1942 results about "Sodium borohydrate" patented technology

Solid self-stabilized borohydride fuel compositions, fuel cartridges, related methods of preparation and hydrogen generation are provided. The fuel compositions comprise mixtures of at least one borohydride salt with a cation selected from the group consisting of alkali metal cations, alkaline earth metal cations, aluminum cation, zinc cation, and ammonium cation, preferably sodium borohydride, and at least one hydroxide salt with a cation selected from the group consisting of alkali metal cations, alkaline earth metal cations, aluminum cation, zinc cation, and ammonium cation, preferably sodium hydroxide.

The invention relates to a layered double hydroxide and a preparation method thereof, belonging to the technical field of metal hydroxide preparation. A chemical formula of the layered double hydroxide is as follows: (M1(1-x)M2x(OH)2)(A<n->)x/n), wherein x is larger than or equal to 0.2 and smaller than or equal to 0.33; M1 represents any one or more of divalent metal ions including Mg<2+>, Zn<2+>, Ni<2+>, Co<2+>, Ca<2+>, Cu<2+>, Fe<2+> and Mn<2+>; M2 represents any one or two of trivalent metal ions including Fe<3+> and Al<3+>; A<n-> represents any one of interlayer anions including CO3<2->,NO3<->, Cl<-> and SO4<2->; and the grain size ranges from 12 nm to 80 nm. The invention has the advantages that the preparation method is a direct method for preparing the layered double hydroxide with high crystallinity, layered structure regularity, wide application range and adjustable particle size. The preparation method comprises the following steps: obtaining highly dispersed metal nanoparticle sol by utilizing the action of colloid mill axial shear force and the sodium borohydride reducibility, and then performing slow oxydrolysis in a hydrothermal system, and the like to generate thenano layered double hydroxide with layered structure regularity and adjustable particle size. The method has the advantages of wide application range, low cost, simple operation and environmental protection.

The invention discloses a short length-diameter ratio gold nanometer rod preparation method. A strong reducing agent of sodium borohydride is added in a hexadecyl trimethyl ammonium bromide surface modifying agent solution to reduce gold acid chloride and obtain a gold seed solution; a mixed fluid of didodecyl dimethyl ammonium bromide, gold acid chloride and silver nitrate is prepared, and an ascorbic acid solution is added thereto for obtaining a growth solution; the seed solution of a certain amount is filled into the growth solution to react for 5 to 12 hours, so as to obtain the short length-diameter ratio gold nanometer rod. The operation of the method is simple, the gold nanometer rod production rat is high, and the size distribution is narrow.

The invention provides a method for preparing a silver/graphene antimicrobial composite material, and the method provided by the invention comprises the following steps: a) providing a reductive graphene oxide-sodium polystyrene sulfate composite solution; b) heating the composite solution obtained in the step a) to 50-70 DEG C; and c) adding a silver nitrate solution into the heated composited solution obtained in the step b) for reaction, thus obtaining the silver/graphene antimicrobial composite material. The invention provides the method for preparing the silver/graphene antimicrobial composite material; and in the method, a reductive graphene oxide tablet is taken as a reducing agent for carrying out reduction on silver ions under a neutral pH condition so as to generate silver nano particles. In the method provided by the invention, no sodium borohydride is taken as a reducing agent, and in the whole preparation process, no potassium hydroxide is adopted, therefore, when the composite material prepared by the method is subjected to later application, no large biological irritant is caused. In addition, antibacterial experiments show that the silver/graphene antimicrobial composite material provided by the invention has a better antibacterial effect.

The invention belongs to the field of synthesis of nano materials, relates to the preparation of graphene/mesoporous oxide series of nano composite material, and particularly relates to a preparation method and application of graphene/cellulose/titanium dioxide composite material. The graphene/cellulose/titanium dioxide composite material is prepared by preparing graphite oxide by utilizing an improved Hummers method, carrying out ultrasound to obtain graphene oxide, reducing graphene oxide into graphene by using sodium borohydride; and finally uniformly mixing cellulose, titanium dioxide, a surface active agent (hexadecyl trimethyl ammonium bromide) and grephene. According to the invention, the synthesis method is simple, the prepared graphene/cellulose/titanium dioxide composite material is taken as an adsorbent, and a malachite green dye solution is taken as an adsorption object, the experiment shows that the composite material has an excellent adsorption removal effect. The composite material is applied to the treatment of dyes in sewage water, has the advantages of simplicity in operation, convenience, easiness in availability, high adsorption rate and the like, and has good industrially practical value.

