title: Photoactive Self-Shaping Hydrogels as Noncontact 3D Macro/Microscopic Photoprinting Platforms.
abstract: A photocleavable terpolymer hydrogel cross-linked with o-nitrobenzyl derivative cross-linker is shown to be capable of self-shaping without losing its physical integrity and robustness due to spontaneous asymmetric swelling of network caused by UV-light-induced gradient cleavage of chemical cross-linkages. The continuum model and finite element method are used to elucidate the curling mechanism underlying. Remarkably, based on the self-changing principle, the photosensitive hydrogels can be developed as photoprinting soft and wet platforms onto which specific 3D characters and images are faithfully duplicated in macro/microscale without contact by UV light irradiation under the cover of customized photomasks. Importantly, a quick response (QR) code is accurately printed on the photoactive hydrogel for the first time. Scanning QR code with a smartphone can quickly connect to a web page. This photoactive hydrogel is promising to be a new printing or recording material.
authors.affiliation: School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin, 300072, China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Liao
authors.affiliation: State Key Laboratory for Strength and Vibration of Mechanical Structures and School of Aerospace, Xi'an Jiaotong University, Xi'an, 710049, China.
authors.forename: Ning
authors.initials: N
authors.lastname: An
authors.affiliation: School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin, 300072, China.|National Technology Testing Center for Footwear (Wenzhou), Wenzhou, 325007, China.
authors.forename: Ning
authors.initials: N
authors.lastname: Wang
authors.affiliation: School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin, 300072, China.
authors.forename: Yinyu
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin, 300072, China.
authors.forename: Junfei
authors.initials: J
authors.lastname: Song
authors.affiliation: State Key Laboratory for Strength and Vibration of Mechanical Structures and School of Aerospace, Xi'an Jiaotong University, Xi'an, 710049, China.
authors.forename: Jinxiong
authors.initials: J
authors.lastname: Zhou
authors.affiliation: School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin, 300072, China.
authors.forename: Wenguang
authors.initials: W
authors.lastname: Liu
mesh_terms: D020100:Hydrogels / Q000737:chemistry*; D055668:Photochemical Processes; D014466:Ultraviolet Rays
chemical_list: D020100:Hydrogels
keywords: hydrogel; photoactive; photoprinting; self-shaping