72 results about "Cation exchange reaction" patented technology

This invention discloses a method for synthesizing organic-inorganic bentonite composite. The method comprises: utilizing bentonite as the main material, performing inorganic modification through cation-exchange reaction by using hydroxyl aluminum aqueous solution, torrefying to obtain hydroxyl-containing aluminum-pillared bentonite with high porosity and high specific surface area, and reacting between the hydroxyls and silylation agent to graft silane groups onto aluminum-pillared bentonite and obtain organic-inorganic bentonite composite. The organic-inorganic bentonite composite has both the advantages of inorganic pillared bentonite such as high porosity and high specific surface area, and those of organic bentonite such as high organic carbon content and high hydrophobicity thus can be used to treat organic waste gases and wastewater with a good effect by surface adsorption as well as distribution.

The present invention discloses composite organic-inorganic bentonite material and its synthesis process. The present invention prepares composite organic-inorganic bentonite material with bentonite as the main material, and through cation exchange reaction with the water solution of polyhydroxy aluminum for inorganic modification of bentonite, roasting to obtain aluminum pillared interlayer bentonite with high porosity, great specific surface area and reactive hydroxyl radical, and the final silanizing reaction to graft silane radical containing organic radical onto the aluminum pillared interlayer bentonite to obtain the composite organic-inorganic bentonite material. The composite organic-inorganic bentonite material features high porosity, great specific surface area, high organic carbon content and high hydrophobicity.

A liquid rubber adhesive containing montmorillonite nanoparticles with high T-type stripping strength and adhesion is prepared through cationic exchange reaction of montmorillonite, intercalation combining with hydroxy terminated polybutanediene liquid rubber, and cross-linking by toluene diisocyanate (TDI) to obtain nano-montmorillonite/polyurethane/hydroxy terminated polybutanediene liquid rubber adhesive.

The invention discloses a preparation method of a polyacrylic acid-humic acid-rectorite composite adsorbing agent, which adopts organic quaternary ammonium salt and rectorite to generate a cation exchange reaction to form organic rectorite, then enables the crylic acid to conduct in-situ polymerization on a nanometer interlayer of the organic rectorite to form an intercalation polymer/ clay composite material, simultaneously loads the humic acid, and prepares the polyacrylic acid-humic acid-rectorite composite adsorbing agent. The preparation method takes full advantage of the rectorite and the humic acid on excellent adsorbability of polycyclic aromatic hydrocarbon and high-efficient adsorbability of polyacrylic acid on heavy metal, enables the adsorbing agent to simultaneously adsorbing the heavy metal and the polycyclic aromatic hydrocarbon, and simultaneously expresses the superiority of the polyacrylic resin on rate of adsorption. The adsorbing agent is high in adsorption efficiency of the heavy metal and the polycyclic aromatic hydrocarbon, and rapid in adsorption speed of the heavy metal and the polycyclic aromatic hydrocarbon.

The invention discloses a biological sensor based on CuS nano-particle cation exchange enhanced chemiluminescence. Copper sulphide nano-particles are marked on biological molecules, and a composite structure marked with copper sulphide is obtained through a biological identification function; silver nitrate is added into a system, cation exchange reaction on silver nitrate and copper sulfide nano-particles is instantly carried out so as to generate copper ions; a target is quantitatively detected by utilizing chemiluminescence caused by catalyzing a luminol-hydrogen oxide system by the generated copper ions.

