蠕动
材料科学
光热效应
纳米技术
执行机构
爬行
光热治疗
化学
计算机科学
生物化学
医学
解剖
人工智能
作者
Zhifang Sun,Yasuki Yamauchi,Fumito Araoka,Youn Soo Kim,Julián Bergueiro,Yasuhiro Ishida,Yasuo Ebina,Takayoshi Sasaki,Takaaki Hikima,Takuzo Aida
标识
DOI:10.1002/anie.201810052
摘要
Peristaltic crawling, which is the moving mechanism of earthworm-like limbless creatures in narrow spaces, is a challenging target to mimic by using soft materials. Here we report an unprecedented hydrogel actuator that enables not only a peristaltic crawling motion but also reversing its direction. Our cylindrically processed hydrogel contains gold nanoparticles for photothermal conversion, a thermoresponsive polymer network for switching the electrical permittivity of the gel interior, and cofacially oriented 2D electrolytes (titanate nanosheets; TiNSs) to synchronously change their anisotropic electrostatic repulsion. When a hydrogel, which was designed to include cofacially oriented TiNSs along the cylindrical gel axis, is pointwisely photoirradiated with a visible-light laser, it spatiotemporally expands immediately (<0.5 s) and largely (80 % of its original length) in an isovolumetric manner. When the irradiation spot is moved along the cylindrical gel axis, the hydrogel undergoes peristaltic crawling due to quick and sequential elongation/contraction events and moves oppositely toward the laser scanning direction. Thus, when the scanning direction is switched, the crawling direction is reversed. When gold nanorods are used in place of gold nanoparticles, the hydrogel becomes responsive to a near-infrared light, which can deeply penetrate into bio tissues.
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