42 results about "Tetraoctylammonium bromide" patented technology

The invention provides a preparation method of a graphene/modified titanium dioxide sol composite material. The preparation method is characterized by comprising the steps of: providing titanium dioxide nano sol and graphene; carrying out a reduction reaction under the action of mercapto carboxylic acid and sodium borohydride with auric chloride acid as a raw material, thiol as a surfactant and tetraoctyl ammonium bromide as a phase transfer agent to obtain modified gold nano sol; respectively dispersing the modified gold nano sol and the titanium dioxide nano sol in organic solvents, and mixing to obtain gold nano sol modified titanium dioxide sol; and mixing the gold nano sol modified titanium dioxide sol with a toluene solution of graphene, uniformly dispersing and filtering to obtain the graphene/modified titanium dioxide sol composite material. The modified titanium dioxide nano sol can be uniformly dispersed on the surface of graphene and does not agglomerate.

The invention relates to a method for preparation of a Cu2O and Au/Cu2O core-shell heterostructure nano cube through thermal oxidation. Acccording to the method, a copper mesh micro-gate is used as a copper source, oxygen in the air is used as an oxygen source, Au nanoparticles coated with tetraoctylammonium bromide stabilizers on the surface are used as catalysts and nucleation points for growth of the Cu2O and Au/Cu2O core-shell heterostructure nanoparticles, the raw materials are heated at 300 DEG C, and the Cu2O and Au/Cu2O core-shell heterostructure nano cube can be prepared through adjusting the density of the Au nanoparticles on the copper mesh. The Cu2O nano cube mainly has two forms: a perfect cube and a cube with corners cut. The Au/Cu2O core-shell heterostructure nano cube is a core-shell heterostructure nano cube. The method has the advantages that the product purity and the selectivity are high, the synthesis process is simple, the production cost is low, no pollution can be caused, and the shape can be controlled.

The invention discloses a ZnTCPP@MOF-based electrochemical immunoassay method for microcystic toxins. The method comprises the following steps: modifying an electrode by a porphyrin-functionalized metal-organic framework ZnTCPP@MOF; increasing the stability of the ZnTCPP@MOF on the electrode by utilizing tetra-n-octylammonium bromide; and dripping microcystic toxin MC-LR antigen and monoclonal antibody, and assembling to form an electrochemical immunosensor. The electrochemical immunosensor prepared by the method disclosed by the invention is capable of realizing high-sensitivity and high-specificity detection of the microcystic toxin MC-LR, the generated electrochemical luminescence signal is stable, the lower limit of detection on the microcystic toxin MC-LR is low, and the method has excellent application prospects in the field of detection of biological and environmental microcystic toxins.

High-quality bimetallic Pt_xCu_100-x (x=54-80 at. %) nanocubes can be prepared from a hot organic solution. Synthetic conditions, such as the ratio of oleylamine/tetraoctylammonium bromide as well as the doses of 1-dodecanethiol and 1,2-tetradecanediol have been optimized to ensure a formation of Pt—Cu nanocubes. Electrochemical evaluation shows that the catalytic activity of Pt₆₀Cu₄₀ nanocubes for methanol oxidation is superior, in comparison with those of spherical Pt₆₀Cu₄₀ nanocubes and Pt nanocubes with similar sizes, implying that the {100}-terminated Pt₆₀Cu₄₀ nanocubes offer a higher activity for methanol oxidation reaction than those with mixed crystallographic facets do. As another example, it was identified that Pt₈₀Cu₂₀ nanocubes is the best electrocatalyst on the basis of the maintainable electrocatalytic activity (which is even slightly superior to that of pure Pt nanocubes) and remarkable long-term stability (˜300 hours vs 3 hours for Pt nanocubes) when being performed towards formic acid oxidation reaction.

