2549results about How to "Mild preparation conditions" patented technology

The invention discloses a preparation method of magnetic/gold nano particles. The preparation method comprises the following steps: firstly adopting a co-precipitation method to prepare the magnetic Fe3O4 nano particles; polymerizing the dopamine in-situ on the surfaces of the magnetic particles to obtain Fe3O4 nano particles modified by the poly dopamine; introducing polyphenol and amino groups to the surfaces of the Fe3O4 nano particles; absorbing the nano gold seeds on the surfaces of the modified magnetic particles through the static action; adopting the nano gold which is absorbed on the surfaces of the magnetic particles as the seed, adopting the polyphenol on the surfaces of the magnetic particles as a reducing agent, gradually adding the chloroauric acid liquid to gradually produce the gold layers on the surfaces of the magnetic particles to obtain the core-shell magnetic/gold nano particles. The nano particles have good water dispersion and strong magnetic respond performance. The diameters of the nano particles are 30-100 nanometers, the saturation magnetization is 30.1-38.7emu/g, and the nano particles are superparamagnetic. The nano particles have wide application prospect on the fields of targeted drug controlled release, thermal therapy, separation of protein and enzyme, etc.

The invention belongs to the technical field of membranes and particularly relates to a metal-organic framework (MOF) modified graphene/polymer hybrid proton exchange membrane and a preparation method thereof. According to the hybrid proton exchange membrane, an MOF is used for modifying graphene inorganic particles having a special structure, so that the proton conductivity of the proton exchange membrane can be effectively improved, and methanol permeability can be effectively inhibited; the MOF grows on graphene oxide in situ so as to effectively avoid the formation of multilayer graphene and increase the proton transfer rate; the framework structure of the MOF benefits the quick passing of protons; moreover, since he pore size of the MOF has selectivity, the sinuosity of methanol permeability channels can be increased, and therefore, the methanol permeability of the hybrid proton exchange membrane is reduced. The preparation method is simple in operation process and mild in preparation conditions, can be put into mass and large-scale production, and has a wide application prospect.

The invention relates to cosmetic active ingredient-containing lipidosome as well as a preparation method and application thereof. The cosmetic active ingredient-containing lipidosome is small and uniform in particle size, so that the wrapped active ingredients can permeate the cuticles to the deep layer of skin so as to effectively realize deep skin care. Moreover, due to the small particle size, the collision and sedimentation probability of the finished lipidosome product is decreased and the stability of the lipidosome cosmetic is improved. The cosmetic active ingredient-containing lipidosome is prepared by a host-guest chemical method, so that the lipoid molecules and the active ingredient molecules are uniformly mixed on the molecular level, so that the gathering inactivation phenomenon of the active ingredients is avoided; the preparation condition is mild, so that the active ingredients are prevented from damage.

A process for preparing the crystal phase controllable TiO2 nanocrystals includes such steps as hydrolyzing the Ti-cotnained compound in the aqueous solution of alcohol to obtain amorphous TiO2 powder, adding inorganic acid, hydrothermal treating, filtering, washing and drying. Its resultant TiO2 nanocrystal has the continuously regulatable ratio of anatase phase to rutile phase.

The invention relates to a preparation method of covalent organic framework composite microspheres with core-shell structures. The method comprises the following steps: dissolving silicon dioxide microspheres, a first construction element and a second construction element in an organic solvent; and after adding a catalyst, rapidly synthesizing into the composite microspheres with core-shell structures at a certain temperature. In a preparation process, reaction conditions are gentle, the method is simple, and the yield is high; the prepared covalent organic framework composite microspheres have the advantages of good core-shell morphology, high specific surface area, ordered pore structures, good mechanical stability, thermal stability, chemical stability and the like, if the microspheres are used as a chromatographic stationary phase, the chromatographic mass transfer resistance can be reduced effectively, the theoretical plate height is improved, and finally, column efficiency and degree of separation are improved; and if the microspheres are used as solid-phase extracting filler, the enrichment effect can be improved remarkably. The covalent organic framework composite microspheres with core-shell structures have good application prospects in the aspect of separation and enrichment of small organic molecules.

