Due to their biocompatibility and tissue-like properties, hydrogels have garnered considerable interest in bioelectronics field. Nevertheless, their practical implementation is limited by factors such as inadequate mechanical strength, weak interface adhesion, and the lack of antimicrobial properties. To address these challenges, a novel conductive hydrogel was synthesized through free radical polymerization, incorporating laponite (LA), tannic acid (TA), polyacrylic acid (PAA), and polyacrylamide (pAAm). An innovative approach was employed to enhance LA's dispersion through ionic liquid (IL) in water through electrostatic interactions. The integration of TA, PAA, and PAAm with LA sheets via multiple hydrogen bonds resulted in excellent mechanical properties. The resulting P(AAm-AA)/IL-LA/TA hydrogel exhibits impressive characteristics, including a fracture stress of 0.44 MPa, a strain of 1800%. Notably, the hydrogel's TA component exhibits strong antibacterial activity against Staphylococcus aureus and Escherichia coli . This advanced hydrogel sensor effectively monitors human movements, displaying a gauge factor of 12.7. Furthermore, its versatile and conductive nature facilitates adhesion to a wide range of substrates, making it a promising candidate for applications in human activity monitoring, electronic devices, and medical health surveillance.
Shape memory hydrogels (SMHs) have been the subject of great interest in recent years. However, there were few reports on the simultaneous multiple shape memory and high mechanical performance. Therefore, a novel nanocomposite (NC) hydrogel poly (acrylic acid)/Chitosan/ Laponite (PAA/CS/Laponite) was developed by using Laponite as physical cross-linker. In order to achieve three temporary shapes, the PAA/CS/Laponite was soaked in iron chloride hexahydrate (FeCl 3 ), sodium hydroxide (NaCl) and sodium hydroxide (NaOH) respectively to (a) form metal coordination; (b) gain the chains entanglement of chitosan; (c) get the microcrystalline structure of chitosan. The maximum shape fixity ratio of PAA/CS/Laponite can reach 100% in 1 minute and it can be restored its original shape within 5 minutes. Moreover, PAA/CS/Laponite showed excellent mechanical performance. The maximum tensile and compressive strengths were 0.73 MPa and 13.1 MPa. By comparison with PAA/CS obtained from our previous work, the tensile strength, elongation at break and compressive strength increased by 2.21 times, 1.46 times, and 3.26 times respectively. Scanning electron microscopy (SEM) showed that the obtained sample has uniform honeycomb network structures which can effectively explain why the gel has strong mechanical performance. These characteristics make PAA/CS/Laponite have huge application potential in reality.
危险品化学品经营许可证（带存储）