265results about How to "Avoid reunion" patented technology

The invention provides a preparation method for a load type hydrogenation catalyst with high activation by hot water deposition. The saline solution of the reactive metal of VIB family is taken as a precursor, an inorganic acid solution as a precipitator and an organic acid as a dispersant; the metallic oxide particles are generated by a liquid deposition reaction in a hydrothermal condition; the organic acid is used for avoiding the conglobation of the oxide particles as well as reducing mutual effects between the oxide and a carrier; the high reaction activation and strong penetrability of subcritical water is utilized to evenly disperse active components on the carrier. The method is particularly suitable for preparing a W/gamma-Al2O3 catalyst, the prepared W/gamma-Al2O3 catalyst has high dispersion degree, relatively weak mutual effects between the active components and the carrier and higher desulfurization activation compared with a catalyst which has same content of active components and is prepared by a conventional pore volume saturation soaking method.

The invention relates to the preparation of an electrode material, and discloses a preparation method of a porous current collector/tin-base alloy/carbon nano-tube integrated electrode. The integrated electrode can be applied to a negative electrode of a lithium ion battery. The preparation method comprises the following steps of: preparing a porous current collector by adopting a hydrogen bubbletemplate method; and then, depositing tin-base alloy and a carbon nano-tube on the porous current collector by adopting a composite electrodeposition method to obtain the porous current collector/tin-base alloy/carbon nano-tube integrated electrode.

The invention discloses a graphene oxide-silver compound particle and a preparation method thereof. The graphene oxide and silver compound particle is in a core-shell structure; a core is an organic matter or inorganic matter particle; and a shell is the graphene oxide-silver compound particle. The preparation method particularly comprises the following steps of: preparing a water solution containing graphene oxide; preparing a suspension solution of the organic matter or inorganic matter particle; preparing the core-shell structure compound particle covered by graphene oxide on the surface; mixing the core-shell structure compound particle covered by graphene oxide on the surface with a silver nitrate solution; adding a reducing agent to carry out one-step reduction reaction under a nitrogen atmosphere; and naturally cooling a reaction solution to a room temperature, centrifuging, washing and drying to obtain the graphene oxide-silver compound particle. According to the graphene oxide-silver compound particle and the preparation method thereof disclosed by the invention, the performance of the finally-obtained graphene oxide-silver compound particle is very good, the utilization amount of the reducing agent used in a preparation process is less and the production cost is low.

The invention provides a modified catalyst for a low-temperature fuel cell, which takes powdered carbon as carrier and palladium alloy modified by platinum as active component. A preparation method of the modified catalyst comprises: an organic sol-gel method is firstly adopted to prepare PdM (M= Fe, Co, Ni and the like) alloy, and modified catalyst Pt-PdM/C having high electrocatalytic activity for oxidation and reduction of organic micromolecule is prepared by an exchange deposition method. The non-precious metals such as Fe, Co, Ni, Cu and the like which have comparatively rich resources are selected for preparing the Pd alloy, the Pd is enriched on the surface of the alloy, and the Pd alloy is modified by Pt, so that the capacity of the non-precious metals can be greatly reduced, and the cost of the catalyst is also greatly lowered; meanwhile, the modified catalyst has good stability and electrocatalytic activity, thus prolonging the service life of the catalyst and being capable of working for a long time in the actual running process of the fuel cell.

The invention proposes a preparation method for a negative electrode paste of a lithium battery. The preparation method comprises the following steps of: A, adding a thickener into a deionized water solvent, uniformly dissolving the mixture by using an agitating machine, and taking out the mixture for use; B, adding a negative active matter and a conductive agent into an agitating vessel according to a proportion, and agitating and dispersing the mixture; C, adding the thickener solution in an amount of 55-60% of the total quantity into a powder body after agitation, agitating and dispersing the mixture, and controlling the temperature of the paste to be 25-35 DEG C; E, carrying out viscosity test on the viscosity of the paste obtained in the step D, and directly forwarding into the next step if the viscosity is within a normal range of 2,000 to 5,000 Mpa.S; F, adding a binding agent again, and agitating and dispersing the mixture; and G, vacuumizing the vessel at an agitating state, thereby obtaining the prepared negative electrode paste. Compared with the traditional negative electrode paste preparation process, the preparation method has the advantages that the production efficiency is greatly improved.

