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US 10,702,803 B2Granted
Layer-by-layer sorting of rhenium disulfide via high-density isopycnic density gradient ultracentrifugation
AssigneeNorthwestern University
InventorsMark C. Hersam, Joohoon Kang
Life of this patent
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Abstract
Separation of rhenium disulfide nanomaterials and related fluid density gradient media.
Claims28
A method for separating planar nanomaterials by thickness, the method comprising:
- centrifuging a rhenium disulfide nanomaterial composition in contact with an aqueous fluid medium comprising a density gradient and an adjuvant component providing said medium a buoyant density greater than the buoyant density of said rhenium disulfide nanomaterial composition, wherein the rhenium disulfide nanomaterial composition comprises one or more surface active components and a polydisperse population of planar rhenium disulfide nanomaterials which is polydisperse at least with respect to thickness and has a mean thickness on the order of nanometers;
- and
- separating the rhenium disulfide nanomaterial composition into two or more separation fractions each comprising a subpopulation of planar rhenium disulfide nanomaterials from the polydisperse population, wherein the subpopulation of planar rhenium disulfide nanomaterials in at least one of the two or more separation fractions has a mean thickness that is less than the mean thickness of the polydisperse population.
A method for separating rhenium disulfide nanomaterials by thickness, the method comprising:
- sonicating a rhenium disulfide material in a first fluid medium to provide a rhenium disulfide nanomaterial composition;
- centrifuging the rhenium disulfide nanomaterial composition in contact with an aqueous second fluid medium comprising a density gradient and an adjuvant component providing said medium a buoyant density greater than the buoyant density of said rhenium disulfide nanomaterial composition, wherein the rhenium disulfide nanomaterial composition comprises one or more surface active components and a polydisperse population of planar rhenium disulfide nanomaterials comprising monolayer, bilayer, trilayer and n-layer rhenium disulfide nanomaterials, where n is an integer in the range of 4 to 10;
- and
- separating the rhenium disulfide nanomaterial composition into two or more separation fractions each comprising a subpopulation of planar rhenium disulfide nanomaterials from the polydisperse population, wherein the subpopulation in at least one of the two or more separation fractions comprises greater than about 50% of the monolayer rhenium disulfide nanomaterials, bilayer rhenium disulfide nanomaterials, trilayer rhenium disulfide nanomaterials, or combinations thereof.
1 more element
A method for separating monolayer rhenium disulfide nanomaterials, the method comprising:
- centrifuging a rhenium disulfide nanomaterial composition in contact with an aqueous fluid medium comprising iodixanol and CsCl, said medium having a density gradient, wherein the rhenium disulfide nanomaterial composition comprises sodium cholate and a polydisperse population of planar rhenium disulfide nanomaterials comprising monolayer, bilayer and trilayer rhenium disulfide nanomaterials;
- and
- separating the rhenium disulfide nanomaterial composition into two or more separation fractions each comprising a subpopulation of planar rhenium disulfide nanomaterials from the polydisperse population, wherein the subpopulation in one of the two or more separation fractions comprises greater than about 50% of the monolayer rhenium disulfide nanomaterials.
A method of using an increased buoyant density limit for separating planar nanomaterials by thickness, the method comprising:
- providing a composition comprising a nanomaterial and one or more surface active components, said composition comprising a polydisperse population of planar nanomaterials comprising monolayer, bilayer, trilayer and n-layer nanomaterials, where n is an integer selected from 4-about 10, said composition having a buoyant density;
- providing an aqueous fluid medium comprising a density gradient, said medium having a maximum buoyant density;
- introducing a component to said medium, said component having a maximum density limit greater than said composition buoyant density, to provide said medium a buoyant density greater than said composition buoyant density;
- centrifuging said nanomaterial composition in contact with said aqueous fluid medium;
- and
- separating said nanomaterial composition into two or more separation fractions each comprising a subpopulation of planar nanomaterials from the polydisperse population, wherein the subpopulation of planar nanomaterials in at least one of the two or more separation fractions comprises a greater population of the monolayer nanomaterials, bilayer nanomaterials, or a combination thereof as compared to adjacent separation fractions;
- wherein said nanomaterial is rhenium disulfide.
4 more elements
Dependencies are inferred from the claim text.