913 results about "Gold particles" patented technology

A microactuator element as an example of an electrical component is disposed on a metallic, electrically conductive plate member. A conductive resin member is disposed on a current-carrying part of the conductive plate member and a conduction part of the microactuator element. A thin porous plating layer of thickness 100 nm or less includes a large number of gold particles is formed in a region of a surface of the conductive plate member which covers the current-carrying part. The conductive resin member is secured to the conductive plate member through the thin porous gold plating layer and electrically connected to the conductive plate member.

A conductive paste for grid electrodes in solar cells includes a conductive component, glass frit, and resin binder, wherein the conductive component is selected from the group consisting of (i) silver particles and metal particles selected from the group consisting of Pd, Ir, Pt, Ru, Ti, and Co, (ii) alloy particles comprising silver and metal selected from the group consisting of Pd, Ir, Pt, Ru, Ti, and Co, and (iii) silver particles and core-shell particles in which a metal selected from the group consisting of Pd, Ir, Pt, Ru, Ti, and Co is coated on the surface of silver or copper.

The invention discloses a carrier nanometer gold catalyst gold catalyst and relative preparing method. Said invention is formed by Au, Al, and Ti/Si, Ag, Cu, Ce, Fe, or Zn. Wherein, Au is the main active component of catalyst, whose mass percentage is 0.1-4.0%; Al is the carrier of catalyst, whose mass percentage is larger than 90%; Ti or Si is the agent of catalyst carrier, whose mass percentage is 0.01-1.0%; Ag, Cu, Ce, Fe, or Zn is used as the auxiliary active component of catalyst, whose mass percentage is 0.1-5.0%. The invention has the advantages that: the gold is distributed uniformly, and the graininess of attained gold particle can be adjusted easily; the catalyst has high stability; and it can apply the oxide carrier for carrying gold whose isoelectric point pH is less than 6 and made by coprecipitation method. The invention has be used to apply the cyclohexane to prepare the nadone and cyclohexanol, with better activity and selectivity, less used amount and recycle support.

The preparation process of nano gold particle material includes the following steps: preparing mixed water solution of HAuCl4, protecting agent and acetone in the weight ratio of 1 to 10-10000 to 100-1500, with the protecting agent being one of polyglycol, PVA and PVP; and irradiating the mixed water solution with ultraviolet ray of wavelength 254-400 nm to complete the reduction reaction to obtain nano gold particle. The said technological process is simple, and can produce pure nano gold particle with controllable size and narrow size distribution range. The produced nano gold particle may be used in biomedicine, electronic industry and fine chemical industry.

The invention provides a sensor for nano gold particles and a preparation method thereof. The end surface of a multi-core optical fiber is of a conical-platform structure; a total-reflection film is plated on the surface of the conical platform; the nano gold particles which are distributed regularly are fixed on the end surface of the optical fiber plated with the total-reflection film; exciting light is injected into one fiber core of the multi-core optical fiber, is reflected to the end surface of the optical fiber at the film-plated position of the conical platform and generates total internal reflection on the end surface of the optical fiber, and a generated evanescent field excites a localized surface plasmon resonance effect of the nano gold particles; the reflected light is collected by the fiber core symmetrical to the fiber core injected with the exciting light, and the change of the physical quantity of external substances is sensed by the spectrum of the reflecting light. The sensor and the preparation method have the advantages that the multi-core optical fiber, a self-assembly technology of a near-field optical tweezer and the localized surface plasmon resonance effect of the nano gold particles are combined, and the near-field optical tweezer of the multi-core optical fiber can be utilized for capturing the nano gold particles, so that the optical self-assembly and regular distribution is carried out on the nano gold particles according to the distribution rule of the capturing areas; the structure is simple, the volume is smaller and the repeatability is high.

A method for depositing a hydrophilic and electrically conductive layer onto a bipolar plate substrate for a fuel cell in a one step process. The method includes mixing a solution of a conductive material, such as gold particles, and a hydrophilic material, such as silicon dioxide particles, in a suitable solvent, such as ethanol. The solution is then deposited on the bipolar plate substrate by any suitable low cost process. Once the solution dries and the ethanol has evaporated, a thin layer of the conductive and hydrophilic particles remains on the substrate. In one embodiment, the conductive particles are significantly larger than the hydrophilic particles to provide both the desirable hydrophilicity and the low contact resistance.

