Metallic Powder Or Flake Patents (Class 977/777)
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Patent number: 7575621Abstract: A process for the production of metal nanoparticles. Nanoparticles are formed by combining a metal compound with a solution that comprises a polyol and a substance that is capable of being adsorbed on the nanoparticles. The nanoparticles are precipitated by adding a nanoparticle-precipitating liquid in a sufficient amount to precipitate at least a substantial portion of the nanoparticles and of a protic solvent in a sufficient amount to improve the separation of the nanoparticles from the liquid phase.Type: GrantFiled: January 13, 2006Date of Patent: August 18, 2009Assignee: Cabot CorporationInventors: Karel Vanheusden, Hyungrak Kiim, Aaron D. Stump, Allen B. Schult, Mark J. Hampden-Smith, Chuck Edwards, Anthony R. James, James Caruso, Toivo T. Kodas, Scott Thomas Haubrich, Mark H. Kowalski
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Publication number: 20090186275Abstract: Novel process for the preparation of finely divided, nano-structured, olivine lithium metal phosphates (LiMPO.sub.4) (where metal M is iron, cobalt, manganese, nickel, vanadium, copper, titanium and mix of them) materials have been developed. This so called Polyol” method consists of heating of suited precursor materials in a multivalent, high-boiling point multivalent alcohol like glycols with the general formula HO—(—C2H4O—).sub.n-H where n=1-10 or HO—(—C3H6O—).sub.n.-H where n=1-10, or other polyols with the general formula HOCH2—(—C3H5OH—).sub.n-H where n=1-10, like for example the tridecane-1,4,7,10,13-pentaol. A novel method for implementing the resulting materials as cathode materials for Li.-ion batteries is also developed.Type: ApplicationFiled: April 6, 2006Publication date: July 23, 2009Inventors: Ivan Exnar, Thierry Drezen
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Patent number: 7560394Abstract: A nanodot material including nanodots formed on silicon oxide, and a method of manufacturing the same, is provided. The nanodot material includes a substrate, a silicon oxide layer, and a plurality of nanodots on the silicon oxide layer.Type: GrantFiled: July 18, 2005Date of Patent: July 14, 2009Assignee: Samsung Electronics Co., Ltd.Inventors: Young-soo Park, Wan-jun Park, Alexander Alexandrovich Saranin, Andrey Vadimovich Zotov
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Patent number: 7556863Abstract: A process of preparing gold-coated magnetic nanoparticles is disclosed and includes forming a suspension of magnetic nanoparticles within a suitable liquid, adding an amount of a reducible gold compound and a reducing agent to the suspension, and, maintaining the suspension for time sufficient to form gold-coated magnetic nanoparticles.Type: GrantFiled: June 5, 2007Date of Patent: July 7, 2009Assignee: Los Alamos National Security, LLCInventors: Douglas E. Berning, Robert H. Kraus, Jr., Robert W. Atcher, Jurgen G. Schmidt
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Publication number: 20090155630Abstract: A method of producing alloy nanoparticles includes the steps of: adding a metallic salt, a reducing agent, a stabilizing ligand, and an organic iron complex to an organic solvent selected from the group consisting of 2-20C hydrocarbon, alcohol, ether, and ester in an inert gas atmosphere to obtain a reaction liquid; and stirring the reaction liquid while heating the reaction liquid to a predetermined temperature. The grain diameter of the alloy nanoparticle is controlled by regulating the amount of the stabilizing ligand.Type: ApplicationFiled: January 31, 2005Publication date: June 18, 2009Inventors: Satoru Momose, Hiroyoshi Kodama, Nobutaka Ihara, Takuya Uzumaki
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Patent number: 7547344Abstract: Nanoparticles of intermetallic alloys such as FeAl, Fe3Al, NiAl, TiAl and FeCoV exhibit a wide variety of interesting structural, magnetic, catalytic, resistive and electronic, and bar coding applications. The nanosized powders can be used to make structural parts having enhanced mechanical properties, magnetic parts having enhanced magnetic saturation, catalyst materials having enhanced catalytic activity, thick film circuit elements having enhanced resolution, and screen printed images such as magnetic bar codes having enhanced magnetic properties. In contrast to bulk FeAl materials which are nonmagnetic at room temperature, the FeAl nanoparticles exhibit magnetic properties at room temperature.Type: GrantFiled: May 7, 2004Date of Patent: June 16, 2009Assignee: Philip Morris USA Inc.Inventors: Seetharama C. Deevi, A. Clifford Lilly, Jr.
