Two-dimensional superparamagnetic Fe3O4-MXene nanosheets are synthesized via acid etching and high temperature thermal decomposition methods,and used together with N-isopropylacrylamide as raw materials to develop an anisotropic gradient hydrogel actuator.Results show that Fe3O4-MXene nanosheets move vertically down in the hydrogel precursor solution to generate incremental content gradient,which leads to an anisotropic gradient network structure after cross-linking and fixation.The hydrogels form different sizes of pores along the thickness direction.The pores on the side away from the magnet have a relatively larger size of approximately 50 μm,and the size of the pores near the magnet gradually decrease to about 5 μm.Fe3O4-MXene nanosheets endow the hydrogel with excellent photothermal effect,which can achieve a variety of reversible deformations and bionic soft robot functions under near-infrared light irradiation.
关键词
Fe3O4-Mxene磁性纳米片/N-异丙基丙烯酰胺/光聚合/梯度水凝胶/软机器人
Key words
Fe3O4-MXene magnetic nanosheets/N-isopropylacrylamide/photopolymerization/gradient hydrogel/soft robots
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