Figure ). This result is at variance with the DFT results reported by Mouhat et al. who did not observe much difference between bulk and confined water. They explained this surprising results in the light of the very dynamic nature of the HBs between the H 2 O molecules and the GO functional groups. On the other hand, Devanathan et al. have reported that, based on force field MD simulations, water diffusion in GO is an order of magnitude slower than in bulk water. The authors attributed this observation to the strong HBs between the H 2 O molecules and the OH groups of GO.