rexresearch.com

Alchemy Index


Nanoparticle Gold / Silver Preparation Patents








European Patent Office Advanced Search Results :

http://ep.espacenet.com/advancedSearch?locale=en_EP



Method of Producing Gold Nanoparticle

US2004261574
2004-12-30

Inventor: LIN HSING KUANG (US); WALSH DANIEL EDWARD (US)
Classification:  - international: B22F1/00; B22F9/20; B22F1/00; B22F9/16; (IPC1-7): B22F9/00; - European: B22F1/00A2B4; B22F9/20; Y01N6/00
Also published as:  US7060121 (B2)
Abstract ---  A method for producing gold nanoparticles is disclosed. When gold salt solution is mixed with an absorbent, gold in the form of complexes is adsorbed onto the surface of the absorbent. The gold-loaded absorbent, after being separated from the solution by screening, filtration, settling or other methods, is ashed to form ashes. The ashes contain gold nanoparticles and impurities such as oxides of sodium, potassium and calcium. The impurities can be removed by dissolution using dilute acids. The relatively pure gold nanoparticles are obtained after the impurities are removed. Activated carbon or gold-adsorbing resin can be used as the absorbent. Silver or platinum group metal nanoparticles can also be produced by this method.


Process for Preparing Gold Nano Particle...
CN101015862
2007-08-15

Inventor: FANG YUN XIA (CN)
Applicant: SOUTHERN YANGTZE UNIVERSITY (CN)
Classification:  - international: B22F9/24; B22F9/16;
Abstract --- A method for preparing gold nanometer particles via water-phase soft template method uses water-phase soft template method, the soft group formed by carbowax (PEG) and dodecyl sodium sulfate (SDS) as soft template, mixes the water solution of chlorauric acid (HAuCl4) and said soft group, uses PEG as reducer to reduce the gold ion into gold nanometer particles in special shape and size. In reaction, the soft template and reaction period can control the size and shape of gold nanometer particles. And the reactant via high-speed eccentric treatment, deposition and washed via water to obtain the gold nanometer ball, tablet, ring or arc. The invention is characterized in narrow size and size distribution, with simple operation on shape control.


Nanometer Gold Water Solution Dispersing Method
TW281876B
2007-06-01

Inventor: WANG MING-JENG (TW)
Applicant: WANG MING-JENG (TW)
Classification:  - international: B01F3/12; B01F3/12;
Abstract ---  There is provided a nanometer gold water solution dispersing method, which is characterized in dissolving gold of smaller than 5 nanometers into water of 33 to 37 DEG C, so that the content of gold in the water solution is less than 100 ppm; and using a pressure pump to apply a shock of 50 pound/cm<2> on the water solution to fully dispense the gold in the water solution.


Method for Preparing Polypodia Shaped Au Nanoparticle using Microwave...
CN1994634
2007-07-11

Inventor: FANG YUN XIA (CN)
Applicant: SOUTHERN YANGTZE UNIVERSITY (CN)
Classification:  - international: B22F9/24; B22F9/16;
Abstract --- The invention uses microwave accelerating water-phase soft template method to prepare multi-foot gold nanometer particles, wherein it uses polyvinyl pyrrolidon (PVP) and sodium dodecyl sulfate (SDS0 to form soft group as soft template; mixes water solution with chlorauric acid (HAuCl4) with said soft group; under microwave radiation, using sodium citrate as reducer to quickly reduce gold ion into multi-food gold nanometer particles; in the reaction, the soft template formed by PVP and SDS will control the shape and size of gold nanometer particles; high-speed eccentrically treating the reaction product, depositing and washing with water to obtain the multi-food gold nanometer particles at 20-50mm and narrow diameter distribution. The invention has low consumption of surface activator, short process, simple separation and easy preparation.


Process for Nano Colloid Gold...
CN1979166
2007-06-13

Inventor: XIONG XIAODONG HE (CN)
Applicant: BEIJING NON FERROUS METAL INST (CN)
Classification:  - international: G01N33/531; G01N33/531;
Abstract --- The invention relates to a technology method and reacting device for making detection using nanometer colloidal gold that includes the following steps: setting material intake on reacting device, and having sealing cover, whisking device is set in the reacting device, and condensate reflux unit is set on top, heater is set on the bottom of the reactor and the four sides of bottom to form heating area to take equal heating to reaction liquid; adding auric chloride acid solution into reacting device to take heating, starting whisking device and taking cooling by using condensate reflux unit; after solution boiling, adding citric acid-3-natrium solution, after boiling for 10 minutes, stop heating; cooling and filtering to gain colloidal gold. The invention could gain the colloidal gold that has good sphericity and size distribution.


Preparation Method of Two-Dimensional Plane Gold Nano Single Crystal Plate
CN1924117
2007-03-07

Inventor: WANG LUYAN CHEN (CN)
Applicant: SHANDONG UNIVERSITY (CN)
Classification:  - international: C30B29/02; C30B29/02;
Abstract --- The invention discloses a preparing method of two-dimension plane gold micro-nanometer single-chip disc, which comprises the following steps: (1) allocating mold; blending non-ion surface activator, clad and chlorauric acid solution; obtaining even hexagonal lysotropic liquid crystal; (2) stewing the lysotropic liquid crystal; (3) collecting the product; observing the product with regular trianglar or hexagonal structure through electron microscope; measuring the length at 1-10um and thickness at 10-100nm.