The invention discloses a silicon-carbon composite material and a preparation method thereof, and a lithium ion battery. The method comprises the following steps of (1) coating porous carbon on porous silicon dioxide; (2) reducing the porous silicon dioxide to porous silicon by using a metal more active than silicon to obtain a porous carbon-porous silicon-metal oxide composite; and (3) etching the metal oxide in the carbon-porous silicon-metal oxide composite to obtain the silicon-carbon composite material. In the silicon-carbon composite material, the porous silicon is prepared by a metallothermic method; the porous silicon particles prepared by the metallothermic method are in micron size, so that agglomeration rarely occurs; and pore walls in the porous silicon particles and apertures are in nano size. Compared with imporous micron silicon powder, the silicon-carbon composite material shortens diffusion paths of lithium ions in silicon matrix, thereby facilitating large-current discharge; the holes in the porous silicon particles can accommodate volume expansion in a silicon-embedding process; and charge-discharge cycle life of the material is prolonged.

The invention discloses a method for preparing a functional textile of nano materials. The method takes soluble inorganic metal salt as substrate and leads the configurational ions to be in-situ deposited in the micropore of the textile by selecting a precipitator and a complexing agent and controlling the process condition, thus synthesizing the nano materials directly on the textile and finally endowing the textile with various nano functions such as ultraviolet radiation resistance, anti-bacteria, odor elimination, anti-static property, electromagnetic wave resistance, infrared heat conservation, flame retarding and coloring. The method effectively overcomes the agglomeration problem during the preparation and application of the nano materials and solves the problem that the nano materials and the textile have bad adhesion simultaneously. The technology has great function ion selection range, can synthesize the nano materials of different sorts and different appearance, and has the advantages of short process flow, low equipment requirement, light sewage burden, and endows the textile with various functions; furthermore, part processing technology also has the coloring function, extremely obvious economic benefits and industrial generalization values.

The invention relates to the field of a new material, in particular relates to the technical field of preparation and application of a functional high-polymer material, and discloses a preparation method of graphene modified waterborne polyurethane. According to the method disclosed by the invention, firstly, graphene is modified by a coupling agent and then is blended with waterborne polyurethane so as to implement excellent dispersion; meanwhile, a secondary chain extension mode is adopted and an interpenetrating network structure is introduced; after resin prepared by the method is formed into a film, the film has excellent hardness, flexibility, compactness, impact resistance, corrosion resistance, water resistance, aging resistance, pollution resistance and the like, and can be applied to the fields of automobile coating, wood lacquer, buildings, office furniture, leather and the like.

The invention provides a negative electrode material preparation method, a negative electrode material, a negative electrode piece and a lithium ion battery. The negative electrode material preparation method comprises the following steps: mixing and heating a core material and a heteroelement-containing polymer or a heteroelement-containing ionic liquid; mixing and heating the core material coated with the heteroelement-containing polymer or the heteroelement-containing ionic liquid and functionalized graphene; and sintering the functionalized graphene, the heteroelement-containing polymer orthe heteroelement-containing ionic liquid and the core material to obtain the negative electrode material with the surface of the core material being fixedly coated with the graphene by doping carbon. The negative electrode material preparation method allows the negative electrode material with the core material coated with doped carbon fixed graphene to be obtained through fixing graphene by doping carbon, so graphene is stably fixed on the surface of the core material, and graphene agglomeration is avoided.

The invention provides a polymer/graphene aerogel composite foam material which is prepared from graphene aerogel and a thermoplastic polymer, wherein the graphene aerogel serves as a framework, the thermoplastic polymer is attached to the three-dimensional net structures of the graphene aerogel, and foam holes with closed pore structures are formed in the thermoplastic polymer. The composite foammaterial has mutually communicated three-dimensional net structures, and the content of the graphene aerogel in the composite foam material is 0.5%-10%. The invention also provides a preparation method of the composite foam material. The invention provides a new idea for solving the problem of agglomeration of graphene in polymer matrix materials.

The invention discloses a graphene loaded zirconium oxide composite material, a preparing method thereof, and the application thereof as a desulfurizer adsorbent. The preparing method comprises the steps of 1, mixing graphene oxide dispersion liquid with zirconium oxychloride solution, and then adding sodium hydroxide till pH becomes 8-14, so that a precursor mixture is obtained; 2, conducting hydrothermal reaction of the precursor mixture at 190-210 DEG C for 20-60 min, and then conducting washing and drying to obtain the composite material. Nano-zirconia particles generated through hydrothermal reaction of the composite precursor have a uniform size, the surface of graphene is uniformly loaded with the nano-zirconia particles, agglomeration of nano-zirconia is prevented, the material has a large specific area, and the efficient adsorption property of zirconium oxide is fully utilized; when the composite material serves as the adsorbent to remove sulfate ions in water, adsorption capacity is high, adsorption rate is high, recycling can be achieved easily, economic benefits and environment benefits are high, and application prospects are broad.