The invention discloses a preparation method of butylphthalide, which comprises the following steps: taking phthalic anhydride as a raw material; enabling the phthalic anhydride to carry out addition reaction with the Grignard reagent of butyl halide to obtain an intermediate of o-valeryl benzoic acid; and then, reducing by sodium borohydride, and carrying out acidic cyclization to obtain the butylphthalide. The phthalic anhydride and the butyl halide which are used as raw materials in the preparation method of the butylphthalide of the invention are commercial products, and the reaction raw materials can be obtained easily. Because the Grignard reaction, the sodium borohydride reduction and the acidic cyclization are classical reactions, the operation is simple, the industrialized production can be realized easily, the yield of the butylphthalide reaches 50-60%, and the purity of the butylphthalide reaches 97-98%.

The invention relates to a MoSe2/Co0.85Se composite material for electrocatalytic water decomposition. The microtopography of the composite material is that a micron/nano rod of a MoSe2/Co0.85Se compound is loaded with a nano sheet of a molybdenum selenide/cobaltous selenide compound; the micron/nano rod has the length of is 1.5 to 3.5 microns and a diameter of 0.2 to 0.5 micron. A composite-material precursor CoMoO4 is firstly prepared and obtained through a hydrothermal reaction by using cobalt nitrate and sodium molybdate as reactive raw materials; afterwards, the composite material is made through the hydrothermal reaction by using sodium borohydride, selenium powder and the prepared composite-material precursor as raw materials. A preparation method of the MoSe2/Co0.85Se composite material is simple; the raw materials are easily obtained; the cost is low; the industrialized production is easily realized; the prepared and obtained composite material is good in electrocatalytic effect, and further, has favorable stability.

The invention discloses a preparation method of a nitrogen-doped graphene loaded platinum nano-particle catalyst. The preparation method comprises the following steps of: firstly, preparing graphene oxide (GO); secondly, preparing polyaniline/graphene oxide (PANI/GO) through a liquid-liquid interface polymerization method; thirdly, drying the PANI/GO, transferring the dried PANI/GO into a tubular furnace, and performing high-temperature treatment for 2 hours at 800 DEG C to prepare NGs (nitrogen-doped graphenes); and finally, ultrasonically dispersing the NGs into an aqueous solution, uniformly mixing the NGs with chloroplatinic acid according to a certain mass ratio, slowly adding sodium borohydride (NaBH4) into the mixed solution, and performing magnetic stirring for 8 hours to prepare the NGs loaded platinum nano-particle catalyst (Pt/NGs) which takes the NGs as a catalyst carrier to uniformly load platinum nano-particles to the surfaces of the NGs without any chemical modification. The nitrogen atoms which are doped into molecular structures of GNs not only provide a large amount of active sites for PtNPs loading, but also enhance the interaction between the PtNPs and an NGs carrier and improve the catalytic stability and catalytic activity of a nano composite material.

The invention relates to a dual-emission ratio-type quantum dot fluorescence probe for visual detection of aspirin, a preparation method and an application thereof and belongs to the technical field of preparation of material and detection of content of medicines. The preparation method of the probe includes following steps: preparing a precursor NaHTe solution from sodium borohydride, tellurium powder and water under an ultrasonic environment; adding the precursor to an aqueous solution of CdCl2.2.5H2O in the presence of thioglycollic acid; carrying out a reflux reaction with a nitrogen protecting condition to obtain required green fluorescence quantum dot and red fluorescence quantum dot; by means of a sol-gel method, wrapping the red fluorescence quantum dot with silicon spheres with amino group being connected; dispersing a green fluorescence quantum dot solution and the red fluorescence quantum dot wrapped with the silicon spheres in an MES buffer solution with addition of an EDC/NHS solution; and carrying out a reaction at room temperature in a dark place to obtain the dual-emission ratio-type quantum dot fluorescence probe. The dual-emission ratio-type quantum dot fluorescence probe is used in detection of the content of the aspirin through fluorescence quantitation and visualized analysis. The quantum dot fluorescence probe is quite good in optical performance and stability and has a capability of visualizedly detecting the aspirin.

