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A temperature-responsive dual network hydrogel for reversible smart actuator |
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| Authors: | Ting Xie Yi Gao Zequan Li Wei Gao |
| Affiliation: | 1. School of Resources, Environment and Materials, Guangxi University, Nanning, Guangxi, China
Guangxi Engineering and Technology Research Center for High Quality Structural Panels from Biomass Wastes, Guangxi University, Nanning, Guangxi, China State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, Guangxi University, Nanning, China Contribution: Conceptualization (lead), Investigation (lead), Visualization (lead), Writing - review & editing (lead);2. School of Resources, Environment and Materials, Guangxi University, Nanning, Guangxi, China Guangxi Engineering and Technology Research Center for High Quality Structural Panels from Biomass Wastes, Guangxi University, Nanning, Guangxi, China State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, Guangxi University, Nanning, China Contribution: Investigation (equal), Methodology (lead), Writing - original draft (lead);3. School of Resources, Environment and Materials, Guangxi University, Nanning, Guangxi, China |
| Abstract: | Nowadays, soft actuators have received extensive attention in many application fields, among which hydrogels have become an important choice for constructing soft actuators due to their unique properties. However, the actuating behaviors of hydrogel-based actuators are usually monotonous due to their unchangeable shapes and structures. Herein, we report a temperature-responsive hydrogel actuator with a bilayer structure. Based on the dual network structure (polyvinyl alcohol/poly acrylamide and polyvinyl alcohol/poly (N-isopropylacrylamide), the actuators can realize the reinforcement compared with the single network. Because of the intrinsic lower critical solution temperature of poly (N-isopropylacrylamide, both sides of actuators have different swelling rates, enabling them to achieve the thermal-responsive actuation and shape programming. Therefore, this work is promising to provide a new strategy for designing temperature switches and thermally driven soft robots. |
| Keywords: | cross-linking gels swelling |