Preparation of magnetic field-induced gradient hydrogel and study on its actuation properties
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.
Fe3O4-MXene magnetic nanosheetsN-isopropylacrylamidephotopolymerizationgradient hydrogelsoft robots
万方数据
维普
