38results about How to "Control particle size" patented technology

The invention relates to a porous carbon / manganese dioxide composite electrode, a preparation method of the porous carbon / manganese dioxide composite electrode and a rechargeable zinc-manganese ion battery, and belongs to the technical field of electrochemistry. Porous carbon with high specific surface area and favorable electric conductivity is taken as a carrier electrode; the carrier electrode is electrolyzed in flowing water solution which contains a manganous salt precursor and a supporting electrolyte; and manganese dioxide is deposited on the surface of the porous carbon. Through selecting the concentration of the manganous salt as well as the concentration, pH value, current, temperature and time of the supporting electrolyte in the electric deposition process, a porous carbon / manganese dioxide composite is prepared, so that the regulation and control of the particle size and distribution density of the manganese dioxide are realized, and the active substance utilization rate of the manganese dioxide is improved. By taking the obtained porous carbon / manganese dioxide composite as the electrode, and by using the water solution containing zinc and manganese ions as electrolyte to assemble secondary batteries, the specific capacity of the electrode is above 200mAh / g and the electrode has the characteristics of being high in capacity and long in service life. The preparation method is easy to operate, green and environmental.

The invention discloses a rare earth doped glass frequency conversion luminous material and a preparation method thereof. The luminous material is formed by fluoride glass ceramics containing rare earth ions and silver nanoparticles. The preparation method comprises the steps of firstly preparing glass containing rare earth ions, secondly preparing the glass into the glass ceramics containing fluoride crystals through the heat treatment technology, and thirdly soaking the glass ceramics in a mixed salt melt containing silver nitrate to undergo ion exchange, thus obtaining the rare earth doped frequency conversion luminous material jointly enhanced by the silver nanoparticles and fluoride microcrystals. The obtained luminous material has the beneficial effects that the luminous material has good optical property and thermal stability; through irradiation of exciting light, by utilizing the local field enhancement effect of the silver nanoparticles, the rare earth ions in a low phonon energy environment created by the fluoride microcrystals achieve high frequency conversion luminous efficiency which can be maximally enhanced by 30 times, thus effectively making up for the problem of low rare earth ion doped glass frequency conversion luminous efficiency.

The invention belongs to an inorganic mesoporous material area, in particular to a preparation method of a controllable silica hollow sphere material in a certain diameter range. The anionic surfactant sodium dodecyl sulfonate (SDS) controls the synthesis of spherical wall, which is provided with mesoporous channels and narrow distribution of diameter. The invention uses block copolymer and sodium dodecyl sulfonate as mixing template; with the addition of silicon source, the sol is formed after mixing; under the acid condition, through the agitating and aging treatment, after hydrothermal process, filtering and drying, the template is calcined to obtain silica hollow sphere with the mesoporous channel. Through changing the content of SDS, the synthesis of different size of silica hollow spheres with the mesoporous channel can be controlled. The invention has a simple process and a low cost; the mesoporous shell thickness and the pore diameter of the prepared silica hollow sphere with the mesoporous channel can be controlled in a large range; the invention is beneficial to the internal and external transmission of guest molecules; the invention also improves the reserves of guest molecules, which realizes the controlled release effectively.

The invention discloses a method for preparing a nanocrystal lithium iron phosphate anode material through co-precipitation, which comprises the following steps of: 1, mixing crude materials, and stirring at high speed to obtain a precursor solution; 2, standing the precursor solution, cleaning, filtering and drying to obtain precursor powder; 3, adding an organic carbon source into the precursor powder and uniformly blending, and drying obtain the precursor powder which is coated by the organic carbon source; 4, roasting and cooling to obtain the organic carbon-coated nanocrystal lithium iron phosphate anode material; 5, mixing an inorganic carbon source with an anode material, adding adhesive and uniformly stirring to obtain an anode sizing agent; and 6, coating the anode sizing agent onto an aluminum foil substrate, drying and pressing to obtain a carbon-coated nanocrystal lithium iron phosphate anode material. With the adaption of the carbon-coated nanocrystal lithium iron phosphate anode material prepared by the method disclosed by the invention, assembled button half-cells have excellent chemical properties. The first discharge capacity achieves 155 mAh / g to 165 mAh / g at 0.1C; and a discharge platform is flat and about 3.4 V.