The present invention relates to a non-noble metal oxide combustion catalyst and a preparation method and use thereof, and belongs to the technical field of energy utilization and environment protection. The catalyst is iron oxide, cobaltosic oxide, nickel oxide, cupric oxide, vanadium oxide, chrome oxide, manganese dioxide or cerium dioxide prepared according to the following steps: (1) using hydrothermal chemical synthesis to form a precursor of a catalyst; and (b) washing, filtering, shaping, drying and calcinating the obtained precursor of the catalyst, and finally forming a combustion catalyst or coating the precursor of the catalyst on a carrier to form a combustion catalyst. The catalyst prepared by the method can be used in catalytic combustion of methane and other VOC gas, and has the advantages that the synthesis process is simple, the cost is low, the catalytic activity and hydrothermal stability is high, and the light-off temperature and complete combustion temperature of methane are low.

The invention discloses a preparation method of polydopamine modified alginic acid microspheres, which comprises the following steps of: under the protection of nitrogen, grafting dopamine to alginic acid by use of N-hydroxysuccinimide and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride; polymerizing the synthesized dopamine modified alginic acid under the slight alkaline condition to obtain a polydopamine modified alginic acid solution; dropwise adding the polydopamine modified alginic acid solution into a CaCl2 solution by a syringe; and aging to obtain polydopamine modified alginic acid microspheres. The method disclosed by the invention is simple in process, and the prepared modified alginic acid microspheres have higher swelling resistance and good mechanical properties.

The invention discloses a preparation method of a graphene-carbon nanotube-nano tin dioxide three-dimensional composite material, which comprises the following steps: (a) by using deionized water as a solvent, sequentially adding graphene oxide, stannous dichloride and multiwall carbon nanotubes as solutes, and mixing; (b) performing ultrasonic reaction on the mixed solution at 25-40 DEG C under the ultrasonic power of 100-300W for 1-2 hours; and (c) transferring the solution subjected to ultrasonic reaction into a hydrothermal kettle, performing hydrothermal treatment at 120-300 DEG C for 6-72 hours, and slowly cooling to room temperature, thereby obtaining the three-dimensional-structure graphene-carbon nanotube-nano tin dioxide composite material product. The invention also discloses a corresponding product and application thereof. The method disclosed by the invention can be used for preparing the three-dimensional-structure graphene composite material in an economic environment-friendly and convenient-operation mode; and the graphene-carbon nanotube-nano tin dioxide three-dimensional composite material has the characteristics of high specific surface area, porousness, light weight, long cycle life and the like.

The invention discloses a method for utilizing a metal organic skeleton to carry out efficient catalytic activation on persulfate or peroxymonosulfate to process organic wastewater. According to the method, a metal organic skeleton material is used as a catalyst, and the characteristics of high active site and high catalytic activity of the metal organic skeleton are used for carrying out catalytic activation on persulfate or peroxymonosulfate to generate sulfate free redical under a condition of normal temperature to degrade organic pollutants in the organic wastewater. The catalyst is easy in recovering and reusing, the activation effect of the catalyst is still good after the catalyst is reused for multiple times, and the catalyst is an environment-friendly material. The method is suitable for processing various types of organic wastewater, has the advantages of good durability, short catalysis time and convenience in operation, has a good degradation effect within a wide PH (Potential of Hydrogen) range, and has a large application prospect on an aspect of the degradation of water body organic pollutants.

The invention discloses an expandable graphite/polyaniline/cobalt ferrite wave-absorbing material with an anti-electromagnetic interference function and a preparation technology thereof. The invention aims to provide an expandable graphite/polyaniline/cobalt ferrite wave-absorbing material which has strong electromagnetic wave absorbing capability and wide absorption frequency bandwidth and is convenient to use without causing environmental pollution and a preparation technology thereof. According to the invention, the wave-absorbing material consists of paraffin serving as a film forming material and an expandable graphite/polyaniline/cobalt ferrite ternary complex serving as an electromagnetic wave absorbent. The preparation technology of the expandable graphite/polyaniline/cobalt ferrite wave-absorbing material comprises the following steps of: (1) preparing expandable graphite; (2) preparing absolute ethyl alcohol containing expandable graphite; (3) preparing an expandable graphite/polyaniline binary complex; (4) preparing the expandable graphite/polyaniline/cobalt ferrite ternary complex; and (5) weighing the expandable graphite/polyaniline/cobalt ferrite ternary complex and the paraffin, uniformly mixing the expandable graphite/polyaniline/cobalt ferrite ternary complex and the paraffin and performing ball milling to obtain the expandable graphite/polyaniline/cobalt ferrite wave-absorbing material.

