期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 8, 期 35, 页码 12092-12099出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0tc00139b
关键词
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资金
- Zhejiang Outstanding Youth Fund [LR19E020004]
- National Natural Science Foundation of China [11672269, 11972323]
- Zhejiang Provincial Natural Science Foundation of China [LR20A020002]
- Opening Fund of the State Key Laboratory for Strength and Vibration of Mechanical Structures (Xi'an Jiaotong University) [SV2018-KF-23]
- China Scholarship Council [201908330181]
- Fundamental Research Funds for the Provincial Universities of Zhejiang [RF-B2019004]
Smart hydrogels play a vital role in fundamental research and industrial applications in the fields of biosensors, flexible devices and intelligent human-machine technologies; however, developing a simple, low-cost and large-scale method to obtain hydrogel actuators with rapid response and robust and steadily controllable motion remains a big challenge. In this work, a temperature-responsive, gradient structured hydrogel with quick bending and adjustable actuation was fabricated by the copolymerization of the N-isopropylacrylamide (NIPAM) monomer with dispersed montmorillonite (MMT) via a facile precipitation method. The introduction of MMT with good thermal conductivity made the volume phase transition of the PNIPAM-based hydrogel occur earlier, and the deformation degree and bending direction could be adjusted by changing the MMT content. The representative composite hydrogel with 0.2 g MMT in the precursor presented bidirectional bending characteristics with a bending amplitude of about 289 degrees and an average bending speed of about 36.01 s(-1), while the composite hydrogel with 0.3 g MMT in the precursor only possessed a unidirectional bending ability with a bending amplitude of about -259 degrees and a bending velocity of about -28.8 degrees s(-1) due to the great difference in the shrinking capacity between the top and bottom sides of the composite hydrogel. In addition, flexibly controllable deformation was specially realized by a well-designed patterned hydrogel with a local component and a thickness difference. Our work provides a practical method for the ingenious design of a hydrogel for further development of programmable and versatile hydrogel-based smart actuators and soft robots.
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