4898 results about "Ammonium bromide" patented technology

The invention discloses a preparation method of a graphene-carbon nanotube compound film based on a three-dimensional network appearance. The method comprises the step of: transferring and stamping graphene and a carbon nanotube onto glass, a tantalum sheet, a silicon chip, a stainless steel plate or a polyethylene glycol terephthalate substrate in the mass ratio (1-10):1 through spraying deposition or vacuum suction filtration, wherein the grapheme is graphene oxide prepared by using an improved Hummers method; and a preparation method of a carbon nanotube solution comprises the following steps of: mixing acids; dispersing surfactants such as sodium lauryl sulfate, sodium dodecyl benzene sulfonate and hexadecyl trimethyl ammonium bromide in an auxiliary way, and the like. The graphene-carbon nanotube compound film prepared by adopting the method has the advantages of adjustable transmission and surface resistance, high uniformity, high stability, simple preparation method process and the like, and can be loaded on a rigid substrate as well as a flexible substrate.

The invention relates to a preparation method of a hollow mesoporous silica nanoparticle. The preparation method comprises the following steps: obtaining a polymer-silica composite nanoparticle having a core-shell structure by adopting spherical aggregations of an amphiphilic segmented copolymer in an aqueous solution and a cationic surfactant hexadecyl trimethyl ammonium bromide as double templates and ethyl orthosilicate as a silicon source and by hydrolyzing the silicon source under an alkaline condition; and calcining to remove the templates to obtain the hollow mesoporous silica nanoparticle. The preparation method has the advantages of simplicity, mild reaction condition, and cheap experiment raw materials, and the prepared mesoporous silica nanoparticle has the advantages of high specific surface area, high pore volume, and good biological compatibility. The hollow structure enables the drug loading amount to be substantially improved, nanometer gold, nanometer silver, magnetic iron oxide particles, quantum dots, a contrast agent and the like to be loaded, so the hollow mesoporous silica nanoparticle can be used as a targeting drug release carrier, can be used for magnetic resonance image analysis, and has good application prospects in the fields of the diagnosis and the treatment of cancers.

The invention discloses a preparation method of an alumina carrier with a composite pore structure, which comprises the steps of mixing and roasting an aluminum-contained compound and a composite template, wherein the composite template comprises a mesoporous template selected from at least one of a polyethylene glycol-polypropylene glycol-polyethylene glycol triblock polymer, polyethylene glycol, dodecylamine, hexadecyl trimethyl ammonium bromide, lauric acid, stearic acid and fatty alcohol polyoxyethylene ether and a macroporous particulate template selected from polystyrene microspheres with the particle size of greater than 50nm, polymethyl methacrylate microspheres, biomaterial particles, asphalt particles or heavy oil residues; and the weight ratio of the mesoporous template to the macroporous particulate template to the aluminum-contained compound (by alumina) is 0.1-2:0.1-0.7:1. The invention also discloses the alumina carrier simultaneously having mesoporous tunnels and macroporous tunnels prepared through the method, wherein mesopores account for 40-90% of the total pore volume, and macropores account for 10-60% of the total pore volume.

A superparamagnetism mesoporous silicon dioxide composite ball of the present invention and manufacture method thereof belong to nucleocapsid type technology field of magnetic nano particle. The shape of the composite ball is global; inner core being made of magnetic ferrite nano particle cluster, shell coating layer being made of mesoporous silicon dioxide; quality ratio of magnetic ferrite nano particle in particulate being 40-80%. Method of manufacturing has that producing magnetic ferrite nano particle is by using coprecipitation method; executing surface modification by adding oleic acid stirring; ultrasonic forming oil-in-water emulsion in the mix solution of ethyl orthosilicate and cyclohexane, cetyl trimethyl ammonium bromide as surfactant; ethyl orthosilicate hydrolytic condensation forming mesoporous silicon dioxide coating layer by adding ammonia spirit; finally taking off molding plate and getting products. Product of the invention has bigger specific surface area and stronger magnetic separation capacity, and has good dispersancy in water, and is further functionalization after being decorated at surface. The method of the present invention has simple process, and lower equipment requirement.

