413 results about "Nanocrystalline material" patented technology

A coated nanocrystal capable of light emission includes a substantially monodisperse nanoparticle selected from the group consisting of CdX, where x=S, Se, Te and an overcoating of ZnY, where Y=S, Se, uniformly deposited thereon, said coated nanoparticle characterized in that when irradiated the particles exhibit photoluminescence in a narrow spectral range of no greater than about 60 nm, and most preferably 40 nm, at full width half max (FWHM). The particle size of the nanocrystallite core is in the range of about 20 Å to about 125 Å, with a deviation of less than 10% in the core. The coated nanocrystal exhibits photoluminescence having quantum yields of greater than 30%.

The present invention discloses microfluidic modules for making nanocrystalline materials in a continuous flow process. The microfluidic modules include one or more flow path with mixing structures and one or more controlled heat exchangers to process the nanocrystalline materials and reagents in the flow path. The microfluidic modules can be interconnected to form microfluidic reactors that incorporate one or more process functions such as nucleation, growth, and purification.

A nanocrystal capable of light emission includes a nanoparticle having photoluminescence having quantum yields of greater than 30%.

A golf club (40) having a club head (42) with a face component (60) and an aft body (61) is disclosed herein. The face component (60) has a striking plate portion (72) and a return portion (74). The aft-body (61) is composed of a crown portion (62), a sole portion (64) and optionally a ribbon section (90). The face component (60) is composed of a metal material, and the aft-body (61) is composed of an injectable polymer material such as a nylon. A plating layer (300) is disposed on at least a portion of the aft-body (61). The plating layer (300) preferably comprises a nanocrystalline material. The club head (42) preferably has a volume in the range of 290 cubic centimeters to 600 cubic centimeters.

Dental articles are produced using relatively low sintering temperatures to achieve high density dental articles exhibiting strengths equal to and greater than about 700 MPa. Ceramic powders comprised of nanoparticulate crystallites are used to manufacture dental articles. The ceramic powders may include sintering agents, binders and other similar additives to aid in the processing of the ceramic powder into a dental article. The ceramic powders may be processed into dental articles using various methods including, but not limited to, injection molding, gel-casting, slip casting, or electroforming, hand, cad / camming and other various rapid prototyping methods. The ceramic powder may be formed into a suspension, pellet, feedstock material or a pre-sintered blank prior to forming into the dental article.

A fluidics apparatus for manipulation of at least one fluid sample is disclosed. A manipulation surface locates the fluid sample. A surface acoustic wave (SAW) generation material layer is provided. This is a polycrystalline material, textured polycrystalline material, biaxially textured polycrystalline material, microcrystalline material, nanocrystalline material, amorphous material or composite material. A transducer electrode structure arranged at the SAW generation material layer provides SAWs at the manipulation surface for interaction with the fluid sample. The manipulation surface has a phononic structure, for affecting the transmission, distribution and / or behaviour of SAWs at the manipulation surface. The apparatus is typically manufactured by reel-to-reel processes, to reduce the unit cost to a level at which the apparatus can be considered to be disposable after a single use.

The present invention provides a method of surface passivation of colloidal nanocrystalline materials using a ligand exchange process in which quantum nanoparticles of pre-selected size and shape has polymer multidentate ligands bound at the surface of the nanocrystals for stabilizing quantum size-dependent properties of nanocrystals and providing colloidal stability of the nanoparticles in solvents. The method includes preparing a colloidal dispersion of nanoparticles, preparing a suitable polymer multidentate ligand and dissolving said suitable polymer multidentate ligand in a fluid, the polymer multidentate ligand having first portions which can bind to a surface of the nanoparticles and a second portion which does not bind to the surface of the nanoparticles, and mixing the fluid containing the suitable polymer with the colloidal dispersion of nanoparticles under conditions suitable to induce binding of at least some of the first portions of the polymer multidentate ligand onto the surface of the nanoparticles, the suitable polymer multidentate ligand being selected so that the at least some of the first portions which bind to the surface to stabilize quantum size-dependent properties of the nanocrystals, and the second portion which does not bind to the surface provides colloidal stability of the nanoparticles in a desired fluid.