Aqueous Phase Synthesis Method for Preparing Nanometer Gold Grains
CN1876290
2006-12-13

Inventor: CHEN HONGZHENG ZHAN (CN)
Applicant: UNIV ZHEJIANG (CN)
Classification:  - international: B22F9/16; B22F9/16;
Abstract --- The invention discloses a process of preparing nanometer gold grains in aqueous phase, comprising following steps: (1) alkalizing acyclic compound to acrylate compounds, preparing aqueous solution; (2) stirring and boiling chlorauric acid solution, adding it into acrylate compound solution, heating and stirring continuously for 15-25 minutes and getting nanometer gold size solution; the adding amount proportion between said acrylate compound and chlorauric acid by mole is 5-100: 1. The invention employs acrylate compound as reducer and stabilizer, the preparation is preceded in boiling aqueous phase, and the grain size of prepared nanometer grain is 10 to 100nm.


Nanometer Gold Grain Microwave Synthesis Method
CN1876292
2006-12-13

Inventor: WANG ZHENXIN LIU (CN)
Applicant: CHANGCHUN APPLIED CHEMISTRY (CN)
Classification:  - international: B22F9/24; B22F9/16;
Abstract --- The invention relates to a method for synthesizing gold nanometer grain. The invention employs microwave heating method to replace traditional reflux method, and employs sodium citrate as reducer to reduce chlorauric acid to gold nanometer grain. It provides a formula for getting grain size Y (nm) of gold nanometer grain and sodium citrate/ chlorauric acid mol ratio X : Y=8.55+101.5/(1+1.6X5); getting gold nanometer grain with required grain size by choosing the mol ratio of sodium citrate/ chlorauric acid according to provided formula. The gold nanometer grain with different size dispersion can be got by adjusting ratio between chlorauric acid and sodium citrate in initial mixture. The invention employs one reducer to synthesize gold nanometer grain with different size, and the time is ten times shorter than that of traditional method.


Water-Phase Production of Length Controllable Dendritic Golden Nanometer Particle
CN1817523
2006-08-16

Inventor: YANG WENSHENG JI (CN)
Applicant: UNIV JILIN (CN)
Classification:  - international: B22F9/24; B22F9/16;
Abstract --- A water-phase preparing process for the dendritic gold nanoparticles with controllable twig length used for biologic marker and biologic detection includes such steps as providing gold nanoparticles as seeds, regulating the pH value of tetrachloroaurcolic acid to 3.5-12, adding said seeds to the solution mixture of tetrachloroaurcolic acid and reducer while stirring, and reacting at 4-30 deg.C for 1-5 min while stirring.


Method for Preparing Gold Colloidal Nanoparticles
CN1806973
2006-07-26

Inventor: YANG SHENGCHUN ZHANG (CN)
Applicant: UNIV XI AN JIAOTONG (CN)
Classification:  - international: B22F9/24; B22F9/16;
Abstract --- The invention relates the method for preparation of nanometer gold particle, comprising the following step: making the mixture solution of PVP and citric acid, adding chlorauric acid solution, and injecting the mixture solution into quartz coiled pipe which is irradiated by ultraviolet lamp, the radiated wave length of ultraviolet lamp being 253.7-300nm, and the power of ultraviolet lamp being 14-2000W. Using the method, the grain-size distribution of nanometer gold particle is homogeneous, the particle sizes are easy to control, the least mean particle diameter is 1.5nm, and no poison material and the polluted material are produced.


Method for Preparing Gold Nano Microgranule Powder
CN1806972
2006-07-26

Inventor: LI MINGZHU LIU (CN)
Applicant: CHINESE ACAD INST CHEMISTRY (CN)
Classification:  - international: B22F9/24; B22F9/16;
Abstract --- The invention discloses the method for preparation of nanometer gold ultramicron powders, comprising the following steps: 1 mixing the polyvinyl pyrrolidon solution and chlorauric acid solution; 2 adding natrium hydroxydatum solution; 3 heating with microwave, getting the nanometer gold sol; 4 evaporating it with vacuum rotatory evaporator and getting nanometer gold ultramicron powders. The method possesses the advantages of low cost, simple technology and wide applications.


Synthesis Process of Nanometer Mesoporous Gold Complex
CN1772612
2006-05-17

Inventor: LU GAOMENG QI (CN)
Applicant: LANZHOU CHEM PHYS INST (CN)
Classification:  - international: C01B39/04; C01B39/00;
Also published as:    CN1318298C (C)
Abstract --- The present invention relates to the synthesis process of nanometer mesoporous gold complex. The synthesis process includes: dissolving chlorauric acid in solution prepared with template agent, water and hydrochloric acid via strirring at 0-60 deg.c for 0.3-1 hr; dropping ethyl silicate into the solution to obtain the sol of nanometer mesoporous gold complex and crystallizing statically at 0-160 deg.c for 24-72 hr; filtering, washing and drying to obtain nanometer Ag/SiO2 mesoporous complex cake; and roasting at 450-600 deg.c in air atmosphere for eliminating the template agent to obtain the nanometer mesoporous gold complex. The present invention has simple reaction process, simple operation, low reaction temperature, wide temperature range, etc. and the prepared nanometer metal particle has size of 2.5-20 nm.


