Synthesis of novel deep eutectic solvent-modified nano cellulosic gel formulation-based strain sensor for human motion monitoring.

Using deep eutectic solvents (DES) to pretreat wheat straw (WS) and extract lignin-containing nanocellulose (LCNC). Acrylic acid/choline chloride (AA/ChCl) polymerizable deep eutectic solvents (PDES) were used as the primary polymerization network, combined with polyvinyl alcohol (PVA). Lignocellulose nanocrystals (LCNC) oxidized by sodium periodate were prepared as dialdehyde-based nanocellulose (DCNC) to serve as the crosslinking agent. Under UV light, a dual-network Polyacrylic acid-Choline chloride/Polyvinyl alcohol/dialdehyde-based nanocellulose ( (PAA-ChCl)/PVA/DCNC) ionic gel was polymerized and prepared, and make it into a sensor. The gel had the advantages of porous structure, good mechanical properties, conductive properties, fast electrical recovery and self-healing. The results revealed the relative resistance of the sensor also changed with the change of the human joint, and also responded multiple times for the continuous same cyclic action of the joint, the sensor could also distinguished different fast and slow movements. This showed the sensor could detect human movement in real time, making it promising for applications in medical devices, electronic skin and other fields, but in real time, the small movement ability of the human body's throat swallowing and bending of the fingers needs to be improved.