A mussel-inspired flexible chitosan-based bio-hydrogel as a tailored medical adhesive

Nature-inspired preparation of self-adhesive, frost-resistant, and ion-conductive hydrogels for flexible strain sensors

“…It is speculated that the addition of QCS-C affects the network structure of PVA and therefore decreases the mechanical strength of the hydrogels, while the coordination interaction between Fe 3+ ions and catechol groups of QCS-C is benecial to partial offset the mechanical strength due to the formation of double-networklike structure inside the hydrogels. 34,44 The conductivity of the PVA/QCS-C/MXene hydrogels with different QCS-C contents was affected by cross-linking treatment with Fe 3+ . The highest conductivity of the hydrogels was approximate 0.4 S m À1 before Fe 3+ cross-linking, which was increased to approximate 3.1 S m À1 aer cross-linking treatment (Fig.…”

“…It is speculated that the addition of QCS-C affects the network structure of PVA and therefore decreases the mechanical strength of the hydrogels, while the coordination interaction between Fe 3+ ions and catechol groups of QCS-C is beneficial to partial offset the mechanical strength due to the formation of double-network-like structure inside the hydrogels. 34,44…”

Advances in Hemostatic Hydrogels That Can Adhere to Wet Surfaces

“…Song et al prepared a multifunctional physical hydrogel adhesive using catechol-modified CS and polyvinyl alcohol as raw materials. Dynamic hydrogen bonding and electrostatic interactions improved the persistence and reproducibility of this hydrogel adhesive [70].…”

“…Konjac glucomannan, dopamine hydrochloride, L-cysteine hydrochloride, and epigallocatechuic acid ester pH-responsive hydrogels [55] Catechol-modified poly(lysine)/poly(acrylamide) hydrogels [56] Anthracene-based polyethyleneimine underwater adhesion hydrogel [63] Hydrogen bonding and catechol chemical adhesion Strong adhesion of hydrogel due to large amount of hydrogen bonding The high water absorption of polyethyleneimine promotes the absorption of interfacial water molecules, allowing the hydrogel to adhere firmly to other substances Van der Waals force Polyethylene glycol hydrogel [65] Water absorption properties, capillary and van der Waals forces Electrostatic interactions 2-Acrylamido-2-methylpropanesulfonic acid, gelatin, CS, ethyl 2-methoxyacrylate, and acrylic acid bonded hydrogels [69] Catechol-modified CS and polyvinyl alcohol were used as raw materials to prepare physical hydrogels [70] Synergistic hydrophobic and electrostatic interactions Dynamic hydrogen bonding and electrostatic interactions…”

Highly Stretchable, Ultra-Sensitive, and Self-Healable Multifunctional Flexible Conductive Hydrogel Sensor for Motion Detection and Information Transmission

“…The antibacterial property makes the sensor not cause discomfort to the skin due to the growth of bacteria when it is in direct contact with the skin. 67 To further demonstrate that the sensor made of the PVA-CS-PA 30% -PANI composite has a wide range of applications, we tested it in more application scenarios. To simulate many touch application scenarios, the composite material was fixed on the keyboard, and the keyboard covered by the composite material was continuously clicked with fingers.…”