The invention discloses a method for preparing cyclic carbonate. The method specifically comprises the following step: with a quadri-aryloxy bridged rare earth metal compound as a catalyst, catalyzing carbon dioxide and alkylene oxide to react in the present of quaternary ammonium salt, wherein the general formula of the quadriaryloxy bridged rare earth metal compound is LLn(THF), wherein L refers to ethanediamine group bridged quadri-aryloxy, Ln refers to rare earth metal ions, and the quaternary ammonium salt is one of tetrabutylammonium iodide, tetrabutylammonium bromide, tetrabutylammonium chloride, tetraoctyl ammonium bromide, bis(triphenylphosphine) ammonium chloride and benzyl butyl ammonium bromide. The rare earth catalyst in the catalysis system is clear in structure, easy to synthesize, high in catalysis activity, less in using amount, mild in reaction conditions and wide in universality to alkylene oxide. According to the preparation method disclosed by the invention, raw materials are easily available, the reaction conditions are wild, a reaction substrate is wide in universality, the reaction time is short, the yield of the target product, namely the cyclic carbonate is high, and the reaction operation and the posttreatment process are simple.

The invention provides a method for preparing a modified titanium dioxide nano particle nanotube. The method is characterized by comprising the following steps of: providing titanium dioxide nano sol; with chloroauric acid as a raw material, thiol as a surfactant and tetraoctyl ammonium bromide as a phase transfer agent, undergoing a reduction reaction under the action of thiol carboxylic acid and sodium borohydride so as to obtain modified golden nano sol; dispersing the modified golden nano sol and the titanium dioxide nano sol in an organic solvent respectively and then mixing to obtain titanium dioxide sol modified by the golden nano sol; and dropwise adding the titanium dioxide sol modified by the golden nano sol on the surface of an anodic aluminum oxide film, performing vacuum filtration, drying, calcining the composite anodic aluminum oxide film, removing the anodic aluminum oxide film, washing, and performing centrifugal separation to obtain the modified titanium dioxide nano particle nanotube. The modified titanium dioxide nano particle nanotube has a novel and stable structure, high specific surface area and excellent nano particle activity and is easily recovered and repeatedly used.

Preparation and synthesis of Au25 nanospheres with precise atom number and structure; a preparation method may synthesize the Au25 nanospheres simply and efficiently and may also serve for preparing a supported catalyst and for catalyzing organic reactions, such as Sonogashira coupling reaction. These gold cluster nanomaterials have precise microscopic structure. A synthetic method includes: dissolving chloroauric acid trihydrate (HAuCl4.3H2O) and tetraoctyl ammonium bromide (TOABr) in acetone, adding suitable 2-naphthalenethiol (2-NapSH) ligand, adding a strong reducing agent sodium borohydride for reduction, adding massive 2-naphthalenethiol at suitable temperature to allow for etching reaction to obtain the product Au25(2-NapS)18. The synthetic route related herein has the advantages that the materials are simple and easily accessible, reaction conditions are simple and feasible, and controlling is simple.

The invention relates to a preparation method of a phosphor, and concretely relates to a preparation method of a rare earth molybdate matrix red nanophosphor. The method comprises the following steps: reacting lanthanum nitrate or yttrium nitrate or gadolinium nitrate and europium nitrate with stearic acid to generate rare earth ion stearate, and adding a rare earth stearate precursor, stirring for dissolving to obtain an isopropanol solution of the rare earth stearate precursor; dissolving sodium molybdate in water, slowly adding an isopropanol solution of tetraoctylammonium bromide in a dropwise manner, and stirring; and mixing the isopropanol solution of the rare earth stearate precursor with the isopropanol solution of sodium molybdate, transferring the obtained mixed solution to a reaction vessel, closing, cooling to room temperature, adding excess ethanol, centrifuging, collecting products at the bottom of a centrifuge tube, washing with ethanol, n-hexane and water to obtain the rare earth molybdate matrix red nanophosphor. The method can effectively control the morphology and the particle size of the molybdate matrix red nanophosphor, and allows the prepared rare earth molybdate matrix red nanophosphor to have the advantages of uniform sphere, small and uniform particles, nanometer level reaching, good dispersibility and large luminescent intensity, and satisfy white light LED red phosphor needs.