Gold Nanometer Particle Grain Size Control Method Based on Glutathione
CN1736638
2006-02-22

Inventor: WANG YING YANG (CN)
Applicant: UNIV SHANGHAI JIAOTONG (CN)
Classification:  - international: B22F9/24; B22F9/16;
Also published as:    CN1332775C (C)
Abstract --- Disclosed is a method for controlling the grain diameter of gold nanometer particles with glutathion, belonging to the field of nanometer technology. The specific steps are as following: a. mixing the citric acid trisodium solution with glutathion solution; b. heating separately the solution prepared by step-a and chlorauric acid solution, then mixing; c. heating the solution to boiling to make the reaction complete after the solution prepared by step-b off-color, then cooling the liquid to prepare gold nanometer particle sol solution. The method is characterized in that: it is simple and the efficiency is high, the particle dimension is easy to adjust, and the creature compatibility is good, and the prepared nanometer particles has a good dispersibility and a uniform grain diameter which can be controlled by a range of 8-40nm. The gold nanometer particles can apply in the field of DNA detection, biology, drug industry, and so on.


Preparation Method of Monodisperse Gold Nanometer Particle...
CN1736637
2006-02-22

Inventor: YANG WENSHENG JI (CN)
Applicant: JILIN UNIVERSITY (CN)
Classification:  - international: B22F9/24; B22F9/16;
Abstract --- The invention discloses a method for preparation of monodispersed gold nanometer particles used for detection of immunity chromatography, belonging to the technical field of preparing nanometer materials. Using sodium citrate as the reducer and reducing gold schloride in water- phase, the technique is characterized in that: the molar ratio of sodium citrate to gold schloride is among 7.0- 20: 1; the temperature of the reaction system keeps 80- 99Deg. C; the PH value of gold schloride water solution is adjusted between 2.0- 5.0, the sodium citrate is added into the solution with stirring, and the stirring continues until the color of the sol is not changeable. The method is characterized in that the operation is simple, the repeatability is easy, and the cost is low; the grain diameter of gold nanometer particle is among 20- 40nm, and the polydispersion degree decreases to among 5- 10%, which satisfy the requirements of technique of biology mark and immunity chromatography more.


Poisonless Low Cost Refining Method for Noble Metals
CN1683573
2005-10-19

Inventor: BI SHU (CN)
Applicant: WEIXIONG MACHINERY EQUIPMENT C (CN)
Classification:  - international: C22B9/05; C22B11/00; C22B9/00; C22B11/00; (IPC1-7): C22B11/00; C22B9/05
Also published as:  CN1308470C (C)
Abstract --- The poison-less noble metal refining process includes the following steps: superfine treating ore material to nanometer level; setting nanometer level ore powder and water into high pressure reactor, heating and pressurizing to make water reach supercritical state, introducing high pressure oxygen containing gas to oxidize ore material fully; decompressing to evaporate water, and screening remainder solid to obtain required noble metal. Owing to the superfine treatment of the ore material, the coated gold and other accompanied minerals are separated physically, and serial chemical reactions are completed under nanometer size to raise the reaction rate to several times or decades times. Therefore, the present invention has greatly raised yield, greatly lowered cost, no environmental pollution, recovery of heat energy and high comprehensive utility.


Method for Preparing Nano Gold Solution
CN1663714
2005-09-07

Inventor: HUANG DEHUAN (CN); LI ZONGQUAN (CN); LU CHUNJU (CN)
Applicant: HUANG DEHUAN (CN)
Classification:  - international: B22F9/24; B22F9/16; (IPC1-7): B22F9/24
Also published as:  CN1302882C (C)
Abstract --- The invention discloses a method of nanometer aurum solution, which includes the following processes, (1) charging chlorauric acid into deionized water, then charging polyvinyl pyrrolidon, sodium dodecyl sulfate, wherein the mass concentration of the chlorauric acid, polyvinyl pyrrolidon, and sodium dodecyl sulfate being 0.01 1/2 1.0, 0.02 1/2 2.0 and 0.0001 1/2 1.0, (2) at room temperature, charging 0.01-0.5% aqueous solution of hydrazine hydrate into the miscible liquid of step (1) while agitating, when the pH reaches 6.8-7.0, ceasing the charge of hydrazine hydrate aqueous solution, continuing stirring 20-30 minutes.


Indirecting Light Chemical Preparation for Gold Nanometer Material
CN1613589
2005-05-11

Inventor: DONG SHOUAN (CN); YANG SHENGCHUN (CN)
Applicant: KUNMING NOBLE METAL INST (CN)
Classification:  - international: B22F9/24; C22B11/00; B22F9/16; C22B11/00; (IPC1-7): B22F9/24; C22B11/00
Also published as:    CN1322952C (C)
Abstract --- An indirect photochemical process for preparing gold nanoparticles includes such steps as mixing CLCH2COOH with NaAc, regulating pH=2.0-5.5, adding Fe2(SO4)3 and EDTA, adding HAuO4, ultraviolet irradiating, and traditional granulating.


