GRAPHENE OXIDE MEMBRANES AND RELATED METHODS
First Claim
1. A membrane, comprising:
- crosslinked graphene oxide sheets, wherein a thickness of the membrane is greater than or equal to about 0.2 microns and a weight percentage of graphene oxide in the membrane is greater than or equal to about 70 wt. %.
1 Assignment
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Accused Products
Abstract
Membranes comprising graphene oxide sheets and associated filter media and methods are provided. In some embodiments, a membrane may comprise graphene oxide sheets that have undergone one or more chemical treatments. The chemical treatment(s) may impart beneficial properties to the membrane, such as a relatively small d-spacing, compatibility with a broad range of environments, physical stability, and charge neutrality. For example, the graphene oxide sheets may undergo one or more chemical treatments that form chemical linkages between at least a portion of the graphene oxide sheets in the membrane. Such chemical linkages may impart a small d-spacing, broad compatibility, and/or allow relatively thick membranes to be formed. In certain embodiments, the graphene oxide sheets may undergo one or more chemical treatment that imparts relative charge neutrality to the membrane by altering the ionizability of certain functional groups. Graphene oxide membranes, described herein, can be used for a wide range applications.
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Citations
57 Claims
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1. A membrane, comprising:
crosslinked graphene oxide sheets, wherein a thickness of the membrane is greater than or equal to about 0.2 microns and a weight percentage of graphene oxide in the membrane is greater than or equal to about 70 wt. %. - View Dependent Claims (3, 9, 11, 13, 14, 15, 18, 19, 21, 22, 23, 34)
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2. (canceled)
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4-5. -5. (canceled)
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6. A membrane, comprising:
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a first graphene oxide sheet; a second graphene oxide sheet; and a chemical linkage that attaches the first graphene oxide sheet to the second graphene oxide sheet, wherein the chemical linkage is of Formula I;
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7-8. -8. (canceled)
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10. (canceled)
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12. (canceled)
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16-17. -17. (canceled)
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20. (canceled)
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24-33. -33. (canceled)
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35-53. -53. (canceled)
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54. A method, comprising:
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contacting a membrane comprising crosslinked graphene oxide sheets with a mixture comprising a fluid, a first species having a molecular weight of greater than or equal to about 250 g/mol, and a second species having a molecular weight of less than about 250 g/mol; and passing the fluid and the second species through the membrane, wherein at least a portion of the first species is rejected by the membrane. - View Dependent Claims (55, 56)
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57-58. -58. (canceled)
Specification