62 results about "1-octadecene" patented technology

The invention discloses a preparation method of a surfactant for a photo-reduction method of a Ag / TiO2 nano heterogenous junction by virtue of induction. The preparation method comprises the following steps of: 1) dispersing 0.1-1.0g of TiO2 nano crystal taking 0.1-0.5ml of oleic acid, oil amine or 1-octadecene as surfactant into 50ml of chloroform, stirring to be uniform, so as to obtain TiO2 nano crystal dispersion; 2) taking 0.2-0.5g of AgNO3 and dissolving AgNO3 into 10ml of ethanol, adding the TiO2 nano crystal dispersion, stirring to be uniform, then transferring mixed solution into a three-opening flask, degassing for 20-60min with argon, sealing, and carrying out photo-reduction synthesis for 30-90min under the conditions of stirring and taking an xenon lamp as a light source, thus the Ag / TiO2 nano heterogenous junction is obtained. By applying the preparation method disclosed by the invention, novel photocatalysis material with low cost and high efficiency and other photoelectric functional materials are hopeful to be developed. The synthetic method disclosed by the invention is also effective when being used for preparing a more complex functional nano structure.

The invention provides a preparation method of an ultrasmall NaYF4:Yb<3+>,Er<3+> upconversion nanoparticle luminescent material, which comprises the following steps: a) lowering the upconversion nanoparticle size by lowering the rare earth acetate concentration in the reactants or regulating the contents of oleic acid and 1-octadecene; and b) controlling the nucleating and crystallizing process by the repeated oscillation design of reaction temperature, thereby further lowering the upconversion nanoparticle size. The ultrasmall NaYF4:Yb<3+>,Er<3+> upconversion nanoparticles prepared by the method have the advantages of small size (9-18nm), uniform particle size distribution and high luminescence efficiency, and are a hexagonal phase; and the preparation method has very high repeatability and favorable application prospects.

The invention relates to a preparation method of a copper-based nano solar battery material, which belongs to the preparation technique of semiconductor nano solar battery materials. A metallic compound is taken as a precursor, mercaptan, elemental sulfur, elemental selenium and the like as sulfur raw materials, and oleylamine, oleic acid, 1-octadecene and TOPO (Tri-Octyl-Phosphine Oxide) as a main high-boiling-point solvent. By adopting a thermal decomposition method, the copper-based nano solar battery material which is different in morphology, good in crystallinity degree, good in monodispersity, controllable in phase structure and adjustable in optical property is prepared under unharsh reaction condition, thus basis is established for application and industrial production of the high-quality nano copper-based solar material in the aspects of solar battery preparation and photocatalyst design. The copper-based nano solar battery material has the characteristics of controllable product property, high quality, simple production process, environmental-friendliness and the like, and is easy to industry.

The invention relates to the synthesis method of indium phosphide fluorescent quantum dots, which belongs to the fields of the nano-material preparation technology and the biological analysis and detection technology. The synthesis method is characterized in that the method can synthesize the biocompatible indium phosphide quantum dots by the wet method synthesis using 1-octadecene as the solvent, tetradecanoic fatty acid as the stabilizer, metal phosphide as the phosphor source and metal indium salt as the precursor. The synthesis method comprises the following steps: reacting the metal phosphide with a strong acid to generate phosphine, introducing the phosphine gas into the indium salt precursor solution, and reacting to obtain the indium phosphide quantum dots. The method has the advantages of simple operation, mild condition, low cost, high yield and adjustable emission spectrum of the indium phosphide fluorescent quantum dots, etc.

The invention relates to esterification modified xanthan gum and its preparation method. The method is as follows: in a mixed solvent of dimethyl sulfoxide (DMSO) and chloroform, PMAO is used as a modifier and an esterification reaction is carried out between maleic anhydride group in the PMAO and hydroxide radical (-OH) in xanthan gum molecules so as to obtain the esterification modified xanthan gum. The method provided by the invention has advantages as follows: reaction condition is mild; the raw materials are easily available; conversion rate of reactants is high; and product aftertreatment is convenient. The modified xanthan gum has better temperature resistance, salt resistance and ageing resistance. Meanwhile, the modified xanthan gum is biodegradable, and the degradation product causes no pollution to the environment. The esterification modified xanthan gum is a nontoxic and environmentally friendly material.