The invention discloses a MOF (metal-organic framework) and polyurethane crosslinked membrane as well as a preparation method and an application thereof. Post-synthesis modification is performed on active amino or hydroxyl on MOFs through a polyurethane prepolymer, nanocrystals of the MOFs are linked under the covalent bond function of active amino or hydroxyl and polyurethane prepolymer, so that the compatibility and the acting force between the MOFs particles and a polymer chain are improved, modified MOFs derivatives are endowed with excellent flexibility and a film-forming property, and a new method for preparing MOFs membrane devices is established. The synthesized MOFs membrane material has good selective separation effect on dye molecules in water and has great application prospects in the membrane separation field.

The invention discloses a brightly colorful contact lens which is characterized by being prepared by using a method comprising the following steps of: (1) preparing structural color hydrogel with an inverse opal photon crystal structure by using a sequenced colloid nano particle photon crystal structure as a template through a colloid crystal template method; (2) paving the structural color hydrogel with the inverse opal photon crystal structure in a PV (polyvinyl) mould of the contact lens; adding the contact lens standard hot-solid liquid to completely permeate into the network structure ofthe hydrogel; processing the thermal solidification sequence to form the initial film of the contact lens; immersing the initial film of the contact lens in a standard saline water solution to process hydration treatment until swelling is in equilibrium. Compared with other colored contact lenses, the brightly colorful contact lens is beautiful in appearance, good in biological compatibility and good in practicability.

The invention discloses a chitosan/polylysine in-situ gel and a preparation method thereof. The gel is an in-situ gel prepared from 1-5.5 percent by weight of sulfhydrylization chitosan and 0.1- 3.2 percent by weight of maleimide polylysine. The preparation method comprises the following steps of synthetizing the polylysine containing maleimide double bonds, and preparing a maleimide polylysine solution by taking a PBS (phosphate buffer solution) as a solvent; preparing a sulfhydrylization chitosan solution by taking the PBS as a solvent; and uniformly mixing the two solutions under the condition of physiological pH value to obtain the in-situ gel. The invention has the advantages that the preparation process is simple, and the prepared in-situ gel simulates the components, the structure and the functional characteristics of polysaccharide/polypeptide of a natural extracellular substrate, helps to increase histocompatibility of a material, promotes cell adhesion growth and has wide application prospects in the fields of tissue engineering and drug release.

The invention belongs to the technical field of membranes, and particularly relates to a beta-cyclodextrin modified mesoporous silica ball-polymer hybrid proton exchange membrane and a preparation method thereof. The method comprises the following steps: firstly preparing a beta-cyclodextrin modified mesoporous silica ball with a spherical shell structure; and blending the beta-cyclodextrin modified mesoporous silica ball with a polymer, so as to prepare the proton exchange membrane. According to the proton exchange membrane prepared by the method, organic-inorganic composite particles (beta-cyclodextrin modified mesoporous silica balls) are introduced, the colorless transparent character of the proton exchange membrane is not changed; the proton conductivity of the beta-cyclodextrin modified mesoporous silica ball-polymer hybrid proton exchange membrane is greatly increased in comparison with a pure polymer proton exchange membrane; especially the proton conductivity in high-temperature and/or low-humidity environments is improved exponentially or even by one order of magnitude; and meanwhile, the method disclosed by the invention is mild in preparation condition, low in production cost and easy in large-batch and large-scale production, and has a good industrial production foundation and wide application prospect.

The invention discloses a method for massively preparing high-quality graphene. The method comprises the following steps of mixing a stripping agent and water, preparing a stripping agent solution of which the concentration is 0.2 to 50 weight percent; dispersing expanded graphene into the stripping agent solution in a mass ratio of the expanded graphene to the stripping agent solution of (0.1-10):100, stirring and dipping for 1 to 10h; and performing ultrasonic treatment for 5 to 300 minutes, filtering, washing and drying to obtain the graphene. The method has the advantages that the method is mild in preparation condition and easy to operate, and massive production is easily realized.

The invention discloses a method for manufacturing a solar battery photoanode and a product thereof. The method comprises the following steps of: firstly, coating a photoresist on a monocrystalline silicon wafer and transferring a micro-scale design on a mask through photoetching; secondly, plating a silver film through a film plating process; thirdly, cleaning to remove the photoresist; fourthly, carrying out metal catalytic etching by adopting mixed solution of hydrogen fluoride and H2O2 as an etchant to form a microcolumn or micropore structure; fifthly, cleaning the metallic silver film remained on the monocrystalline silicon wafer; sixthly, carrying out metal catalytic etching again by adopting mixed solution of hydrogen fluoride and AgNO3 as an etchant to form a nanometer line structure; and seventhly, cleaning the silicon wafer, removing silver formed and remained on the surface of the silicon wafer during the second etching process. According to the invention, a micro-nanometer structure combined with a manometer line and a micropore or a microcolumn array can be obtained; and the method disclosed by the invention has the characteristics of high efficiency and low cost andis suitable for the batch production of solar batteries.