Method and Apparatus for Preparing Nano-Silicon Particle by Anodic Oxidation Process
CN1603471
2005-04-06

Inventor: RAN GUANGZHAO (CN); ZHANG BORUI (CN); QIAO YONGPING (CN)
Applicant: UNIV BEIJING (CN)
Classification:  - international: C25B1/00; C25B1/00; (IPC1-7): C25B1/00
Also published as:    CN1333108C (C)
Abstract --- The invention provides an anodic oxidation process preparation nanometer silicon pellet method and the equipment, belongs to the silicon nanometer material preparation domain. The method fixes the silicon chip in the etching trough base, the silicon chip back with the metal foundation contact, the foundation meets the anode: The configuration corrosive liquid, the corrosive liquid such as to the etching trough in, connects the negative pole the platinum gold electrode or in the graphite good electrode insertion corrosive liquid; Puts through the electrode, the current density control in the 10-300mA/cm2 scope, the time is 5-30 minute; Closes the power source, takes out the silicon chip and gently flushes with the pure water, then may collect on the silicon chip surface the nanometer silicon pellet. Uses this invention to be possible remarkably to increase the silicon chip and the corrosive liquid contacted area, makes the silicon chip the corrosion rate to enhance nearly hundred times simply compared to the existing technology, the equipment, the cost low, can be fast, the volume production nanometer silicon pellet, this nanometer silicon is the performance very good semiconductor photoelectron material.


Method for Preparing Novel Load Type Nanometer Gold Catalyzer
CN1565727
2005-01-19

Inventor: AN LIDUN (CN); QI SHIXUE (CN); SUO ZHANGHUAI (CN)
Applicant: AN LIDUN (CN)
Classification:  - international: B01J23/52; B01J37/02; B01J23/48; B01J37/00; (IPC1-7): B01J23/52; B01J37/02
Abstract --- The invention provides a method for preparing a supported nano-gold catalyst, specially a supported nano-gold catalyst with high gold-load rate, high dispersion degree and high catalytic activity. The process includes the following steps: adjusting pH value of HAuCl#-[4] water solution to 7-9 by using alkali; according to saturated water absorbing capacity of carrier, soaking by equal volume; immersing the soaked carrier and adsorbed active component in aqueous alkali, and carrying out the exchange reaction of Cl#+[-] ion. The supported nano-gold catalyst has excellent catalytic activity.


NANO-SILVER
 
 

METHOD FOR PRODUCING METAL NANOPARTICLES
WO2008003522
2008-01-10

Inventor: DE WINDT WIM (BE); VERCAUTEREN TOM (BE); VERSTRAETE WILLY (BE)
Applicant: UNIV GENT (BE); AVECOM N V (BE); DE WINDT WIM (BE); VERCAUTEREN TOM (BE); VERSTRAETE WILLY (BE)
Classification:  - international: C12P3/00; C12P3/00; - European: C12P3/00; Y01N6/00
Abstract --- This invention provides a method for producing a composition comprising colloidal nanoparticles of metals including silver, gold, zinc, mercury, copper, palladium, platinum, or bismuth, by contacting a metal or metal compound with bacteria. An embodiment of the method comprises a step of incubating probiotic bacteria with an aqueous solution comprising at least 4 mM of a silver or gold salt. A resulting nanosilver-containing composition is useful as a highly efficient antimicrobial agent, for instance when impregnated onto a carrier, or an algicide agent or a herbicide agent.


MASS PRODUCTION METHOD OF NANO SILVER...
WO2006135128
2006-12-21

Inventor: HWANG KI YANG (KR)
Applicant: HWANG KI YANG (KR)
Classification:  - international: D06M11/42; D06M11/00; - European: D06M11/83; C25C1/20; C25C5/02; D06M10/04; D06M11/42
Also published as:  US2006278534 (A1)
Abstract --- Disclosed herein are a method of mass-producing nanosilver, a method of manufacturing nanosilver-coated antibacterial fiber, and antibacterial fiber manufactured thereby. Nanosilver having a size of 5 nm or less can be produced on a mass scale by applying an electric field of 10,000 to 300,000 volts (DC) across two Ag electrode plates equipped in a water electrolysis system and allowing only a microcurrent to flow between the electrode plates. The nanosilver-coated, antibacterial fiber is manufactured by applying a aqeous solution of the nanosilver to the surface of the synthetic fibers, adsorbing the nanosilver onto the cloth using a process selected from the group consisting of thermal fixation, high frequency radiation, bubbling, and combinations thereof; and conducting a post-finishing at 160 to 200 DEG C. And thus, an antibacterial fiber manufactured thereby may be a fundamental solution to the synthetic fiber's problems, that is, poor perspiration functionality and the generation of statistic electricity.


