Abstract:
There is provided a method of producing vanadium-based metal-organic frameworks (V-MOFs), the method comprising reducing an oxidation state of vanadium in a leaching solution containing vanadium ions, the leaching solution being derived from a vanadium source, and coordinating one or more linker molecules with vanadium having the reduced oxidation state to form vanadium based metal-organic frameworks. In particular, said vanadium-based metal organic frameworks (V-MOFs) are derived from a vanadium source including an oil refinery waste or a carbon black waste. Also provided are the vanadium based metal-organic frameworks comprising nanostructures having substantially uniform nanorods and/or nanofibers morphology and a method of catalyzing oxidation reactions using the vanadium-based metal-organic frameworks as disclosed herein.
Abstract:
Disclosed herein are methods of synthesizing a hybrid nanomaterial comprising 3D out-of-plane single- to few-layer fuzzy graphene on a scaffold, such as a Si nanowire mesh through a plasma-enhanced chemical vapor deposition process. By varying graphene growth conditions (CH4 partial pressure and process time), the size, density, and electrical properties of the hybrid nanomaterial can be controlled. Porous nanowire-templated 3D graphene hybrid nanomaterials exhibit high electrical conductivity and also demonstrate exceptional electrochemical functionality.
Abstract:
Using processes disclosed herein, materials and structures are created and used. For example, processes can include melting amorphous carbon doped with nitrogen and carbon-13 into an undercooled state followed by quenching. Materials disclosed herein may include dopants in concentrations exceeding thermodynamic solubility limits.
Abstract:
A method is described for for assembling semiconductor nanocrystals comprising: - providing a binary system comprising semiconductor nanocrystals with an effective particle diameter of at most 20 nm, a first solvent, and a second solvent, - the system having * a Ta, which is which is the temperature of the system at which aggregation starts to take place, * a Ts, which is the solvent separation temperature of the system, * an aggregation temperature range, which is the range between Ta and Ts with Ta being included and Ts not being included, * a homogeneous temperature range which is below Ta when Ta is lower than Ts and which is above Ta when Ta is higher than Ts, * a heterogeneous temperature range which is above Ts when Ta is lower than Ts and below Ts when Ta is higher than Ts, and, - bringing the temperature of the binary system from a value in the homogeneous temperature range to a value in the aggregation temperature range, thereby causing formation of an aggregate of said semiconductor nanocrystals.
Abstract:
Sol-gel methods, apparatus and compositions for cladding optical fiber cores provide optical fibers, including single crystal optical fiber cores with polycrystalline cladding, having improved performance in a variety of applications, such as fiber lasers.
Abstract:
Embodiments described herein relate generally to the large scale production of functionalized graphene. In some embodiments, a method for producing functionalized graphene includes combining a crystalline graphite with a first electrolyte solution that includes at least one of a metal hydroxide salt, an oxidizer, and a surfactant. The crystalline graphite is then milled in the presence of the first electrolyte solution for a first time period to produce a thinned intermediate material. The thinned intermediate material is combined with a second electrolyte solution that includes a strong oxidizer and at least one of a metal hydroxide salt, a weak oxidizer, and a surfactant. The thinned intermediate material is then milled in the presence of the second electrolyte solution for a second time period to produce functionalized graphene.
Abstract:
Embodiments described are directed to methods for the functionalization of asphaltene materials and to compositions made from functionalized asphaltenes. Disclosed is a method for synthesizing graphene derivatives, such as 2D single crystalline carbon allotropes of graphene and functional materials, such as sulfonic acid and its derivatives. Also disclosed is a method for the transformation of asphaltene into a source of graphene derivatives and functional materials, such as, 0D, 1D, 2D and combinations of 0D and 1D by utilizing chemical substitution reaction mechanism, such as, electrophilic aromatic substitution, nucleophilic aromatic substitution and Sandmeyer mechanism. Also disclosed are novel graphene materials comprising: acetylenic linkage and hydrogenated graphene. These novel materials, which may be produced by these methods, include, e.g.: 2D single crystalline carbon allotropes of graphene with asymmetric unit formulas C7H6N2O4, C6H4N2O4, C7H7O3S- H3O+, C7H7O3SH+, and a 2D single crystal with asymmetric unit formula (Na6O16S4)n.
Abstract:
An energy-efficient transparent solar film is presented. The solar film has a first film layer with metal nanostructures. The metal nanostructures have plasmon resonances in wavelength bands greater than, or both less than and greater than visible wavelengths, depending on size and shape. The metal nanostructures have no plasmon resonance at visible wavelengths. In another aspect, metal oxide nanocrystals are formed with the first film layer. The metal oxide nanocrystals have absorption in a band of wavelengths less than visible wavelengths, and absorption in a band of wavelengths greater than visible wavelengths. Also provided is a solar film window and fabricating method.