Multifunctional bacterial cellulose-based organohydrogels with long-term environmental stability.
J Colloid Interface Sci
; 608(Pt 1): 820-829, 2022 Feb 15.
Article
em En
| MEDLINE
| ID: mdl-34785459
ABSTRACT
Sensitive strain sensors have attracted more attention due to their applications in health monitoring and human-computer interaction. However, the problems existing in conventional hydrogels, such as inherent brittleness, freezing at low temperature, low toughness, and water evaporation, have greatly hindered the practical applications. In order to solve the above problems, herein, we designed dual network multifunctionality organohydrogels using polyvinylpyrrolidone (PVP) and polyvinyl alcohol (PVA) covalent cross-linking polymer as the first network, the bacterial celluloses (BCs) and calcium chloride by ligand binding as the second network. The prepared organohydrogels showed good conductivity and sensitivity over a wide temperature range (-20 â¼ 40 â), and maintained long-term stability (>15 days) in the air. In addition, the dynamic combination of BCs-Ca2 + and hydrogen bonds in the binary system further endows the organohydrogels with excellent tensile strength (≈1.0 MPa), tensile strain (≈1300%), toughness (≈6.2 MJ m-3), conductivity (3.4 S m-1), gauge factor (≈1.24), adhesion (≈0.3 MPa), and self-healing properties (self-healing tensile strain to 632%). Therefore, this organohydrogel has potential candidates for flexible electronic skin, motion monitoring, and soft robotics.
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Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Celulose
/
Dispositivos Eletrônicos Vestíveis
Limite:
Humans
Idioma:
En
Ano de publicação:
2022
Tipo de documento:
Article