The invention discloses a hollow mesoporous silica microsphere with hollow core and adjustable mesopore and penetrating through a shell, preparation method and application thereof. The hollow mesoporous silica microsphere is obtained by the following steps: under the condition of acid or alkaline solution, taking hexadecyl trimethyl ammonium bromide or PEO-PPO-PEO triblock copolymer as template, adding non-polar solvent, stirring at a certain temperature, emulsifying, then adding silica source, after hydrolysis and condensation, filtering, drying, and roasting to remove the template. The preparation method has simple technique and short time, easy operation and low cost, the prepared microsphere comprises both macropore and mesopore structures, the mesopore penetrates through the shell, the aperture thereof is larger than 5nm and is adjustable within the range of 5-20nm, and by relatively large mesopore channel, internal and external transmissions of large guest molecules can be realized. The microsphere can be used as drug carrier, the drug loading amount can exceed 50% (mass percentage), and the drug release can be controlled by adjusting aperture of the mesopore and dissolutionrate of indissolvable drug can be improved.

The invention provides a method for preparing biological flocculant by utilizing Bacillus licheniformis, which relates to a biological flocculant. The invention provides a method for preparing biological flocculant by utilizing Bacillus licheniformis, which has high flocculation activity, low cost for raw materials and great industrial application potential. A microorganism is Bacillus licheniformis. The method comprises the following steps that: lawn on a fresh inclined plane is transferred to a seed culture medium for culture and then transferred to a fermentation culture medium for culture so as to obtain biological-flocculant fermentation broth; the biological-flocculant fermentation broth is centrifuged to remove precipitate and collect supernatant; the supernatant is added with ethanol, kept to stand, centrifuged and then removed; the precipitate is added with absolute ethanol, stirred and centrifuged to remove the supernatant; ethanol precipitate is added with hexadecyl trimethyl ammonium bromide and centrifuged to remove the supernatant so as to obtain the precipitate; the precipitate is dissolved in a NaCl solution, added with the absolute ethanol, stirred, stood and centrifuged to remove the supernatant so as to obtain the precipitate; and the precipitate is frozen and dried in vacuum so as to obtain pure biological flocculant.

The invention relates to a preparation method of a few-layer MoS2/graphene electrochemical storage lithium composite electrode. The preparation method comprises the following steps of: ultrasonically dispersing graphene oxide in de-ionized water; adding octaalkyl trimethyl ammonium bromide cationic surfactant, then adding ammonium thiomolybdate and dropwise adding hydrazine hydrate with stirring; performing reflow reaction at 95 DEG C to reduce the ammonium thiomolybdate and graphene oxide into MoS2 and graphene at the same time respectively; centrifugally collecting a solid product; washing with de-ionized water; drying; thermally treating in a nitrogen/hydrogen mixed atmosphere to obtain the few-layer (two to four layers) MoS2/graphene composite nanomaterial; mixing the few-layer MoS2 and graphene composite nanomaterial and acetylene black as well as polyvinylidene fluoride into paste; and coating on a copper foil for rolling. The method provided by the invention has a simple process, and an organic solvent is not consumed. The few-layer MoS2/graphene composite material is used as the electrochemical storage lithium composite electrode and has high electrochemical storage lithium specific capacity, superior circulation performance and superior high-power charging and discharging characteristic.

The invention provides a preparation method of a MoS2/Fe3O4 nano composite material, belonging to the technical field of preparation of nano inorganic functional materials. The preparation method taking Fe3O4 nano particles as the raw material comprises the following specific steps of: dispersing the Fe3O4 nano particles in de-ionized water, adding sodium molybdate, sodium chloride, sodium thiocyanate and a surface active agent CTAB (Cetyltrimethyl Ammonium Bromide), after stirring for a period of time, adjusting pH by using hydrochloric acid, then, pouring the mixture into a stainless steel reaction kettle with a polytetrafluoroethylene liner, and naturally cooling after reacting at the pre-set temperature for a period of time; and centrifugally washing a reaction product by using the de-ionized water for several times, and drying the product to obtain the MoS2/Fe3O4 nano composite material. The method disclosed by the invention has the advantages of being simple in process, rapid, high-efficiency and the like; MoS2 is well wrapped on the Fe3O4 nano particles; and the MoS2/Fe3O4 nano composite material prepared by the invention is good in crystallinity, controllable in morphology and size and good in adsorption property.

