Hydrogels hold great promise in the field of flexible electronics. Attempts in this area tend to the microstructure design of hydrogels, giving them specific adhesion and multi‐sensing functions. Here, a novel phase separation‐derived anisotropic adhesive structural color hydrogel film is presented for visually flexible electronics. The hydrogel film is generated by template replicating colloidal crystal by using phase separation emulsions of hydrophilic monomer (acrylic acid, AA), hydrophobic monomer (lauryl methacrylate, LMA), co‐monomer ([2‐(methacryloyloxy) ethyl] dimethyl‐(3‐sulfopropyl) ammonium hydroxide (SBMA)), surfactants (hexadecyl trimethyl ammonium bromide, CTAB) and initiator (ammonium persulphate (APS)). The appearance of phase separation results in asymmetric morphologies of hydrogel film, imparting them with anisotropic adhesive performance. Attributed to the formation of inverse opal scaffold structure, the hydrogel film is featured with vivid structural color, showing superior capability in self‐reporting mechanical behavior. Additionally, benefitting from the presence of abundant ions, the hydrogel film exhibits great conductivity. Thus, the resultant hydrogel film is demonstrated with stable dual‐signal sensing properties involving color‐changing and conductivity feedback ability to respond to human activities. These features make the proposed anisotropic adhesive structural color hydrogel film highly potential in the flexible electronic field.

中文翻译：

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用于柔性电子产品的相分离衍生各向异性粘合剂结构彩色水凝胶薄膜


水凝胶在柔性电子领域具有广阔的前景。该领域的尝试倾向于水凝胶的微观结构设计，赋予它们特定的粘附力和多传感功能。在这里，提出了一种新型相分离衍生的各向异性粘合结构彩色水凝胶薄膜，用于视觉上灵活的电子产品。水凝胶膜是通过使用亲水单体（丙烯酸，AA）、疏水单体（甲基丙烯酸月桂酯，LMA）、共聚单体（[2-（甲基丙烯酰氧基）乙基]二甲基-（3）的相分离乳液，通过模板复制胶体晶体生成的。 ‐磺丙基）氢氧化铵（SBMA））、表面活性剂（十六烷基三甲基溴化铵，CTAB）和引发剂（过硫酸铵（APS））。相分离的出现导致水凝胶膜的形态不对称，赋予其各向异性的粘合性能。由于形成反蛋白石支架结构，水凝胶薄膜具有鲜艳的结构色彩，表现出优异的自报告机械行为能力。此外，得益于丰富离子的存在，水凝胶薄膜表现出良好的导电性。因此，所得水凝胶薄膜具有稳定的双信号传感特性，包括颜色变化和电导率反馈能力，以响应人类活动。这些特性使得所提出的各向异性粘合结构彩色水凝胶薄膜在柔性电子领域具有巨大潜力。