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US 12,024,433 B2Granted
Methods for making graphene oxide gels
AssigneeSigma-Aldrich Co.
InventorAvery Luedtke
Life of this patent
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Abstract
Methods for reversibly forming graphene oxide gels by reacting graphene oxide dispersed in an aqueous solution with organic amines or quaternary phosphonium salts. Also provided are methods of forming anhydrous graphene oxide dispersions.
Claims16
A method of forming a graphene oxide gel comprising the steps:
- providing an aqueous dispersion of graphene oxide, wherein the aqueous dispersion further comprises an inorganic acid, and the aqueous dispersion is acidic;
- adding a reactant selected from the group consisting of organic amines, quaternary ammonium salts and phosphonium salts,
- wherein the organic amine is selected from the group consisting of alkyl amines, heterocyclic amines, polymeric amines, spiro tetramines and combinations thereof;
- wherein the aqueous dispersion of graphene oxide has a graphene oxide concentration in the range from about 0.1 g/L to about 5 g/L and the reactant has a total organic amine concentration or total phosphonium salt concentration in the range from about 10 mM to about 70 mM, and
- stirring the mixture to form the graphene oxide hydrogel.
2 more elements
A method of forming a graphene oxide gel comprising the steps:
- providing an aqueous dispersion of graphene oxide, wherein the aqueous dispersion is acidic;
- adding a reactant selected from the group consisting of organic amines and phosphonium salts,
- wherein the organic amine is selected from the group consisting of alkyl amines, arylamines, heterocyclic amines, polymeric amines, spiro tetramines and combinations thereof;
- wherein the ratio of the reactant to graphene oxide is from about 0.9 mmol reactant per gram graphene oxide to about 400 mmol reactant per gram graphene oxide;
- wherein the total organic amine concentration or total phosphonium salt concentration is in the range from about 10 mM to about 70 mM;
- and
- stirring the mixture to form the graphene oxide hydrogel.
4 more elements
A method of forming a graphene oxide gel comprising the steps:
- providing an aqueous dispersion of graphene oxide, wherein the aqueous dispersion is acidic;
- adding a reactant selected from the group consisting of organic amines and phosphonium salts,
- wherein the aqueous dispersion of graphene oxide has a graphene oxide concentration in the range from about 0.1 g/L to about 5 g/L and the reactant has a total organic amine concentration or total phosphonium salt concentration is about 40 mM;
- and
- stirring the mixture to form the graphene oxide hydrogel.
2 more elements
Dependencies are inferred from the claim text.