The present invention relates to an aqueous colloidal gold solution, comprising (a) nano-particular gold particles, (b) a compound having a polar tertiary amino group conjugated via a hydrophobic aromatic residue with a weaker alkaline group, and

• • (c) a stabilizer comprising a mercapto group (—SH) and an acidic group, in particular a sulfonic acid group (—SO₃⁻). This gold solution uses an ecologically compatible medium and is suited in an especial manner for writing and for printing, also for inkjet printers, since it has a long-term storage life and generates an attractive metal-like gold sheen.

The invention belongs to the technical field of trace amount detection, in particular relates to a method that surfaces functionalized nanogold particles are used for potential fingerprint appearance. The invention provides the method that the different surface functionalized nanogold particles (probe) are used for the potential fingerprint appearance. The particles are the hydrophobixated nanogold particles decorated by alkyl hydrosulfide, the hydrophobixated nanogold particles protected by surface active agent cetane trimethyl ammonium bromide (CTAB), the water-soluble nanogold particles protected by the CTAB and the water-soluble nanogold particles protected by L-cysteine respectively. The probe and the ingredients in the residual sweat in the potential fingerprint generate the absorption and static functions or the condensation reaction, then an argentation is utilized to lead potential fingerprint samples to colorate in the argentation liquid, the nanogold particle signals for the ingredient identification in the fingerprint are magnified and the reduced argentum particles deposite at the grain position of the fingerprint samples to further present black, thereby forming the clear fingerprint image that can be observed by naked eyes. The method is simple, fast and high in sensitivity and has no harmful side effects.

The invention discloses a low-carrying-capacity high-activity supported gold catalyst using hydrotalcite as a carrier and a preparation method thereof, which belong to the technical field of catalyst preparation. The preparation method of the supported gold catalyst comprises the following steps of: selecting a hydrotalcite precursor with a higher isoelectric point as the carrier; and using a uniform hydroxyl lattice of the hydrotalcite and different crystal face orientations of the hydrotalcite to ensure that gold atoms with catalytic activity are highly dispersed and are closely anchored on a high-energy crystal face of the hydrotalcite so as to expose more active gold particles. If the catalyst is used for synthesizing phenyl ethylene oxide through catalytic oxidation of styrene, the conversion rate of reactants is high, and the selectivity of products is high.

The invention discloses a preparation method and an application of a load type nano-gold catalyst. The preparation method comprises the following steps of: (1) adding 2.0g of halloysite nanotube carrier, 2.05 to 6.15mL of chlorogold acid solution with a concentration of 10g/L and 40 to 120mL of deionized water to a 250mL flask with three necks; (2) putting the flask into an oil bath with the temperature of 60 DEG C; adjusting the pH of the solution to 8 to 12 by using 4.0M ammonia water; then carrying out stirring reflux at 95 DEG C-105 DEG C for 1 hour; filtering; rinsing for 5 minutes by using 10 to 20mL of 4.0M ammonia water; washing twice with 15 to 20mL of hot water; drying for 1 to 2 hours at 100 DEG C; and finally roasting for 3 to 4 hours in air at 300 DEG C to obtain the load type nano-gold catalyst. The invention has the advantages of simple and convenient preparation method, uniformly dispersed gold particles and high loading efficiency. The catalyst provided by the invention can be used for cyclohexene oxidation of cyclonene and cyclohexenol, with the advantages of mild reaction condition, good activity and selectivity and less catalyst utilization quantity.

A multi-layer emission control catalyst exhibits improved CO and HC reduction performance. The bottom layer includes a supported catalyst comprising platinum and palladium particles or palladium and gold particles. The middle layer includes zeolites. The top layer includes a supported catalyst comprising platinum and palladium particles. The use of zeolite mixture in the middle layer further improves CO and HC reduction performance in comparison with using zeolite of a single type. The use of a supported catalyst comprising palladium and gold particles in the bottom layer further improves CO and HC reduction performance in comparison with using a supported catalyst comprising platinum and palladium particles.

The invention discloses a nano-gold signal probe for DNA detection and the preparation method thereof, as well as a DNA detection method; the nano-gold signal probe is that the surface thereof is simultaneously assembled with proteins which can generate chromogenic or fluorescence signals and a sulfhydryl-modified signal probe DNA nano-gold-particle solution. A solid phase carrier is utilized in the DNA detection, and a sandwich complex of the solid phase carrier-target DNA-nano-gold signal probe is formed by DNA hybridization. As the surface of one nano-gold particle can be connected with a plurality of proteins which can generate chromogenic or fluorescence signals, one protein which can generate chromogenic or fluorescence signals, especially an enzyme catalyst, can catalyze a plurality of substrates to have chemical reactions, so as to amplify reaction signals, and further to significantly improve detection sensitivity. Therefore, the nano-gold signal probe, the preparation method and the DNA detection method have important significances in the biological detection, the early diagnosis and the treatment of diseases.