The invention relates to an anode active material of a lithium ion battery. The anode active material contains a core body and a plurality of composites adhered to the outside surface of the core body. The core body is made from a carbon material. The composites contain a first material and a second material for cladding the first material, wherein the first material contains one or more elements selected from elements which can react with lithium to form an alloy; and the second material contains one or more compounds selected from transition metal oxide, transition metal nitride and transition metal sulfide. The invention also relates to a preparation method of the above anode active material and a lithium ion battery with the use of the anode active material. The anode active material contains the first material and can raise battery capacity. In addition, the anode active material contains the second material for cladding the first material, so as to effectively inhibit volume expansion of the first material due to multi-time charge and discharge. Therefore, cycling performance of the battery is improved.

The invention relates to a preparation method for a hydrophilia polyvinylidene fluoride hollow fiber membrane. The preparation method comprises the following steps of: (1) dissolving hydrogen-terminated silicone oil and vinyl-terminated methoxy polyethylene glycol into methylbenzene, adding a Pt (platinum) catalyst, and reacting so as to obtain an amphiphilic polymer; (2) adding a nanometer oxide processed by a silane coupling agent into the methylbenzene, and then adding the amphiphilic polymer and the Pt catalyst so as to react to obtain an amphiphilic polymer grafted nanometer oxide particle; (3) mixing the polyvinylidene fluoride, a composite diluent and the amphiphilic polymer grafted nanometer oxide particle so as to prepare a membrane casting liquid, then extruding the membrane casting liquid through a spinning jet so as to obtain a primary hollow fiber, solidifying through a coagulating bath, stretching and retracting so as to obtain a primary hollow fiber membrane, then extracting, performing soak cleaning, and finally processing through a pore former so as to obtain the hydrophilia polyvinylidene fluoride hollow fiber membrane. The preparation method is simple, the purpose of hydrophilic modification is achieved by mixing modified nanometer oxide particles, and the antifouling property of the membrane is improved finally.

The invention relates to a tetrapod-like zinc oxide/graphene composite material and a preparation method thereof. The composite material is formed by growing a graphene nano sheet on the surface of tetrapod-like zinc oxide and belongs to the fields of novel micro-nano material and material preparation. The method comprises the following steps of step1, preparing reaction precursor liquor containing zinc nitrate or zinc acetate and oxidized graphene, wherein the pH value is 8 to 13; step 2, carrying out hydrothermal reaction of the precursor liquor prepared in step 1 at the temperature of 100 to 200 DEG C to prepare a reaction midbody; and step 3, calcining the midbody obtained in the step 2 in an environment of 200 to 680 DEG C while controlling the heating rate at 3 to 8 DEG C per minute to obtain the tetrapod-like zinc oxide/ graphene composite material. By adopting the tetrapod-like zinc oxide/graphene composite material and the preparation method thereof, the defect of existing tetrapod-like zinc oxide that the catalyzing efficiency is low and the clustering problem of the oxidized graphene in the reduction process can be solved. The tetrapod-like zinc oxide/graphene composite material is expected to be popularized in the fields such as heat conduction, piezoelectricity, voltage-sensitive, wave absorption, sound absorption, vibration absorption, antibiosis, anti-weeds, catalysis and the like.

The invention discloses a Li-ion battery tin-nickel alloy cathode material. The preparation method comprises the following steps of: firstly, preparing plating solution, adding the plating solution into a plating bath, plating by connecting a tin sheet with a nickel sheet together as the anode and clutch gold as the cathode, cutting the plated clutch gold into sheets after washing and drying to obtain the Li-ion battery tin-nickel alloy cathode material. The method is simple and easy to operate, provides conditions for industrialized production and is of notable practical value and economic benefit. The Li-ion battery tin-nickel alloy cathode material prepared and obtained has no active nickel of intercalation/deintercalation Lithium freed from the tin-nickel alloy cathode material during and charging and discharging and is dispersed evenly on the tine-nickel alloy formed after Lithium intercalation, avoiding agglomeration of big tin block during Lithium deintercalation.