The present invention relates to an antibacterial artificial tooth root with bioactivity and a preparation method thereof. The antibacterial artificial tooth root consists of pure titanium-made or titanium alloy-made artificial tooth root base and a microcellular sodium titanate bioactive layer loaded with microelement of silver and bone morphogenetic protein (BMP). The sodium titanate bioactive layer with microcellular is combined with the surface of metal base, and is formed by alternately piling the microcellular structures of sodium titanate which is prepared by the hydrothermal reaction of titanium-made or titanium alloy-made base surface and sodium hydroxide solution. The silver takes cation exchange reaction with sodium to be doped in the layer and the BMP is combined in the microcellular structures by centrifugal force and capillary action. The preparation method is as follows: processing an artificial tooth root made of pure titanium or titanium alloy firstly, preparing a sodium titanate bioactive layer with microcellular structure on the surface of artificial tooth root through the technique of hydrothermal synthesis in alkali solution, then doping silver in the microcellular sodium titanate layer by ion exchange reaction in solution, and finally loading with the BMP in the microcellular sodium titanate layer adoped with silver through the technique of centrifugal load.

The invention provides a method for improving the water resistance of ammonium polyphosphate. The method comprises the following steps of: (1) performing a cation exchange reaction on a chain extension crosslinking agent and the ammonium polyphosphate in a water-containing medium, wherein the chain extension crosslinking agent provides bivalent and/or bivalence higher cations for the cation exchange reaction with NH<4+>; and (2) performing solid and liquid separation on a reaction product so as to obtain solid modified ammonium polyphosphate. In the method, the cations of the chain extension crosslinking agent undergoes the cation exchange reaction with the NH<4+> ionized from an ammonium polyphosphate liquid phase, so that chain growth and crosslinking of the ammonium polyphosphate are realized and the aim of reducing the water solubility of the ammonium polyphosphate is fulfilled. Compared with a solid-phase method for modifying the ammonium polyphosphate, the method of the invention has the advantages of mild reaction condition, uniformly controllable quality of the modified ammonium polyphosphate, low requirement on equipment condition, simpleness, easy operation and the like.

The invention belongs to the technical field of electrocatalysis, and specifically relates to a preparation method of a non-noble metal NiCoFe/NF electrocatalyst and application of the electrocatalyst to oxygen evolution. The catalyst is mainly prepared by a hydrothermal reaction and a metal cation exchange reaction at room temperature in two steps, wherein in the first step, Ni-doped Co-MOF is grown on foam nickle in situ as a precursor for the next step of reaction; in the second step, obtained NiCo/NFis immersed in an aqueous solution containing ferrous sulfate, and after drying, the NiCoFe/NF catalyst is obtained. The catalyst obtained by the method can achieve the electric current density of 10 mA/cm<2> with only 252 mV of overpotential, has excellent long-term stability at the same time, and has higher oxygen evolution activity compared with other traditional non-noble metal catalysts. The preparation method involved in the invention is simple; raw materials are abundant and easy to get; large-scale production potential is realized.

The present invention a nanometer polyurethane elastomer/montmorillonite composite material and its preparation process. The nanometer polyurethane elastomer/montmorillonite composite material consists of polyurethane elastomer, bulking agent, organic montmorillonite and functional antiaging agent. The preparation process includes after cationic exchange reaction of montmorillonite, melting insertion of bulking agent, and bulking polyurethane elastomer and organic montmorillonite by means of the bulking agent. The material has montmorillonite dispersed homogeneously in the polymer and obviously higher mechanical performance than pure polyurethane elastomer.

The invention relates to a ball milling method for preparing organic vermiculite with large layer distance. The method comprises the following steps of: performing cooperative processing on vermiculite from Yuli County in Xinjiang Province serving as a raw material by using sodium chloride and hydrochloric acid to prepare sodium-modified vermiculite of which the cation exchange capacity and the homogeneity are high; and driving positive ions of ammonium salt to enter an interlayer by using mechanical energy produced by ball milling so as to perform a cation exchange reaction by taking cetyl trimethyl ammonium bromide as an intercalator to prepare the organic vermiculite with the large layer distance, wherein the layer distance of the organic vermiculite is between 4.936 and 5.243 nanometers; and organic vermiculite powder has high bulk density. The organic vermiculite has good application prospect when used as a catalyst carrier and an efficient organism adsorbent. The ball milling method related by the invention has universal applicability to other alkyl ammonium salt modified vermiculite. Simultaneously, the preparation method has high consistency and repeatability.

