Autonomous Surface Reconciliation of a Liquid-Metal Conductor Micropatterned on a Deformable Hydrogel.,Advanced Materials

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Autonomous Surface Reconciliation of a Liquid-Metal Conductor Micropatterned on a Deformable Hydrogel.
Advanced Materials ( IF 27.4 ) Pub Date : 2020-08-02 , DOI: 10.1002/adma.202002178
Jung-Eun Park ₁ , Han Sol Kang ₁ , Min Koo ₁ , Cheolmin Park ₁

Affiliation

Spreading liquid droplets on solid surfaces is a core topic in physical chemistry with significant technological implications. Liquid metals, which are eutectic alloys of constituent metal atoms with low melting temperatures, are practically useful, but difficult to spread on solid surfaces because of their high surface tension. This makes it difficult to use liquid metals as deformable on‐board microcircuitry electrodes, despite their intrinsic deformability. In this study, it is discovered that eutectic gallium–indium (EGaIn) can be spread onto the surface of chemically cross‐linked hydrogels consisting of aliphatic alkyl chains with numerous hydroxyl groups (OH), thus facilitating the development of directly micropatterned EGaIn electrodes. More importantly, EGaIn patterned on a hydrogel autonomously reconciliates its surface to form a firm hydrogel interface upon mechanical deformation of the hydrogel. This autonomous surface reconciliation of EGaIn on hydrogels allows researchers to reap the benefits of chemically modified hydrogels, such as reversible stretching, self‐healing, and water‐swelling capability, thereby facilitating the fabrication of superstretchable, self‐healable, and water‐swellable liquid‐metal electrodes with very high conductance tolerance upon deformation. Such electrodes are suitable for a variety of deformable microelectronic applications.

中文翻译：

在可变形水凝胶上微图案化的液态金属导体的自主表面调节。

在固体表面上散布液滴是物理化学中的核心主题，具有重要的技术意义。液态金属是具有低熔融温度的组成金属原子的低共熔合金，在实际中是有用的，但是由于它们的高表面张力而难以散布在固体表面上。尽管液态金属具有固有的可变形性，但仍难以将其用作可变形的车载微电路电极。在这项研究中，发现共晶镓铟（EGaIn）可以扩散到化学交联的水凝胶表面，该水凝胶由具有许多羟基的脂肪族烷基链组成（consistingOH），从而促进了直接微图案化的EGaIn电极的开发。更重要的是，在水凝胶上构图的EGaIn可以自动调和其表面，从而在水凝胶发生机械变形时形成牢固的水凝胶界面。EGaIn在水凝胶上的这种自主的表面调节使研究人员可以利用化学修饰的水凝胶的优势，例如可逆拉伸，自修复和水溶胀能力，从而促进了超拉伸，自修复和水溶胀液体的制造‐金属电极在变形时具有很高的电导容限。这样的电极适用于各种可变形的微电子应用。

更新日期：2020-09-15

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