According to a first embodiment of the present invention, a magnetic tunnel junction device comprises: a free layer having a magnetization in a variable direction; a pinned layer having a magnetization in a pinned direction; and a tunnel insulation film formed between the free layer and the pinned layer, wherein the pinned layer includes a ferromagnetic film and an amorphous metal film. In addition, a magnetic device according to a second embodiment of the present invention comprises: an amorphous or nanocrystal material layer; and a perpendicular magnetic anisotropic material layer formed on the amorphous or nanocrystal material layer. The amorphous or nanocrystal material layer is a predefined amorphous material or nanocrystal material layer serving as a lower layer, and the perpendicular magnetic anisotropic material layer is formed on the amorphous or nanocrystal material layer.

The invention relates to a method of producing a strip of nanocrystalline material which is obtained from a wound ribbon that is cast in an amorphous state, having atomic composition [Fe1-a-bCoaNib]100-x-y-2-alpha-beta-gamma Cu<x>Si<y>BzNbalphaM'betaM''gamma, M' being at least one of elements V, Cr, Al and Zn, and M being at least one of elements C, Ge, P, Ga, Sb, In and Be, with: a <= 0.07 and b = 0.1, 0.5 <= x <=1.5 and 2 <= a <= 5, 10 <= y <= 16.9 and 5 <= z <= 8, beta <= 2 and gamma <= 2. According to the invention, the amorphous ribbon is subjected to crystallisation annealing, in which the ribbon undergoes annealing in the unwound state, passing through at least two S-shaped blocks under voltage along an essentially longitudinal axial direction of the ribbon, such that the ribbon is maintained at an annealing temperature of between 530 DEG C and 700 DEG C for between 5 and 120 seconds and under axial tensile stress of between 2 and 1000 Mpa. The tensile stress applied to the amorphous ribbon, the displacement speed of the ribbon during annealing and the annealing time and temperature are all selected such that the cross-section profile of the strip is not in the form of Omega and the maximum deflection of the cross-section of the strip is less than 3% of the width of the strip and preferably less than 1% of the width. The invention also relates to the strip and the core thus obtained and to the device used to implement the method.

The invention belongs to an organic metal oxide-TiO2 photocatalyst preparing process, especially relating a synthesizing method of low temperature-crystallizing nanometer TiO powder and sol with high catalytic activity. And it obtains n-titanic acid deposit by making alkali neutralization and dilution hydrolyzation or heating hydrolyzation on titanic solution, and implements synthesizing related system nano crystal materials with normal-pressure and low-temperature liquid phases by such a processing process of re-dispersing the deposit by oxydol. And it largely reduces the cost of raw materials and avoids using titanium tetrachloride with strong corrosivity, reducing equipment requirements.

Authentication systems, apparatus, and methods authenticate an identification marking including a nanocrystalline material. One or more properties of the marking are ascertained to provide a measured profile. The measured profile is compared to at least one member of a closed set of reference profiles. Each reference profile has predetermined values of one or more properties. Each reference profile is unique within the set. At least one reference profile is characteristic of an indicator material in a nanocrystalline morphology and non-characteristic of the same indicator material in a bulk morphology.

A method for making a composite electrode for a lithium ion battery comprises the steps of: preparing a slurry containing particles of inorganic electrode material(s) suspended in a solvent; preheating a porous metallic substrate; loading the metallic substrate with the slurry; baking the loaded substrate at a first temperature; curing the baked substrate at a second temperature sufficient to form a desired nanocrystalline material within the pores of the substrate; calendaring the cured composite to reduce internal porosity; and, annealing the calendared composite at a third temperature to produce a self-supporting multiphase electrode. Because of the calendaring step, the resulting electrode is self-supporting, has improved current collecting properties, and improved cycling lifetime. Anodes and cathodes made by the process, and batteries using them, are also disclosed.

A multilayer coating (MLC) is composed of two chemically different layered nanocrystalline materials, nanodiamond (nanoD) and nano-cubic boron nitride (nono-cBN). The structure of the MLC and fabrication sequence of layered structure are disclosed. The base layer is preferably nanoD and is the first deposited layer serving as an accommodation layer on a pretreated substrate. It can be designed with a larger thickness whereas subsequent alternate nano-cBN and nanoD layers are typically prepared with a thickness of 2 to 100 nm. The thickness of these layers can be engineered for a specific use. The deposition of the nanoD layer, by either cold or thermal plasma CVD, is preceded by diamond nucleation on a pretreated and / or precoated substrate, which has the capacity to accommodate the MLC and provides excellent adhesion. Nano-cBN layers are directly grown on nanodiamond crystallites using ion-assisted physical vapor deposition (PVD) and ion-assisted plasma enhanced chemical vapor deposition (PECVD), again followed by nanodiamond deposition using CVD methods in cycles until the intended number of layers of the MLC is obtained.