The invention relates to a high-heat-conductivity fluorine-containing resin based prepreg and a copper-clad plate prepared with the same. By introduction of a coupling agent modified inorganic nano supporting material into high-heat-conductivity inorganic filler, compatibility of the high-heat-conductivity inorganic filler to a fluorine-containing resin matrix is improved, and gathering of the high-heat-conductivity inorganic filler in a resin matrix is inhibited while heat conductivity of fluorine-containing resin is increased. The prepreg prepared by steps of impregnating glass fibers in dispersion liquid of the fluorine-containing resin mixture, drying and the like is high in heat conductivity, uniform in resin content, high in impregnation quality, high in resin adhesion, high in surface smoothness and appropriate in toughness and viscosity. The copper-clad plate prepared with the high-heat-conductivity fluorine-containing resin based prepreg is high in transverse heat conductivity, excellent in heat and mechanical property and dielectric property and high in copper foil peel strength and weather resistance, meets the requirement of high-power devices on quick transverse heat dissipation and accords with requirements on various comprehensive performances of substrate materials in the field of high-frequency communication.

The present invention provides a method for preparing hollow polymer nanofibers by using a coaxial electrospinning technology. The method comprises the following steps: 1) adopting glycerol or a mixture of glycerol and water as an inner phase electrospinning liquid of coaxial electrospinning; 2) adopting a polymer solution as an outer phase electrospinning liquid; 3) respectively connecting the inner phase electrospinning liquid and the outer phase electrospinning liquid to a liquid inlet of a coaxial electrospinning nozzle; 4) controlling flow rates of the inner phase electrospinning liquid and the outer phase electrospinning liquid, and carrying out coaxial electrospinning to obtain the hollow polymer nanofibers on a receiving plate. Compared with the existing preparation technology, the preparation method of the present invention has the following advantages that: the liquid glycerol is adopted as the inner phase electrospinning liquid so as to prepare the hollow nanofibers through a one-step method, such that the preparation process is simple; the glycerol provides good biocompatibility for most of bioactive macromolecules, and bioactive substances such as biological enzymes and the like are added to the inner phase electrospinning liquid, such that efficient in-situ loading of the bioactive substances in the hollow nanofiber cavity can be achieved.

The invention discloses a carbon composite material. The carbon composite material comprises 0.1-35wt% of a carbon nanomaterial and 99.9-65wt% of amorphous carbon with a high surface area; the carbon nanometer is one or a mixture of more of carbon nanotubes, carbon fibers, graphene oxide and graphene; and the specific surface area, the pore volume and the conductivity of the composite material are not lower than 800m<2>/g, not lower than 0.3cm<3> and not lower than 4S/cm respectively, and the aperture of the composite material is 0.5-10nm. The carbon composite material has the respective characteristics of the carbon nanomaterial and the amorphous carbon, realizes the organic combination of the carbon nanomaterial and the amorphous carbon in functions, has high surface area and high conductivity, and can provide superior capacity and rate performance as an excellent electrode and conductive material of super capacitors, lithium ion capacitors, fuel batteries and lead carbon battery electrodes. The carbon composite material can remove impurities in water as an electrode material in water treatment devices.

This invention describes a process for preparing high-purity nanoscale polyalumina sols. This invention uses active aluminum hydroxide and industrial hydrochloric acid as raw materials, and adopts a two-stage reverse stripping process to produce a solution of polyaluminum chloride with an alkalinity higher than 50%, which is then increased to 70% or higher using high-purity calcium aluminate as the alkalizer. The process ensures complete stripping of the aluminum hydroxide raw material at normal atmosphere and a low temperature, thus obtaining a high-purity product. In addition, in the produced polyaluminum chloride sols the total content of nanoscale Al13 and Al30 having Keggin structure is higher than 70%, the alkalinity is 70-85% and the aluminum concentration is 10-19% (measured as Al2O3). The product is widely used as raw material for modern fine chemical binders, gluing agent for neutral paper manufacturing, intermediate or additive for modern pharmaceutical technology, coupling agent and catalyst for chemical production and flocculant for water treatment, and has potential applications in such emerging fields as inorganic nanocomposites and inorganic membrane materials.