Colloidal Nanosilver Solution and Method for Making the Same
TW250969B
2006-03-11

Inventor: YAN JIXIONG (CN); CHENG JIACHONG (CN)
Applicant: C C TECHNOLOGY INVEST CO LTD (VG)
Classification:  - international: C01G5/00; A01N59/16; A61K33/38; B01J13/00; C01G5/00; A01N59/16; A61K33/38; B01J13/00; (IPC1-7): C01G5/00;  - European: A01N59/16; A61K33/38; B01J13/00B12
Also published as:  WO03080231 (A1-corr) //  WO03080231 (A1) //    US2003185889 (A1)  //  AU2003225460 (A1)
Abstract --- The present invention provides a nanosilver composition which contains nanosilver particles having diameters between 1 nm and 100 nm. The silver content in the nanosilver composition is between 0.001% to 0.4% by weight. The nanosilver composition also contains a stabilizing agent which includes, but is not limited to, starch or its derivative, cellulose or its derivative, polymer or copolymer of acrylate or acrylate derivative, polyvinyl pyrrolidone, alginic acid, and xantham gum. The present invention also provides a method for making the nanosilver composition. The nanosilver composition prepared by this method does not contain any toxic substances.


STABILIZED SILVER NANOPARTICLE COMPOSITION
US2008000382
2008-01-03

Inventor: LI YUNING (CA); WU YILIANG (CA); ONG BENG S (SG)
Applicant: XEROX CORP (US)
Classification:  - international: C09D5/24; C09D5/24; - European: B22F1/00A2B4; B22F1/00A4C; B22F9/24; H01B1/22; H01L51/00A8; H01L51/10B2; Y01N6/00
Also published as:    EP1646095 (A2) //   US7270694 (B2) //   US2007099357 (A1)  //  US2006073667 (A1)//  JP2006104576 (A)
Abstract --- 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.


Silver Powder and Method of Preparing the Same
TW272983B
2007-02-11

Inventor: SATO KIMITAKA (JP)
Applicant: DOWA MINING CO (JP)
Classification:  - international: B22F1/02; B01F17/00; B22F9/24; B22F1/02; B01F17/00; B22F9/16; - European: B22F9/24; B22F1/00A2B4; B22F1/00A4C; Y01N6/00
Also published as:  EP1844884 (A1) //  WO2006082987 (A1) //  KR20070099631 (A) //  JP2006213955 (A)
Abstract --- To obtain a silver nanoparticle powder suitable for a wiring material for forming a fine circuit pattern, particularly for a wiring formation material through inkjet method. The silver nanopowder has an average particle size (DTEM) below 30 nm, aspect ratio below 1.5, crystal particle diameter (Dx) by X ray under 30 nm, single crystalline degree [(DTEM)]/(Dx) under 5.0, and CV value [=100 x standard deviation (sigma)/number average particle size [(DTEM)] under 40%, measured by TEM observation, the surface of the powder being covered with an organic protective agent with molecular weight 100 to 400. The nanopowder is obtained by reducing silver salt at temperature of 85 to 150 DEG C in the co-existence of the organic protective agent within the alcohol of boiling point 85 to 150 DEG C.


Chemical Preparation Method of Ag Nanoparticle
CN1994633
2007-07-11

Inventor: CHEN YANMING LI (CN)
Applicant: SHENYANG UNIVERSITY OF TECHNOL (CN)
Classification:  - international: B22F9/24; B22F9/16;
Abstract --- The invention relates to a method for preparing silver nanometer particles, wherein it is characterized in that: it uses silver nitrate or silver perchlorate as initial reactant; uses sodium oleate or linolic acid sodium as surface activator; mixing them at free ratio; uses toluene, dimethylbenzene, and sub dichlorobenzene or chloroform reaction medium; in organic phase, obtaining silver nanometer particles. The invention has simple control, without preparing forward element and organic solvent with high boiling point, with low cost. The inventive silver nanometer particles can be dispersed in non-polar medium and polar medium.


Method for Preparing Silver Nanoparticle with Multiple Colored Liquid Phase
CN1994632
2007-07-11

Inventor: JIANG ZHILIANG CHEN (CN)
Applicant: GUANGXI NORMAL UNIVERSITY (CN)
Classification:  - international: B22F9/24; B22F9/16;
Abstract --- The invention relates to a method for preparing several colors of liquid silver nanometer particles, wherein said method comprises that: putting AgNO3 under alkali microwave radiation high-pressure reaction, using alcohol as reducer, with sodium dodecylbenzene sulfonate (anion surface activator), processing preparation; changing the solution density, to obtain different liquid silver nanometer particles. The invention has the advantages that: (1), the invention has simple process, only needs family microwave furnace; (2), the material can be obtained easily; (3), it can change solution density to prepare different color liquid silver nanometer particles; (4), the silver nanometer particles have uniform diameters and better stability.