The invention discloses a ceramic ink, which comprises the following raw materials in percentage by mass: 57-57% of ceramic powder, 1-5% of a dispersant, 8-30% of glycerol, 8-35% of water and 5-20% of an organic solvent; and the pH value of the ceramic ink is 8-12, and the dispersant is composed of ammonium polyacrylate and polyvinylpyrrolidone in a mass ratio of 1:5 to 5:1. The invention also discloses a preparation method of the ceramic ink and the application of the ceramic ink in the ink-jet printing of false teeth. According to the invention, the dispersion and ink stability of the ceramic ink are improved by a binary dispersant, and then the solid phase content of the ceramic ink is increased to 20-40 vol. %, so that the ceramic ink can be used for directly printing ceramic products such as false teeth and the like through ink-jet printing, and the relative density of ceramic products is more than 98%.

The invention provides a carbon nanotube/graphene composite gel. In the carbon nanotube/graphene composite gel, carbon nanotubes are inserted into the graphene gel to form three-dimensional porous structure, thereby contributing to prevention of graphene interlayer agglomeration, increasing surface area, and improving the electrochemical performance of the carbon nanotube/graphene composite gel. A method for preparing the carbon nanotube/graphene composite gel comprises adding carbon nanotubes to a graphene oxide aqueous solution and dispersing the carbon nanotubes uniformly by a hydrothermal method; obtaining the carbon nanotube/graphene oxide composite gel by using thermal treatment; and obtaining the carbon nanotube/graphene composite gel by using reducing, cleaning, and drying methods. An experiment testifies that the carbon nanotube/graphene composite gel has higher conductivity than graphene gel and can be used as an electrode material. Used as the electrode material of a super capacitor, the carbon nanotube/graphene composite gel increases the specific capacitance and the power density of the super capacitor.

The invention provides a magnetic metal-organic framework material with a core-shell structure and belongs to the field of metal-organic framework materials. According to the material provided by the invention, magnetic microspheres, which take magnetic nano Fe3O4 as cores and take UiO-66 porous frameworks as shells, are prepared through carrying out functional modification on the surface of super-paramagnetic nano Fe3O4 firstly by thioglycollic acid, and then, respectively bonding metal zirconium (Zr) ions and a terephthalic acid ligand to the surface of paramagnetic nano Fe3O4 in a coordinating manner by a layer-by-layer self-assembly method, are regular in shape, have the particle size of 600-700nm, are uniform in particle size distribution and have superparamagnetism, thermal stability, chemical stability and solvent resistance. Due to superparamagnetism, the external magnetic field separation, washing purification, reuse and the like of UiO-66 can be achieved, so that the utilization efficiency of UiO-66 materials is greatly increased.

The invention discloses a porous graphene loaded titanium dioxide composite material and a preparation method thereof. The preparation method includes the steps: (1) preparing graphene quantum dot suspension liquid; (2) preparing loaded titanium dioxide graphene quantum dots; (3) performing surface treatment; (4) preparing the composite material. The graphene quantum dots are used as titanium dioxide carriers, nano titanium dioxide is finally attached onto porous graphene after surface treatment, can be more effectively loaded and fixed and can be prevented from agglomeration, stability of the nano titanium dioxide is remarkably improved, and agglomeration of the composite material is avoided, so that obtained porous graphene/titanium dioxide photocatalysts have excellent photocatalytic degradation performance and can be widely applied to the environmental protection field of sewage treatment and the like.

The invention provides a method for preparing titanium carbide ceramic powder, which belongs to the field of preparing ceramic powder. A titanium source comprises soluble titanium salt titanium tetrachloride or titanium tetrabromide; a carbon source comprises glucose, sucrose, citric acid and soluble starch; oxidant is nitric acid; fuel is urea; ammonium nitrate is a blending agent; the molar ratio of the titanium source to the carbon source is 1: (4-16); and the mixture ratio of the nitric acid to the urea to the ammonium nitrate according to (n nitric acid+n ammonium nitrate)/(2n urea+n ammonium nitrate) is (1-12):2. The method comprises the steps of dissolving various raw materials in water, heating the raw materials at a temperature between 100 and 600 DEG C, obtaining a precursor after the combustion reaction of a solution, grinding the precursor, pretreating the precursor for 0 to 10 hours at a temperature between 200 and 800 DEG C, subjecting the precursor to carbothermal reduction for 1 to 10 hours in flowing argon atmosphere at a temperature between 800 and 1,800 DEG C, subjecting products to subsequent treatment and obtaining titanium carbide powder. As the titanium source and the carbon source in the precursor are small in particle size, uniform in mixture and good in reaction activity, the method has the advantages of lowering the reaction temperature of carbothermal reduction and improving reaction rate, and can prepare the nanometer non-oxide ceramic powder with good dispersion property.