The invention provides a non-ionic compound gas hydrate anti-agglomerant which consists of an alkyl polyglycoside non-ionic surfactant and a polyhydric alcohol non-ionic surfactant in a weight ratio of (0.01-100):1. The gas hydrate anti-agglomerant is used for anti-agglomerating treatment of an oil-gas-water three phase mixed conveying system, wherein the volume of water accounts for less than or equal to 60% of the total volume of oil and water. The invention further provides an anti-agglomerating method adopting the non-ionic compound gas hydrate anti-agglomerant. The method comprises the step of adding the non-ionic compound gas hydrate anti-agglomerant into the oil-gas-water three phase mixed conveying system. The non-ionic compound gas hydrate anti-agglomerant provided by the invention is suitable for oil-gas-water three phase co-existing systems and is less in use level, good in biodegradability, economic and environmental friendly and remarkable in anti-agglomerating effect.

The invention belongs to the technical field of carbon material chemistry. The invention discloses a superfine M-N-C non-noble metal carbon-based oxygen reduction catalyst, and a preparation method and application thereof. Transition metal basic acetate, N-heterocyclic or carboxylic acid organic ligands are adopted as reactants, a certain amount of solvent and regulator are added, reaction is performed at a certain temperature to obtain a superfine metal-organic framework material, and the superfine non-noble metal carbon-based catalyst is obtained through a one-step carbonization process. Thesuperfine non-noble metal carbon-based catalyst is used as a catalyst for hydrogen fuel cathode oxygen reduction reaction, excellent catalytic activity is obtained, and the activity of the catalyst is superior to that of a commercial platinum-carbon catalyst; and in addition, the stability and methanol poisoning resistance of the catalyst in the oxygen reduction reaction are superior to those ofan existing platinum-carbon catalyst. The superfine non-noble metal carbon-based catalyst can be applied to the fields of hydrogen fuel cells, metal-air batteries and the like.

The invention discloses a method for preparing black titanium dioxide by using a hydrothermal synthesis method. The method comprises the following specific steps: (1) adding sodium peroxide or potassium peroxide into titanium hydride or titanium nitride powder, mixing the materials uniformly, adding water, and stirring the materials uniformly; (2) soaking the polytetrafluoroethylene lining of a reaction kettle into aqua regia at the room temperature for 1 hour, boiling the polytetrafluoroethylene lining with distilled water for three times, putting a powder mixed solution prepared in the step (1) into the polytetrafluoroethylene lining, putting the polytetrafluoroethylene lining into a matched steel casing, and tightening the steel casing; (3) putting the reaction kettle into a constant-temperature reactor, and reacting at the temperature of 150-250 DEG C for 3-7 hours; (4) after the reaction, centrifuging a product obtained in the step (3), discarding supernatant, taking precipitate out, and washing the precipitate with deionized water; and (5) drying the precipitate obtained in the step (4) to obtain the black titanium dioxide powder.

The invention discloses a triple-hybrid yolk-shell structured mesoporous organic silica and a preparation method thereof. A framework of the silica comprises three bridged organic silicas and is in the shape of a spheroid which has a core-shell structure; both a core and a shell layer are provided with mesoporous channels, and a cavity structure is provided between the core and the shell layer. The preparation method includes: dissolving a surfactant in a mixed solution of ammonia-containing ethyl alcohol and water, and adding tetraethyl orthosilicate and three bridged organic silica precursors under heating and stirring; after a period of time of reaction, subjecting obtained solid organic silica to hydrothermal treatment to form a yolk-shell structure, and finally removing the surfactant to obtain triple-hybrid yolk-shell structured mesoporous organic silica nanospheres. The preparation method has a simple technical process, and products prepared have great potential of application in the fields of drug delivery, environmental treatment and the like.