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Patent number: 7531149Abstract: A general, reproducible, and simple synthetic method that employs readily available chemicals permits control of the size, shape, and size distribution of metal oxide nanocrystals. The synthesis entails reacting a metal fatty acid salt, the corresponding fatty acid, and a hydrocarbon solvent, with the reaction product being pyrolyzed to the metal oxide. Nearly monodisperse oxide nanocrystals of Fe3O4, Cr2O3, MnO, Co3O4, NiO, ZnO, SnO2, and In2O3, in a large size range (3-50 nm), are described. Size and shape control of the nanocrystals is achieved by varying the reactivity and concentration of the precursors.Type: GrantFiled: August 16, 2005Date of Patent: May 12, 2009Assignee: The Board of Trustees of the University of ArkansasInventors: Xiaogang Peng, Yongfen Chen, Nikhil Jana, Arun Narayanaswamy
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Publication number: 20090108233Abstract: A method for preparing a suspension of LDH particles comprises the steps of preparing LDH precipitates by coprecipitation to form a mixture of LDH precipitates and solution; separating the LDH precipitates from the solution; washing the LDH precipitates to remove residual ions; mixing the LDH precipitates with water; and subjecting the mixture of LDH particles and water from step (d) to a hydrothermal treatment step by heating to a temperature of from greater than 80° C. to 150° C. for a period of about 1 hour to about 144 hours to form a well dispersed suspension of LDH particles in water.Type: ApplicationFiled: December 12, 2005Publication date: April 30, 2009Applicant: The Univeristy of QueenslandInventors: Gaoqing Lu, Zhiping Xu
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Patent number: 7524351Abstract: A nano-sized metal particle composition includes a first metal that has a particle size of about 20 nanometer or smaller. The nano-sized metal particle can include a second metal that forms a shell about the first metal. A microelectronic package is also disclosed that uses the nano-sized metal particle composition. A method of assembling a microelectronic package is also disclosed. A computing system is also disclosed that includes the nano-sized metal particle composition.Type: GrantFiled: September 30, 2004Date of Patent: April 28, 2009Assignee: Intel CorporationInventors: Fay Hua, C. Michael Garner
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Patent number: 7520915Abstract: There is provided a method of preparing nano scale nickel powders by wet reducing process. An embodiment of the method of preparing nickel powders comprises preparing the first solution formed by mixing water and a base, preparing the second solution formed by mixing a polyol and a nickel compound, preparing a mixture by mixing the first solution and the second solution, heating the mixture, and separating the nickel powders generated during heating.Type: GrantFiled: May 20, 2005Date of Patent: April 21, 2009Assignee: Samsung Electro-mechanics Co., Ltd.Inventors: Seon-mi Yoon, Jae-young Choi, Yong-kyun Lee, Yulia Potapova
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Patent number: 7504082Abstract: Magnetic nanoparticles are applicable in imaging, diagnosis, therapy, and biomaterial separation. The magnetic nanoparticles are represented as (FewGdx)vZy, wherein w is from 99.9% to 97.5%, x is from 0.1% to 2.5%, Z is an element of the group VIa, and v, y are positive numbers.Type: GrantFiled: January 20, 2006Date of Patent: March 17, 2009Assignee: Industrial Technology Research instituteInventors: Hui-Ju Cho, Sheng-Ming Shih, Yuh-Jiuan Lin, Hong-Dun Lin, Kang-Ping Lin
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Patent number: 7504152Abstract: A flash CVD process can be employed to grow micron- and nano-sized tree-like structures, particularly carbon structures on graphite electrodes. This process involves fast cyclic resistive heating of electrodes in an atmosphere of inert gas and hydrocarbons at below atmospheric pressure.Type: GrantFiled: February 17, 2004Date of Patent: March 17, 2009Assignee: Rensselaer Polytechnic InstituteInventors: Richard W. Siegel, John M. Nugent, Pulickel M. Ajayan
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Patent number: 7498005Abstract: Rare earth compositions comprising nanoparticles are described along with various nanotechnology applications of such nanoparticles. The compositions of the nanomaterials discussed may include scandium (Sc), yttrium (Y), lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), and lutetium (Lu).Type: GrantFiled: May 21, 2007Date of Patent: March 3, 2009Assignee: PPG Industries Ohio, Inc.Inventor: Tapesh Yadav
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Patent number: 7494608Abstract: A composition comprising a liquid and a plurality of silver-containing nanoparticles with a stabilizer, wherein the silver-containing nanoparticles are a product of a reaction of a silver compound with a reducing agent comprising a hydrazine compound in the presence of a thermally removable stabilizer in a reaction mixture comprising the silver compound, the reducing agent, the stabilizer, and an organic solvent wherein the hydrazine compound is a hydrocarbyl hydrazine, a hydrocarbyl hydrazine salt, a hydrazide, a carbazate, a sulfonohydrazide, or a mixture thereof and wherein the stabilizer includes an organoamine.Type: GrantFiled: August 10, 2007Date of Patent: February 24, 2009Assignee: Xerox CorporationInventors: Yuning Li, Yiliang Wu, Beng S Ong
