Hydrogel networks as underwater contact adhesives for different surfaces

Abstract

<p>We have developed strong and durable hydrogel adhesives for underwater bonding.</p>

Applications of Hydrogel with Special Physical Properties in Bone and Cartilage Regeneration

“…Once firmly bonded, the tight coupling between the nanocrystals in the hydrogel composite and the matrix is an important source of tight bonding between the adhesive and the matrix and high bonding strength [ 93 ]. Cui et al [ 94 ] combines macroscopic surface modification with hydrogels with dynamic bonds to regulate the arrangement of supramolecular functional groups in the dynamic hydrogels on the surface of the hydrogels, so that the hydrogels have an effect on biological tissues. The quantified adhesion ability can be applied to wound dressings and adhesives for tissue healing ( Figure 9 ).…”

Synthesis and optimization of dopamine hydrochloride functionalized palygorskite and their application in protective coatings on water saturated surface of concrete

“…The PDA film containing catechol groups attached on the surface of Pal by heterogeneous nucleation, its own highly active hydroxyl groups have been shown to be able to penetrate water boundary layers and play a critical role in adhesion via undergo a diverse array of chemical interactions with the concrete substrates including interacts with the local metal ions Ca 2+ , Mg 2+ , Al 3+ to form adhesive bonds, covalent cross-links, and so on. 9,11 Moreover, they could make it a secondary reaction platform to continue the Michael addition reaction or Schiff base reaction with the epoxy resin and curing agent in a water saturated environment, which made the interface between EP 18 and the water saturated concrete surface form stable covalent bonds through the medium of Pal@-PDA. On the other hand, by combining the surface force test with molecular dynamics simulation, Waite et al [30][31][32][33] studied the action process of protein containing PDA on the surface of organic monolayer.…”

“…This strong adhesion is due to a large number of holdfast proteins secreted by byssal plaque of mussels and the main components of them are modified amino acid 3, 4‐dihydroxyphenylalanine (DOPA), which play a critical role in wet adhesion. They are recognized to be able to penetrate the water boundary layer and undergo a series of different chemical interactions with the solid surface, including covalent bonds, hydrogen bonds and electrostatic interactions 9,11 . Since then, researchers designed and synthesized a series of bionic wet adhesives inspired by catechol groups from the perspective of biomimetic molecular theory 12–14 .…”

“…They are recognized to be able to penetrate the water boundary layer and undergo a series of different chemical interactions with the solid surface, including covalent bonds, hydrogen bonds and electrostatic interactions. 9,11 Since then, researchers designed and synthesized a series of bionic wet adhesives inspired by catechol groups from the perspective of biomimetic molecular theory. [12][13][14] However, the preparation of these adhesives all required complicated chemical synthesis process and harsh reaction conditions and the purity of the synthesized product was low, which undoubtedly limited their application in practice.…”

Applications of Bioinspired Reversible Dry and Wet Adhesives: A Review

“…Mechanical fixations, whereby friction or an interlocking force are primarily applied, cause surface damage (Fuentes et al, 2015;O'Brien et al, 2019;Ozaki et al, 2020). Chemical adhesives have limitations such as low repeatability, surface contamination by residue, and vulnerability to moisture (Yuk et al, 2016;Pan et al, 2020). As a novel solution to these problems, bioinspired synthetic dry and wet adhesives have been applied to adhesion systems in advanced industries.…”