The invention discloses a high-transparent ultraviolet separation ceramic-imitating flexible nanometer composite membrane material and a preparation method thereof and belongs to the field of nanometer composite materials. The composite membrane material comprises 20-85 wt% of core-shell nanometer particles and 15-80 wt% of polymer macromolecules. The composite membrane material is prepared through in situ polymerization which includes two steps of phase transfer of nanometer particles and bulk polymerization of the nanometer grains in polymer monomer. The nanometer grains are transferred to the polymer monomer from initial dispersoid through a method of solution phase transfer, and then the high-transparent ultraviolet separation ceramic-imitating flexible nanometer composite membrane material is prepared through thermal initiation polymerization or ultraviolet light initiation polymerization. The nanometer composite membrane material is high in transparency, has good thermal stability, strong ultraviolet shielding capacity and certain flexibility, can be used for manufacturing transparent optical devices, uvioresistant devices, special light control devices and the like.

A mixed powder quantitative conveying and paving device comprises a silo, a powder conveying device, a powder paving device, a powder scattering device and an anti-blocking device. The powder scattering device is two large pin shafts fixed to the middle of the silo and rotating in the opposite directions, and scattering and carding are conducted on mixed powder through the powder scattering device. The anti-blocking device is a small rotatable pin shaft fixed to the upper portion of a silo outlet, and the mixed powder is prevented from being blocked through rotation, the powder conveying device comprises a symmetrically arranged and synchronously operated belt pulley pair, the two belt pulley pair is fixed in belt pulley pair bearing holes through sliding groove rails, bearing sliding blocks are fixedly arranged between spindles of the belt pulley pairs, the bearing sliding blocks can slide in the sliding groove rails, and the belt pulley pair can slide along with sliding of the bearing sliding block to adjust the size of a gap of the outlet. The mixed powder quantitative conveying and paving device is suitable for quantitative and even paving conveying of various mixed powders of different particle sizes.

The invention discloses a flexible force-sensitive sensor based on silver-embedded nanofibers and a preparation method thereof. The sensor comprises a flexible force-sensitive resistance film which is connected to a power supply and a current meter in series. The flexible force-sensitive resistance film comprises a silver-embedded nanofiber film which is formed by alginate/silver nanoparticle composite nanofibers. The alginate/silver nanoparticle composite nanofibers are sodium alginate nanofibers prepared by an electrostatic spinning method, alginate silver nanofibers are made through ion exchange, and the alginate/silver nanoparticle composite nanofibers are obtained through reduction of silver ions. The sensitive resistor of the sensor has good flexibility and can be directly adhered to a skin, the skin is not hurted, the temperature performance and sensitivity are good, and the monitoring of physiological activities such as a pulse, a breathing frequency and a heartbeat can be realized. At the same time, the sensor also has an antibacterial effect and is more safe to directly contact with the skin.

The invention relates to an ultralow-density oil-base drilling fluid. The invention is characterized in that the ultralow-density oil-base drilling fluid is prepared from the following raw materials: base oil, a density reducer, a suspension stabilizer, an emulsifier, a tackifier, a fluid loss additive, a flow pattern regulator, an alkalinity regulator and a calcium chloride water solution. The base mixed oil is prepared by the following steps: mixing 3# white oil, 5# white oil and natural gas prepared oil, adding a flash point enhancer while stirring, and standing for 0.5-1 hour; and stirring at low speed at the temperature of 30-40 DEG C, and slowly adding oil-soluble nano fumed silica while stirring, wherein the addition process is controlled at 2-3 hours. The ultralow-density oil-base drilling fluid has the advantages of favorable emulsifying stability, favorable rheological properties, high inhibition property for mud shale, high emulsion-breaking voltage, low filter loss, low density (0.75-0.90 g/cm<3>), and high sand carrying and pressure bearing capacities, is beneficial to cleaning the borehole and enhancing the mechanical drilling speed, solves the problem of severe lost circulation in the low-pressure formation and long-section shatter zone formation, and is especially suitable for low-pressure oil gas pools and depletion water-sensitive formations.

