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Anisotropic Hydrogels with Multiscale Hierarchy Based on Ionic Conductivity for Flexible Sensors
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2023-11-07 , DOI: 10.1021/acsapm.3c01626 Xie Fu 1, 2 , Hui Tong 1, 3 , Xia Zhang 1 , Kun Zhang 1 , Lyes Douadji 1 , Shuai Kang 1 , Jinling Luo 4 , Ziwei Pan 4 , Wenqiang Lu 1
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2023-11-07 , DOI: 10.1021/acsapm.3c01626 Xie Fu 1, 2 , Hui Tong 1, 3 , Xia Zhang 1 , Kun Zhang 1 , Lyes Douadji 1 , Shuai Kang 1 , Jinling Luo 4 , Ziwei Pan 4 , Wenqiang Lu 1
Affiliation
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Nature materials (skin, tissue, plant fiber, and nacre) exhibit super strength and toughness attributed to their unique multiscale hierarchical anisotropic structure. Hydrogels with excellent flexibility, adjustability, and good biocompatibility have become the exciting frontiers in soft electronics, while anisotropic hydrogels that mimic natural materials still face challenges. Herein, we fabricated an anisotropic poly(vinyl alcohol) hydrogel (DS-PVA) with a multiscale hierarchical structure (micro, submicron, and nano) by directional freezing versus salting out, which differs from isotropic hydrogel mechanical performance and force stimuli electrical response behavior. The PVA hydrogel parallel to the freezing direction (DS-PVA∥) showed excellent strength 2.35 MPa (about five times DS-PVA⊥), toughness 1712 KJ/M3 (9.4 times DS-PVA⊥), stability, and antifatigue characteristics, while the DS-PVA⊥ indicated a higher sensitivity (GF = 4.4, ε = 5%) and a faster response/recovery time (127 ms/63 ms). These hydrogels, similar to natural materials with anisotropic mechanical properties, asymmetric sensing properties, and directional recognition, will provide a strategy for flexible sensor applications.
中文翻译：
基于离子电导率的多尺度层次各向异性水凝胶用于柔性传感器
天然材料（皮肤、组织、植物纤维和珍珠质）由于其独特的多尺度分层各向异性结构而表现出超强的强度和韧性。具有优异柔韧性、可调节性和良好生物相容性的水凝胶已成为软电子领域令人兴奋的前沿领域，而模仿天然材料的各向异性水凝胶仍然面临挑战。在此，我们通过定向冷冻与盐析制备了具有多尺度层次结构（微米、亚微米和纳米）的各向异性聚乙烯醇水凝胶（DS-PVA），这与各向同性水凝胶的机械性能和力刺激电响应行为不同。平行于冷冻方向的PVA水凝胶(DS-PVA∥ )表现出优异的强度2.35MPa(约为DS-PVA⊥的5倍)、韧性1712KJ/M 3 (DS- PVA⊥的9.4倍)、稳定性和抗疲劳特性，而 DS-PVA ⊥则显示出更高的灵敏度（GF = 4.4，ε = 5%）和更快的响应/恢复时间（127 ms/63 ms）。这些水凝胶类似于具有各向异性机械特性、不对称传感特性和方向识别的天然材料，将为柔性传感器应用提供策略。
更新日期：2023-11-07
中文翻译：
基于离子电导率的多尺度层次各向异性水凝胶用于柔性传感器
天然材料（皮肤、组织、植物纤维和珍珠质）由于其独特的多尺度分层各向异性结构而表现出超强的强度和韧性。具有优异柔韧性、可调节性和良好生物相容性的水凝胶已成为软电子领域令人兴奋的前沿领域，而模仿天然材料的各向异性水凝胶仍然面临挑战。在此，我们通过定向冷冻与盐析制备了具有多尺度层次结构（微米、亚微米和纳米）的各向异性聚乙烯醇水凝胶（DS-PVA），这与各向同性水凝胶的机械性能和力刺激电响应行为不同。平行于冷冻方向的PVA水凝胶(DS-PVA∥ )表现出优异的强度2.35MPa(约为DS-PVA⊥的5倍)、韧性1712KJ/M 3 (DS- PVA⊥的9.4倍)、稳定性和抗疲劳特性，而 DS-PVA ⊥则显示出更高的灵敏度（GF = 4.4，ε = 5%）和更快的响应/恢复时间（127 ms/63 ms）。这些水凝胶类似于具有各向异性机械特性、不对称传感特性和方向识别的天然材料，将为柔性传感器应用提供策略。
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