Fig. 15

Preparation of PVA/GO-PEG nano-composite by the freezing-thawing method. Reprinted with permission from ref. [172], Meng, Y., et al., In situ cross-linking of poly (vinyl alcohol)/graphene oxide–polyethylene glycol nanocomposite hydrogels as artificial cartilage replacement: intercalation structure, unconfined compressive behavior, and biotribological behaviors. The Journal of Physical Chemistry C, 2018. 122(5): p. 3157–3167, Copyright (2019)