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Facile preparation of low swelling,high strength,self-healing and pH-responsive hydrogels based on the triple-network structure

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Frontiers of Materials Science 2019年第1期13卷 54-63页

作者： Zhicun WANG Xiaoman HAN Yixi WANG Kenan MEN Lin CUI Jianning WU Guihua MENG Zhiyong LIU Xuhong GUO School of Chemistry and Chemical Engineering Shihezi University/Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan/Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous Region/Engineering Research Center of Materials-Oriented Chemical Engineering of Xinjiang BingtuanShihezi 832003China Bingtuan Sishi Hospital Yili 835000China School of Medicine Shihezi UniversityShihezi 832003China State Key Laboratory of Chemical Engineering East China University of Science and TechnologyShanghai 200237China

A polyacrylic acid(PAA)/gelatin(Gela)/polyvinyl alcohol(PVA)hydrogel was prepared by copolymerization,cooling,and freezing/thawing *** triplenetwork(TN)structure hydrogel displayed superior mechanical properties,low swelling ratio and self-healing properties,The superior mechanical properties are attributed to the triple helix association of Gela and PVA crystallites by reversible hydrogen *** characterization results indicated that the fracture stress and the strain were 808 kPa and 370% respectively,while the compression strength could reach 4443 kPa and the compressive modulus was up to 39 MPa under the deformation of 90%.The hydrogen bonding in PVA contributed to maintain and improve the self-healing ability of *** type of hydrogels exhibited a higher swelling ratio under alkaline conditions,and the swelling ratios of PAA,PAA/PVA and PAA/Gela hydrogels were 27.71,12.30 and 9.09,*** PAA/Gela/PVA TN hydrogel showed the lowest swelling ratio(6.57)among these *** results indicate that the novel TN hydrogels possess good environmental adaptability and have potential applications in the biomedical engineering and sensor field.

关键词： hydrogel triple-network structure mechanical property swelling selfhealing

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A Self-Strengthening Epidermis-Like Smart Coating Enabled by Dynamic Iron Sequestration

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CCS Chemistry 2021年第11期3卷 2655-2668页

作者： Xiaodong Qi Lei Yang Ying Hou Jiaqi Zhu Ming Yang Shouhua Feng Key Laboratory of Microsystems and Micronanostructures Manufacturing Harbin Institute of TechnologyHarbin 150080 State Key Laboratory of Inorganic Synthesis and Preparative Chemistry Jilin UniversityChangchun 130012

Living organisms rely on materials sequestration from the environment to strengthen their *** constant activity provides necessary supplies for critical biological functions,which is difficult by man-made structures due to the lack of a dynamic sequestration *** this study,it is shown that an epidermis-like smart coating can respond to changes in salinity to allow a spontaneous and progressive strengthening when supported by steel as a sustained iron *** self-strengthening is enabled by reaction-coupled diffusion,which makes possible the dynamic sequestration of iron from the in situ rusted steel,partially mimicking the iron accumulation process in a *** emergence of iron-phenolic coordination bonds continuously improves modulus,hardness,and adhesion,achieving a strengthening efficiency comparable to mussel ***,the bilayer design ensures long-term self-healing performance even during strengthening and a mechanically robust anticorrosion coating with an autonomic protection mechanism and gradually enhanced barrier properties during prolonged *** results provide a new venue for the design of stimuli-responsive smart materials characteristic of an open biological system and may serve as the basis for creating highly intelligent devices with sophisticated functionality.

关键词： biomimetics self-strengthening selfhealing smart coating epidermis-like

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自愈合导电复合水凝胶用于监测人体运动和3D细胞培养

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Science China Materials 2023年第12期66卷 4853-4864页

作者：陈莹况培培王宇舒罗思涵石静怡吕晓薇刘玉鹏范曲立 Key Laboratory for Organic Electronics&Information Displays and Institute of Advanced Materials Nanjing University of Post&TelecommunicationsNanjing 210021China Institute of Chemical Industry of Forest Products CAF Department of ChemistryNanjing 210042China

导电水凝胶已在多个领域崭露头角,因为它具备将外界压力和形变转化为电信号的能力,可实现对物理和化学刺激的灵敏感知.然而,在导电水凝胶的研发中,需要克服平衡导电性和机械强度的挑战.本项工作中,为了提高导电水凝胶的力学性能,我们采... 详细信息

导电水凝胶已在多个领域崭露头角,因为它具备将外界压力和形变转化为电信号的能力,可实现对物理和化学刺激的灵敏感知.然而,在导电水凝胶的研发中,需要克服平衡导电性和机械强度的挑战.本项工作中,为了提高导电水凝胶的力学性能,我们采用了多重策略.首先,引入了木质素-丹宁酸(lignin-TA)颗粒作为物理交联剂,同时充分利用羟丙基纤维素分子的多羟基结构,促进水凝胶半互穿聚合物网络的形成.随后,通过利用Fe^(3+)离子和TA分子之间的静电力和金属配位相互作用,进一步增强了聚合物网络之间的键合强度,提高了水凝胶的导电性.最终,所制备的导电水凝胶以其独特的网络结构,成功融合了物理和化学键的特性,并展现出卓越的自粘附、自愈合能力、电机械性能和生物相容性.这使其成为一个可用于监测人体活动和细胞增殖的理想材料.

关键词： 3D cell culture monitoring conductive hydrogel selfhealing nanocomposite hydrogel

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