United States of America As Represented by the Secretary of the Air Force

Other

Kyoungweon Park

Richard A Vaia

Clare M Mahoney

Loon-Seng Tan

Zhenning Yu

The present invention relates to processes for selective reshaping of nanoparticles in three dimensional articles, three dimensional articles produced by such processes, and methods of using such three dimensional articles. As a result of the aforementioned process, such three dimensional articles can have selective tuning that arises, at least in part, from the reshaped nanoparticles found in such articles. Such tuning provides the aforementioned articles with superior performance that can be advantageous in the areas including such as optical filters, multi-functional composites and sensing elements.

Selective reshaping of nanoparticles in three dimensional articles

The invention relates to nanohybrids that are gold nanorod J-aggregates having a broadened surface plasmonic resonance band, processes of making such gold nanorod J-aggregates and products comprising such gold nanorod J-aggregates. Such gold nanorod J-aggregates exhibit broad localized surface plasmonic reasonable range from 800 nm to 2000 nm.

Polyimide-gold-nanorod J-aggregates with broadened surface plasmonic resonance band and method of manufacture

A method for preparing an anhydrous nanoparticle dispersion, comprising providing an aqueous medium comprising a surfactant and a quantity of surfactant-coated nanoparticles suspended in the aqueous medium; (i.) estimating an average particle length and an average particle diameter of the surfactant-coated nanoparticles suspended in the aqueous medium, and estimating a quantity of the surfactant-coated nanoparticles in the aqueous medium; estimating a surface area (SA) of the surfactant-coated nanoparticles in the aqueous medium based on the average particle length and the average particle diameter and the quantity of the surfactant-coated nanoparticles; adjusting a ratio of the quantity of the surfactant-coated nanoparticles to a quantity of the surfactant to a desired value to form a precursor aqueous solution; diluting the precursor aqueous solution with an organic solvent to provide a suspension of surfactant-coated nanoparticles in the solvent, and heating the suspension at about 100&#xb0; C. for about 20 min to remove remaining water.

Polarity inversion of gold nanorod materials

A method for synthesizing nanostructures includes introducing a solution of seed crystals into an initial growth solution to form a nanostructure synthesis mixture. The initial growth solution includes a precursor material and a reducing agent in a surfactant solution. Growth of nanostructures in the nanostructure synthesis mixture is monitored during a period of anisotropic growth of the nanostructures to determine a shift from stage II growth of the nanostructures to stage III growth of the nanostructures. The shift from stage II growth to stage III growth is identified, and after identifying the shift, a second growth solution is added to the nanostructure synthesis mixture coincident in time with the shift. The second growth solution includes the precursor material and the reducing agent in the surfactant solution.

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Beavercreek, OH, United States of America

Kyoungweon Park