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Publication number: 20090047512Abstract: A method of forming a thin film of metal nanoparticles useful in optics and electronics includes producing a mono-layer of dispersed metal nanoparticles substantially free of stabilizing ligands. Mixing a polymer solution with a metal salt to create a metal precursor solution. Forming the metal precursor solution into a film by removal of solvent, and heating the film to reduce the metal salt and form metal nanoparticles. Further heating the film to remove the polymer solution and form a monolayer of dispersed metal nanoparticles.Type: ApplicationFiled: June 6, 2006Publication date: February 19, 2009Inventor: Jeffrey L. Conroy
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Patent number: 7491448Abstract: A nano-particulate reticulated foam-like structure, which includes particles having a size of 10-200 nanometers. The particles are joined together to form a reticulated foam-like structure. The reticulated foam-like structure is similar to the structure of carbon nano-foam. The nano-particulate reticulated foam-like structure may comprise a metal, such as a hydrogen storage ahoy, either a gas-phase thermal or an electrochemical hydrogen storage alloy. The nano-particulate reticulated foam-like structure may alternatively comprise a hydroxide such as nickel hydroxide or manganese hydroxide or an oxide, such as a silver oxide or a copper oxide. When the nano-particulate reticulated foam-like structure is a hydrogen storage alloy, the material exhibits substantial immunity to hydrogen cycling decrepitation and an increase in the reversible hydrogen storage capacity by reduction of trapped hydrogen by at least 10% as compared to the same alloy in bulk form.Type: GrantFiled: January 5, 2006Date of Patent: February 17, 2009Assignee: Energy Conversion Devices, Inc.Inventors: Stanford R. Ovshinsky, Marshall D. Muller, Lin R. Higley
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Patent number: 7479325Abstract: An isotope-doped carbon nanotube (40) includes at least two kinds of carbon nanotube segments, each kind of carbon nanotube segment having a unique carbon isotope. The at least two kinds of carbon nanotube segments are arranged along a longitudinal direction of the carbon nanotube alternately or non-alternately. The carbon isotope is selected from the group consisting of a carbon-12 isotope, a carbon-13 isotope and a carbon-14 isotope. Three preferred methods employ different single isotope sources to form isotope-doped carbon nanotubes. In a chemical vapor deposition method, different isotope source gases are alternately or non-alternately introduced. In an arc discharge method, a power source is alternately or non-alternately switched between different isotope anodes. In a laser ablation method, a laser is alternately or non-alternately focused on different isotope targets.Type: GrantFiled: September 28, 2007Date of Patent: January 20, 2009Assignees: Tsinghua University, Hon Hai Precision Industry Co., Ltd.Inventors: Shou-Shan Fan, Liang Liu
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Patent number: 7476695Abstract: There is provided a stable sol comprising modified stannic oxide-zirconium oxide complex colloidal particles, wherein the particles are formed by coating as nuclei stannic oxide-zirconium oxide complex colloidal particles in which stannic oxide colloidal particles obtained by a reaction of metal tin, an organic acid and hydrogen peroxide is bonded to zirconium oxide colloidal particles with tungsten oxide-stannic oxide-silicon dioxide complex colloidal particles. The sol has a high refractive index and is improved in water resistance, moisture resistance and weather resistance, and can be used by mixing with a hard coating paint as a component for improving properties of a hard coating film applied on a plastic lens surface.Type: GrantFiled: March 9, 2005Date of Patent: January 13, 2009Assignee: Nissan Chemical Industries, Ltd.Inventors: Yoshinari Koyama, Motoko Asada
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Patent number: 7455823Abstract: The invention discloses methods for making micron/nano meter sized particles of various inorganic materials such as minerals/oxides/sulphides/metals/ceramics at a steadily expanding liquid-liquid interface populated by suitable surfactant molecules that spontaneously organize themselves into superstructures varying over large length-scales. This experiment is realized in a radial Hele-Shaw cell where the liquid-liquid interfacial growth rate and consequently time scales such as arrival of surfactant molecules to the interface, the hydrodynamic flow effect to modulate the material organization into super structures at the dynamic charged interface.Type: GrantFiled: February 23, 2006Date of Patent: November 25, 2008Assignee: Council of Scientific & Industrial ResearchInventors: Sastry Murali, Rautaray Debabrata
