Mechano-Regulable and Healable Silk-Based Materials for Adaptive Applications
Mechano-Regulable and Healable Silk-Based Materials for Adaptive Applications
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用于自适应应用的机械可调节和可修复丝基材料
DOI：
10.1021/acs.biomac.2c00766
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发表时间：
2022
影响因子：
6.2
通讯作者：
Chuhong Zhang
中科院分区：
文献类型：
--
作者：
Jie Cao;Yang Wang;Quanquan Guo;Qinke Cui;Gehong Su;Tao Zhou;Xinxing Zhang;Chuhong Zhang
通过改变机械性能对环境刺激做出响应的机械自适应材料在智能设备中具有高度吸引力。然而，很难以简单的方式调节大多数机械自适应材料的机械性能。此外，实现具有从高强度到极端韧性的机械性能的机械可调节材料仍然是一个挑战。在这里，受到骨骼肌的可逆纳米原纤维网络结构的启发，以实现肌肉力量调节，我们提出了一种机械可调的生物聚合物丝素蛋白（SF）复合材料，通过使用水分子作为竞争性调节剂调节动态金属配位键。单宁酸-二硫化钨纳米杂化材料与SF基体之间存在有效的界面氢键，使复合材料具有较高的机械强度和自修复能力。所得复合材料在水蒸气触发后表现出837倍的杨氏模量变化（5.77 ± 0.61 GPa至6.89 ± 0.64 MPa）、高机械性能（72.5 ± 6.3 MPa）和优异的自愈合效率（接近100%）。展示了概念验证的超适应离子皮肤和智能执行器，从而为未来的自适应智能设备应用提供了方向。
Mechanically adaptive materials responsive to environmental stimuli through changing mechanical properties are highly attractive in intelligent devices. However, it is hard to regulate the mechanical properties of most mechanically adaptive materials in a facile way. Moreover, it remains a challenge to achieve mechano-regulable materials with mechanical properties ranging from high strength to extreme toughness. Here, inspired by the reversible nanofibril network structure of skeletal muscle to achieve muscle strength regulation, we present a mechano-regulable biopolymeric silk fibroin (SF) composite through regulating dynamic metal-ligand coordination bonds by using water molecules as competitive regulators. Efficient interfacial hydrogen bonds between tannic acid-tungsten disulfide nanohybrids and the SF matrix endow the composite with high mechanical strength and self-healing ability. The resulting composite exhibits 837-fold change in Young's modulus (5.77 ± 0.61 GPa to 6.89 ± 0.64 MPa) after water vapor triggering, high mechanical properties (72.5 ± 6.3 MPa), and excellent self-healing efficiency (nearly 100%). The proof-of-concept ultraconformable iontronic skin and smart actuators are demonstrated, thereby providing a direction for future self-adaptive smart device applications.