Actuator materials based on graphene oxide/polyacrylamide composite hydrogels prepared by in situ polymerization

Self‐assembled graphene oxide–gelatin nanocomposite hydrogels: Characterization, formation mechanisms, and pH‐sensitive drug release behavior

“…24 For example, the compressive strength of a polyacrylamide hydrogel increased by sixfold with the addition of only 1 wt % GO sheets. 22 The oxygenated functional groups on GO surfaces also enabled it to serve as a physical crosslinker in the formation of a hydrogel. 25 Bai and co-workers reported a pH-sensitive GO-poly(vinyl alcohol) composite hydrogel by a direct mixing method for drug delivery, 26 which showed a storage modulus of 200 Pa and was able to release 84% of the loaded VB12 molecules into a neutral solution after 42 h as opposed to 51% into an acidic solution.…”

“…[19][20][21] A number of GO reinforced polymer hydrogels have recently been reported. [22][23][24] In these hydrogels, monomers were in situ polymerized and chemically crosslinked in the presence of GO sheets and water, where GO acted as a reinforcing filler. The hydrophilic oxygen-containing groups allowed GO to readily exfoliate and stably disperse as monolayer sheets in water, conferring good dispersion of GO in the aqueous solution of hydrophilic polymer matrix, which is critical to mechanically strong hydrogels.…”

Synthesis of Graphene Peroxide and Its Application in Fabricating Super Extensible and Highly Resilient Nanocomposite Hydrogels

“…A few GO/polymer composite hydrogels with chemical bonding between the polymer and GO sheets are also reported. 28,29 Most synthetic hydrogels are mechanically very weak, due to their intrinsic structural inhomogeneity and the lack of an energy-dissipation mechanism. 23,30 Improving the mechanical properties of the hydrogels is a prerequisite to broadening their applications, especially in biomedical fields, such as soft artificial tissues.…”

Self-healable mussel-mimetic nanocomposite hydrogel based on catechol-containing polyaspartamide and graphene oxide

“…Graphene and graphene oxide have also been identified as nanofillers that can mechanically reinforce hydrogels. Graphene oxide (GO), a two-dimensional single-layer nanomaterial, is prepared from graphite by means of chemical oxidation and exfoliation [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. GO can be stably dispersed in aqueous solutions owing to its various oxygen functional groups, including hydroxyl (\ \OH), epoxy (\ \C\ \O\ \C), carbonyl (\ \C_O) and carboxyl (\ \COOH) [35][36][37][38][39][40][41][42].…”