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β-Sheet Nanocrystals Dictate Water Responsiveness of Bombyx Mori Silk.
Macromolecular Rapid Communications ( IF 4.6 ) Pub Date : 2020-03-03 , DOI: 10.1002/marc.201900612
Yaewon Park 1 , Yeojin Jung 1, 2 , Tai-De Li 1, 3 , Jianpei Lao 2 , Raymond S Tu 1, 2 , Xi Chen 1, 2, 4
Affiliation  

Water-responsive (WR) materials that strongly swell and shrink in response to changes in relative humidity (RH) have shown a great potential to serve as high-energy actuators for soft robotics and new energy-harvesting systems. However, the design criteria governing the scalable and high-efficiency WR actuation remain unclear, and thus inhibit further development of WR materials for practical applications. Nature has provided excellent examples of WR materials that contain stiff nanocrystalline structures that can be crucial to understand the fundamentals of WR behavior. This work reports that regenerated Bombyx (B.) mori silk can be processed to increase β-sheet crystallinity, which dramatically increases the WR energy density to 1.6 MJ m-3 , surpassing that of all known natural muscles, including mammalian muscles and insect muscles. Interestingly, the maximum water sorption decreases from 80.4% to 19.2% as the silk's β-sheet crystallinity increases from 19.7% to 57.6%, but the silk's WR energy density shows an eightfold increase with higher fractions of β-sheets. The findings of this study suggest that high crystallinity of silk reduces energy dissipation and translates the chemical potential of water-induced pressure to external loads more efficiently during the hydration/dehydration processes. Moreover, the availability of B. mori silk opens up possibilities for simple and scalable modification and production of powerful WR actuators.

中文翻译:

β-Sheet纳米晶体决定Bombyx Mori Silk的水响应性。

响应于相对湿度(RH)的变化而强烈膨胀和收缩的水响应(WR)材料具有巨大的潜力,可以用作软机器人和新的能量收集系统的高能量执行器。但是,控制可扩展和高效WR驱动的设计标准仍然不清楚,因此阻碍了WR材料在实际应用中的进一步发展。大自然为WR材料提供了出色的实例,这些材料包含坚硬的纳米晶体结构,这对于理解WR行为的基础至关重要。这项工作报告说,可以处理再生的家蚕(B.)家蚕丝,以提高β-片层的结晶度,从而将WR能量密度显着提高到1.6 MJ m-3,超过所有已知的天然肌肉,包括哺乳动物的肌肉和昆虫的肌肉。有趣的是,随着蚕丝的β片层结晶度从19.7%增至57.6%,最大吸水率从80.4%降低至19.2%,但蚕丝的WR能量密度随β片层比例的增加而增加了八倍。这项研究的发现表明,丝绸的高结晶度可减少能量耗散,并在水合/脱水过程中将水诱导的压力的化学势更有效地转化为外部载荷。而且,桑蚕丝的可用性为简单,可扩展的修改和生产强大的WR执行器提供了可能性。这项研究的发现表明,丝绸的高结晶度可减少能量耗散,并在水合/脱水过程中将水诱导的压力的化学势更有效地转化为外部载荷。而且,桑蚕丝的可用性为简单,可扩展的修改和生产强大的WR执行器提供了可能性。这项研究的发现表明,丝绸的高结晶度可减少能量耗散,并在水合/脱水过程中将水诱导的压力的化学势更有效地转化为外部载荷。此外,桑蚕丝的可用性为简单,可扩展的修改和生产强大的WR执行器提供了可能性。
更新日期:2020-03-03
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