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Publication number: 20080264259Abstract: A filtration medium includes a fine filter layer having a plurality of nanofibers and a coarse filter layer having a plurality of microfibers attached to the fine filter layer. The coarse filter layer is positioned proximal to a direction of fluid flow, and the fine filter layer is positioned distal to the direction of fluid flow.Type: ApplicationFiled: April 26, 2007Publication date: October 30, 2008Inventor: Wallace W. Leung
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Patent number: 7442227Abstract: A non-oxide powder of which at least about 40% by mass is comprised of a plurality of tightly agglomerated compositions, each of the tightly agglomerated compositions comprising a plurality of primary particles agglomerated together. Suitable materials for the primary particles include metals, intermetallics, ceramics, MMCs, and non-metals. An encapsulation and scavenging process is used to create the agglomerated compositions wherein at least some of the agglomerated compositions are encapsulated in a secondary material such as a salt or a polymer.Type: GrantFiled: October 9, 2001Date of Patent: October 28, 2008Assignee: Washington UnniversityInventors: Lee J. Rosen, Richard L. Axelbaum, Zhen Sun, Douglas P. DuFaux
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Publication number: 20080245184Abstract: Disclosed is a method for preparing metal nanoparticles, the method comprising the steps of: providing a solution of metal salt and a solution of a strong reducing agent with a standard reduction potential of ?0.23V or lower; and mixing the solutions by using a micro mixer without supplying additional heat energy from the exterior, while carrying out reduction of the metal. Metal nanoparticles obtained by the above method, and a micro mixer for preparing the metal nanoparticles are also disclosed. The method for preparing metal nanoparticles via the reduction of metal ions in a solution uses a strong reducing agent and a micro mixer. Therefore, it is possible to obtain metal nanoparticles having a particle size of 20 nm or more and a uniform shape and dimension without supplying additional heat energy from the exterior. Additionally, the method is amenable to a continuous process, and thus ensures cost-efficiency and stable product quality required for mass production.Type: ApplicationFiled: June 14, 2007Publication date: October 9, 2008Inventors: Woo Ram Lee, Jae Hoon Choe, Jung Hyun Seo, Yoo Seok Kim
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Publication number: 20080248307Abstract: Group IV semiconductor nanoparticles that have been stably passivated with an organic passivation, layer, methods for producing the same, and compositions utilizing stably passivated. Group IV semiconductor nanoparticles are described. In some embodiments, the stably passivated Group IV semiconductor nanoparticles are luminescent Group IV semiconductor nanoparticles with high photoluminescent quantum yields. The stably passivated Group IV semiconductor nanoparticles can be used in compositions useful in a variety of optoelectronic devices.Type: ApplicationFiled: February 8, 2008Publication date: October 9, 2008Inventors: David Jurbergs, Elena V. Rogojina
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Publication number: 20080232996Abstract: “The present invention relates to a method for fabricating parts by an injection molding technique including preparing a feedstock—having at least one powder mixed with a polymer binder solubilized in a solvent, injecting the feedstock into the mold under pressure, debinding, and sintering where the feedstock is maintained at a temperature above a solvent vaporization temperature during the pressing.Type: ApplicationFiled: February 26, 2008Publication date: September 25, 2008Applicant: COMMISSARIAT A L'ENERGIE ATOMIQUEInventors: LUC FEDERZONI, PASCAL REVIRAND
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Patent number: 7422730Abstract: The present invention provides ?-alumina powders comprising ?-alumina particles of which at least 80% of the ?-alumina particles have a particle size of less than 100 nm. The invention also provides slurries, particularly aqueous slurries, which comprise ?-alumina powders of the invention. The invention further provides methods of manufacturing ?-alumina powders and ?-alumina slurries of the invention and methods of polishing using same.Type: GrantFiled: April 2, 2003Date of Patent: September 9, 2008Assignee: Saint-Gobain Ceramics & Plastics, Inc.Inventor: Yuhu Wang
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Publication number: 20080191828Abstract: A method is proposed for opening of hollow structures made of magnetic nanoparticles. To avoid an unwanted heating, the hollow structures are opened by a strong, preferably rotating magnetic field. The method can be used, in particular, for the releasing of a diagnostic and/or therapeutic agent in a human or animal body.Type: ApplicationFiled: May 9, 2006Publication date: August 14, 2008Applicant: UNIVERSITÄT DUISBURG-ESSENInventors: Markus Gruner, Alfred Hucht, Peter Entel, Michael Farle