The invention relates to the technical field of microorganism fermentation, in particular to a method for preparing spherical bacterial cellulose. The method for preparing the spherical bacterial cellulose comprises the following steps of: putting activated strains into a seed culture medium to carry out shaking culture by using a shaker so as to obtain seed solution; and filling the cultured seed solution into a fermentation medium and performing dynamic culture for 3 to 10 days to obtain the evengrained spherical bacterial cellulose. The method for preparing the spherical bacterial cellulose effectively reduces energy consumption in the culturing process by adopting the dynamic culture mode, can realize the regulation and control of the particle size of particles, can meet the requirements of the spherical bacterial cellulose applied in the fields of food processing, medicament sustained release, biomarker and the like, accords with the using requirement in the fields of food processing and biomedicine, has the characteristics of simple and easy process, convenience of operation, no pollution, low cost and the like and provides an effective approach for the industrial productionof the spherical bacterial cellulose.

The invention relates to the field of a catalyst used in synthesis of dimethyl dichlorosilane, in particular to a ternary copper catalyst used in synthesis of the dimethyl dichlorosilane and a preparation method of the ternary copper catalyst. The preparation method according to the invention comprises the following steps of: (1) dissolving a copper salt into a mixed solvent of polybasic alcohol and water to obtain solution with copper ion concentration of 0.0025-0.25 g / mL; and (2) dropwise adding pH regulator aqueous solution into the solution obtained by the step (1) under a stirring condition, transferring the solution into a reaction kettle after the pH value of the solution is 6-13, reacting at 100-250 DEG C for 2-30 hours to obtain brown precipitate, and washing and drying the precipitate to obtain the ternary copper catalyst. The ternary copper catalyst prepared by the invention has the advantages of simple experimental process route, convenience in operation, entire process performed in the reaction kettle, no need of any complex experimental equipment, high reaction speed, easiness for large-scale production and capability of showing higher selectivity for the dimethyl dichlorosilane and higher conversion rate for a silicon powder raw material.

The invention relates to a large-pore-size mesoporous carbon / silicon dioxide loaded gold nano-catalyst and a synthesis method thereof. The catalyst has a face-centered cubic ordered structure, the specific surface area is 200m<2> / g to 700<2> / g, the pore volume is 0.30cm<3> / g to 0.60cm<3> / g, the pore size is 7.0nm to 20nm, and the mass percent of Au is 0.5% to 2.5%. During preparation, the mesoporous carbon / silicon dioxide loaded gold nano-catalyst is synthesized in one step through mixing a macromolecular surfactant, which serves as a template agent, with a gold source, a carbon source and a silicon source and carrying out solvent-induced volatilization self-assembly. Compared with the prior art, the catalyst provided by the invention has the characteristics of high-ordered mesoscopic structure, adjustable pore size (7.0nm to 20nm), relatively small gold nano particle size (3nm to 5nm), adjustable gold content (0.5wt% to 2.5wt%), and the synthesis method is simple, is low in cost and facilitates the implementation of large-scale production, thereby having very good economic application prospect.

The invention belongs to the technical field of photo-thermal conversion, and particularly relates to a copper-based composite material, a preparation method and application of the copper-based composite material in the field of photo-thermal conversion. The copper-based composite material is a photo-thermal composite material formed by wrapping copper selenide nano ellipsoids with polydopamine, and the thickness of the polydopamine in the copper-based composite material is 5-80 nm. The copper selenide nano ellipsoid serves as a semiconductor material, has a surface plasma resonance effect, and can effectively absorb infrared light and convert light energy into heat energy under the condition of infrared laser irradiation, so that the temperature of the material is increased; the surface of the copper selenide nano ellipsoid is coated with the polydopamine, so that the copper-based composite material is black under the condition of natural light and can efficiently absorb light in the visible light and near-infrared light range, namely, the polydopamine can make up for low light absorption of the copper selenide nano ellipsoid in the visible light range. The composite material can reach a temperature higher than that of the copper selenide nano ellipsoid under the same condition, namely, the composite material has higher photothermal conversion efficiency.

