writer：Meili Song, Hou-Yong Yu, Jiaying Zhu, Zhaofeng Ouyang, Somia Yassin Hussain Abdalkarim, Kam Chiu Tam
keywords：Multi-branched cellulose nanocrystals， Conductive hydrogel， Self-healing， Sensors
source：期刊
specific source：Chemical Engineering Journal
Issue time：2020年

Self-healing conductive hydrogels as artificial skin-like materials hold

great potential applications in the fields of artificial intelligence, soft

robotics and personal healthcare. However, it remained challenging to construct

stimuli-free self-healing biomimetic hydrogels with ultra-stretchability and

excellent sensitivity. Herein, polyaniline was coated on the surface polycarboxylic

multi-branched cellulose nanocrystals (Multi CNC-PANI) via templated polymerization.

Afterword, rod-like Multi CNC-PANI served as a dynamic bridge endowed those hydrogels

hierarchical structure and dynamic hydrogen bond interactions doped with

polyvinyl alcohol (PVA)/borax system. Combined with the dynamic borate ester

bonds, the biomimetic nanocomposite hydrogels had high breaking strength

(171.52 KPa), ultra-stretchability (1085%), rapid self-healing properties,

adhesiveness, decent biocompatibility, and sensitivity. Especially, the hydrogels

could keep good self-healing ability both in air and underwater without any

stimuli, and the self-healing efficiency could reach up to 99.56% within 120 s.

This hydrogel sensor could sensitively detect and distinguish human motions

including swallow, fingers, wrist, elbow and knee joints, in real-time.

Besides, the self-healed hydrogel gave detective signal with uniform and

repeatable sensitivity, which endowed the hydrogels mechanically adaptability

and good store stability. Therefore, the strategy may provide unique

opportunities in designing biomimetic sensors with skin-like mechanical

stretchability, sensitivity and self-healing properties.