Polydopamine/polystyrene nanocomposite double-layer strain sensor hydrogel with mechanical, self-healing, adhesive and conductive properties

Inspired by the adhesion mechanism of natural mussels, polydopamine (PDA) has been widely studied and applied in hydrogels due to its good adhesion to various materials. In this work, a double-layer hydrogel constituted of an adhesive layer and a tough layer was successfully prepared via in-situ pol...

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Bibliographic Details
Published in:Materials Science & Engineering C 2020-04, Vol.109, p.110567, Article 110567
Main Authors: Han, Linglin, Liu, Mengfei, Yan, Bin, Li, YueShan, Lan, Ji, Shi, Lingying, Ran, Rong
Format: Article
Language:English
Subjects:
Adhesion
Adhesive bonding
Adhesives
Adhesives - chemistry
Bilayers
Double-layer hydrogel
Electrical conductivity
Electrical resistivity
Human motion
Humans
Hydrogels
Hydrogels - chemistry
Hydrogen bonds
Hydrophobicity
Indoles - chemistry
Light effects
Lithium
Lithium chloride
Materials science
Mechanical properties
Motion perception
Mussels
Nanocomposites
Nanocomposites - chemistry
Nanoparticles
Polymers - chemistry
Polystyrene
Polystyrene resins
Polystyrenes - chemistry
Self-healing
Signal detection
Strain
Substrates
Wearable strain sensor
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Summary:Inspired by the adhesion mechanism of natural mussels, polydopamine (PDA) has been widely studied and applied in hydrogels due to its good adhesion to various materials. In this work, a double-layer hydrogel constituted of an adhesive layer and a tough layer was successfully prepared via in-situ polymerization. Adding polystyrene particles into the tough layer could improve the mechanical properties, and the adhesion of various substrates could be achieved with PDA nanoparticles in the adhesive layer. Furthermore, lithium chloride was introduced into the tough layer to endow the bilayer hydrogels with electrical conductivity. Due to the hydrophobic association in the tough layer and hydrogen bond in the adhesive layer, the double-layer hydrogel exhibits self-healing properties. In addition, the NIR light response property of PDA was beneficial to self-healing properties. As a result, it has proved that the prepared bilayer hydrogel has excellent conductivity, toughness (0.18 MPa), adhesion and self-healing properties, which is an ideal flexible wearable strain sensor with high sensitivity and good repeatability, suitable for human motion signal detection. •A mussel-inspired hydrogel strain sensor.•Excellent self-healing property attributed to the non-covalent interactions and hydrophobical association.•The hydrogel strain sensor showed tough, self-healing, adhesive, reusable and safe properties.
ISSN:0928-4931
1873-0191
DOI:10.1016/j.msec.2019.110567