The invention discloses an intermediate infrared luminescent material for rare earth ion doped glass ceramics and a preparation method of the intermediate infrared luminescent material. The intermediate infrared luminescent material is prepared from bismuth tellurite glass ceramics containing rare earth ions Er<3+> and Bi3.20Te0.80O6.40 nanocrystalline particles, firstly, bismuth tellurite glass containing the earth ions Er3<+> is prepared, and then the glass ceramics containing Bi3.20Te0.80O6.40 nanocrystalline are prepared from the bismuth tellurite glass through a two-step heat treatment technology. The obtained glass ceramics have the good optical property, and through irradiation of exciting light, efficient 2.7 [mu]m fluorescence radiation is achieved through the rare earth ions Er<3+> in a low phonon energy environment created by the nanocrystalline.

The invention relates to a preparation method of kaolin for high-performance honeycomb ceramic, which is characterized by sequentially comprising the following steps: crushing; pulping; selectively flocculating; settling, controlling the mass concentration of the ore pulp at 12-18%, adding water glass of which the mass concentration is 7-13% and sodium hexametaphosphate, measuring the temperature and liquid level of the ore pulp in a settling basin, calculating the settling time according to a simplified empirical formula t=Tn*h / d2 based on the Stokes law (wherein d in the simplified formula represents the granule size of granules and is valued at 3), and standing at the settling time, wherein after standing, the granule size of granules of the underlayer ore pulp is more than 3 micrometers, and the granule size of granules of the supernatant ore pulp is less than 3 micrometers; and performing vacuum filtration, drying, and granulating to ensure that the mass percent of Fe2O3 contained in the kaolin product is less than or equal to 0.20%, the sum of the mass percents of contained K2O and Na2O is less than or equal to 0.4%, the content of granules of which the granularity is less than 2 micrometers is more than or equal to 91% and the bulk density is 0.30-0.36g / cm<3>. Thus, the invention satisfies application in high-performance honeycomb ceramic industry.

The invention discloses a method for preparing nickel porous materials based on a nickel oxalate and sodium chloride co-mixing reducing method, relates to a nickel porous material preparing method, and belongs to the technical field of metal porous material preparing. After nickel oxalate powder and sodium chloride powder are subjected to ball grinding and evenly mixed, reducing is conducted, thereducing temperature is 400-450 DEG C, and nickel powder and sodium chloride powder evenly-mixed powder is obtained; then, pressing is conducted at 100 MPa-200 MPa, sintering is conducted at 700-800 DEG C, and a sintered blank with certain strength is obtained; and finally, a water dissolving method is used for removing sodium chloride in the sintered blank, and the nickel porous materials are obtained. The preparing method has environment friendliness, and the prepared porous materials have the characteristics that porosity is high, hole distribution is uniform, and the hole diameter is controllable.

The invention relates to the technical field of cold ironing membranes and particularly relates to a cold ironing membrane for a hose and a production process of the cold ironing membrane. The cold ironing membrane consists of a separation layer, a color layer, an aluminum plated layer and a medium layer in an overlapped manner, in addition, the separation layer, the color layer and the medium layer are made of raw materials of specific weight percentages respectively, and the cold iron membrane can be relatively well adhered to a hose substrate and has the characteristic of environment protection; the production process of the cold ironing membrane comprises steps of preparing materials of the separation layer, the color layer and the medium layer, and performing coating and aluminum plating; the advantage of simple production process is achieved.

The invention relates to a multilevel-structure ZSM-5 zeolite-molecular sieve catalyst, a preparation method therefor and an application of the multilevel-structure ZSM-5 zeolite-molecular sieve catalyst. The preparation method comprises the steps: (1) dripping a micropore structure-directing agent solution into a mixed solution containing a silicon source, an aluminum source and water, and carrying out stirring, so as to obtain a precursor solution; (2) continuing to stir the obtained precursor solution at the temperature of 30 DEG C to 60 DEG C so as to obtain precursor gel, and then, carrying out drying and powdering, so as to obtain dried gel powder; (3) treating the obtained dried gel powder with the assistance of steam with the temperature of 100 DEG C to 180 DEG C under steam conditions for 5 to 48 hours, and then, carrying out drying and primary calcination, so as to obtain sodium-type ZSM-5 zeolite molecular sieves; and (4) subjecting the obtained sodium-type ZSM-5 zeolite molecular sieves to ion exchange and secondary calcination, thereby obtaining the multilevel-structure ZSM-5 zeolite-molecular sieve catalyst.