Method for Preparing Redispersible Ag Nanoparticle...
CN1994631
2007-07-11

Inventor: LIU CHUNYAN ZHANG (CN)
Applicant: TECHNICAL INST OF PHYSICS AND (CN)
Classification:  - international: B22F9/24; B22F9/16;
Abstract --- The invention relates to a method for using silver halide pre-crystallization reduction to prepare silver nanometer particles which can be dispersed again, wherein said method uses silver halide pre-crystallization reduction method to obtain uniform silver nanometer particles. The invention uses water as disperse medium; in the system with polymer surface activator, using organic solvent to reduce prepared silver halide pre-crystallized silver nanometer particles gel; then separating silver nanometer particles which can be dispersed into solvent to form gel again.


Reactive, Monodispersed Surface Modified Silver Nanoparticle
CN1966586
2007-05-23

Inventor: ZHANG SHENGMAO HE (CN)
Applicant: HENAN UNIVERSITY (CN)
Classification:  - international: C09C1/62; C09C1/62;
Abstract --- The invention disclosed a reactable mono dispersal surface silver nanometer bead as well as the preparing method, which belongs to the nanometer material and it's preparing technology domain. The product in the invention has a general formula of (I), of which X1 refers to halogen, X2 refers to unsaturated hydrocarbon, n=4-22, m=4-22. The preparing procedure includes the following steps: dissolving the dialkyl dithio-phosphoric acid with the general formula of (II) in the organic solvent; adding the previous solution into the sodium borohydride solution at 0-5DEG C; adding soluble silver salt solution; extracting with organic solution after reaction; vacuum distillating to get the product. The product in the invention can be dispersed stably in non-pole or low-pole solvents, it can be dispersed in the polar solvent in the form of similar dissolving which has enlarged the utilizing scope of nanometer bead. The preparing procedure has the advantage of simple operation, low cost and high yield, it is applicable to large-scale production.


SILVER NANOPARTICLE AND PRODUCTION METHOD THEREFOR
JP2007063580
2007-03-15

Inventor: NAKAMOTO MASAMI; YAMAMOTO MARI; KASHIWAGI YUKIYASU; YOSHIDA YUKIO; KAKIUCHI HIROYUKI; HARADA MASAHIRO
Applicant: OSAKA CITY; DAIKEN KAGAKU KOGYO KK
Classification:  - international: B22F9/24; C09D1/00; C09D5/24; C09D11/00; B22F9/16; C09D1/00; C09D5/24; C09D11/00;
Abstract --- PROBLEM TO BE SOLVED: To provide silver nanoparticles having more excellent dispersibility and superior dispersibility in water and/or a water-soluble organic solvent.
SOLUTION: A method for producing the silver nanoparticles includes the step of heat-treating a starting material containing (1) an amine compound, (2) a silver salt and (3) a polycyclic hydrocarbon compound having a carboxyl group.


PRODUCTION METHOD OF SILVER NANOPARTICLE, SILVER NANOPARTICLE AND APPLICATION THEREOF
JP2006328472
2006-12-07

Inventor: FUJIEDA NOBUHIKO; NISHIHARA KUNIO
Applicant: MITSUI CHEMICALS INC
Classification:  - international: B22F9/24; B22F1/00; H05K1/09; H01B1/22; B22F9/16; B22F1/00; H05K1/09; H01B1/22
Abstract --- PROBLEM TO BE SOLVED: To provide a method of producing silver nanoparticles (average grain size 1 to 20 mm) for a silver paste having a good specific resistance of a hardening film at a high yield by a chemical reduction process.
SOLUTION: More than stoichiometerically excessive ammonia water is added to an aqueous silver nitrate solution to form a silver complex and the silver nanoparticles are produced by reduction with an aqueous formalin solution at >=0.90 in the ratio of the solvent and water at temperature 20 to 40[deg.]C in a methyl ethyl ketone solvent containing >=2% polymer dispersant.


METHODS OF CONTROLLING NANOPARTICLE GROWTH.
MXPA05010661
2006-04-18

Inventor: MIRKIN CHAD A (US)
Applicant: UNIV NORTHWESTERN (US)
Classification:  - international: B22F1/00; B22F9/24; B22F1/00; B22F9/16; (IPC1-7): 82B00/00A; 22F03/00B; B82B0/00; C22F3/00; - European: B22F1/00A2B2; B22F1/00A2B4; B22F9/24; Y01N6/00
Also published as:  WO2004089813 (A3) // WO2004089813 (A2)  // EP1613787 (A3) //    EP1613787 (A2) // KR20060080865 (A)
Abstract --- The invention provides new types of plasmon-driven growth mechanism for silver nanostructures involving the fusion of triangular nanoprisms. This mechanism, which is plasmon excitation-driven and highly cooperative, produces bimodal particle size distributions. In these methods, the growth process can be selectively switched between bimodal and unimodal distributions using dual beam illumination of the nanoparticles. This type of cooperative photo-control over nanostructure growth enables synthesis of monodisperse nanoprisms with a preselected edge length in the 30-120 nm range simply by using one beam to turn off bimodal growth and the other (varied over the 450-700 nm range) for controlling particle size.