The invention provides a gold nanocluster preparation method and an application thereof, and belongs to the technical field of nano materials. The problem of high cost of gold nanoparticle compositing in the prior art is solved. The gold nanocluster preparation method includes the steps: a, mixing polypeptide water solution with HAuCl4 solution in a reaction vessel to prepare solution A; and b, adding NaBH4 solution into the solution A for reduction, and reacting for a certain time to obtain fluorescent gold nanocluster products. A series of gold nanoclusters with different maximum emission wavelengths are composited successfully by means of taking different polypeptides as templates and sodium borohydride as a reducer. The composited gold nanoclusters have the advantages of large Stokes shift, long fluorescence lifetime, good stability and the like, can be used for detecting mercury ions (Hg2+) in water samples, and is high in detection sensitivity.

The invention discloses a nano-silver loaded graphene antibacterial agent, a graphene in-situ reduction nano-silver loaded water-based antibacterial coating, and a preparation method of coating. The nano-silver loaded graphene antibacterial agent is prepared from the following components: graphene oxide, silver nitrate, polyvinylpyrrolidone and sodium borohydride. The graphene in-situ reduction nano-silver loaded water-based antibacterial coating o is prepared from the following raw materials in parts by weight: 25-35 parts of water, 30-40 parts of acrylic resin, 20-30 parts of polyurethane resin, 2-3 parts of the nano-silver loaded graphene antibacterial agent, 1.5-2.5 parts of a dispersant, 1-1.5 parts of a curing agent, 0.8-1 part of a defoamer, 0.5-0.8 part of film formation aid and 0.5-0.8 part of levelling agent. Under the combined action of graphene and nano-silver, the antibacterial efficiency, the antibacterial time and the antibacterial property of the coating can be greatlyimproved; the coating is excellent in antibacterial effect, long in antibacterial time, free of toxicity, free of pollution, high in water resistance and weather resistance, and high in adhesion; thenano-silver is loaded in graphene in situ, is incapable of settling, and can be uniformly dispersed in emulsion.

The invention discloses a platinum nano-material with the activity of four mimic enzymes and a preparation method thereof. The preparation method comprises the following steps: using citrate ions as a modifier, reducing chloroplatinic acid by utilizing sodium borohydride, and preparing the platinum nano-material modified by citric acid. The platinum nano-material is simply and quickly prepared, the particle size is small, and the dispersibility and stability of a water solution are high. The obtained platinum nano-material has the activity of four mimic enzymes at the same time, and comprises peroxidase, oxidase, catalase and superoxide dismutase. The activity of the four mimic enzymes of the platinum nano-material can be adjusted and controlled through the concentration of the citrate ions used in the preparation process.

The invention relates to a method for preparing graphene, a method for carrying out graphene surface modification by taking one or more than two of pyrene, pyrene derivatives, naphthalene and naphthalene derivatives as a modifying agent as well as a method for manufacturing TiO2-graphene nano-composite material by utilizing the reaction of the surface-modified graphene and a titanium-containing compound and a product thereof. The method for preparing graphene comprises the steps of (a1) reducing dispersive graphite oxide in inert solvent by using a reducing agent to form a graphene-containing reaction mixture, wherein the reducing agent comprises sodium borohydride, vitamin C or combination thereof; and (a2) isolating graphene from the reaction mixture. The obtained graphene is flocculent and the TiO2-graphene nano-composite material has efficient photocatalytic performance.

The invention discloses a preparation method of nanometer low-silver-content back silver conductor paste for crystalline silicon solar application. The method comprises the following steps of silver powder preparation, organic carrier preparation and nanometer silver conductor paste preparation. In silver powder preparation, a saturated silver nitrate and PVA mixed solution is added dropwise into a sodium borohydride solution, then water bath stirring is conducted, centrifugation, alcohol washing and low-temperature negative-pressure drying are conducted, and then silver powder with the grain size being 1 nm-100 nm can be obtained. According to the preparation method, the self-made nanometer silver powder is used for replacing micro-sized silver powder in existing back silver conductor paste, so that the conductive performance, the printing performance and the crystalline silicon substrate adhesion performance of the paste are changed, and application of the back silver conductor paste in crystalline silicon solar energy is greatly expanded; in addition, according to the method, the adding amount of the silver powder is greatly reduced, existing paste production equipment is used in the preparation process, extra new investment is not needed, environment protection is facilitated, and use of the precious metal silver is reduced.