The invention discloses a manganese oxide nanoparticle contrast agent for specifically targeting brain glioma. The manganese oxide nanoparticle contrast agent is prepared by the following steps: dispersing an inorganic manganese compound and sodium oleate into a mixed liquor of ethanol, water and normal hexane, and reacting at 50-70 DEG C to prepare precursor manganese oleate; dissolving the manganese oleate precursor into 1-octadecene, and stirring at 80-100 DEG C under protection of nitrogen; heating to 280-320 DEG C under protection of nitrogen, and refluxing to obtain oleic acid-encapsulated manganese oxide nanoparticles; dispersing the oleic acid-encapsulated manganese oxide nanoparticles into methylbenzene; adding a little of acetic acid, carrying out ultrasonic treatment, and adding a silylating reagent to react, so as to obtain silylanized manganese oxide nanoparticles; dispersing the manganese oxide nanoparticles into deionized water, and bonding specifically targeted molecules of the brain glioma, so as to obtain the manganese oxide nanoparticles for specifically targeting the brain glioma. The manganese oxide nanoparticles disclosed by the invention can be used as a novel nuclear magnetic resonance imaging (MRI) contrast agent for early diagnosis and boundary definition of the brain glioma.

The invention relates to a sonochemical preparation method for CsPbBr3 quantum dots. The method comprises the following steps: analytically pure Cs2CO3 is dissolved in a 1-octadecene and oleic acid mixed solution, and the solution is cooled to room temperature after Cs2CO3 is completely dissolved; analytically pure PbBr2 is dissolved in a 1-octadecene, oleic acid and oleylamine mixed solution, and the solution is cooled to room temperature after PbBr2 is completely dissolved; obtained precursor solutions are mixed uniformly and placed in an ultrasonic reactor for an ultrasonic reaction; a prepared solution is centrifugally washed three times with toluene, the solution is dissolved in toluene finally, and the CsPbBr3 quantum dot material is obtained. Compared with the traditional hot injection method, the CsPbBr3 quantum dot material prepared with sonochemical synthesis has the advantages that reaction conditions are simple, high temperature is not needed and energy is saved. The luminous range of the quantum dot material can be adjusted conveniently by controlling reaction time, and the quantum dots have excellent optical unicity.

The invention discloses a method for purifying quantum dots. The method includes the steps that a quantum dot solution containing a cationic precursor is heated to a first preset temperature, 1-octadecene is added, uniform mixing is carried out, and quantum dot mixed liquor is obtained; then the quantum dot mixed liquor is cooled to a second preset temperature, and a non-polar organic solvent is added; finally, the quantum dot mixed liquor obtained after the above-treatment is cooled to room temperature, a corresponding polar organic solvent is added, then the quantum dot mixed liquor is centrifugally separated, and the purified quantum dots are obtained. According to the method for purifying the quantum dots, the problem that excessive cationic precursors in quantum dot mixed liquor are difficult to clean is effectively solved, the fluorescence intensity of the obtained quantum dots is not weakened, purity is high, unforeseeable influences of the excessive cationic precursors on a device assembled by the quantum dots can be effectively avoided, and meanwhile preparation repeatability of the QLED device is also improved. The method is good in controllability and easy to repeat.

The invention belongs to the field of catalyst synthesis, and particularly relates to a preparation method and an application of a catalyst for visbreaking behavior of heavy oil by aquathermolysis. The method comprises specific steps as follows: ferric chloride is weighed and added to a three-neck beaker, ethanol, water, n-hexane and oleic acid are added to the three-neck beaker in sequence, magnetic stirring is performed, NaOH is added, heating and reflux condensation are performed, after a ferric oleate compound and an oleic acid mixture are synthesized and added to sodium alkylbenzene sulfonate, a mixture is dissolved in octyl ether, 1-octadecene or 1-eicosylene, a mixed solution is subjected to temperature programming and then cooled to the room temperature, ethanol is added to the solution, centrifugal separation is performed, and the target product, namely, the catalyst for visbreaking behavior of the heavy oil by aquathermolysis is obtained. The target product is cheap and easily available and has low energy consumption and excellent visbreaking effect, and physical properties and nanoscale can be set by selecting correct reaction temperature, reaction solvent or reaction time.

