Valve based on novel hydrogels: from synthesis to application

摘要: Abstract New hydrogels as materials with potential application in the area of actuators have been developed. Hydrogel synthesis was performed using tris[(hydroxymethyl) methyl]acrylamide (NAT) and itaconic acid (ITA) monomers (+)N,N′-diallyltartradiamide (DAT) crosslinker. The NAT–ITA were prepared different molar fraction characterized by FTIR-ATR, rheology, swelling properties mechanical force. hydrogel 80% 20% NAT ITA, respectively, has lowest equilibrium ratio (ESR = 16) water but highest elastic modulus (10 ± 1 kPa) strength (2.2 ± 0.1 N h −1 ). gel increased 0.5 N a half hour, while volume 4 times when passed from an medium to basic medium. This chosen prepare pH-sensitive valve control flux capillary tube. tested system formation Fe 3+ –EDTA complex. response time 3 15 min open close valve, respectively. flow solution through 11 μL min . pressure during closing 10 kPa. continuous opening involves repetitive expansion collapse network that could damage structure network. However, produced reproducible stable response. dynamic hydrogen bonding existing polymeric chains products assist reversible process subjected work. gels self-healing capacity networks indicated be applicable development systems for controlled drug release.