Materials Science

For stability just add some debris?

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Science  16 Jan 2015:
Vol. 347, Issue 6219, pp. 245
DOI: 10.1126/science.347.6219.245-f

Graphene oxide membranes are made by dissolving graphene sheets—the oxidative exfoliation product of graphite—in water and then filtering the solution to form a stacked film. These membranes can exhibit long-term stability in aqueous environments, though, so why are they stable when their parent sheets are soluble? Yeh et al. attribute this stability to the introduction of multivalent cations during the purification process. For example, if anodized aluminum oxide filter discs are used during processing, the discs can corrode, releasing aluminum ions that crosslink the graphene oxide membranes and make them stable in water. In contrast, membranes prepared using Teflon filter discs readily disintegrated. Multivalent cations, such as Mn2+, also can give them additional stability.

Nat. Chem. 10.1038/nchem.2145 (2015).

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