The embodiment of the invention discloses a quantum dot and a preparation method thereof. The method comprises the following steps of: adding sulfur powder into 1-octadecenoic acid, and mixing to obtain sulfur precursor solution; adding a Zn salt, an M salt, an In salt and an organic encapsulant into 1-octadecenoic acid, and heating to obtain transparent solution, wherein the M salt is a Cu salt or an Ag salt; and heating the transparent solution in the presence of a protective gas, and mixing the heated transparent solution and the sulfur precursor solution to react to obtain the ZnxMyInS1.5<+>x<+>0.5y quantum dot. In the preparation method provided by the invention, the synthesis condition is simple. The quantum dot prepared by the invention does not contain highlytoxic elements, such as Cd, Pb, Hg, As and the like, and has relatively high biocompatibility. In addition, the quantum dot prepared by the method has high fluorescence intensity, so that the quantum dot can serve as a fluorescent probe which is combined with biomolecules, can be applied to living cell image formation, tracking and monitoring of protein, viruses or enzymes, DNA analysis, DNA biologic sensing, disease diagnosis and the like.

The invention relates to the field of cultural relic detection, and discloses a high sensitivity detection method for a silk cultural relic. The method comprises the following steps of: preparing puresilk fibroin powder, and simultaneously extracting the silk fibroin in a cultural sample; sequentially modifying gold nanoparticles, hollow polyacrylic acid-dopamine complex, polymethyl methacrylate-maleic anhydride / 1-octadecene alternating copolymer spherical nanobead, mouse anti-silk fibroin monoclonal antibody on the surface of cleaned glassy carbon electrode by a layer-by-layer self-assemblymethod under the action of NHS / EDC solution; and detecting the silk fibroin solution and the cultural sample solution by using the modified electrode. The high sensitivity detection method for the silk cultural relic has high sensitivity, low detection limit and good reproducibility, and can detect the silk cultural relics with high sensitivity.

The invention discloses a core-shell structured CuInS2 / ZnS nanorod and a preparation method thereof. The preparation method comprises the steps of mixing indium chloride, cuprous chloride and lauryl mercaptan to obtain a CuInS2 nanorod; mixing and heating zinc fatty acid, lauryl mercaptan and 1-octadecene to obtain zinc fatty acid precursor; rapidly filling the obtained zinc fatty acid precursor into CuInS2 nanorod solution then slowly filling in the rest of the zinc fatty acid precursor for reaction; performing repeated dissolution and precipitation on reaction products and then performing centrifugal purification to obtain the core-shell structured CuInS2 / ZnS nanorod. The core-shell structured CuInS2 / ZnS nanorod obtains a large light energy absorbing section for linear polarized absorption and polarized emission and meanwhile can inhibit Auger non-radiative recombination and achieves relatively high illumination efficiency. Meanwhile, the high-quality core-shell structured CuInS2 / ZnS nanorod can be applied to lighting and display.

The invention provides a method for increasing quantum yield of an up-conversion nano material. The method for increasing quantum yield of the up-conversion nano material comprises the following steps: (1) by taking YCl3, NH4F and NaOH as main raw materials, and taking oleic acid and 1-octadecene as solvents, reacting at a high temperature for 30-240 minutes, washing, centrifuging and drying to obtain a core NaYF4; (2) by taking the core NaYF4, LnCl3 (Ln represents Y, Yb and Er), NH4F and NaOH as main raw materials, and taking oleic acid and 1-octadecene as solvents, reacting at a high temperature for 10-60 minutes, washing, centrifuging and drying to obtain a core-shell structure NaYF4@NaYF4:Yb, Er; and (3) by taking the core-shell structure NaYF4@NaYF4:Yb, Er, YCl3, NH4F and NaOH as main raw materials, and taking oleic acid and 1-octadecene as solvents, reacting at a high temperature for 10-60 minutes, washing, centrifuging and drying to obtain a core-shell structure NaYF4@NaYF4:Yb, Er@NaYF4 which is delta-doped NaYF4:Yb, Er. By adopting the method, the quantum yield of the NaYF4:Yb, Er is greatly increased; the method has important significance for expanding application of the NaYF4:Yb, Er to biomarkers, analysis and detection, fluorescence imaging and solar cells.