The invention relates to the field of paint, in particular to an organic montmorillonite modified polyurethane acrylic electrophoretic resin and electrophoretic paint. Hydroxy-terminated cation waterborne polyurethane resin is prepared, and is in exchange reaction with Na-montmorillonite cation to obtain organic montmorillonite, the generated organic montmorillonite and polyether polyol are in melt intercalation, and then are in step-by-step polymerization reaction with isocyanate and a chain extender, generated polymer macromolecules effectively enlarge the interlayer spacing of the montmorillonite, and is in a nanoscale disperse state in polymer substrate, and after the reaction is finished, acid is added to neutralize nitrogen atoms on a polyurethane molecule main chain to generate ammonium ions so as to obtain the polyurethane nano hybrid resin. The prepared polyurethane nano hybrid resin is mixed with terminal blocked type HDI tripolymer, the mixture is subjected to strong shearing and emulsification to be dispersed in water so as to obtain the water-based polyurethane electrophoretic paint; the water-based polyurethane electrophoretic paint is formed into film through an electrophoretic process. The brightness fullness of the electrophoretic paint is greater than 90, the hardness is greater than 4H, the water resistance is greater than 1,000 h, and the acid resistance is greater than 30 h.

The invention relates to a preparation method of cetyl trimethyl ammonium bromide modified montmorillonite. According to the preparation method, sodium-based montmorillonite is taken as a raw material, the montmorillonite and water are first mixed according to a certain proportion, and after the montmorillonite is expanded by a large amount of water, a sol is formed and a Tyndall phenomenon is generated, wherein colloidal particles in the sol are all nano-sheets or nano-particles, and nanocrystallization is realized; then hexadecyl trimethyl ammonium bromide is taken as an intercalation agent,and the cetyl trimethyl ammonium bromide is intercalated into stripped nano sodium montmorillonite layers through a cation exchange reaction by mechanical stirring, so that the cetyl trimethyl ammonium bromide modified montmorillonite is obtained. According to the preparation method, the adopted raw materials are few and have low prices, operation is simple, production cost is low, performance such as mechanical strength, gas barrier property, hydrophobicity and the like of the montmorillonite are greatly improved, and the prepared organic montmorillonite can be widely used as a corrosion inhibitor in the field of corrosion prevention.

The present invention provides one kind of nano level catalyst carrier for polyolefin and its preparation process. Laminated silicate through cationic resin exchange reaction processing is made to compound with amine molecule and silica precursor to obtain composition, and the composition is roasted and palletized to prepare the catalyst carrier with specific surface area over 200 sq m/g and pore size of 2-5 nm. The carrier has the features of high titanium carrying amount, large pore size and containing no chlorine element. The carrier is used to load titanium tetrachloride, alkoxy titanium or other catalyst before used together with alkyl aluminum system in the polymerization of propylene or ethylene and has the characteristic of in-situ producing nano composite polyolefin material in one step.

The invention relates to a biological analysis method based on quantum dot selective recognition reaction and application thereof. The method comprises the steps of selectively recognizing Cu <2+> anda DNA template Cu NPs based on QDs to obtain the change of a QDs fluorescence signal, and obtaining the analysis result of a target object based on a nucleic acid chain based on the change of the QDsfluorescence signal. Therefore, the selective cation exchange reaction based on the QDs is introduced through the DNA template Cu NPs, the DNA template Cu NPs-QDs can be used as signal molecules, andthe analysis sensitivity can be effectively improved in the biological analysis and detection process. The method can be widely applied to the field of detection and analysis of nucleic acid strand-based targets.

