Oxidation of Gallium-based Liquid Metal Alloys by Water
Oxidation of Gallium-based Liquid Metal Alloys by Water
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DOI：
10.1021/acs.langmuir.0c02086
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发表时间：
2020-11-03
期刊：
影响因子：
3.9
通讯作者：
Tabor, Christopher E.
中科院分区：
文献类型：
--
作者：
Creighton, Megan A.;Yuen, Michelle C.;Tabor, Christopher E.
镓合金与其他低熔点金属，如铟或锡，形成室温液态共晶系统。合金中的镓在暴露于环境氧气时迅速形成薄的表面氧化物。这种表面氧化物先前已被用于液态金属纳米颗粒的自稳定、亚稳态形状的保持以及向合金表面赋予刺激响应行为。在这项工作中，我们研究了水作为氧化剂的效果及其在定义合金表面化学中的作用。我们确定了几种途径，可以导致形成氧化镓氢氧化物（GaOOH）微晶，这可能是不可取的，在许多应用中。此外，我们发现，一些微晶形成途径可以通过典型的自上而下的粒子合成技术，如超声处理。这种对界面相互作用的更好理解为利用这些镓基液态金属合金提供的独特的柔性和导电性耦合的先进器件的工艺设计和实施提供了关键的见解。
Gallium alloys with other low melting point metals, such as indium or tin, to form room-temperature liquid eutectic systems. The gallium in the alloys rapidly forms a thin surface oxide when exposed to ambient oxygen. This surface oxide has been previously exploited for self-stabilization of liquid metal nanoparticles, retention of metastable shapes, and imparting stimuli-responsive behavior to the alloy surface. In this work, we study the effect of water as an oxidant and its role in defining the alloy surface chemistry. We identify several pathways that can lead to the formation of gallium oxide hydroxide (GaOOH) crystallites, which may be undesirable in many applications. Furthermore, we find that some crystallite formation pathways can be reinforced by typical top-down particle synthesis techniques like sonication. This improved understanding of interfacial interactions provides critical insight for process design and implementation of advanced devices that utilize the unique coupling of flexibility and conductivity offered by these gallium-based liquid metal alloys.