The invention discloses a preparation method of a gadolinium-modified bismuth sulfide nanometer diagnosing agent used for MRI (magnetic resonance imaging) and CT (computerized tomography) double-mode imaging instruction. According to the preparation method, oleic acid, oleylamine, 1-octadecene, neodecanoic acid bismuth and thioacetamide are used as raw materials to composite bismuth sulfide, diethylenetriamine pentaacetic acid bicycle-anhydride and bismuth trichloride are used to prepare a Dd-DTPA-OA ligand, and then the Dd-DTPA-OA ligand is modified by the bismuth sulfide to obtain a gadolinium-modified bismuth sulfide nanometer material. The preparation method of the gadolinium-modified bismuth sulfide nanometer diagnosing agent has the advantages that a research background of an existing medical contrast agent is combined, a CT / MRI double-mode contrast agent preparation is simplified, and the preparation method is simple in preparation, highly controllable, high in efficiency, easy for industrialized production and the like.

The invention discloses NOBF4 modified up-conversion nanoparticles, a Dye-NOBF4-UCNPs nanometer probe, preparation methods of the nanoparticles and the Dye-NOBF4-UCNPs nanometer probe, and a sulfur-containing compound detection method. The preparation method of the NOBF4 modified OA-NaGdF4:Yb,Er@OA-NaGdF4:Yb,Nd comprises: 1) carrying out a co-precipitation reaction on a sodium-containing alkalinecompound, 1-octadecene, oleic acid, a neodymium source, an ytterbium source, a gadolinium source, NH4F and OA-NaGdF4:Yb,Er to obtain OA-NaGdF4:Yb,Er@OA-NaGdF4:Yb,Nd up-conversion nanoparticles; and 2)carrying out a contact reaction on the OA-NaGdF4:Yb,Er@OA-NaGdF4:Yb and NOBF4. According to the present invention, the nanometer probe has advantages of wide detection range, high sensitivity, good selectivity, low cost, rapid detection and the like in detection of sulfur-containing compounds.

An additive comprising, dissolved in a solvent, an asphaltene dispersant selected from the group consisting of α-olefin / vinyl pyrrolidinone copolymers. The copolymer can comprise at least one α-olefin selected from the group consisting of mono-α-olefins, at least one α-olefin selected from the group consisting of linear α-olefins and / or at least one α-olefin is selected from the group consisting of 1-hexadecene, 1-octadecene, 1-eicosene, 1-docosene, 1-tetracosene, 1-hexacosene, 1-octacosene and 1-triacontene. The additive can comprise a copolymer of 2-pyrrolidinone, 1-ethenyl monomer. The copolymer can have a Hansen Solubility Parameter (HSP), δ, of greater than 16, 17 or 18 MPa1 / 2. The solvent can be selected from the group consisting of aromatic solvents, such as 1-methyl naphthalene, bis-(m-phenoxyphenyl)ether, o-xylene, toluene and heavy aromatic solvents. Also provided is a method of inhibiting asphaltene precipitation in a fluid by introducing into the fluid an asphaltene dispersant selected from the group consisting of α-olefin / vinyl pyrrolidinone copolymers.

The invention discloses a zinc ferrite material and a preparation method thereof, and belongs to the field of magnetic materials. The preparation method comprises the following steps of preparing materials, wherein raw materials comprise ferric acetylacetonate, zinc acetylacetonate, a surfactant and a solvent, the solvent is benzyl ether or 1-octadecene or oleylamine, the mole ratio of the zinc acetylacetonate to the ferric acetylacetonate is 0.1-0.8, the mole ratio of the total amount of the ferric acetylacetonate and the zinc acetylacetonate to the surfactant is 0.01-0.85, and the quantity of the solvent is determined in a manner that the ferric acetylacetonate and the zinc acetylacetonate can be fully dissolved by the solvent; placing the raw materials in protective gas environment, and performing uniform mixing at room temperature; and then performing low-speed warming, performing quick-speed warming, and performing cooling so as to obtain resultant granules namely the zinc ferrite material. The zinc ferrite material prepared by the method disclosed by the invention has extra-high saturation magnetization intensity, and can maintain favorable magnetic properties after being subjected to high temperature calcination.

