• 专利标题:   Preparing polyvinyl alcohol/quaternary ammonium chitosan piezoelectric hydrogel used as piezoelectric piezoresistive sensor in wearable electronic devices, involves adding liquid metal into graphene oxide dispersion liquid, adding hydrochloric acid, and ultrasonicating to obtain black precipitate.
  • 专利号:   CN115121192-A, CN115121192-B
  • 发明人:   WANG W, LI Y, HAN J, WANG C, WEI X, HU Z, DONG Y, LI J
  • 专利权人:   UNIV NORTH CHINA
  • 国际专利分类:   B01J013/00
  • 专利详细信息:   CN115121192-A 30 Sep 2022 B01J-013/00 202201 Chinese
  • 申请详细信息:   CN115121192-A CN10874594 25 Jul 2022
  • 优先权号:   CN10874594

▎ 摘  要

NOVELTY - Preparing polyvinyl alcohol/quaternary ammonium chitosan (PVA/HACC) piezoelectric hydrogel involves adding quaternary ammonium chitosan (HACC) into water until HACC is completely dissolved to obtain a transparent HACC solution, and adding polyvinyl alcohol (PVA) to HACC solution until the PVA is completely dissolved to obtain PVA/HACC solution. Liquid metal (LM) is added into graphene oxide (GO) dispersion liquid, sonicated, added hydrochloric acid dropwise for reduction to obtain black precipitate, centrifugally cleaned and dried to obtain a black solid. The black solid is mixed with the dispersant solution and ulrasonicated to obtain LM/rGO conductive dispersion. The obtained dispersion is added into the PVA/HACC solution to obtain black precursor solution by ultrasonication, placed in a -20°C environment for freezing, and then placed at room temperature . The freezing and room temperature treatments are repeated for at least 3 times to finally obtain PVA/HACC piezoelectric hydrogel. USE - Method for preparing PVA/HACC piezoelectric hydrogel used as piezoelectric piezoresistive sensor in wearable electronic devices (all claimed). ADVANTAGE - The method is simple, cost effective, and the hydrogel prepared by physical crosslinking also has piezoelectric and piezoresistive sensing properties.