The invention discloses porous nanosheet based NiCo2O4 nanotubes applied to high-effective carbon soot catalytic elimination. The porous nanosheet based NiCo2O4 nanotubes include one-dimensional hollow tubes and ultrathin nanosheets growing on the tube walls. Through simple hydrothermal reaction with cobalt based nanowires being a template, the CoNi-Asp nanosheet based nanotubes are prepared through self-diffusion of Kirkendall effect and further a cation exchange reaction with nickel ions, then annealing reaction is carried to obtain the product. The Hierarchical porous nanosheet based NiCo2O4 nanotubes have an opened structure and hollowed interior and are in a hierarchical porous structure, have more active sites, have stable structure, and have significant advantage in carbon soot co-elimination.

The invention belongs to the technical field of lithium-sulfur batteries, and particularly relates to a preparation method of a layered double hydroxide composite material for a positive electrode of a lithium-sulfur battery. The preparation method of the layered double hydroxide composite material for the positive electrode of the lithium-sulfur battery comprises the following steps: (1) synthesizing AC-FeCoNi; and (2) synthesizing Cu SAs/AC-FeCoNi. Copper atoms are introduced into AC-FeCoNi through an in-situ cation exchange reaction to prepare the Cu SAs/AC-FeCoNi composite material, and the preparation method is simple, effective and easy to operate; and the prepared composite material has high conductivity and high specific surface area, and has a stable three-dimensional structure.

A catalyst carrier carrying TiCl4 or alkoxytitanium for polymerizing ethene or propene to obtain polyolefin nanoparticles by one step is prepared through mixing cation-exchange treated laminar silicate, amine and precursor of silicon oxide, introducing Mg(OR)2 to the gap between its layers, and calcining. Its advantages are high catalytic activity, high mechanical performance and high adhesion to active component.

The invention relates to an antibody modified ZnSe nanocrystalline based kit for detection of the hepatocellular carcinoma marker GPC3 (glypican-3). The kit mainly includes: a ZnSe nanocrystalline antibody with a GPC3 antibody crosslinking modified surface, a zinc ion fluorescent probe solution, a GPC3 antibody and a GPC3 protein standard substance. The kit provided by the invention combines a double-antibody sandwich immunoassay method and cation exchange reaction of ZnSe nanocrystalline, realizes amplification of the GPC3 detection signal in immunoreaction, has the advantages of stable signal, high sensitivity, low detection limit and the like in detection of hepatocellular carcinoma marker GPC3, and can be used for early diagnosis of hepatocellular carcinoma patients.

The invention discloses a modified ammonium polyphosphate intumescent flame retardant as well as a preparation method and application thereof. The chemically modified ammonium polyphosphate is prepared by carrying out cation exchange reaction on ammonium ions (NH4 +) of ammonium polyphosphate and amino groups (-NH2) of an amino group-containing silane coupling agent in a mixed solution of a sodium hydroxide aqueous solution and polyol, and a new silane coupling agent modification mode is created; silicon hydroxyl is introduced through modification, so that the condensed phase flame-retardant effect is improved; the flame retardant can be independently used as an intumescent flame retardant to be applied to a high polymer material, and is low in consumption and good in flame retardant effect due to the gas-phase flame retardance of the raw materials. The reaction is simple and easy to control, synthesis preparation is convenient, and industrialization is easy.

The invention relates to an HIV p24 high-sensitivity detection method based on a quantum dot selective cation exchange reaction. The HIV p24 high-sensitivity detection method comprises the following steps: preparing an anti-p24-detection antibody-biotin sandwich compound by adopting a recognition antibody, a to-be-detected sample and a detection antibody; connecting the anti-p24-detection antibody-biotin sandwich compound with streptavidin-alkaline phosphatase to obtain an anti-p24-detection antibody- ALP compound; and adding vitamin C-2-phosphate into the anti-p24-detection antibody-ALP compound for incubation, then adding a silver nitrate solution for a reaction, adding a quantum dot stock solution for the reaction, analyzing fluorescence signals, and acquiring a detection result. A light-emitting quantum dot selective cation exchange reaction signal amplification technology is introduced so that analysis sensitivity is improved; the color of the light-emitting quantum dots is in a visible light range so that visual analysis of human eyes is easy to realize; and the fluorescence analysis sensitivity is high, a sample demand is low, an anti-interference capability is high, an analysis speed is high, and the miniaturized fluorophotometer is convenient to carry.