The invention discloses a continuous automated synthesis method of highly controllable quantum dots. The continuous automated synthesis method comprises: a perovskite quantum dot synthesis method: weighing 0.6 g of cesium carbonate CsCO3, 2.2 mL of oleic acid and 15 mL of 1-octadecene, carrying out mixing stirring heating until cesium carbonate completely reacts, weighing 2.5 mL of 1-octadecene, 0.18 mmol lead halide, 0.27 mL of oleylamine and 0.27 mL of oleic acid, heating to a temperature of 120 DEG C until the lead halide is completely dissolved, slowly injecting into a microfluidic reactorthrough a peristaltic pump and other devices according to a certain ratio within the same time, controlling the temperature and the temperature of a micro-reaction chamber, opening an external lightfield, and collecting the obtained perovskite quantum dot product; and a carbon quantum dot synthesis method: dissolving 1.46 g of lysine in 100 mL of distilled water, dissolving 1.76 g of ascorbic acid in 100 mL of distilled water, slowly injecting into a microfluidic reactor, heating to a temperature of 140 DEG C, opening an external field, and collecting the carbon quantum dot product solution,wherein the adjustability of the reaction time is ensured through the optimized pipeline design.

The invention discloses a static preparation method of a manganese-doped lead-cesium halide fluorescent glass thin film. The static preparation method comprises the following steps of firstly, dissolving cesium carbonate and oleic acid in 1-octadecene, and obtaining a cesium oleate solution under a nitrogen protection condition; secondly, rapidly injecting the cesium oleate solution into a manganese-doped lead halide salt solution which is completely dissolved and has a temperature range of 140-200 DEG C to obtain a product, namely Mn-doped CsPbX3 quantum dot, and performing centrifugal purification, wherein the quantum dot can be dissolved in n-hexane and methylbenzene; and finally, coating the prepared Mn-doped CsPbX3 quantum dot combined with ink onto a surface of glass to form a layerof thin film with uniform thickness, wherein the thin film is clamped between two pieces of glass, the thin film is hermetically isolated with an external environment by vacuumizing and bubble discharging, and the manganese-doped lead-cesium halide quantum-dot fluorescent glass thin film is obtained. The static preparation method has the advantages that the fluorescent glass thin film is excellentin stability and durability.

The invention discloses halogen-doped lead chalcogenide nanometer crystal and a preparation method and an application thereof. Specifically, the method comprises the following steps: (1) preparing a lead precursor from diphenylthiocarbazone, oleic acid and 1-octadecene; (2) carrying out reaction by a trimethylsilyl halogen compound, di(trimethylsilyl) chalcogenide, the 1-octadecene and the lead precursor obtained in the step (1); and (3) obtaining the halogen-doped lead chalcogenide nanometer crystal through after-treatment. By the precursor containing a halogen element, the halogen-doped lead chalcogenide nanometer crystal has good compatibility with the precursor containing chalcogen, and can almost be dissolved with the precursor freely; and the preparation method is simple and feasible. Compared with a traditional schottky structure, an open-circuit voltage and a short-circuit current of a device are greatly improved; meanwhile, the condition that a fill factor only has minimal attenuation is ensured; and the conversion efficiency is improved by about 75%.

The invention discloses a method for preparing a CdSe quantum dot, and belongs to the technical field of nanometers. According to the method, a Cd precursor solution and an Se precursor solution are formed by using Se powder as an Se source, cadmium acetate dihydrate (C4H5CdO4.2H2O) used as a cadmium source, trioetylphosphine used as a solvent of the Se powder, and oleic acid, 1-octadecene and n-octylamine used as a solvent of the cadmium acetate dihydrate; reacting the Cd precursor solution and the Se precursor solution at low temperature (90-160 DEG C) to obtain the CdSe quantum dot. The precursors are quickly injected and need not to react at high temperature, medicinal materials are treated in the atmosphere, so that the requirement to reaction conditions is greatly reduced, and the obtained CdSe quantum dot has the advantages of single-dispersion and narrow granularity distribution, high fluorescent strength and long fluorescent service life; the synthesized CdSe quantum can be applied to the fields of luminescent devices, photovoltaic devices, biomedical imaging and the like.