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Patent number: 7405002Abstract: Nanoparticles and methods of making nanoparticles are provided. The nanoparticles may include semiconductor nanocrystals. A shell may encapsulate a nanoparticle core, and the shell may include non-organic material and may be silica. The shell may also include additional species such as PEG. In some embodiments, a passivation layer is in contact with the core.Type: GrantFiled: August 4, 2004Date of Patent: July 29, 2008Assignee: Agency for Science, Technology and ResearchInventors: Jackie Y. Ying, Subramanian T. Selvan, Timothy T. Tan
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Publication number: 20080175936Abstract: The present invention provides a nano-precision sintering system 1 for sintering a nano-sized powder of a material in the pulse energization and pressure sintering process to obtain a highly purified sintered compact having a nano-sized grain structure, said nano-precision sintering system 1 comprising: at least one pre-process chamber 20 defined by at least one sealed housing 21 having at least one glove and designed to be controlled into a predetermined atmosphere; a sintering process chamber 30 defined by a sealed housing 31 having at least one glove and designed to be controlled into a predetermined atmosphere; a shut-off system 26 disposed in a passage providing communication between the pre-process chamber and the sintering process chamber so as to block the communication between the two chambers selectively while keeping it in an air tight condition; and a pulse energization and pressure sintering machine 50 having a vacuum chamber “C” allowing for the sintering process to be carried out under a vacuumType: ApplicationFiled: November 2, 2005Publication date: July 24, 2008Inventors: Masao Tokita, Shinichi Suzuki, Katsuyuki Nakagawa
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Publication number: 20080164141Abstract: A method for producing metal-containing nanoparticles. The method includes combining a metal organic compound selected from metal acetates, metal acetyl acetonates, and metal xanthates with an amine to provide a solution of metal organic compound in the amine. The solution is then irradiated with a high frequency radiation source to provide metal nanoparticles having the formula (Aa)m(Bb)nXx, wherein each of A and B is selected from a metal, X is selected from the group consisting of oxygen, sulfur, selenium, phosphorus, halogen, and hydroxide, subscripts a, b, and x represent compositional stoichiometry, and each of m and n is greater than or equal to zero, with the proviso that at least one of m and n is greater than zero.Type: ApplicationFiled: January 8, 2007Publication date: July 10, 2008Inventors: Mohamed Samy Sayed El-Shall, Tze-Chi Jao, Allen A. Aradi, Asit Baran Panda
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Patent number: 7396589Abstract: Magnetic nanoparticles are applicable in imaging, diagnosis, therapy, and biomaterial separation. The magnetic nanoparticles comprise a core represented as FexMavZy and a shell of an inner-transition element Mb or the compound thereof, wherein Ma is an inner-transition element, Z is an element of the group Vla, x is greater or equal to 0, and v, y are positive numbers. The surface of the shell is optionally modified by liposome, polymer, aliphatic compound, aromatic compound or combinations thereof.Type: GrantFiled: March 19, 2007Date of Patent: July 8, 2008Assignee: Industrial Technology Research InstituteInventors: Hui-Ju Cho, Sheng-Ming Shih, Yuh-Jiuan Achuan Lin, Hong-Dun Lin, Kang-Ping Lin
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Publication number: 20080158501Abstract: To provide a polarizing plate including a polarizing layer containing anisotropic metal nanoparticles produced by reducing a metal ion in a liquid crystal matrix. An embodiment in which the liquid crystal matrix is characterized in that molecules of a liquid crystal compound are fixed in an alignment state of any one of substantially horizontal alignment, substantially vertical alignment, diagonal alignment, hybrid alignment and spiral alignment; an embodiment in which the reduction is at least one of photoreduction, thermal reduction and chemical reduction; and the like are favorable.Type: ApplicationFiled: December 21, 2007Publication date: July 3, 2008Applicant: FUJIFILM CorporationInventors: Yuki Matsunami, Koh Kamada
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Patent number: 7393516Abstract: A method of preparing metal chalcogenides from elemental metal or metal compounds has the following steps: providing at least one elemental metal or metal compound; providing at least one element from periodic table groups 13-15; providing at least one chalcogen; and combining and heating the chalcogen, the group 13-15 element and the metal at sufficient time and temperature to form a metal chalcogenide. A method of functionalizing the surface of semiconducting nanoparticles has the following steps: providing at least one metad compound; providing one chalcogenide having a cation selected from the group 13-15 (B, Al, Ga, In, Si, Ge, Sn, Pb, P, As, Sb and Bi); dissolving the chalcogenide in a first solution; dissolving the metal compound in a second solution; providing and dissolving a functional capping agent in at least one of the solutions of the metal compounds and chalcogenide; combining all solutions; and maintaining the combined solution at a proper temperature for an appropriate time.Type: GrantFiled: February 2, 2004Date of Patent: July 1, 2008Inventors: Dong-Kyun Seo, Nora Iancu, Liming Wu