Ag NANOPARTICLE, METHOD FOR PRODUCING THE SAME AND DISPERSED SOLUTION OF Ag NANOPARTICLE
JP2006118010
2006-05-11

Inventor: KAKIHARA YASUO; MITANI YOSHIFUMI
Applicant: TODA KOGYO CORP
Classification:  - international: B22F9/24; B01F17/00; B01J13/00; B22F1/00; B22F9/16; B01F17/00; B01J13/00; B22F1/00;
Abstract --- PROBLEM TO BE SOLVED: To provide Ag nanoparticles easily redispersed even if a dispersed solution of Ag nanoparticles is dried and hardened or is made into a state close thereto by a method of concentration or the like, and from which a dispersing agent can be removed by a simple operation, and to obtain a dispersed solution comprising the Ag nanoparticles.
SOLUTION: The Ag nanoparticles with a particle diameter of 1 to 20 nm comprising the ammine complex of silver nitrate as a dispersing agent can be obtained by mixing silver nitrate, a reducing agent which does not show reducibility in an organic solvent and alkylamine in an organic solvent.


SILVER NANOPARTICLE AND PRODUCTION METHOD THEREFOR
JP2006045655
2006-02-16

Inventor: UNO TAKAHIRO; SATO KAZUSUKE
Applicant: MITSUBISHI MATERIALS CORP
Classification:  - international: B22F9/24; B22F1/00; B22F9/16; B22F1/00;
Abstract --- PROBLEM TO BE SOLVED: To provide a silver nanoparticle which is used for a raw material of a conductive paste for electronics industry or the like, and is superior in dispersibility, and to provide a production method therefor.
SOLUTION: In a process for obtaining the silver particle by reducing a silver nitrate solution with ferrous sulfate under the presence of sodium citrate, and collecting the formed silver nanoparticle, the method for producing the silver nanoparticle includes charging the silver nitrate solution in a short while of 10 seconds or shorter, when charging the silver nitrate solution into the mixed solution of ferrous sulfate and citric acid soda. The silver nanoparticles produced with the method are spherical particles having uniform diameters of 20 nm or smaller by average.


Methods of Controlling Nanoparticle Growth
US2005188789
2005-09-01

Inventor: MIRKIN CHAD A (US); METRAUX GABRIELLA S (US); JIN RONGCHAO (US); CAO YUNWEI C (US)
Classification:  - international: B22F1/00; B22F9/24; B22F1/00; B22F9/16; (IPC1-7): B22F1/00;  - European: B22F1/00A2B4D; B22F1/00A2B2; B22F1/00A2B4; B22F9/24; Y01N6/00
Also published as:  US7033415 (B2)
Abstract --- The invention provides new types of plasmon-driven growth mechanism for silver nanostructures involving the fusion of triangular nanoprisms. This mechanism, which is plasmon excitation-driven and highly cooperative, produces bimodal particle size distributions. In these methods, the growth process can be selectively switched between bimodal and unimodal distributions using dual beam illumination of the nanoparticles. This type of cooperative photo-control over nanostructure growth enables synthesis of monodisperse nanoprisms with a preselected edge length in the 30-120 nm range simply by using one beam to turn off bimodal growth and the other (varied over the 450-700 nm range) for controlling particle size.


PLASMA SYNTHESIS OF METAL OXIDE NANOPARTICLE
JP2005132716
2005-05-26

Inventor: ZHANG LU
Applicant: DU PONT
Classification: - international: A61K8/19; A61K8/26; A61K8/29; B01J19/08; B01J19/26; B01J21/08; B01J35/02; C01B13/28; C01B33/18; C01B35/10; C01G23/00; C01G23/07; A61K8/19; B01J19/08; B01J19/26; B01J21/00; B01J35/00; C01B13/20; C01B33/00; C01B35/00; C01G23/00; (IPC1-7): C01B13/28; A61K7/00; B01J19/08; B01J21/08; B01J35/02; C01B33/18; C01B35/10; C01G23/07; - European: C01G23/07; B01J19/08D2; B01J19/26; C01G23/00D; Y01N6/00
Also published as:  EP1514846 (A1) // KR20050027058 (A) // CN1607181 (A) //   CA2481150 (A1)
Abstract --- PROBLEM TO BE SOLVED: To provide a method for manufacturing particles containing metal oxides, nanoparticles in particular, which are specifically nano-size particles containing titanium dioxide.
SOLUTION: The process for synthesizing nano-size metal oxide particles in a plasma reactor comprises a process (a) where one or a plurality of reactant flows containing an oxidizing agent and a halogenated metal, a halogenated silicon, and a coarse tail controlling agent selected from a group comprising halogenated compounds of phosphorus, germanium, boron, tin, niobium, chromium, silver, gold, palladium, aluminum, and their mixtures are supplied simultaneously and a process (b) where the reactant flows and the oxidizing agent are brought into contact with plasma having a sufficient temperature to form metal oxide-containing nanoparticles having an average particle diameter of <100 nm and containing a small amount of particles having a diameter of >200 nm.