The invention discloses a supported gold catalyst, a preparation method and an application thereof, and a p-aminophenol preparation method. The supported gold catalyst contains silica and nano-gold particles supported on the silica, the particle size of the supported gold catalyst is not greater than 0.6mm, the average aperture is 10-70nm, and the particle size of the nano-gold particles is 1-5nm. The supported gold catalyst has the advantages of simple preparation method, low cost, good catalysis performance, good repeatability, and good dispersion and small dimensions of the supported nano-gold particles.

The invention provides a nano-gold catalyst supported on combined metal oxide, a preparation method and an application thereof. The preparation method comprises the following steps: preparing layered double hydroxides (LDH) precursor crystal nucleus and dispersing the LDH precursor crystal nucleus into sucrose solution; then adding chloroauric acid solution in the obtained mixture so as to reduce Au3+ in HAuCl4 to Au single substances by using the reduction of glucose and fructose produced by sucrose hydrolysis; in the process of reduction, crystallizing the LDHs so as to obtain solid LDH supported on nano-gold; and carrying out high-temperature roasting on the solid LDH supported on the nano-gold so as to obtain the nano-gold catalyst supported on the combined metal oxide. The combined oxide of the catalyst is taken as a carrier on which the nanosize gold particles is supported, wherein the combined oxide refers to MgO or compound of ZnO and Al2O3, and the mole ratio of the MgO to the compound of ZnO and Al2O3 is 2-6:1; the gold capacity is 0.5 to 3 percent, the size of the gold particle is 8 to 15nm, and the gold particle is ellipsoidal or polyhedral. When the catalyst is used in the catalytic hydrogenation reaction of unsaturated aldehydes, the conversion rate of reactants reaches 60 to 97 percent, and the selectivity of cinnamyl alcohol is 40 to 75 percent.

The invention relates to a preparation method of pegylation modified hyperbranched poly(ethylene imine) (PEI) coated nano-gold particles, which comprises the following steps: modifying PEI by using mPEG (polyethylene glycol)-COOH, and sequentially carrying out dialysis and freeze-drying on the obtained product so as to obtain PEI-mPEG; taking the solid, dissolving the solid by using water, adding a HAuCl4 solution into the dissolved solid, stirring the obtained product, adding a NaBH4 solution into the obtained product, and carrying out reaction on the obtained mixture at room temperature; and adding triethylamine and acetic anhydride into the obtained object, and after the reaction is completed, carrying out dialysis and freezing on the obtained product so as to obtain pegylation modified hyperbranched polymine coated nano-gold particles. According to the invention, the cheap and easily-obtained PEI is taken as a carrier, so that the cost of materials is reduced; the surface of PEI is modified by using mPEG-COOH, so that the biocompatibility of materials and the colloidal stability of nano-gold particles are improved, and the nano-gold particles are successfully applied to vivo CT (computed tomography) imaging. The method disclosed by the invention is simple in design, mild in reaction conditions and easy to operate, and has an industrialized implementation prospect.

The invention discloses a composite membrane modified biosensor and preparation and application thereof. The biosensor comprises a matrix electrode, the induction end of the matrix electrode is wrapped with an aromatic diamine polymer membrane, a carbon nano tube-Congo red combination layer is modified on the membrane, and a nano gold particle layer is adsorbed on the combination layer. The preparation method comprises the following steps of: forming the polymer membrane at the induction end of the matrix electrode by electric polymerization reaction; and modifying the carbon nano tube-Congo red combination layer on the membrane, and finally electrically depositing nano gold on the combination layer. The biosensor can be applied in detecting target genes; and during detecting, a probe is first designed, then a capture probe is modified, and whether the target genes are contained in hybridization solution to be detected and the concentration of the target genes can be judged by first and second hybridization and enzyme catalytic reaction. The biosensor has the advantages of good electric conductivity, good biocompatibility, high sensitivity, storing anti-interference performance, good selectivity, low manufacturing cost and the like.