The invention discloses a preparation method of nano Al2O3 / Y3Al5O12 / ZrO2 composite powder materials and relates to a preparation method of nano Al2O3 / Y3Al5O12 / ZrO2 composite powder materials. The invention aims to solve the technical problem that because a large amount of organic matters are adopted, existing preparation methods of nano Al2O3 / Y3Al5O12 / ZrO2 composite powder materials are complicated in preparation process, high in cost and low in yield, the uniform dispersion of particles of each phase is difficult to achieve, and the properties such as particle size can not be regulated. The preparation method disclosed by the invention comprises the following steps: 1, preparing raw material solutions; 2, mixing the raw material solutions; 3, coprecipitating the obtained mixture; 4, centrifugalizing, washing and drying the obtained object; and 5, calcinating the obtained product. The method disclosed by the invention is applied to the preparation of nano Al2O3 / Y3Al5O12 / ZrO2 composite powder materials.

The invention discloses a method for preparing a calcium lanthanum molybdate europium-doped luminous olive sphere. The method disclosed by the invention comprises the following steps: mixing a lanthanum nitrate solution, a calcium nitrate solution and a europium nitrate solution; adding a complexing agent and sodium molybdate, stirring at a normal temperature so as to obtain a reaction precursor solution; transferring the reaction precursor solution into a hydrothermal reactor for carrying out a hydrothermal reaction; cooling, centrifuging and washing after the hydrothermal reaction is ended, thereby obtaining the calcium lanthanum molybdate europium-doped luminous olive sphere sample. The preparation method disclosed by the invention is low in reaction temperature, low in equipment requirement and simple in operation; the prepared calcium lanthanum molybdate europium-doped luminous olive sphere is regular in morphology, uniform in size and excellent in luminous property.

The invention discloses an organic-inorganic hybrid nanoparticle based on branched PEI (polyethyleneimine) and POSS (polysilsesquioxane) as well as a preparation method of the organic-inorganic hybrid nanoparticle. The organic-inorganic nanoparticle is obtained by assembling subject unit grafted hydrophilic branched PEI and object unit modified POSS through molecular recognition between subject and object units and by use of an oil / water phase interface. The preparation of the organic-inorganic hybrid nanoparticle is simple and low in cost, the condition is mild, the problem that conventional preparation methods lack cosolvents is solved, the prepared organic-inorganic hybrid nanoparticle has the characteristics of being easy to functionalize and sensitive to pH, and the particle size can be regulated through pH easily.

The invention provides a multi-section feeding type anti-solvent spraying crystallizer and a spraying crystallization method thereof. The crystallizer is a tubular crystallizer which is vertically arranged, wherein a main pipe inlet (1) is formed in the upper part of the tubular crystallizer; small holes or slits (2) which are symmetrically distributed are formed in positions with different heights of a main pipe wall from top to bottom; buffering chambers (3) are arranged around the small holes or the slits (2) in the positions with the same height; a side feeding opening (4) is formed in each buffering chamber; a main pipe outlet (5) is formed in the lower part of the tubular crystallizer. According to the multi-section feeding type anti-solvent spraying crystallizer provided by the invention, a solution system A with a certain concentration is prepared by dissolving heterocyclic organic medicine particles, inorganic salt or oxide and particles P of a nitryl energy-containing material into a good solvent S; crude particles P are recrystallized by adopting the tubular crystallizer; the solution system A and a bad solvent are rapidly mixed to continually form a crystal nucleus andthe crystal nucleus grows continually; finally, a suspension solution containing fine particles P is obtained at an outlet of the spraying crystallizer. The particle products obtained by the method have the advantages of controllable grain diameter sizes and distribution, narrow grain diameter distribution and the like.

