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

Other

Richard A Vaia

Loon-Seng Tan

Kyoungweon Park

David Huabin Wang

Shane Juhl

Sergei F Lyuksyutov

Clare M Mahoney

Ali M Jawaid

Ramamurthi Kannan

Jeffrey H Sanders

Joseph Charles McAuliffe

Rajesh R Naik

Bruce A Reinhardt

Zhenning Yu

Hilmar Koerner

Andrey A Voevodin

Philip R Buskohl

Mark J Pender

Robert I MacCuspie

Steve J Diamanti

Ruel McKenzie

Pavlo B Paramonov

Hao Fong

Lawrence F Drummy

Asra Hassan

Steven T Patton

A method of making a layered MXene material comprises a) introducing dried MAX phase powder into a vessel under anhydrous, inert conditions, the MAX phase powder comprising a general formula of M+1AX(n=1, 2, 3, or 4), wherein M is a transition metal or p-block metalloid selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Re, Cu, Ni, Ag, Zn, Cd, In, Sn, and Pb; interlayer A is a Group III, IV, or V metalloid selected from the group consisting of Al, Si, Ga, Ge, In, Sn, Pb, As, Bi, Sb, and X is one of C (carbon) and N (nitrogen); b) introducing a halogen and solvent to the dried MAX phase to create a halogen solution having a predetermined concentration; c) allowing a reaction to proceed for about 24 hours between 30-90° C. to create a reaction slurry comprising a MXene material.

Preparation of layered MXene via elemental halogen etching of MAX phase

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 technique for exfoliating a transition metal dichalcogenide material to produce separated nano-scale platelets includes combining the transition metal dichalcogenide material with a liquid to form a slurry, wherein the transition metal dichalcogenide material includes layers of nano-scale platelets and has a general chemical formula MX, and wherein M is a transition metal and X is sulfur, selenium, or tellurium. The slurry of the transition metal dichalcogenide material is treated with an oxidant to form peroxo-metalate intermediates on an edge region of the layers of nano-scale platelets of the transition metal dichalcogenide material. The peroxo-metalate intermediates is treated with a reducing agent to form negatively charged poly-oxo-metalates to induce separation of the transition metal dichalcogenide material into the separated nano-scale platelets of the transition metal dichalcogenide material.

Exfoliating layered transition metal dichalcogenides

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.

Concentrated synthesis of monodispersed gold nanorods

New diamine monomers bearing sulfone terminated pendant groups, as well as methods for making the same, are provided. The diamine monomers are useful toward making polyamide, polyimide, and poly(amide-imide) polymers and copolymers, which possess hygromorphic properties and demonstrate humidity driven motility.

Hygromorphic polymers and copolymers having humidity-driven motility

A crosslinked aromatic polyimide having shape memory properties and methods of making the same. The crosslinked aromatic polyimide comprises at least one aromatic diamine, at least one dianhydride monomer, and a tri(oxybenzene-amine) crosslinker. The crosslinked aromatic polyimide polymers and films possess superior shape memory properties at temperatures above 225&#xb0; C.

Crosslinked aromatic polyimides and methods of making the same

Nanocomposites of repeat sequence protein polymers and phyllosilicates demonstrated improved material properties, for example, improved elasticity, and are useful as suture, tissue scaffolding, and biodegradable composite materials.

Nanocomposites of repeat sequence proteins and phyllosilicate clays and their preparation

A life and electrical properties enhanced microelectromechanical systems (MEMS) switch apparatus in which a combined nanoparticle and ionic fluid lubricant is used to prolong switch elements operating lifetime and desirable electrical characteristics during this lifetime. Nanoparticle materials such as noble metal particles are combined with ionic corona producing liquid organic materials to achieve a desirable contact lubricant material serving to delay the onset of several disclosed classic contact failure mechanisms. Improvement over other contact lubricant materials and favorable contact testing results are included.

Nanoparticles and corona enhanced MEMS switch apparatus

The method of the present invention utilizes atomic force microscopy techniques (AFM) for the reversible formation of nanoscale polymeric features by localized heating and mechanical deformation, generated through electrostatically mediated interactions across the polymer film between a conductive backplane and the cantilever AFM tip. This technique utilizes a selective lifting/placement of the cantilevered tip in the z direction (perpendicular to the planar surface of the polymer) to produce nanostructures of precise dimensions in contact AFM mode from regions of polymer locally heated by current flow between the cantilever AFM tip and the conductive substrate.

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Beavercreek, OH, United States of America

Richard A Vaia