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Patent number: 7390568Abstract: A semiconductor nanocrystal heterostructure has a core of a first semiconductor material surrounded by an overcoating of a second semiconductor material. Upon excitation, one carrier can be substantially confined to the core and the other carrier can be substantially confined to the overcoating.Type: GrantFiled: August 12, 2003Date of Patent: June 24, 2008Assignee: Massachusetts Institute of TechnologyInventors: Sungjee Kim, Moungi G. Bawendi
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Patent number: 7381239Abstract: Disclosed are alloy nano-particles having a fluctuation coefficient of particle size of 20% or less and a fluctuation coefficient of composition of 20% or less. The alloy nano-particles have a low transformation point and hardly aggregate and which can form a flat magnetic film having high coercive force.Type: GrantFiled: June 25, 2004Date of Patent: June 3, 2008Assignee: Fujifilm CorporationInventors: Koukichi Waki, Genichi Furusawa, Yasushi Hattori
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Patent number: 7381465Abstract: A core-shell structure comprises a core (2) comprising nanoparticles and a shell (4) coating the core (2), and its void space (3) formed by the core (2) and the shell (4) is controlled. A method of preparing the core-shell structure comprises: forming particles comprising a photoetchable semiconductor, metal or polymer and coating the particles with a shell (4) comprising a non-photoetchable semiconductor, metal or polymer, to form a core-shell structure (5); and irradiating the core-shell structure with a light having a controlled wavelength in the photoetching solution to form an adjustable void space inside a shell (3) within the core-shell structure by the size-selective photoetching method. The core-shell structure allows the preparation of a catalyst exhibiting an extremely high efficiency, and can be used as a precursor for preparing a nanomaterial required for a nanodevice.Type: GrantFiled: February 17, 2003Date of Patent: June 3, 2008Assignee: Japan Science and Technology AgencyInventors: Tsukasa Torimoto, Bunsho Ohtani, Kentaro Iwasaki
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Patent number: 7381240Abstract: Nanometer to micrometer sized particles containing platinum and having selected morphologies are prepared by a sonochemical process. A compound of platinum is dissolved, suspended, or diluted in a suitable liquid medium at a predetermined concentration and the liquid is maintained at a predetermined temperature from sub-ambient temperatures to above ambient temperatures. A reducing gas is bubbled through the liquid as it is subjected to cavitation at a controlled power to affect the reductive decomposition of the platinum compound. The morphology of the precipitated platinum particles can be varied widely by varying the described concentration, temperature and power parameters.Type: GrantFiled: November 16, 2006Date of Patent: June 3, 2008Assignee: GM Global Technology Operations, Inc.Inventors: Michael K. Carpenter, Ion C. Halalay
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Publication number: 20080117357Abstract: An exemplary liquid crystal display (200) includes a liquid crystal panel (210) and a backlight module (220). The backlight module is positioned for illuminating the liquid crystal panel, and includes a light source (222) and at least one optical member (221). The at least one optical member includes absorbing material for absorbing light beams having wavelength more than 700 nanometers, such that when light beams provided by the light source transmit through the at least one optical member, at least some of the light beams having wavelengths more than 700 nanometers are absorbed by the absorbing material.Type: ApplicationFiled: November 19, 2007Publication date: May 22, 2008Inventor: Jui-Hua Hsieh
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Patent number: 7374824Abstract: Tellurium-containing nanocrystallites are produced by injection of a precursor into a hot coordinating solvent, followed by controlled growth and annealing. Nanocrystallites may include CdTe, ZnTe, MgTe, HgTe, or alloys thereof. The nanocrystallites can photoluminesce with quantum efficiencies as high as 70%.Type: GrantFiled: April 7, 2006Date of Patent: May 20, 2008Assignee: Massachusetts Institute of TechnologyInventors: Moungi G. Bawendi, Frederic V. Mikulec, Sungjee Kim
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Patent number: 7374597Abstract: A process of making metal nanoparticles comprising the steps of: providing a precursor composition comprising at least one metallic compound and at least one organic compound; wherein the organic compound is selected from the group consisting of an ethynyl compound, a metal-ethynyl complex, and combinations thereof; wherein the precursor composition is a liquid or solid at room temperature; and heating the precursor composition under conditions effective to produce metal nanoparticles. A metal nanoparticle composition comprising metal nanoparticles dispersed homogenously in a matrix selected from the group consisting of ethynyl polymer, crosslinked ethynyl polymer, amorphous carbon, carbon nanotubes, carbon nanoparticles, graphite, and combinations thereof.Type: GrantFiled: June 24, 2004Date of Patent: May 20, 2008Assignee: The United States of America as represented by the Secretary of the NavyInventors: Teddy M. Keller, Syed B. Qadri