The invention discloses a method for preparing a lithium manganese oxide battery material, which comprises the following steps of: (1) dissolving a manganese source and a doped ion source into water, then adding an alkaline medium to form ion-doped manganese oxide precipitation, filling oxidizing gas into solution, finishing filling until a pH value of the solution reaches 6 to 7 and separating to obtain ion-doped manganese oxide; (2) mixing the ion-doped manganese oxide and aqueous solution of lithium hydroxide and performing a reaction under the hydrothermal condition of 150 to 500 DEG C to obtain the lithium manganese oxide; (3) pouring a mixture of a carbon source and water, a mixture of oxide and water or precursor salt solution of the oxide which is used for cladding into the obtained reaction solution, sufficiently stirring the obtained mixture, collecting the reaction solution and drying to obtain an intermediate product; and (4) in the protective atmosphere, sintering the intermediate product at a temperature of 500 to 800 DEG C to obtain a finished product. The lithium manganese oxide material prepared by the method has uniform particle size and the high and low temperature cycle performance and the high multiplying power discharge performance of the lithium manganese oxide material are both obviously superior to those of a like product synthetized by a conventional high-temperature solid-phase method.

The invention discloses a preparation method of a high-purity aluminum oxide ceramic. According to the preparation method, a nano Al2O3 coating formed on the surfaces of aluminum oxide particles is used as a sintering aid to ensure that a small amount of the sintering aid can be uniformly dispersed in a main phase, so that uniform adding of a small dose of the sintering aid is realized. The preparation method not only ensures the purity and performance of the high-purity aluminum oxide ceramic and meets process requirements for preparation of the aluminum oxide ceramic, but also effectively solves the problem that when the particle size difference of main phase powder and the sintering aid is large, particles of a nano auxiliary agent are gathered in a main phase powder particle gap; and moreover, partial over-firing is avoided, so that the uniformity of sintering of the main phase powder particles and the sintering assisting effect of the sintering aid are effectively improved.

The invention discloses lithium iron phosphate water-based positive electrode slurry and a preparation method thereof. The water-based slurry comprises the following components in percentage by mass:40%-50% of lithium iron phosphate powder, 2%-6% of a conductive agent, 2%-5% of a water-based binder, 0.5%-2% of a dispersing agent and the balance of deionized water. The preparation method comprisesthe following steps of: S1, preparing a composite glue solution, S2, preparing a conductive dispersion liquid, S3, preparing a lithium iron phosphate dispersion liquid, S4, mixing and dispersing forthe first time, S5, mixing and dispersing for the second time, and S6, conducting vacuum defoaming and standing. The lithium iron phosphate water-based positive electrode slurry prepared by the methodis uniform in dispersion, good in consistency and stability and convenient to coat; meanwhile, the solvent selected by the slurry is a water-based solvent, so that the slurry is environment-friendly,pollution-free and low in cost; the preparation method is simple and convenient to operate, high in production efficiency and suitable for batch production.

The invention relates to the technical field of film engineering and particularly relates to a nano-silicon dioxide/nano-fiber oil-water separation composite film and a preparation method thereof. The preparation method comprises the following steps: (1) preparing a nano-silicon dioxide liquid: mixing nano-silicon dioxide particles and a water-soluble polymer, and dissolving the mixture into a solvent, so as to obtain the nano-silicon dioxide liquid; (2) preparing a nano-fiber suspension liquid: dissolving nano-fibers which are processed by virtue of a high-speed shearing machine into a solvent, so as to obtain the nano-fiber suspension liquid; and (3) preparing the nano-silicon dioxide/nano-fiber oil-water separation composite film: uniformly mixing the nano-silicon dioxide liquid with the nano-fiber suspension liquid, so as to obtain a film forming liquid. The preparation method is simple; and the prepared nano-silicon dioxide/nano-fiber oil-water separation composite film has relatively good mechanical strength and relatively high separation efficiency.

The invention discloses a method for producing a composite PGA/DMBG bone stent from polydopamine modified mesoporous bioglass. The method comprises the following steps: modifying polydopamine by usingan in-situ polymerization method on the surface of an MBG powder to obtain a DMBG powder; mixing the DMBG powder and a PGA powder by a liquid phase, performing solid-liquid separation to obtain a solid, drying and grinding the solid to obtain a composite PGA/DMBG powder; and performing selective laser sintering on the obtained composite PGA/DMBG powder to obtain a composite PGA/DMBG bone stent. The composite stent has the good Biological activity, cell response and enhanced mechanical properties and has a broad application prospect in the tissue engineering field.

A process for preparing sulfide nano-particles includes such steps as preparing the solution of metal salt, adding quaternary ammonium salt, dripping the solution of sodium sulfide in it to generate deposit, filter, water washing, removing the ions of impurities, drying and calcining.