The invention belongs to the technical field of medicament synthesis, and in particular relates to a chemical synthetic method of hydroxytyrosol. The chemical synthetic method comprises the steps of (1) protecting two phenolic hydroxyl groups of catechol by using dichloromethane, and enabling catechol to react with dichloromethane to prepare 1,2-methylenedioxybenzene; (2) enabling 1,2-methylenedioxybenzene to react with various monoesters of oxalyl chloride to prepare 3,4-methylenedioxy phenylglyoxylic acid ester; (3) preparing 3,4-methylenedioxy phenylacetic acid by using 3,4-methylenedioxy phenylglyoxylic acid ester through a Wollff-kishner-Huang Minglong reduction reaction; and (4) reducing the 3,4-methylenedioxy phenylacetic acid by using lithium aluminum hydride, lithium borohydride or sodium borohydride to prepare 3,4-methylenedioxy phenethyl alcohol, and then removing methylene protection of the 3,4-methylenedioxy phenethyl alcohol by using boron tribromide or palladium on activated carbon to prepare hydroxytyrosol. A reactive reagent used in the synthetic method disclosed by the invention is easy to obtain and low in price, the reaction condition is mild, and the final yield of the whole reaction is 23%.

The invention provides a preparation method of a carbon sphere loaded nanoscale zero valent iron composite material. The method comprises: (1) preparing carbon spheres containing hydrophilic functional groups (-OH, -COOH) by a hydrothermal method; (2) chelating iron ions and the functional groups by soaking; (3) finally, dropping potassium borohydride or sodium borohydride solution into carbon sphere mixed solution with the iron ions, and forming the carbon sphere loaded nanoscale zero valent iron composite material by a strong reducing effect. The material prepared by the preparation method provided by the invention not only simultaneously has an adsorption effect of the carbon spheres and the strong reducing effect of nanoscale zero valent iron, but also can form a micro primary cell between the iron and carbon; not only are the problems of clustering and the like of nanoscale zero valent iron particles solved, but also electron transfer is reinforced and a degrading effect on polluted waste water is promoted; the method provided by the invention is low in cost and simple to operate, and the nano particles have high dispersity and stability.

Provided is preparation of a water-soluble luminous silver nano cluster with double-stranded DNA as a template. Firstly, single-stranded DNA rich in cytosine base group is used, 6 cytosine base group loops are reserved in the single-stranded DNA, the total number of the cytosine base groups is 29, single-stranded DNA rich in guanine base group complements the single-stranded DNA and is added, the total number of the guanine base groups is 23, the double-stranded DNA with the 6 cytosine base group loops is formed through the annealing function and is used as the template, and synthesis is achieved through the method of adding sodium borohydride to restore silver nitrate. The preparation process is simple, easy to implement and environmentally friendly, and the preparation can be applied to the preparation of other luminous nano materials. In addition, new nano materials synthesized through the method have water solubility, a high quantum yield, light stability, good biocompatibility and other performance, and have potential wide application to the fields of biosensors, cell imaging, clinical medicine and the like.

A hydrothermal preparation method of a water-soluble ZnCdSe ternary quantum dot belongs to the nano technical field; the invention chooses zinc chloride or zinc Oxide as zinc source, sodium hydrogen selenide formed by selenium powder and sodium borohydride as selenium source, glutathione as stabilizer, leading the ZnSe precursor solution to be prepared under the protection of the nitrogen. The ZnSe precursor solution reacts in the hydrothermal environment to obtain the ZnSe quantum dot. The cadmium chloride or the cadmium Oxide chosen as cadmium source, and the glutathione chosen as the stabilizer are mixed together with the prepared ZnSe quantum dot to obtain the ZnCdSe precursor solution. The water-soluble ZnCdSe quantum dot is obtained by leading the ZnCdSe precursor solution to react in the hydrothermal environment. Due to the mild reaction condition, convenient operation and the simple equipment, the invention leads the water-soluble ZnCdSe quantum dot to be suitable for the industrial production with the better dispersion, better uniformity of the particle size and high fluorescent quantum efficiency. .

The invention discloses stereospecific synthesis of beta-artemether by using artemisinin as a raw material through a one-pot method, which comprises the following steps of: in a system of alkaline solution of dichloromethane, taking sodium borohydride as a reducing agent and aluminium tert-butoxide as a catalyst, and reducing to obtain dihydroartemisinin; and separating out a water phase, adding methanol, sodium acid sulfate, aluminum perchlorate nonahydrate, nickelousperchlorate and the like serving as catalysts for methyl etherification, and reacting at room temperature for 2 hours to obtain the beta-artemether, wherein the maximum yield rate of the beta-artemether is 85 percent and the maximum total yield rate of artemether is 93.5 percent. The method has the characteristics of low cost, high yield, short time and simple and safe operation, and is completely suitable for industrial production.