The invention discloses a nano silicon dioxide particle surface modifying method based on charge environment control and application thereof. The modifying method comprises the following steps of: weighing and adding 100 parts by weight of nano SiO2 into a dimethylbenzene solution containing 0.1-0.5 part by weight of tetraoctylammonium bromide, fully stirring and dispersing, then adding 0.1-3 parts by weight of silane coupling agent, carrying out constant-temperature reaction on the dispersed suspension under a boiling state after ultrasonic dispersing, carrying out subsequent processing after the reaction is ended to obtain the silane coupling agent modified nano SiO2 under charge environment control. A SiO2 particle modified by using the modifying method carries an organic matter with unsaturated double bonds on the surface, thus the dispersibility of the SiO2 particle in a polymer matrix is improved, and various performances of the polymer matrix can be greatly improved when the SiO2 particle is added in a polymer polymerization system.

The invention discloses a method for preparing gold-copper alloy nano particles. The method includes the specific steps that (1) a mixed solution of a copper precursor and a gold precursor is prepared, wherein in the mixed solution, the concentration of the copper precursor is the same as the concentration of the gold precursor; (2) methylbenzene and tetraoctyl ammonium bromide are added into themixed solution to be sufficiently stirred, the copper precursor and the gold precursor are transferred into an organic phase, separation is achieved through a liquid dividing hopper, a water layer isremoved, and an organic mixed solution is obtained; and (3) under the inert atmosphere, after the organic mixed solution is stirred, a reducing agent aqueous solution is added drop by drop, room temperature stirring is continuously carried out after the reducing agent aqueous solution is completely added, liquid dividing is finally carried out, obtained nano gold-copper alloy suspension liquid isconcentrated, and the gold-copper alloy nano particles are obtained. According to the method, the organic phase is selected for providing a protection environment for the nano particles, and unstability, agglomeration and other phenomena easily caused when the nano particles are synthesized in a water phase are avoided; and adopted reaction conditions are soft, and a strategy is provided for preparing a duplex metal nano-alloy catalyst.

The invention provides a preparation method of a carbon nano-sphere/modified titanium dioxide nano-sol composite. The preparation method is characterized by comprising the following steps: providing titanium dioxide nano-sol and carbon nano-spheres; using chloroauric acid as the raw material, mercaptan as a surfactant and tera-n-octylammonium bromide as the phase transfer agent to perform a reduction reaction under the actions of mercaptocarboxylic acid and sodium borohydride and obtain modified gold nano-sol; respectively dispersing the modified gold nano-sol and the titanium dioxide nano-sol in an organic solvent, mixing to obtain titanium dioxide sol which is modified by the gold nano-sol; and dispersing the titanium dioxide sol modified by the gold nano-sol in the organic solvent to mix with the toluene solution of the carbon nano-spheres, and stirring evenly to obtain the carbon nano-sphere/modified titanium dioxide nano-sol composite. By adopting the preparation method provided by the invention, the surfaces of the carbon nano-spheres are uniformly coated with the modified titanium dioxide nano-sol and the modified titanium dioxide nano-sol is not agglomerated.

The invention discloses a modified nanometer SiO2 reinforced and toughened PBT (polybutylece terephthalate) high-heat-conduction flame retardant plastic for LEDs (light emitting diodes) and a preparation process of the plastic. The plastic is characterized by being prepared by using magnesium oxide, boron nitride, PBT, EVA, glass fiber, 107 glue, dibutyltin dilaurate, ethyl orthosilicate, melamine cyanurate, zinc borate, aluminum hypophosphite, bamboo charcoal, nanometer SiO2, butyltin chloride dihydroxide, graphene oxide, carbon fiber, tetra-n-octylammonium bromide, 3-isocyanatopropyltriethoxysilane and the like as raw materials. Heat conduction silicone rubber subjected to KH550 surface treatment is prepared; the nanometer SiO2 is used for performing reinforcing and toughening treatment on the PBT by using the butyltin chloride dihydroxide as a catalyst; the aluminum hypophosphite and the melamine cyanurate are used for preparing a composite flame retardant; the modified nanometer SiO2 reinforced and toughened PBT high-heat-conduction flame retardant plastic for the LED is obtained.

