Methods of making graphene oxide nanofilters
First Claim
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1. A method comprising:
- depositing graphene oxide layers on a first porous surface;
adding a second porous surface atop the graphene oxide;
applying pressure to the first and second porous surfaces up to a yield point of the graphene oxide layers beyond which the layers become incompressible;
correlating the distance between the first and second porous surfaces to an interlayer gap size between the graphene oxide layers; and
determining a filtration cutoff for a filter using the porous surfaces based upon the interlayer gap size.
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Abstract
Nanofiltration of aqueous solutions or other water-based fluids in various applications, such as desalination, dialysis, seawater purification, for example, may be enhanced through precisely controlling a filtration cutoff within graphene oxide nanofilters. By initially compressing and constraining the stacked thickness of multiple graphene oxide layers deposited between porous substrates, the interlayer gap size, and thus, the filtration cutoff may be adjusted and optimized.
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Citations
19 Claims
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1. A method comprising:
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depositing graphene oxide layers on a first porous surface; adding a second porous surface atop the graphene oxide; applying pressure to the first and second porous surfaces up to a yield point of the graphene oxide layers beyond which the layers become incompressible; correlating the distance between the first and second porous surfaces to an interlayer gap size between the graphene oxide layers; and determining a filtration cutoff for a filter using the porous surfaces based upon the interlayer gap size. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method comprising:
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depositing layers of graphene oxide between a first and second support plate to form a filter module; compressing the first and second support plates; determining the thickness of the compressed graphene oxide layers; immersing the filter module in water; determining a separation distance based on at least one of a desired filtration cutoff and a desired interlayer gap size; and separating the first and second support plates by the separation distance. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification