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Photographs of graphene oxide (GO) aerogel and graphene nano-platelet (GNP): (a) 2:1 ratio GO/GNP aerogel, (b) 1:1 ratio GO/GNP aerogel, (c) 1:2 ratio GO/GNP aerogel, (d) 2:1 ratio rGO/GNP aerogel, (e) 1:1 ratio rGO/GNP aerogel and (f) 1:2 ratio rGO/GNP aerogel. (g) Zeta potential values of GO and GNP in the range of 2–10 pH.
