Liquid Metal Composites with Anisotropic and Unconventional Piezoconductivity
Liquid Metal Composites with Anisotropic and Unconventional Piezoconductivity
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DOI：
10.2139/ssrn.3554082
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发表时间：
2020-03
期刊：
影响因子：
18.9
通讯作者：
Guolin Yun;Shiyang Tang;Qianbin Zhao;Yuxin Zhang;Hongda Lu;Dan Yuan;Shuaishuai Sun;L. Deng;M. Dickey;Weihua Li
中科院分区：
文献类型：
--
作者：
Guolin Yun;Shiyang Tang;Qianbin Zhao;Yuxin Zhang;Hongda Lu;Dan Yuan;Shuaishuai Sun;L. Deng;M. Dickey;Weihua Li
概述各向异性弹性复合材料--即含有取向填充物的弹性体--通常在取向方向上具有增强的性能。根据填充物的不同，这些复合材料可以具有理想的电、热或机械性能。在这里，我们研制了一种固体磁性金属微粒和液态金属微滴填充的有机硅复合材料。在固化过程中使固体颗粒在磁场中对齐可在几个性质上产生各向异性。因此，这种复合材料被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的导电性在各个方向都有显著提高。ALMMRE还表现出各向异性的压电性和在机械变形下显著增强的电各向异性；这些特性在传统的各向异性复合材料中是没有观察到的。ALMMRE还显示了各向异性的机械、热和磁性，并展示了它的几个概念验证应用。ALMMRE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技术的发展。
Summary 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.