writer：Qinlin Wang#, Lin Zhu#, ... Gang Qin*, Gengzhi Sun, Qiang Chen*, et al
keywords：Near-Infrared Responsive Shape Memory Hydrogels
source：期刊
specific source：SCIENCE CHINA Technological Sciences
Issue time：2021年

Near-Infrared Responsive Shape Memory Hydrogels with Programmable and Complex Shape-Morphing

Qinlin Wang#, Lin Zhu#, Dandan Wei, Huan Sun, Chen Tang, Ke Li, Jia Yang, Gang Qin*, Gengzhi Sun, Qiang Chen*

SCIENCE CHINA Technological Sciences, https://doi.org/10.1007/s11431-020-1735-9

In this work, semi-crystalline nanocomposite hydrogels (i.e. PAAmA11A/GO gels) were synthesized by micellar copolymerization of acrylamide and N-acryloyl-11-aminoundecanoic acid (A11A) in the presence of a large amount of sodium dodecyl sulfonate (SDS) micelles and GO nanosheets. The resulted hydrogels not only demonstrated high strength and high toughness, but also exhibited good shape memory property. Because of near-infrared (NIR) light absorbability of GO nanosheets, shape recovery and shape of PAAmA11A/GO gels could be tuned by NIR irradiation. Moreover, bilayer hydrogels and trilayer hydrogels were also fabricated by the integration of shape-memorized PAAmA11A/GO gel and elastic hydrophobic associated hydrogel (E-gel). Based on NIR-responsive shape memory property and layered structure, shape deformation of bilayer hydrogels and trilayer hydrogels was rather different from single PAAmA11A/GO gel. Each kind of gel structure exhibited diverse and complex shapes via programmable NIR irradiation. More importantly, the shape morphing of NIR-SMHs-based hydrogels could mimic the hand, flower and be used as actuators.