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Patent number: 7371457Abstract: The present invention is for particulate compositions and methods for producing them that can absorb or scatter electromagnetic radiation. The particles are homogeneous in size and are comprised of a nonconducting inner layer that is surrounded by an electrically conducting material. The ratio of the thickness of the nonconducting layer to the thickness of the outer conducting shell is determinative of the wavelength of maximum absorbance or scattering of the particle. Unique solution phase methods for synthesizing the particles involve linking clusters of the conducting atoms, ions, or molecules to the nonconducting inner layer by linear molecules. This step can be followed by growth of the metal onto the clusters to form a coherent conducting shell that encapsulates the core.Type: GrantFiled: January 6, 2004Date of Patent: May 13, 2008Assignee: William Marsh Rich UniversityInventors: Steven J. Oldenburg, Richard D. Averitt, Nancy J. Halas
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Patent number: 7361410Abstract: Modified and functionalized metallic nanoclusters capable of providing an enhanced Raman signal from an organic Raman-active molecule incorporated therein are provided. For example, modifications include coatings and layers, such as adsorption layers, metal coatings, silica coatings, and organic layers. The nanoclusters are generally referred to as COINs (composite organic inorganic nanoparticles) and are capable of acting as sensitive reporters for analyte detection. A metal that enhances the Raman signal from the organic Raman-active compound is inherent in the nanocluster. A variety of organic Raman-active compounds and mixtures of compounds can be incorporated into the nanocluster.Type: GrantFiled: September 13, 2004Date of Patent: April 22, 2008Assignee: Intel CorporationInventors: Jingwu Zhang, Xing Su, Lei Sun
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Publication number: 20080091054Abstract: A method of synthesizing air-stable nano-scale zero-valent iron (NZVI) particles at room temperature is provided. Also, a method of treating environmental pollutants using nano-scale zero-valent iron synthesized by the above method is provided. According to the method, air-dried NZVI is very effective in removing pollutants such as arsenic, and the method is simple, cost-effective, environmentally friendly, and can stabilize the NZVI in air for more than 10 months.Type: ApplicationFiled: August 17, 2007Publication date: April 17, 2008Inventors: Hee-Chul Choi, Abul Bashar Mohammad Giasuddin, Sushil Raj Kanel
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Publication number: 20080078267Abstract: A process of making metal nanoparticles comprising the steps of: providing a precursor composition comprising at least one metallic compound and at least one organic compound; wherein the organic compound is selected from the group consisting of an ethynyl compound, a metal-ethynyl complex, and combinations thereof; wherein the precursor composition is a liquid or solid at room temperature; and heating the precursor composition under conditions effective to produce metal nanoparticles. A metal nanoparticle composition comprising metal nanoparticles dispersed homogenously in a matrix selected from the group consisting of ethynyl polymer, crosslinked ethynyl polymer, amorphous carbon, carbon nanotubes, carbon nanoparticles, graphite, and combinations thereof.Type: ApplicationFiled: June 24, 2004Publication date: April 3, 2008Inventors: Teddy M. Keller, Syed B. Qadri
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Publication number: 20080072706Abstract: The present invention relates to a method for manufacturing copper nanoparticles, in particular, to a method for manufacturing copper nanoparticles, wherein the method includes preparing a mixture solution including a copper salt, a dispersing agent, a reducing agent and an organic solvent; raising temperature of the mixture solution up to 30-50° C. and agitating; irradiating the mixture solution with microwaves; and obtaining the copper nanoparticles by lowering temperature of the mixture solution. According to the present invention, several tens of nm of copper nanoparticles having a narrow particle size distribution and good dispersibility can be synthesized in mass production.Type: ApplicationFiled: August 27, 2007Publication date: March 27, 2008Inventors: Young-Il Lee, Jae-Woo Joung