The invention relates to a nano probe based method for detecting trace proteins by using a microfluidic chip, which is characterized by comprising the steps: manufacturing a microstructure by using a standard photoetching process, and sealing a glass sheet (spotted with a DNA (deoxyribonucleic acid) probe) and the microstructure to prepare a required microfluidic chip; simultaneously labeling a monoclonal secondary antibody and a Barcode DNA with a signal amplification function on a nano gold particle, and labeling a monoclonal primary antibody on a magnetic bead; and detecting the trace target proteins in a microfluidic chip channel by means of immunoreaction of antigens and antibodies as well as gradual amplification and silver staining development of signals. The nano probe based method provided by the invention integrates the procedures of enrichment, separation and detection of biological samples, has the characteristics of specificity, rapidness and high sensitivity, and is expected to be applied to the diagnosis and detection of trace proteins (the antigens or antibodies) in clinical laboratory medicine. The sensitivity can reach a pg/ml level and is improved by 1000 times compared with the common ELISA (enzyme-linked immunosorbent assay) method in clinical application.

The invention provides a method for preparing an activated carbon-carried nano-gold catalyst, comprising the following steps of preparing a dipping solution, adding at least one organic acid protective agent in the dipping solution, wherein the pKa value of the organic acid protective agent is close to the isoelectric point of the activated carbon/activated carbon fiber carrier, adjusting the pH value of the dipping solution to be close to the isoelectric point of the activated carbon/activated carbon fiber carrier; quickly and evenly putting the activated carbon/activated carbon fiber carrier in the dipping solution, mechanically stirring or ultrasonically mixing, standing, filtering, and then rinsing and drying the filtered carrier; roasting and reducing the dried gold-carried carrier to obtain an activated carbon/activated carbon fiber-carried nano-gold catalyst. The invention makes gold particles carried on the activated carbon have small size and be distributed evenly and improves the utilization rate of gold; and the low-concentration ozone and volatile organic compound in the air can be effectively dissolved by the catalyst.

The invention discloses a supported nano gold catalyst for cyclohexane oxidation and a preparation method thereof. The supported nano gold catalyst is composed of Au, Al, Co, Zr and Ce, wherein Au is used as a main active ingredient of the catalyst with the weight percentage content being 1.0 percent; Al is used as a carrier of the catalyst with the weight percentage content being more than or equal to 90 percent; and Co, Zr and Ce are used as supporting active ingredients of the catalyst with the weight percentage content being 1-7 percent. The preparation method comprises the following steps: modifying the carrier in a revolution dipping method at first and loading gold in a dipping-ammonia washing method. The invention has the advantages of simple preparation method, uniform dispersion of gold particles and high load efficiency. The catalyst provided by the invention has the advantages of good activity and selectivity and low consumption in preparation of cyclohexanone and cyclohexanol through cyclohexane oxidation.

Present invention discloses a method utilizes nano gold particle catalytic rising to raise surface plasma resonance transducer sensitivity. It coats 20-35 nm silicon dioxide thin layer on plasma resonance transducer metallic film surface, utilizes nano gold particle catalyzing to enhance surface plasma resonance signal and to raise plasma SPR transducer sensitivity. Said invention makes nano gold particle catalyzing rising in surface plasma resonance SPR transducer, in nano gold particle catalyzing process, gold or silver ion depositing on nano gold particle surface by catalytic reduction not depositing on metallic film surface to result in background heightening. Said method has simple, easy operation and high sensitivity.

A facial mask includes a permeable sheet and a nanometer metal layer coated on a side of the permeable sheet. The permeable sheet is made of adhesive-bonded fabric and is formed with a nose portion, three openings corresponding to eyes and mouth, and multiple split lines. The nanometer metal layer is composed of nanometer gold particles or nanometer sliver particles. A skin care substance layer is coated on the at least one nanometer metal layer. It is very easy and convenient to clean the facial mask, so the facial mask can be used repeatedly.

The invention relates to a nano gold/graphene oxide composite material and a preparation method thereof, which are used for enhancing the conductivity of a material. The preparation method of the nano gold/graphene oxide composite material is as follows: based on graphene oxide dispersed in a water phase as a carrier, nano gold particles with even particle distribution are generated through in situ direct reduction of chloroauric acid on the surface of the carrier so as to obtain the nano gold/graphene oxide composite material; and preferably, sodium borohydride is added in a dispersion obtained by fully mixing the graphene oxide with HAuCl4 under the severe stirring condition so that HAuCl4 is reduced, so as to obtain the nano gold/graphene oxide composite material. According to the invention, experiment conditions are simple, an operation method is simple and easy, and a protective agent is not added in the experiment process; the vast majority of prepared nano gold particles are modified on the surface of graphene oxide (GO), the shape is regular, the state is stable, particle size is evenly distributed, and the conductivity and biocompatibility of GO can be enhanced by modifying the nano gold on the surface of GO.