气凝胶
自愈水凝胶
材料科学
聚乙烯醇
复合材料
多孔性
极限抗拉强度
多孔介质
纤维素
细菌纤维素
化学工程
高分子化学
工程类
作者
Yu Xie,Zhaohui Li,Yawen Zhang,Yunjie Lu,Jianming Zhang,Lu Zong
出处
期刊:Small
[Wiley]
日期:2023-07-04
标识
DOI:10.1002/smll.202303044
摘要
Abstract Lightweight porous hydrogels provide a worldwide scope for functional soft mateirals. However, most porous hydrogels have weak mechanical strength, high density (>1 g cm −3 ), and high heat absorption due to weak interfacial interactions and high solvent fill rates, which severely limit their application in wearable soft‐electronic devices. Herein, an effective hybrid hydrogel‐aerogel strategy to assemble ultralight, heat‐insulated, and tough polyvinyl alcohol (PVA)/SiO 2 @cellulose nanoclaws (CNCWs) hydrogels (PSCG) via strong interfacial interactions with hydrogen bonding and hydrophobic interaction is demonstrated. The resultant PSCG has an interesting hierarchical porous structure from bubble template (≈100 µm), PVA hydrogels networks introduced by ice crystals (≈10 µm), and hybrid SiO 2 aerogels (<50 nm), respectively. PSCG shows unprecedented low density (0.27 g cm −3 ), high tensile strength (1.6 MPa) & compressive strength (1.5 MPa), excellent heat‐insulated ability, and strain‐sensitive conductivity. This lightweight porous and tough hydrogel with an ingenious design provides a new way for wearable soft‐electronic devices.
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