The invention discloses a gas sensor based on carbon nanotubes and metal nanoparticles and a construction method thereof. The construction method comprises the following specific steps: 1) mixing andstirring an HAuCl4 solution, a toluene solution of tetraoctyl ammonium bromide, a decanethiol solution and a sodium borohydride solution to obtain a gold nanoparticle solution covered with decanethiol; then adding 1,9-nonanedithiol and stirring to prepare gold nano-sol covered with the 1,9-nonanedithiol; 2) mixing a carbon nanotube hexane dispersion solution and the gold nano-sol covered with the1,9-nonanedithiol and stirring to form a compound solution; 3) immersing a micro-electrode into the compound solution, and adding a dichloromethane solution of a crosslinking agent and stirring at room temperature; finally, washing and drying the micro-electrode by blowing; connecting the micro-electrode with a multi-path electrical universal meter, and putting into a gas chamber so as to realizeconstruction of the gas sensor. The gas sensor disclosed by the invention can be used for qualitatively and quantitatively detecting common gas including alcohols, aldehydes, benzenes, alkanes and thelike in the atmosphere and has high sensitivity.

The invention discloses heat-preservation plastic door and window filler. The heat-preservation plastic door and window filler is prepared from the following raw materials in parts by weight: 1-2 parts of tetraoctyl ammonium bromide, 0.5-0.8 part of mercapto carboxylic acid, 1-2 parts of polyethylene glycol, 3-4 parts of nano-level titanium dioxide sol, 3-4 parts of hollow glass micro-spheres, 2-3 parts of hollow borosilicate micro-spheres, 0.7-1 part of nitrilotriacetic acid, 20-30 parts of modified saw dust, 180-200 parts of light calcium carbonate and 60-80 parts of water. Calcium carbonate filler disclosed by the invention is subjected to surface modification, has excellent reinforcing performance, can be well compatible with PVC, and can be used for increasing the strength of plastic doors and windows; the heat preservation performance of the plastic doors and windows can be increased by adopting the hollow glass micro-spheres and the hollow borosilicate micro-spheres; and by adopting the modified saw dust, the filler has good compatibility with PVC, and the heat preservation performance, impact resistance and coloring performance of the doors and windows can be increased.

The invention discloses a high-toughness and aging-resistant ABS material, which comprises the following raw materials by weight: 100 parts of ABS resin, 0.5-5.0 parts of alkylated graphene oxide or alkylated reduced graphene oxide and 1.0-10.0 parts of a nano cellulose/attapulgite composite material. Compared with the prior art, according to the invention, graphene oxide is alkylated by tetraoctyl ammonium bromide and 1-iodododecane, so that the dispersity of graphene oxide in a polypropylene material can be remarkably improved, and the toughness of the ABS material is remarkably optimized; moreover, the nano cellulose/attapulgite composite material is also added, so that the toughness and aging resistance of the ABS material can be further improved.

The invention discloses a preparation method of a copper-molybdenum separation inhibitor. The preparation method comprises the following steps: 1) preparation of a raw material molybdenum disulfide: diluting sodium dithiazo phosphate with water to a concentration of 25%, controlling the temperature at 33 DEG C, adding a molybdenum dichloride aqueous solution with a concentration of 5%, adjusting the potential to -100 mV with a sodium sulfide solution with a concentration of 20%, carrying out a reaction for 30 min, and carrying out standing for 2 h to prepare the raw material molybdenum disulfide for later use; 2) pouring the raw material molybdenum disulfide into a stirring barrel; adding 30g of molybdenum trisulfide; 50g of zirconium boride, 45g of palladium iodide and 50g of vanadium carbide in sequence and reacting for 2 hours, adding 200g of 1-octyl-3-methylmizole hydrogen sulfate, 35g of tetraoctyl ammonium bromide and 160g of clavudine, reacting for 1 hour, concentrating to the concentration of 45% after the reaction is finished, and carrying out spray drying to obtain the powdery product copper-molybdenum separation inhibitor. The inhibitor prepared by the method is particularly effective for raw ores which are difficult to separate and low in molybdenum content.