The invention discloses a magnetic nanoparticle composite film and a preparation method thereof, and belongs to the technical field of magnetic material control of film materials. In the magnetic nanoparticle composite film, the composite film is formed by continuously and alternately depositing a magnetic layer and an insulating layer, and the composite film has a thickness of 15-100 nm; and themagnetic layer is a layer film formed by uniformly embedding magnetic particles in an insulating medium, the component of the magnetic particles is Fe or Fe-Ni, the volume fraction of the magnetic particles is 80-95%, and the thickness of the magnetic layer is 1-20 nm; and the insulating layer is composed of an insulating medium and has a thickness of 0.1-10nm. The magnetic nanoparticle compositefilm prepared by the invention can control the merging and grow of the nanoparticles, the particle size and the distribution uniformity and the like, thereby improving the magnetism while realizing grain refinement. The composite film prepared by using the preparation method provided by the invention is particularly suitable for electronic components in the field of digital electronic industry andcommunication technology.

The invention relates to the technical field of titanium dioxide, and discloses a method for regulating and controlling the particle size of a hydrolyzed seed crystal, which comprises the following steps: dividing 160-250g / L of titanium liquid into two parts, namely a titanium liquid A and a titanium liquid B; the titaniferous solution A and the titaniferous solution B are preheated respectively, and the temperature of the preheated titaniferous solution A is different from that of the preheated titaniferous solution B; the preheated titaniferous solution A is added into the preheated alkali liquor, the concentration of the alkali liquor is 40-150 g / L, a system A is obtained through stirring, and the pH of the system A is controlled; adding preheated titanium liquid B after primary curing, stirring to obtain a system B, and controlling the pH value of the system B; and then secondary curing is carried out, such that hydrolysis seed crystals are obtained. According to the method, the particle size of the hydrolyzed seed crystal precursor is changed by regulating and controlling the temperature and the speed when the titanium solution and the alkali solution are neutralized and adopting different temperature conditions and pH conditions, so that the particle size of the hydrolyzed seed crystal is regulated and controlled; the particle size range of the obtained hydrolyzed seed crystal is 2-30 nm, and the particle size range is large.

The invention relates to the technical field of oil and gas production, in particular to preparation of a novel environment-friendly efficient gas hydrate inhibitor and an application thereof. The novel environment-friendly efficient gas hydrate inhibitor is prepared from a 2-vinylpyridine-N-vinyl-2-pyrrolidone copolymer with the mass concentration of 0.6 percent to 1.0 percent, a nonionic surfactant with the mass concentration of 1.8% to 3.4%, glycol ethers with the mass concentration of 4.1% to 5.8%, a water-soluble monomer with the mass concentration of 2.4% to 4.2% and the balance deionized water. The preparation method of the inhibitor comprises the following steps: oil phase preparation, water phase preparation, mixed reaction and the like. The inhibitor prepared by the invention hasa good inhibition effect, can effectively inhibit hydrate nucleation, enables the generated hydrate to be in a uniform and stable slurry state, disenables a hydrate aggregation phenomenon, has the advantages of low toxicity, no volatilization, easy degradation, environmental friendliness and the like, and has a good application prospect.

The invention discloses a particle size controllable manganous-manganic oxide nanoparticle material synthesized at a constant temperature and a preparation method thereof. The material is synthesized at the constant temperature in an alcohol phase environment from manganese acetate and strong alkali. The particle sizes of manganous-manganic oxide nanoparticles can be controlled at 2-50nm. The preparation method comprises the following steps of: separately dissolving manganese acetate and strong alkali in the alcohol phase environment firstly in a proportion, then stirring and mixing the two for 24h, and adding water to adjust the particle sizes of the particles; and then stirring the mixture for 12h, performing centrifugal separation on the obtained dispersing liquid, and cleaning and drying the mixture with ethanol to obtain a final product. According to an electrode material prepared from the manganous-manganic oxide nanoparticle material prepared by the method, the reversible capacity of the electrode material can reach 400mAh / g above if being charged and discharged for 60 times at a current density of 100mA / g, and the capacity of the electrode material is kept at 250mAh / g at the current density of 1000mA / g.