The invention belongs to the field of organic chemical synthesis, and particularly relates to octadecyl organic silicon wax and a preparation method and application thereof. The preparation method of the octadecyl organic silicon wax comprises the following steps: firstly, mixing D4H with hydrogen-terminated silicone oil, reacting under the action of sulfonated cationic resin serving as a catalyst, distilling under a reduced pressure, and filtering to obtain hydrogen-terminated silicone oil of which a side chain contains reactive hydrogen; then, mixing the hydrogen-terminated silicone oil of which the side chain contains the reactive hydrogen with 1-octadecene, performing a silicon-hydrogen addition reaction under the action of chloroplatinic acid serving as a catalyst at the temperature of 90 to 130 DEG C for 6 to 10 hours, and distilling under a reduced pressure after finishing the reaction to obtain the octadecyl organic silicon wax. The invention further provides an organic silicon wax emulsion containing the octadecyl organic silicon wax. The emulsion has the advantages of proper viscosity, high moisture-keeping performance, and high stability.

A film-forming composition formed by solubilizing higher concentrations of polyanhydride resins using a mixture of a fatty acid triglyceride derivative and a diester of 2-Octanol and Adipic Acid. In one embodiment, a composition in accordance with the invention comprises between about 1% and 55% by weight of Furandione (2,5)-Polymer with 1-Octadecene; between about 10% and 35% by weight of Dicapryl Adipate; and between about 10% and 35% by weight of Methyl Acetyl Ricinoleate. Such a composition may impart a water resistant property to oil-in-water and water-in-oil emulsions, and to anhydrous solid and semi-solid preparations, while remaining solubilized, stable and pourable at 25° C.

The invention specifically relates to a fluorescence detection method for risky material fluorine in tea leaves and belongs to the technical field of food safety detection. The fluorescence detectionmethod for risky material fluorine in tea leaves provided by the invention specifically comprises the following steps: taking a methyl alcohol mixed liquor of yttrium chloride, ytterbium chloride, holmium chloride, oleic acid, 1-octadecene, ammonium fluoride and sodium hydroxide as a raw material for preparing a hexagonal up-conversion nano-crystal; adding cyclohexane, IGEPAL CO-520, tetraethyl orthosilicate and APTES, thereby acquiring an aminated hexagonal up-conversion nano-crystal; mixing with a curcumin aqueous solution, thereby acquiring a specific mixed detection system; establishing afluorine ion detection standard curve; determining the fluorine content in the to-be-detected tea leaves. According to the invention, high sensitivity and specificity detection for fluorine in tea leaves is realized in the manner of preparing a fluorescence signal enhanced substrate through nanometer controllable self-assembling and establishing a stable specific fluorine ion detection system, sothat the fluorescence detection method has wider linear detection scope and lower detection limit and is expected to be applied to large-scale detection for risky material fluorine in tea leaves.

The invention provides a preparation method of a quantum dot semi-interpenetrating network lithium-sulfur battery composite cathode material. The preparation method comprises the following steps: dispersing aluminum isopropoxide, polyacrylamide and graphene in isopropanol, thus obtaining dispersed glue solution; mixing zinc acetate, oleic acid and 1-octadecene, injecting a sulfur source and performing reaction, adding a sulfur elemental substance and a carbon source, dispersing at a high speed, further cooling, cleaning with deionized water and drying, thus obtaining a quantum dot ZnS / S / C compound; and adding the quantum dot ZnS / S / C compound into the dispersed glue solution, stirring for 1-2 hours, then performing spray drying, and performing de-polycondensation on aluminum isopropoxide inpresence of water to obtain a semi-interpenetrating network ZnS / S / C compound formed by alumina sol and polyacrylamide gel, thus the quantum dot semi-interpenetrating network lithium-sulfur battery composite cathode material is obtained. The preparation method provided by the invention adds sulfur and carbon in a process that zinc sulfide quantum dots are formed, and quantum dot sulfide and the sulfur elemental substance are combined, so that full participation of sulfur in electrolyte reaction is guaranteed, polysulfide shuttling is prevented, and volume expansion deformation is effectively prevented.