The invention discloses bismuth vanadate powder and a preparation method thereof. The method comprises the following steps: firstly, bismuth-bearing compounds and vanadium-bearing compounds are respectively dissolved in a nitric acid, mixed and then added with a hexadecyl trimethyl ammonium bromide solution, the mol ratio of bismuth to vanadium to the nitric acid to hexadecyl trimethyl ammonium bromide is 1 to 1 to 2.5 to 0.025, and the mixture is stirred for 1 to 2 hours by magnetic force so as to form a bismuth vanadate precursor; the bismuth vanadate precursor is placed in a reaction kettle, undergoes hydrothermal treatment for 70 to 75 hours at a temperature of between 80 and 200 DEG C, cooled, centrifugally separated, and then added with a saturated sodium chloride solution of anhydrous ethanol and deionized water; ion-exchange is performed after the bismuth vanadate precursor is completely immersed, and then centrifugal separation is performed; and finally the bismuth vanadate precursor is washed for 3 to 5 times by mixture of the deionized water and ethanol, then the bismuth vanadate powder with microspheric and/or micro-flaky particles is prepared. The method has simple operation and mild conditions; and bismuth vanadate powder particles prepared are uniform, have large specific surface area, have the characteristics of good visible light response and high photocatalytic activity, and are suitable for industrialized production.

The invention relates to a platinum-induced aurum core/ palladium platinum island-shaped alloy shell structure nanorod solution and a preparation method. The structure consists of a cylindrical aurum nanorod inner core and an island-shaped porous palladium platinum alloy shell coated on the outer surface of the inner core. The preparation method comprises the following steps of: firstly preparing aurum crystal seed solution; secondly, preparing aurum nanorod solution and purifying the aurum nanorod solution; thirdly, mixing the purified aurum nanorod solution, chloropalladate solution and potassium tetrachloroplatinate solution and uniformly shaking the mixture, and adding ascorbic acid water solution into the mixture to obtain mixed solution; and placing the mixed solution in constant-temperature water bath for reaction and then adding hexadecyl trimethyl ammonium bromide water solution into the mixed solution and finally performing the centrifugal separation on the mixed solution to obtain platinum-induced aurum core/ palladium platinum island-shaped alloy shell structure nanorod solution. The solution has the advantages of high catalyzing capability, high catalyzing efficiency and high CO poisoning resistance for electrocatalysis oxidation of formic acid, low costs and the like, and is used for directly preparing a formic acid fuel cell catalyst. In addition, the method is simple, low-energy, environmentally-friendly and high-efficiency.

The invention discloses a method for preparing tetrapropyl ammonium hydroxide by utilizing bipolar membrane electrodialysis, and the method comprises the following steps of: using a tetrapropyl ammonium bromide aqueous solution as a raw material, processing the tetrapropyl quaternary ammonium salt aqueous solution through a microporous filter, and then enabling the processed tetrapropyl quaternary ammonium salt aqueous solution to enter a material liquid room of a bipolar membrane electrodialyzing device, respectively adding water in an acid room and an alkali room, respectively adding a sodium sulfate solution in pole liquid rooms, controlling the current density, the voltage and the temperature of the bipolar membrane electrodialyzing device to be 150-600 A/M2, 20-300 V and 5-45DEG C respectively, carrying out circulating cooling through chilled saline water in a circulating coil pipe by using an electrodialyzing compartment in a running process, stopping running when the conductivity of the material liquid room is decreased to below 2000 [mu]s/cm, obtaining a tetrapropylammonium hydroxide solution in the alkali room, and recycling a hydrobromic acid solution in the acid room. By using the method, the raw material cost is low; the selectivity is multiple; the purity of the tetrapropyl ammonium hydroxide is high; hydrobromic acid further can be recovered; and the generation of a pollutant in the process is effectively avoided.

