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Toward Imperfection-Insensitive Soft Network Materials for Applications in Stretchable Electronics.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-09-20 , DOI: 10.1021/acsami.9b12690 Jianxing Liu 1 , Honglie Song 1 , Yihui Zhang 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-09-20 , DOI: 10.1021/acsami.9b12690 Jianxing Liu 1 , Honglie Song 1 , Yihui Zhang 1
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Development of stretchable devices with mechanical responses that mimic those of biological tissues/organs is of particular importance for the long-term biointegration, as the discomfort induced by the mechanical mismatch can be minimized. Recent works have established the bioinspired designs of soft network materials that can precisely reproduce the unconventional J-shaped stress-strain curves of human skin at different regions. Existing studies mostly focused on the design, fabrication, and modeling of perfect soft network materials. When utilized as the substrates of biointegrated electronics, the soft network designs, however, often need to incorporate deterministic holes, a type of imperfection, to accommodate hard, inorganic electronic components. Understanding of the effect of hole imperfections on the mechanical properties of soft network materials is thereby essential in practical applications. This paper presents a combined experimental and computational study of the stretchability and elastic modulus of imperfect soft network materials consisting of circular holes with a variety of diameters. Both the size and location of the circular-hole imperfections are shown to have profound influences on the stretchability. Based on these results, design guidelines of imperfection-insensitive network materials are introduced. For the imperfections that result in an evident reduction of stretchability, an effective reinforcement approach is presented by enlarging the width of horseshoe microstructures at strategic locations, which can enhance the stretchability considerably. A stretchable and imperfection-insensitive integrated device with a light-emitting diode embedded in the network material serves a demonstrative application.
中文翻译：
面向在可伸缩电子中应用的对不完全不敏感的软网络材料。
具有可模仿生物组织/器官的机械反应的可拉伸装置的开发对于长期生物整合特别重要，因为可以将由机械失配引起的不适降至最低。最近的工作已经建立了软网络材料的生物启发设计，可以精确地再现人皮肤在不同区域的非常规J形应力-应变曲线。现有研究主要集中在完美的软网络材料的设计，制造和建模上。但是，当用作生物集成电子产品的基板时，软网络设计通常需要合并确定性的孔（一种缺陷），以容纳硬的无机电子元件。因此，在实际应用中，必须了解孔缺陷对软网络材料机械性能的影响。本文提出了由不完整的软网络材料（由各种直径的圆孔组成）的拉伸性和弹性模量的组合实验和计算研究。圆孔缺陷的大小和位置都显示出对拉伸性有深远的影响。基于这些结果，介绍了对缺陷不敏感的网络材料的设计指南。对于导致可拉伸性明显降低的缺陷，提出了一种有效的加固方法，即通过扩大关键位置的马蹄形微结构的宽度来显着提高可拉伸性。
更新日期：2019-09-21
中文翻译：
面向在可伸缩电子中应用的对不完全不敏感的软网络材料。
具有可模仿生物组织/器官的机械反应的可拉伸装置的开发对于长期生物整合特别重要，因为可以将由机械失配引起的不适降至最低。最近的工作已经建立了软网络材料的生物启发设计，可以精确地再现人皮肤在不同区域的非常规J形应力-应变曲线。现有研究主要集中在完美的软网络材料的设计，制造和建模上。但是，当用作生物集成电子产品的基板时，软网络设计通常需要合并确定性的孔（一种缺陷），以容纳硬的无机电子元件。因此，在实际应用中，必须了解孔缺陷对软网络材料机械性能的影响。本文提出了由不完整的软网络材料（由各种直径的圆孔组成）的拉伸性和弹性模量的组合实验和计算研究。圆孔缺陷的大小和位置都显示出对拉伸性有深远的影响。基于这些结果，介绍了对缺陷不敏感的网络材料的设计指南。对于导致可拉伸性明显降低的缺陷，提出了一种有效的加固方法，即通过扩大关键位置的马蹄形微结构的宽度来显着提高可拉伸性。
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