The invention discloses a method for controlling PbS or PbSe quantum dot size distribution. The method comprises the following steps that: (1) first, CdSe (or CdS) quantum dots with larger sizes are injected into a precursor of lead, and PbSe (or PbS) quantum dots with larger sizes are obtained through a cation exchange reaction at the moment; (2) then, CdSe (or CdS) quantum dots with smaller sizes are continuously injected, and the PbSe (or PbS) quantum dots with smaller sizes are obtained through the cation exchange reaction at the moment; (3) finally, the size distribution of the PbSe (or PbS) quantum dots becomes narrower and narrower under the action of Ostwald ripening effect, so that the size distribution of the PbSe (or PbS) quantum dots is controlled. Through the method, various sizes of the PbSe (or PbS) quantum dots with extremely good size distribution can be obtained; moreover, the PbSe (or PbS) quantum dots are specifically stable in air; the method is low in cost, easy to operate, and not strict in environment requirement.

The invention discloses a method for preparing a magic number cluster nanocrystal in an indirect mode of ion exchange. The method comprises the following steps: respectively employing a conventional induction period intermediate before conventional nanocrystalline nucleation, which is formed by a compound containing IIB group, IIIA group or IVA group metal elements in a periodic table of elementsand non-metal elements containing VIA group or VA group as raw materials, as a raw material A; employing a compound of another metal element different from the metal element contained in the raw material A in the IIB group, the IIIA group or the IVA group in the periodic table of elements is mixed with an organic ligand to react to obtain a product, which is used as a raw material B; carrying outcation exchange reaction at room temperature, and then growing the cluster nanocrystal in a dispersing agent, so as to obtain a magic number cluster nanocrystalline product in a new composition form after the metal elements in the raw material A are replaced by the metal elements in the raw material B. The method is simple to operate, the magic cluster nanocrystalline product with narrow size distribution can be obtained at room temperature, and the conversion yield and stability of the method are far superior to those of a traditional direct synthesis mode.

The invention provides a gold-lead sulfide core-shell nanorod photodetector and a preparation method thereof. Gold-lead sulfide core-shell nanorods (Au-PbS NRs) with good crystallinity are prepared through a three-step cation replacement method. The growth process of a shell layer includes the following three steps that: 1, a layer of silver is grown around the gold nanorods; 2, silver sulfide isgenerated through a vulcanization reaction; and 3, a lead sulfide shell layer is prepared through a cation exchange reaction. A field effect phototransistor-based Au-PbS NRs photodetector is preparedthrough a liquid phase spin coating technology. The gold nanorods and the lead sulfide semiconductor are combined, so that the performance of the device is enhanced, and therefore, the device is morestable, easy to operate and can be used in a large range. The detection performance such as quantum efficiency, responsivity and detection rate of the specially prepared photodetector is improved several times, and the improvement of the detection performance of the photodetector in a near-infrared band can be also realized. The preparation method has the advantages of simplicity, easiness in operation, rapidness, low cost, capability of realizing large-area production, and the like.

A method for preparing sodium columbate nanowire by cation exchange approach belongs to the field of functional materials. The method comprises the following steps: mixing SnNb2O6 nanosheet powder asa raw material with deionized water, adding sodium hydroxide and blending to obtain paste, adding ethene diamine and conducting mixed solvent thermal treatment of the above mixture, and carrying out acation exchange reaction to prepare a thermostable Na6Nb8O25.9H2O nanowire material. The Na6Nb8O25.9H2O nanowire has a good application prospect in the field of nanometer devices.