title: Fast self-healing of graphene oxide-hectorite clay-poly(N,N-dimethylacrylamide) hybrid hydrogels realized by near-infrared irradiation.
abstract: Self-healing hydrogels were proposed to be used as biomaterials, because of the capability of spontaneously healing injury, but most of the reported self-healing hydrogels do not possess high mechanical strength and fast self-healing at the same time. Herein, we prepared graphene oxide (GO)-hectorite clay-poly(N,N-dimethylacrylamide) (PDMAA) hybrid hydrogels with enhanced mechanical properties and fast self-healing capability realized by near-infrared (NIR) irradiation. The physical cross-linking between clay sheets and PDMAA chains provided the hydrogel with mechanical strength to maintain its stability in shape and architecture. GO sheets in the hybrid hydrogels acted as not only a collaborative cross-linking agent but also as a NIR absorber to absorb the NIR irradiation energy and transform it to thermal energy rapidly and efficiently, resulting in a rapid temperature increase of the GO containing gels. The chain mutual diffusion and the reformation of physical cross-linking occurred more quickly at higher temperature; consequently, the damaged hydrogel was almost completely recovered in a few minutes upon irradiation. We also demonstrated a potential application of the hybrid hydrogel as a self-healing surgical dressing.
authors.affiliation: Research Institute of Materials Science and State Key Laboratory of Luminescent Materials and Devices, South China University of Technology , Guangzhou 510640, China.
authors.forename: Enzhong
authors.initials: E
authors.lastname: Zhang
authors.forename: Tao
authors.initials: T
authors.lastname: Wang
authors.forename: Lei
authors.initials: L
authors.lastname: Zhao
authors.forename: Weixiang
authors.initials: W
authors.lastname: Sun
authors.forename: Xinxing
authors.initials: X
authors.lastname: Liu
authors.forename: Zhen
authors.initials: Z
authors.lastname: Tong
mesh_terms: D000178:Acrylamides / Q000737:chemistry* / Q000528:radiation effects; D000538:Aluminum Silicates / Q000737:chemistry / Q000528:radiation effects; D001458:Bandages; D000077215:Clay; D006108:Graphite / Q000737:chemistry* / Q000528:radiation effects; D006244:Hardness / Q000528:radiation effects; D020100:Hydrogels / Q000737:chemistry* / Q000528:radiation effects; D007259:Infrared Rays; D008422:Materials Testing; D053758:Nanoparticles / Q000737:chemistry* / Q000528:radiation effects / Q000648:ultrastructure*; D010087:Oxides / Q000737:chemistry / Q000528:radiation effects; D010316:Particle Size; D017640:Silicates / Q000737:chemistry / Q000528:radiation effects; D013718:Tensile Strength / Q000528:radiation effects
chemical_list: D000178:Acrylamides; D000538:Aluminum Silicates; D020100:Hydrogels; D010087:Oxides; D017640:Silicates; C429790:poly(N,N-dimethylacrylamide); C013547:hectorite; D006108:Graphite; D000077215:Clay
keywords: PDMAA; graphene oxide; hybrid hydrogel; near-infrared; self-healing