemical & Biomolecular Engineering North Carolina State University Raleigh, NC 27607, USA;

    Department of Chemical & Biomolecular Engineering North Carolina State University Raleigh, NC 27607, USA;

    Department of Chemical & Biomolecular Engineering North Carolina State University Raleigh, NC 27607, USA;

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