Flexible and Stretchable Elastomer Composites Based on Lightweight Liquid Metal Foam Spheres with Pod-like Contacts,ACS Applied Materials & Interfaces

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Flexible and Stretchable Elastomer Composites Based on Lightweight Liquid Metal Foam Spheres with Pod-like Contacts
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-01-20 , DOI: 10.1021/acsami.2c19621
Xiaokang He ₁ , Tingting Xuan ₁ , Jianpeng Wu ₁ , Haoming Pang ₁ , Huaxia Deng ₁ , Shouhu Xuan ₁ , Xinglong Gong ₁

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Liquid metal (LM) is increasingly employed as a conductive filler in soft and flexible elastomer composites owing to its favorable conductivity and liquid fluidity. However, the high density of LM inevitably increases the weight of composites, which brings limitations in large-area and weight-sensitive applications. This work reports a flexible and stretchable elastomer composite composed of pod-like contacting lightweight LM foam spheres and polydimethylsiloxane matrix (LMS/PDMS). The lightweight LMS reduces the amount of LM used in the preparation process while imparting good electrical conductivity and deformability to the composite. The different contact modes of LMS endow the final composites with diverse strain sensitivity. The mechanism of interfacial contact conduction between the LMS with different melting points has been systematically studied, and the result shows that the liquid–solid contact mode of LMS further improves the strain sensitivity of the composite. Moreover, the composite also has satisfactory electrothermal properties and the temperature can quickly reach 70 °C within 30 s, showing good applicability in electric heating. Finally, the composites containing LMS with different contact modes can be developed as multifunctional sensors to detect human activities, temperature variation, and even underwater vibration, demonstrating the great potential in next-generation sensors and electronics.

中文翻译：

基于具有豆荚状接触的轻质液态金属泡沫球的柔性可拉伸弹性体复合材料

液态金属（LM）由于其良好的导电性和液体流动性，越来越多地用作柔软和柔性弹性体复合材料中的导电填料。然而，LM的高密度不可避免地增加了复合材料的重量，这在大面积和重量敏感的应用中带来了限制。这项工作报告了一种由豆荚状接触轻质 LM 泡沫球体和聚二甲基硅氧烷基质 (LMS/PDMS) 组成的柔性可拉伸弹性体复合材料。轻质 LMS 减少了制备过程中使用的 LM 量，同时赋予复合材料良好的导电性和可变形性。LMS 的不同接触模式赋予最终复合材料不同的应变敏感性。系统地研究了不同熔点的LMS之间的界面接触传导机制，结果表明LMS的液-固接触模式进一步提高了复合材料的应变敏感性。此外，该复合材料还具有良好的电热性能，温度可在30 s内迅速升至70 ℃，在电加热方面具有良好的适用性。最后，包含具有不同接触模式的 LMS 的复合材料可以开发为多功能传感器，以检测人类活动、温度变化甚至水下振动，展示了下一代传感器和电子产品的巨大潜力。该复合材料还具有良好的电热性能，温度可在30 s内迅速升至70℃，在电加热方面具有良好的适用性。最后，包含具有不同接触模式的 LMS 的复合材料可以开发为多功能传感器，以检测人类活动、温度变化甚至水下振动，展示了下一代传感器和电子产品的巨大潜力。该复合材料还具有良好的电热性能，温度可在30 s内迅速升至70℃，在电加热方面具有良好的适用性。最后，包含具有不同接触模式的 LMS 的复合材料可以开发为多功能传感器，以检测人类活动、温度变化甚至水下振动，展示了下一代传感器和电子产品的巨大潜力。

更新日期：2023-01-20

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