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Patent number: 7347885Abstract: A process of making metal nanoparticles comprising the steps of: providing a precursor composition comprising at least one metallic compound and at least one organic compound; wherein the organic compound is selected from the group consisting of an ethynyl compound, a metal-ethynyl complex, and combinations thereof; wherein the precursor composition is a liquid or solid at room temperature; and heating the precursor composition under conditions effective to produce metal nanoparticles. A metal nanoparticle composition comprising metal nanoparticles dispersed homogenously in a matrix selected from the group consisting of ethynyl polymer, crosslinked ethynyl polymer, amorphous carbon, carbon nanotubes, carbon nanoparticles, graphite, and combinations thereof.Type: GrantFiled: June 24, 2004Date of Patent: March 25, 2008Assignee: The United States of America as represented by the Secretary of the NavyInventors: Teddy M. Keller, Syed B. Qadri
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Method producing metal nanopowders by decompositon of metal carbonyl using an induction plasma torch
Publication number: 20070277648Abstract: A process for synthesizing metal nanopowders by introducing metal carbonyl into an induction plasma torch. By taking advantage of the much lower dissolution temperature of carbonyl as opposed to the high melting temperature of conventional metal powder feeds less torch power is required. Moreover, in contrast to current powder production techniques utilizing electrode based plasma torches, the induction plasma torch does not introduce contaminants into the nanopowder.Type: ApplicationFiled: June 1, 2006Publication date: December 6, 2007Applicants: INCO LIMITED, TEKNA PLASMA SYSTEMS INC.Inventors: Vladimir Paserin, Richard S. Adams, Maher I. Boulos, Jerzy Jurewicz, Jiayin Guo -
Patent number: 7268269Abstract: A reactive and adsorptive (i.e., multi-functional protective) textile and methods for constructing and using same which possess at least chemically reactive and biocidal properties. Nanoparticles from different classes such as metal oxides, metal hydroxides, metal hydrates and POMs are incorporated into elements which can be utilized in a wide variety of protective materials. The nanoparticles may be treated to reduce water solubility or combined with halogens, alkali metals or secondary metal oxides to specifically engineer the nanoparticle to address a particular chemical or biocidal threat.Type: GrantFiled: June 8, 2004Date of Patent: September 11, 2007Assignee: Gentex CorporationInventors: Holly C. Axtell, Scott M. Hartley, Robert A. Sallavanti
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Publication number: 20070180954Abstract: The present invention relates to copper nano-particles having controlled particle size, high monodispersity, and oxidation stability, a method of preparing the copper nano-particles, and a method of forming a copper coating film using the copper nano-particles. The present invention provides a method of preparing copper nano-particles, comprising mixing a copper salt solution with a mixture of a reducing agent and a solvent; where the copper salt solution is added to the mixture at a temperature of 300° C. or less so that the copper salt solution can react with the mixture. It is thus possible to obtain copper nano-particles with controlled particle size and monodispersity by inducing uniform nucleation and nucleus growth through control of the reaction rate and/or the amount of copper ions during synthesis of the copper nano-particles.Type: ApplicationFiled: December 5, 2006Publication date: August 9, 2007Applicants: SAMSUNG ELECTRONICS, CO. LTD., INDUSTRY-ACADEMIC COOPERATION FOUNDATION, YONSEI UNIVERSITYInventors: Jang Sub KIM, Joo Ho MOON, Sun Ho JEONG, Dong Jo KIM, Bong Kyun PARK
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Patent number: 7241814Abstract: A method for the preparation of a dispersion of fine particles characterized in that the micelles are ones which have been formed in a aqueous medium with an amphiphilic block copolymer represented by the general formula PB and in which the shell of each micelle has been cross-linked with hydrophilic groups of the hydrophilic side chains wherein the particles formed are metallic particles having a reducing characteristic of metal ions.Type: GrantFiled: July 12, 2002Date of Patent: July 10, 2007Assignee: Japan Science and Technology AgencyInventors: Hideki Sakurai, Takanobu Sanji
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Patent number: 7238331Abstract: The present invention discloses a process for producing nano-powders and powders of nano-particle loose aggregate, which includes: (a) providing at least two reactant solutions A and B capable of rapidly reacting to form deposits; (b) supplying the at least two reactant solutions A and B at least at the reaction temperature into a mixing and reaction precipitator respectively, in which mixing reaction and precipitation are continuously carried out in sequence, the mixing and reaction precipitator being selected from at least one of a tubular ejection mixing reactor, a tubular static mixing reactor and an atomization mixing reactor; and (c) treating the deposit-containing slurry continuously discharged from the mixing reaction precipitator.Type: GrantFiled: July 26, 2002Date of Patent: July 3, 2007Assignee: Anshan University of Science and TechnologyInventors: Yingyan Zhou, Shoushan Gao, Kaiming Wang, Chuangeng Wen, Xiaoqi Li