The invention relates to a high-performance PdPtPb nanosheet catalyst for fuel cells and a preparation method thereof, which belong to the field of electrochemistry and new energy. Palladium acetylacetonate or palladium acetylacetonate and platinum acetylacetonate is / are used as reaction precursor(s), lead acetylacetonate is used as a shape guiding agent, ascorbic acid is used as a reducing agent,1-octadecene and oleamine are used as reaction solvents, and XC-72, Ketjen black, graphene or ordered mesoporous carbon is used as a carbon carrier. The materials are heated in a reaction kettle for4-8 hours at the temperature of160-200 DEG C to obtain PdPtPb nanosheets with a two-dimensional structure. The high-performance PdPtPb nanosheet catalyst for fuel cells prepared in the invention has good dispersion, high catalytic activity dispersion and stability, and the preparation method is simple and easy to control.

The invention relates to a preparation method for preparing hydrophilic quantum dots based on a novel amphiphilic polymer ultrasonic emulsion process. The preparation method comprises the following steps: adding polymaleic anhydride-alt-1-octadecene and quantum dots into a reactor, and then adding dichloromethane into the reactor to form an oil phase of the polymaleic anhydride-alt-1-octadecene; adding a ring opening agent 2,2'-(ethylene dioxy)bis(ethylamine) into the reactor, and then adding deionized water into the reactor to form an aqueous phase of the 2,2'-(ethylene dioxy)bis(ethylamine); dropwise adding the oil phase into the aqueous phase to form an emulsion disperse system with uniform oil and water, and performing ultrasonic dispersion on the obtained emulsion disperse system with an ultrasonic disperser; performing rotary evaporation on the emulsion on a rotary evaporator at room temperature; after an organic solvent volatilizes, performing further rotary evaporation until the solution is clear before stopping the rotary evaporation; and centrifuging to obtain hydrophilic quantum dots, wherein the effective particle size is 40-140nm. The preparation method has the advantages of simple preparation process, short cycle and high yield and is suitable for mass production.

The invention provides a water soluble silver protective agent and a preparation method thereof, wherein the water soluble silver protective agent is an aqueous solution containing fatty alcohol polyoxyethylene ether, N-benzyl phenylacetamide and a protective additive, and the protective additive is one or more substance selected from the group consisting of cyclododecane, 1-octadecene, 7-octadecene and 1-laurylene. The invention also provides a chemical silvering method and a surface silver plated workpiece obtained by the method, and the method comprises first chemical silvering and then silver layer protection treatment by use of the water soluble silver protective agent. The water soluble silver protective agent can form a protective film with a layer of organic molecular structure on the surface of the silver plating layer, direct exposure to air or other corrosive environment of the silver plating layer can be avoided, oxidation and corrosion of the silver plating layer can be prevented, the silver plating layer has better corrosion resistance, good conductivity of the silver plating layer can be ensured, and good metallic luster of the silver plating layer can be maintained.

The invention discloses an aluminum distearate coating method for improving the stability of perovskite quantum dots. The method includes the steps of: adding lead halide and aluminum distearate in amolar ratio of 1:(0.2-2) into a mixed solution of oleylamine, oleic acid and 1-octadecene in a volume ratio of 0.7:0.7:5, conducting heating stirring under a vacuum condition to obtain a lead halide precursor solution, heating the lead halide precursor solution under the protection of nitrogen, injecting a cesium source solution, carrying out reaction, then performing cooling to room temperature to obtain a crude product aluminum distearate coated colloidal perovskite quantum dot dispersion liquid, and performing purification to obtain an aluminum distearate coated colloidal perovskite quantumdot dispersion liquid. The stearic acid in the aluminum distearate adopted by the invention can be combined with metal ions on the surfaces of the perovskite quantum dots to effectively passivate thesurface defects of the quantum dots, thus increasing the fluorescence quantum yield, and improving the chemical and optical stability of the quantum dots under illumination, high temperature and polar environments.