The invention relates to a catalytic material of a composite molecular sieve containing micropore Y-zeolite phase and mediated hole MCM- 48 phase, which is produced by taking mixed cationic and non-ion surfactant as template; the invention also relates to a preparation method of the catalytic material. By adopting a method of overgrowth and employing mixed aqueous solution of cationic surfactant: cetylíítrimethyl ammonium bromide(CTAB) and nonionic surfactant: p -octyl polyethylene phenyl ether OP-10 as template, under the alkaline hydrothermal condition the invention synthesizes composite molecular sieve which is provided with Y/MCM-48 with micropore and two-mode mediated holes. The framework ratio Si/Al of microporous phase Y-zeolite of the composite molecular sieve is higher than traditional Y-zeolite, and the ratio Si/Al and the content of the framework of microporous phase can be adjusted by changing synthesis conditions. The method of the invention has simple operation and good repeatability, which provides with optional materials for developing novel catalyst with industrial application prospect, and the synthesis has practical application value.

The invention relates to a method for preparing a hollow mesoporous silicon dioxide ball with continuously-changing cavity diameter, which is characterized by specifically comprising the following steps: (1) dissolving 0.05 to 2 g of hexadecyl trimethyl ammonium bromide into 12 to 70 ml of ethanol to be stirred for 10 minutes to be dissolved fully, and adding 0.5 to 9 ml of ethyl orthosilicate for stirring fully; (2) preparing 0.01 to 0.4M of ammonia solution; (3) stirring the ammonia solution at a high speed, adding the mixed solution prepared in the step (1) into the ammonia solution quickly; stopping stirring after five minutes; and generating white floccule floating on the surface of the liquid, wherein the volume ratio of the mixed solution to the ammonia solution is 1:5-1:20; and (4) heating up the filtered white precipitate to 600 DEG C at a speed of 2 DEG C/min, and keeping the temperature for 1 hour to obtain the hollow mesoporous silicon dioxide ball.

The invention relates to a preparation method of antimicrobial, and aims at providing a preparation method of mesoporous hollow spherical silver-loaded silicon dioxide antimicrobial, which comprises the following steps that polystyrene microspheres are added into mixed solution of ethanol with dissolved hexadecyl trimethyl ammonium bromide and de-ionized water to be uniformly mixed, then ammonia is added, ethyl orthosilicate is gradually dropped, the obtained solution is filtered, washed and dried to obtain compound powder with polystyrene being wrapped by silicon dioxide microspheres; the powder is subjected to heat preservation at the temperature of 550 DEG C to obtain hollow silicon dioxide microspheres; and under a light-resistant condition, the hollow silicon dioxide microspheres are soaked inside silver nitrate solution, and then the solution is filtered, dried and heated to the temperature of 300 to 500 DEG C so as to obtain the mesoporous hollow spherical silver-loaded silicon dioxide antimicrobial. The dispersivity and the stability of silver particles are improved, so that the agglomeration problem of traditional nano antimicrobial powder can be effectively solved. Meanwhile, the antimicrobial can be slowly released through mesoporous, the releasing of silver particles can be effectively maintained for a long time so as to realize the lasting antibacterial effect.

The invention relates to an inorganic porous material synthesis technology field, and concretely relates to a method for preparing hollow mesoporous lamella spherical silica material. In a mixed solvent of alcohol and water, under the catalytic action of ammonia, using a cationic surface active agent of cetyl trimethyl ammonium bromide as a mesoporous template, the inorganic silicon material self-assembles to be mesoporous uniform spheres on the polyphenylacetylene sphere surface, the surface active agent and the polyphenylacetylene sphere are deprived in high temperature environment, the hollow silica spheres with uniform size from micron to millimeter and mesoporous lamella are obtained. The specific surface area of the obtained hollow silica sphere is 800-2000m<2>/g, the bore diameter is 1.8-3.5nm, and the bore volume is 0.5-0.8 ml/g.