The invention discloses a preparation method of a core-shell structural perovskite quantum dot, which includes steps of configuring CsX and PbX2 precursor solutions respectively, mixing CsX precursor solution with PbX2 precursor solution, and generating a structure of coating CsPbX3 nano-crystal by Cs4PbX6 micro-crystal; separating and washing the compounded sediment; then dispersing the sediment in the solvent and introducing a ligand; performing membrane treatment on the solution after introducing the ligand to be a perovskite nanometer membrane; or separating again and vacuum-drying to be perovskite nanometer crystal powder. The core-shell structural perovskite nanometer crystal material can be dispersed in the organic solvent and prepared to be a quantum dot optical membrane; the quantum dot optical membrane is applied to a lighting diode liquid crystal display device and has stability to water, oxygen, heat, light and others.

An endodontic file (200) is provided particularly adapted for the removal of tooth structure, decayed or damaged nerve tissues or dentine material on the interior walls of a root canal or dentine and / or enamel from the external tooth wall. The endodontic instrument includes a shaft (202) having a shank portion (204) and a generally elongated working portion (206). The working portion preferably includes cutting or abrading features (232) adapted upon rotation and / or reciprocation of the instrument to cut, abrade or remove tissue from the interior walls of a root canal or dentine and / or enamel from the external tooth wall. The working portion extends from a proximal end (207) adjacent the shank portion to a distal end (208) terminating at a tip (250). The entire instrument and / or at least the working portion thereof is formed of an amorphous or essentially amorphous material having no or essentially no detectable crystalline structure and / or from a nanocrystalline material having an average crystalline grain size less than about 1 μm. The instrument may be formed by conventional grinding operations or by direct casting, forging or molding, in a manner producing an integral as-molded instrument having one or more sharp cutting edges. The instrument is inexpensive to manufacture and exhibits improved cutting-edge sharpness, wear resistance, lubriciousness and resistance to breakage.

The invention comprises a composite material comprising a host material in which are incorporated semiconductor nanocrystals. The host material is light-transmissive and / or light-emissive and is electrical chargetransporting thus permitting electrical charge transport to the core of the nanocrystals. The semiconductor nanocrystals emit and / or absorb light in the near infrared spectral range. The nanocrystals cause the composite material to emit / absorb energy in the near infrared (NIR) spectral range, and / or to have a modified dielectric constant, compared to the host material. The invention further comprises electro-optical devices composed of this composite material and a method of producing them. Specifically described are light emitting diodes that emit light in the NIR and photodetectors that absorb light in the same region.

The present invention discloses a nanocrystal with a quantum well energy level structure and a preparation method thereof, and a semiconductor device. The nanocrystal comprises S central structural units located at the center of the nanocrystal and N surrounding structure units arranged in order located at the outer side of the center of the nanocrystal, wherein S is not smaller than 1, and the N is not smaller than 1, the central structural units and the surrounding structure units are the quantum dot structural units, and are the gradually changing structures with energy level width changing in the vertical direction or the uniform component structures with the consistent energy level width in the vertical direction. The novel nanocrystal provided by the invention can realize the higher-efficiency nanocrystal luminous efficiency and satisfy the integrated performance requirement of the semiconductor device and the corresponding display technology for the nanocrystal, and is the ideal nanocrystal material being suitable for the semiconductor device and the display technology.

A method for making a composite electrode for a lithium ion battery comprises the steps of: preparing a slurry containing particles of inorganic electrode material(s) suspended in a solvent; preheating a porous metallic substrate; loading the metallic substrate with the slurry; baking the loaded substrate at a first temperature; curing the baked substrate at a second temperature sufficient to form a desired nanocrystalline material within the pores of the substrate; calendaring the cured composite to reduce internal porosity; and, annealing the calendared composite at a third temperature to produce a self-supporting multiphase electrode. Because of the calendaring step, the resulting electrode is self-supporting, has improved current collecting properties, and improved cycling lifetime. Anodes and cathodes made by the process, and batteries using them, are also disclosed.

An improved mixed metal oxide material suitable for use in electrochemical cells is provided. The mixed metal oxide material generally exhibits high surface area and pore volume than conventionally manufactured materials thereby imparting improved electrochemical performance. Batteries manufactured using the mixed metal oxide material are particularly suited for use in implantable medical devices.