The invention discloses a synthesis technology of Pt-Co cube nanocrystalline. The synthesis technology comprises the steps that platinum acetylacetonate and cobalt acetylacetonate serve as a metal precursor, triisopropylsilane or hexadecylformamide serves as a reducing agent, tetra-n-octylammonium bromide and oleylamine serve as a surfactant and a structure-directing agent, meanwhile, the oleylamine also serves as a solvent, and the Pt-Co cube nanocrystalline is obtained through a one-pot method. According to the synthesis technology, the shape of the Pt-Co cube nanocrystalline can be effectively controlled.

The invention provides a multi-purpose fluorocarbon emulsion and a preparation method of the multi-purpose fluorocarbon emulsion. The preparation method comprises the following steps: dissolving n-tetraoctyl ammonium bromide in methylbenzene, adding the obtained solution into chloroauric acid aqueous solution, and carrying out stirring; dissolving n-dodecyl mercaptan in methylbenzene, carrying out stirring, dissolving sodium borohydride in deionized water, after complete dissolving, adding with a fluorocarbon compound, and carrying out ice-water bath stirring; after stirring, removing the deionized water, washing residues, adding anhydrous ethanol into the obtained solution, carrying out standing for overnight precipitation at -20 DEG C, carrying out centrifugation, collecting precipitate, and carrying out drying; and adding normal saline into dipalmitoyl phosphatidyl choline, glycerinum, phospholipids and tocopherol (VE) for dissolving, and taking the supernate, thus obtaining the multi-purpose fluorocarbon emulsion. The prepared fluorocarbon emulsion is uniform in grain diameter, small in size, and good in dispersibility.

The invention relates to the technical field of optical/electrochemical analysis and detection, in particular to a two-dimensional porphyrin MOFs/TOAB modified electrode and a preparation method and application thereof. The modified electrode comprises a glassy carbon electrode, a two-dimensional porphyrin MOFs material on the surface of the electrode and tetraoctyl ammonium bromide on the surface of the porphyrin MOFs material; the preparation method of the two-dimensional porphyrin MOFs material comprises the following steps: (1) adding copper nitrate (II) trihydrate, trifluoroacetic acid and polyvinylpyrrolidone into a mixed solution of DMF (Dimethyl Formamide) and ethanol, dropwise adding a porphyrin solution dissolved in DMF and ethanol while stirring, and carrying out ultrasonic treatment on the mixed solution to uniformly disperse the mixed solution; and (2) heating the mixed solution to 80 DEG C, keeping the temperature for 3 hours, washing the obtained red nanosheet with ethanol, and centrifugally collecting the product. The modified electrode generates competitive catalytic reaction with lumilox in a water-phase electrolyte containing dissolved oxygen, the preparation is simple and convenient, and the modified electrode has the advantages of high sensitivity, large linear range, good stability and repeatability and the like when being used for detecting the lumilox.

The invention provides a dropping-coating preparation method for photoelectric-conversion composite coating films based on C60/tetra-n-octylammonium bromide. The current density of a C60/tetra-n-octylammonium bromide composite coating prepared from 30 mu L of solution containing 1.0 mM of C60 and 10 mM of tetra-n-octylammonium bromide is 1,300nA/cm, while the photocurrent density of a C60 coating prepared simply from 30 mu L of solution containing 1.0 mM of C60 is only 550 nA/cm, thus the photocurrent density of the former is shown to be 2.4 times that of the latter. The voltage response sensitivity of a photoelectric-conversion composite coating film based on C60/tetra-n-octylammonium bromide is 9 nA/mV, while the voltage response sensitivity of a pure C60 coating is only 5 nA/mV, thus the former is shown to have higher photoelectric conversion performance and voltage response sensitivity than the latter and have good application prospects.