The invention discloses a method for preparing gold nano-rods. The method includes the steps: adding chloroauric acid solution and optional gold seed generating regulating agents into CTAB (cetyl trimethyl ammonium bromide) solution, adding silver nitrate solution, weak reducing agents and strong reducing agents into the CTAB solution and reacting at the constant temperature of 25-40 DEG C for 5-30min to obtain reaction liquid A; and adding silver nitrate solution, optional gold nano-rod growth regulating agent solution and water into the reaction liquid A to obtain reaction liquid B, and continuing reaction to obtain the gold nano-rods. The method is simple in process and operation and fine in reproducibility, the diameter of coverage of the prepared gold nano-rods is as small as 5nm to tens of nanometers, LSPR (localized surface plasmon resonance) peak value coverage in the length direction ranges from 630nm to 1010nm, counts in a TEM (transmission electron microscopy) graph indicate that more than 90% of rod products among obtained gold nano-particle products are high in rod yield, and the ratio of an LSPR peak value to a TSPR (transverse surface plasmon resonance) peak value is not lower than 2 in a UV-Vis (ultraviolet visible) absorption spectrogram. Raw materials used in the method are widely and easily obtained, and production cost is low.

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 metal-organic framework materials with magnetic cores and preparation and application thereof, and belongs to the technical field of magnetic metal-organic framework materials. FeCl3 6H2O is adopted for preparing superparamagnetic Fe3O4 cores, cetyl trimethyl ammonium bromide is used as a template agent, sodium silicate is used as silicon sources of SiO2 shell layers, mesoporous SiO2 shell layers are formed on the surfaces of the Fe3O4 cores by adopting an ultrasonic wave method, the template agent is removed by roasting under protection of N2 after drying, and magnetic SiO2@Fe3O4 nanospheres are prepared. The SiO2@Fe3O4 nanospheres are used as cores, an in-situ self-assembly mesh structure IRMOFs is carried out on the surfaces of the SiO2@Fe3O4 cores through Zn metal ions and organic carboxylic acid ligands by adopting the ultrasonic wave method. The novel MOFs materials can be used as catalysts of liquid phase catalysis reaction, and also have application values in the aspects of adsorption, separation, biological medicine and the like.

The invention relates to calcium carbonate filler, and specifically relates to wear-resistant surface modified calcium carbonate filler. The modified calcium carbonate filler is prepared from the following raw materials in parts by weight: 200 parts of calcium carbonate powder, 1-2 parts of iron-ore slag powder, 4-5 parts of polytetrafluoroethylene, 1-2 parts of graphene, 1-2 parts of hexadecyl trimethyl ammonium bromide, 1-2 parts of polyacrylamide, 1-2 parts of titanium dioxide, 2-3 parts of dimethyl disulfydryl stannum isooctyl acetate, 2-3 parts of sodium lignin sulfonate, 2-3 parts of hydroxyl silicone oil and 4-5 parts of an assistant. According to the modified calcium carbonate powder provided by the invention, calcium carbonate is modified by adopting various surfactants such as hexadecyl trimethyl ammonium bromide, polyacrylamide, sodium lignin sulfonate and hydroxyl silicone oil. The performance indexes of the modified calcium carbonate powder such as oil factor, viscosity and activating rate are improved, and the modified calcium carbonate powder is easier to disperse and compatibilize in a macromolecular polymer. When the modified calcium carbonate powder is used to fill a PVC (Polyvinyl Chloride) material, the reinforcing effect of the modified calcium carbonate is more excellent than unmodified calcium carbonate.

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 relates to a filter additive material for selectively reducing the hydrocyanic acid emission amount in the mainstream smoke of cigarettes and a preparation method thereof. The filter additive material for selectively reducing the hydrocyanic acid emission amount in the mainstream smoke of cigarettes is characterized in that the filter additive material is a novel material that can effectively absorb acidic gas and is obtained by chemically modifying a porous material and introducing different alkali groups. The preparation method of the filter additive material comprises the following steps: respectively carrying out surface chemical modification on the selected porous carrier material with trimethylamine chloride acethydrazide or (2-bromomethyl)trimethyl ammonium bromide, soaking with sodium hydroxide solution, washing with water and drying to obtain the modified porous material containing ammonium hydroxide group. Adding the material in a cigarette filter rod can reducethe hydrocyanic acid content in the mainstream smoke of cigarette by more than 30%, and no negative influence is caused on the taste quality of cigarette, thus achieving the purpose of selectively reducing harm.