Preparation And Application Of Carrageenan Hydrogel Soft Sensor

Hydrogel is a three-dimensional polymer network that dissolves a large amount of water,with tissue similarity and compatibility.As a kind of flexible material with excellent conductivity,hydrogel has great potentials in soft sensor field.Therefore,the development of durable,adhesive,repairable,highly sensitive hydrogel sensors will play a key role in flexible electronics area.This dissertation discusses two double-network hydrogel molecular structure design and preparation methods based on κ-carrageenan and polyacrylamide,which have improved strain sensitivity of hydrogel and broken through the bottleneck of application such as durability.Firstly,polyacrylamide/κ-carrageenan /locust bean gum(CI)hydrogel was prepared,in which non-covalent bonds(ionic bond and hydrogen bond)are introduced as "sacrifice bond" to strengthen its mechanical property.Additionally,CI hydrogel has excellent conductivity and strain sensitivity to sense slight finger bend and convert the signal into servo deflection feedback and subsequent control over the robotic arm.On the basis of strain sensitivity of polyacrylamide/κ-carrageenan hydrogel,an efficient electrochemistry functionalization preparation strategy is proposed to integrate improved mechanical property,interfacial adhesion,repairability into the whole hydrogel system,This method could also prepare microscopic ordered wrinkling and macroscopic controllable patterning endowing hydrogel with a modular sensibility similar to the real human skin sensing mechanism,which is different areas of the electrochemistry functionalized hydrogel exhibit distinct resistance signal change for the same strain stimulation,and the same patterning area exhibits time-dependent disparity response.This modular sensing mechanism provesκ-carrageenan hydrogel’s potential in soft sensor application.