Silver Comprising Nanoparticles and Related Nanotechnology
US2005008861
2005-01-13

Inventor: YADAV TAPESH (US); VECOVEN AUDREY (FR)
Applicant: NANOPRODUCTS CORP (US)
Classification:  - international: C08K3/08; C08K3/00; (IPC1-7): B32B5/16; B32B27/18; C08K9/00;  - European: C08K3/08
Abstract --- Nanoparticles comprising silver and their nanotechnology-enabled applications are disclosed; doped metal oxides, silver comprising complex nanoparticle compositions, silver nanoparticles, methods of manufacture, and methods of preparation of products from silver comprising nanoparticles are presented; And anti-microbial formulations are discussed. Color photochromaticity and related applications are disclosed.


Synthesis Metal Nanoparticle
US6929675
2005-08-16

Inventor: BUNGE SCOTT D (US); BOYLE TIMOTHY J (US)
Applicant: SANDIA CORP (US)
Classification:  - international: B01J13/00; B22F1/00; B22F9/24; B01J13/00; B22F1/00; B22F9/16; (IPC1-7): B22F9/24; - European: B01J13/00; B22F1/00A2B4; B22F9/24; Y01N6/00
Abstract --- A method for providing an anhydrous route for the synthesis of amine capped coinage-metal (copper, silver, and gold) nanoparticles (NPs) using the coinage-metal mesityl (mesityl=C<SUB>6</SUB>H<SUB>2</SUB>(CH<SUB>3</SUB>)<SUB>3</SUB>-2,4,6) derivatives. In this method, a solution of (Cu(C<SUB>6</SUB>H<SUB>2</SUB>(CH<SUB>3</SUB>)<SUB>3</SUB>)<SUB>5</SUB>, (Ag(C<SUB>6</SUB>H<SUB>2</SUB>(CH<SUB>3</SUB>)<SUB>3</SUB>)<SUB>4</SUB>, or (Au(C<SUB>6</SUB>H<SUB>2</SUB>(CH<SUB>3</SUB>)<SUB>3</SUB>)<SUB>5 </SUB>is dissolved in a coordinating solvent, such as a primary, secondary, or tertiary amine; primary, secondary, or tertiary phosphine, or alkyl thiol, to produce a mesityl precursor solution. This solution is subsequently injected into an organic solvent that is heated to a temperature greater than approximately 100 DEG C. After washing with an organic solvent, such as an alcohol (including methanol, ethanol, propanol, and higher molecular-weight alcohols), oxide free coinage NP are prepared that could be extracted with a solvent, such as an aromatic solvent (including, for example, toluene, benzene, and pyridine) or an alkane (including, for example, pentane, hexane, and heptane). Characterization by UV-Vis spectroscopy and transmission electron microscopy showed that the NPs were approximately 9.2+-2.3 nm in size for Cu DEG , (no surface oxide present), approximately 8.5+-1.1 nm Ag DEG spheres, and approximately 8-80 nm for Au DEG .


Nanoprisms and Method of Making Them
US2003136223
2003-07-24

Inventor: JIN RONGCHAO (US); CAO YUNWEI (US); MIRKIN CHAD A (US)
Classification:  - international: B22F1/00; B22F9/24; C22C5/06; B22F1/00; B22F9/16; C22C5/06; (IPC1-7): C22C1/04; C22C5/06; - European: B22F1/00A2B4; B22F9/24; C22C5/06; Y01N6/00
Also published as:    US7135054 (B2)
Abstract --- The invention is a novel photo-induced method for converting large quantities of silver nanospheres into nanoprisms, the nanoprisms formed by this method and applications in which the nanoprisms are useful. Significantly, this light driven process results in a colloid with a unique set of optical properties that directly relate to the nanoprism shape of the particles. Theoretical calculations coupled with experimental observations allow for the assignment of the nanoprism plasmon bands and the first identification of two distinct quadrupole plasmon resonances for a nanoparticle. Finally, unlike the spherical particles from which they derive and which Rayleigh light scatter in the blue, these nanoprisms exhibit scattering in the red, permitting multicolor diagnostic labels based not only on nanoparticle composition and size but also on shape.


METHOD FOR MANUFACTURING SILVER NANOPARTICLE
JP2003253311
2003-09-10

Inventor: YONEZAWA TORU
Applicant: JAPAN SCIENCE & TECH CORP
Classification:  - international: B22F9/24; B22F9/16; (IPC1-7): B22F9/24
Abstract --- PROBLEM TO BE SOLVED: To provide a new technology which can manufacture silver nanoparticles even from an insoluble silver salt.
SOLUTION: This manufacturing method comprises, when manufacturing the silver nanoparticles by reducing a silver salt in a solvent, employing an insoluble salt of a silver halide (particularly silver chloride or silver bromide) for the silver salt, dissolving it in a solvent, and reducing it in the presence of a protective agent consisting of a compound soluble in a solvent and having a ligating property to silver. A preferable protective agent is a thiol like thiocholine bromide. Then, a monodisperse liquid of the silver nanoparticles is obtained, which are dispersed in the solvent while being coated and protected by the protective, agent.







Your Support Maintains this Service --

BUY


The Rex Research Civilization Kit

... It's Your Best Bet & Investment in Sustainable Humanity on Earth ...
Ensure & Enhance Your Survival & Genome Transmission ...

Everything @ rexresearch.com on a Data DVD !

ORDER PAGE