The invention provides a method for preparing a nanocrystalline metal material containing nano-sized precipitates within a crystal. The method comprises the following steps of firstly, performing high-temperature solution treatment on a coarse crystalline metal material, thereby obtaining single phase solid solution with supersaturated and dissolved alloy element, wherein the coarse crystalline metal material contains alloy element in a matrix, and the solid solubility is reduced as the temperature is reduced; then, performing severe plastic deformation and high-pressure reverse processing at or below the room temperature, thereby obtaining single phase solid solution nanocrystalline material composed of nanocrystalline grains with supersaturated and dissolved alloy element; and finally, ageing the obtained nanocrystalline material at a pressure of 3-25 GPa and at a temperature of 100-800 DEG C, and holding the temperature for 5-8 h, thereby obtaining a nanocrystalline metal material containing nano-sized precipitates within a crystal. The method provided by the invention is wide in suitable material component range, and can be used for effectively avoiding severe plastic deformation to produce microcrack in a material, and the prepared nano-sized precipitates in the nanocrystalline material are distributed uniformly.

A nanocrystal capable of light emission includes a nanoparticle having photoluminescence having quantum yields of greater than 30%.

The invention discloses a low-temperature preparation method for a CuFeO2 crystal material of a delafossite structure, in particular to a low-temperature hydrothermal synthesis method for rapidly preparing the CuFeO2 nanocrystalline material of the delafossite structure. The method comprises the steps that parameters including reaction precursor components, the reaction temperature and the filling rate of a reaction solution in a hydrothermal reaction kettle are regulated and controlled through a low-temperature hydrothermal reaction, reactants including Cu(NO3)2 and FeCl2 react for 12 hours to 48 hours at the temperature ranging from 100 DEG C to 160 DEG C, and then, after a reaction product is processed through centrifugal cleaning and dried, the nanoscale CuFeO2 crystal material is obtained. The low-temperature preparation method for the CuFeO2 crystal material of the delafossite structure is easy to operate, the technological parameters are easy to control, no pollution is caused, the yield is high, and the method can be widely used for photoelectricity functional devices such as transparent conducting oxide.

An electrochromic device, comprising a first electrode (3), a second electrode (5) and an electrolyte (4) separating the electrodes (3, 5), where at least one of said first and second electrodes includes an electrically active structure which have an at least dual state visual appearance depending on the potential difference between the first and the second electrode.

An electrode substrate comprising M(n+1)AXn, where M is a metal of group IIIB, IVB, VB, VIB or VIII of the periodic table of elements or a combination thereof, A is an element of group IIIA, IVA, VA or VIA of the periodic table of elements or a combination thereof, X is carbon, nitrogen or a combination thereof, where n is 1, 2, or 3; and b) an electrocatalytic coating deposited on said electrode substrate, said coating being selected from at least one of b.1) a metal oxide and / or metal sulfide comprising ByC(1−y)Oz1Sz2, wherein B is at least one of ruthenium, platinum, rhodium, palladium, iridium, and cobalt, C is at least one valve metal, y is 0.4-0.9, 0<=z1, z2<=2 and z1+z2=2; b.2) a metal oxide comprising BfCgDhEi, wherein B is at least one of ruthenium, platinum, rhodium, palladium, and cobalt, C is at least one valve metal, D is iridium, E is Mo and / or W, wherein f is 0-0.25 or 0.35-1, g is 0-1, h is 0-1, i is 0-1, wherein f+g+h+i=1; b.3) at least one noble metal; b.4) any alloy or mixture comprising iron-molybdenum, iron-tungsten, iron-nickel, ruthenium-molybdenum, ruthenium-tungsten or mixtures thereof; b.5) at least one nanocrystalline material. The electrode is used in an electrolytic cell for the production of alkali metal chlorate.

The invention provides a heat treatment method for an amorphous material or a nanocrystalline material for a magnetic shield sheet. The heat treatment method comprises the following steps: a winding step of winding the amorphous strip material or the nanocrystalline strip material into magnetic cores with the needed dimensions, and a heat treatment step of arranging the amorphous magnetic cores or the nanocrystalline magnetic cores in a heat treatment furnace according to a certain rule and carrying out heat treatment, wherein magnetic field treatment is carried out during the heat treatment process. The shield performance of the magnetic shield sheet can be improved by virtue of a magnetic field-applied heat treatment process. In addition, a saturation magnetostriction constant is lowered after the magnetic field-applied heat treatment, so that the influence of stress is reduced, the magnetic conductivity is increased, the loss is reduced, and the charging efficiency is increased.