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Liquid Metal Composites with Anisotropic and Unconventional Piezoconductivity
Matter ( IF 18.9 ) Pub Date : 2020-06-29 , DOI: 10.1016/j.matt.2020.05.022
Guolin Yun , Shi-Yang Tang , Qianbin Zhao , Yuxin Zhang , Hongda Lu , Dan Yuan , Shuaishuai Sun , Lei Deng , Michael D. Dickey , Weihua Li

Anisotropic elastic composites—that is, elastomers containing aligned fillers—often have enhanced properties in the direction of alignment. Depending on the fillers, these composites can have desirable electrical, thermal, or mechanical properties. Here, a silicone composite filled with both solid magnetic metal microparticles and liquid metal microdroplets has been developed. Aligning the solid particles within a magnetic field during curing imparts anisotropy in several properties. Thus, the composite is called an anisotropic liquid metal-filled magnetorheological elastomer (ALMMRE). Compared with isotropic liquid metal-filled composites, the conductivity of the ALMMRE is significantly enhanced in all directions. The ALMMRE also exhibits anisotropic piezoconductivity and a significantly enhanced electrical anisotropy under mechanical deformation; these properties are not observed in conventional anisotropic composites. The ALMMRE also shows anisotropic mechanical, thermal, and magnetic properties and demonstrates its several proof-of-concept applications. The sensitivity of the ALMMRE's properties to strain may help advance future flexible sensors and soft electronics.



中文翻译:

具有各向异性和非常规压电性能的液态金属复合材料

各向异性弹性复合材料(即包含对齐填料的弹性体)通常在对齐方向上具有增强的性能。取决于填料,这些复合材料可具有所需的电,热或机械性能。在此,已经开发了填充有固态磁性金属微粒和液态金属微滴的硅酮复合材料。在固化过程中使固体颗粒在磁场中排列可赋予多种特性各向异性。因此,该复合材料称为各向异性液态金属填充磁流变弹性体(ALMMRE)。与各向同性液态金属填充复合材料相比,ALMMRE的电导率在所有方向上均得到显着提高。在机械变形下,ALMMRE还表现出各向异性的压电性和显着增强的电各向异性。在常规的各向异性复合材料中未观察到这些性能。ALMMRE还显示了各向异性的机械,热和磁性能,并展示了其几种概念验证应用。ALMMRE的特性对应变的敏感性可能有助于推动未来的柔性传感器和软电子设备的发展。

更新日期:2020-06-29
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