The invention belongs to the field of surface modification of biological implant materials, and particularly relates to a method for in-situ construction of metal organic framework nanoparticles on the surface of titanate. The method comprises the following steps that titanium alloy is subjected to alkali heat treatment, and a titanate structure with a special shape is formed on the surface of the titanium alloy; and on the basis, Zn<2+> ions are adsorbed in titanate by utilizing the interlayer cation loading capacity of the titanate, a 2-methylimidazole ligand is dropwise added on the surface of the titanate, a growth environment of the metal organic framework nanoparticles is provided, and the metal organic framework nanoparticles controllably grow on titanate fibers in situ by regulating and controlling the concentration of a solvent and the ligand. The metal organic framework nanoparticles prepared by the method tightly wrap the titanate fibers, the original nanofiber structure of the titanate is reserved, the nanostructure morphology of the titanate can be enriched, the large specific surface area of the metal organic framework nanoparticles and the titanate structure can be used as a loading platform of two different systems, and the intelligent medicine carrying function is realized.

The invention discloses a microfluidic preparation method for regulating and controlling the particle size of lipidosome. The method comprises the following steps: A, dissolving a lipid material in anorganic solvent to form a lipid solution; and B, pumping the lipid solution and a buffer solution into a micro-fluidic chip from inlets of different channels respectively, and carrying out micro-mixing to obtain the liposome. According to a traditional liposome preparation method, under the condition that a lipid prescription is not changed, liposomes with different particle sizes and uniform distribution are difficult to prepare according to design requirements. The invention provides the micro-fluidic method, which prepares liposomes with different particle sizes by changing the compositionof a water phase buffer system, the composition of an organic phase and the proportion of the water phase to the organic phase on the premise of not changing the lipid prescription. The method is simple in process, the prepared liposome is adjustable in particle size, uniform in particle size and good in repeatability, and more possibilities are provided for biological application of the liposome.

The invention discloses a preparation method of silver chloride. According to the invention, raw materials which are a silver-containing solution and a chlorine-containing additive solution are well mixed, and a reaction is allowed; the product obtained after the reaction is subjected to centrifugation, washing and drying, such that silver chloride is obtained. The chlorine-containing additive comprises chlorophenol or chlorine-containing quaternary ammonium salt. According to the invention, chlorophenol or chlorine-containing quaternary ammonium salt is adopted as a chlorine source for silver chloride synthesis. Cl<-> released after the reaction can be adopted as a chlorine source of silver chloride. Also, organic groups can be adsorbed on the surfaces of silver chloride, and assist in preventing particle agglomeration with steric hindrance. Therefore, the use of other dispersing agents can be avoided, and raw material application can be reduced. Also, through changing the doses of the silver-containing solution and the chlorine-containing additive, specific adsorption of the chlorine-containing additive on different crystal faces of the surfaces of silver chloride particles is realized, and silver chloride with different morphology can be obtained. Also, through changing the reaction time, silver chloride particle growth time can be changed, such that the purpose of controlling particle size is met.

Disclosed is a process for preparing polyurethane particulate and polyurethane particulate prepared therefrom. The polyurethane particulate has properties such that it is easy to control to a spherical form, the polyurethane particulate can be prepared in a desired particle size, the color thereof is stably exhibited, a washing process thereof is easy because almost no foam is generated in the washing process, and the preparation cost can be lowered because the particles do not lump and a separate grinding process is not needed, by using an inorganic suspension stabilizer in the manufacture process of the polyurethane particulate.

The invention relates to a hydrothermal synthesis method of titanium dioxide nanoparticles. The method comprises the following steps: (1) drawing a microfluidic pipeline diagram of a two-dimensional plane; (2) printing a pipeline template on a transparent plastic film to prepare a reverse mould; (3) placing the reverse mould into an open culture dish or a glass dish, evenly mixing polydimethylsiloxane with a curing agent according to a ratio of 10 to 1, pouring the mixture onto the reverse mould, and put the reverse mould into a drying oven at the temperature of 70 DEG C, and heating for 1h; (4) removing the mould to obtain a cured microfluidic pipeline, and bonding the microfluidic pipeline to a glass substrate to obtain a microfluidic chip; (5) using the microfluidic chip to prepare emulsion by taking an aqueous solution of titanium trichloride as an aqueous phase and using dodecane as an oil phase; (6) heating the emulsion in a water bath at 70 DEG C for 2h, stirring, and preciselycontrolling the sizes of the titanium dioxide nanoparticles by adjusting the sizes of the emulsion droplets; (7) washing the titanium dioxide nanoparticles with water and an organic solvent, drying, and finally characterizing.