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Alchemy Index
Nanoparticle Gold / Silver Preparation
Patents
Method of Producing Gold Nanoparticle
US2004261574
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 0.01í 1/2 1.0ú, 0.02í 1/2 2.0ú and
0.0001í 1/2 1.0ú, (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.