51results about How to "Overcome the disadvantages of easy reunion" patented technology

The invention belongs to the technical field of coating and particularly relates to a thermal insulation coating with excellent thermal insulation performance, water resistant performance, weather fastness and mechanical property and a preparation method thereof. The method comprises the following steps: loading rutile nano-titanium dioxide on the surface of the attapulgite to obtain the titanium dioxide / attapulgite nanocomposite material, organically modifying through a silane coupling agent and carboxylic acid, copdymerizing with styrene and acrylic monomer to prepare the modified styrene-acrylic emulsion, and adding micron titanium dioxide, glass bead, far infrared ceramic powder, a moist disperser, a defoamer, a coalescing agent and water to obtain the thermal insulation coating with excellent thermal insulation performance, water resistant performance, weather fastness and ultraviolet resistance ability.

The invention discloses preparation and application of a cobalt and nitrogen co-doped porous carbon microsphere material. The cobalt and nitrogen co-doped porous carbon microsphere material disclosed by the invention is used for the cathodic oxygen reduction reaction electrocatalyst of a fuel cell. Sodium alginate, cobalt-nitrate hexahydrate and 2-methylimidazole are used as the raw materials of the cobalt and nitrogen co-doped porous carbon microsphere material. The preparation method comprises the steps of: preparing hydrogel microspheres from sodium alginate solution through an electronic injection method, taking cobalt nitrate solution as receiving solution, dipping the microspheres for 12 h, so that sufficient ion exchange of cobalt ions and sodium ions is carried out, freezing and drying after respectively washing by using absolute ethyl alcohol and deionized water for two times, then, putting the microspheres in 2-methylimidazole methanol solution to perform room-temperature reaction for 12 h, then, respectively washing by using absolute ethyl alcohol and deionized water for several times, freezing and drying, and carbonizing through a tube furnace to obtain the cobalt and nitrogen co-doped porous carbon microsphere material. Preparation in the invention is simple in process, green and environment-friendly; and furthermore, the prepared carbon microsphere material has good electro-catalytic property, and has important value and meanings in the field of heteroatom doped carbon-based oxygen reduction electrocatalysts.

The invention provides a preparation method, a product and application of a nitrogen-doped axial carbon fiber / graphene loaded cobalt nano electrocatalyst, cellulose and a nitrogen source are taken asraw materials, a graphene fiber axial composite nitrogen-doped graphene lamellar structure is formed by high-temperature in-situ carbonization, and meanwhile, Co nano particles are loaded to obtain aMott-Schettky heterojunction. The method is simple in process, easy to control, green and safe, and can realize macro preparation. The nitrogen-doped axial carbon fiber / graphene loaded cobalt nano electrocatalyst prepared by the invention has relatively high catalytic activity, and shows relatively high electrocatalytic hydrogen production rate at different scanning rates.

The invention provides a preparation method of a micro-extraction / micro electrode bifunctional probe and belongs to the field of biological signal molecule detection. In the micro-extraction / micro electrode bifunctional probe, a carbon nanofiber (CNFs) / carbon fiber (CF) has high adsorption activity, and micro-extraction and micro electrodes are integrated. As magnetic nanoparticles Fe3O4 are modified on the surface of CNFs, not only is the defect that the magnetic nanoparticles Fe3O4 are liable to aggregate overcome, but also the magnetic response property of the CF is improved. By regulatingand controlling movement routes of Fe3O4 / CNFs / CF through magnetic fields, magnetic navigation is achieved, and through electrochemical signal variations of Fe3O4 / CNFs / CF, precise positioning of signalmolecule release sites is achieved; due to bidirectional regulation and control of magnetic fields and electric signals, a novel detection method for cell signal molecule positioning quantitative analysis is provided, and essential theoretic instructions can be provided to design novel efficient cell analyzers later.

The invention belongs to the field of material preparation and environment, and particularly relates to a metal-loaded covalent organic framework composite material, and a preparation method and application thereof. The composite material is prepared from the following components: metal nanoparticles and TpMA. The preparation method comprises the following steps: mixing TpMA, chloroauric acid and methanol; and then adding sodium borohydride, and reacting to obtain the product. The metal nanoparticle loaded covalent organic framework material prepared by the invention is a novel heterogeneous catalyst which is simple to prepare, green and efficient, has high catalytic activity, high degradation rate and short time, and can catalytically reduce high-concentration pollutants.

The invention discloses an aluminum oxide modified multiwalled carbon nanotube nano composite material as well as a preparation method and application thereof. The aluminum oxide modified multiwalled carbon nanotube nano composite material comprises nano aluminum oxide and multiwalled carbon nanotubes, wherein the nano aluminum oxide is loaded on the multiwalled carbon nanotubes to commonly form a net-shaped structure; and the mass percent content of the multiwalled carbon nanotubes in the aluminum oxide modified multiwalled carbon nanotube nano composite material is 40%-50%. The preparation method comprises the following steps: acidifying, loading of aluminum oxide and sintering. The aluminum oxide modified multiwalled carbon nanotube nano composite material has a nano-grade size and has the characteristics that the hydrophily is good, the material is easy to stably disperse in a water solution and a plurality of active radicals exist on the surface, so that the aluminum oxide modified multiwalled carbon nanotube nano composite material has the advantages of large adsorption capacity and high adsorption efficiency; and heavy metal cadmium and an organic matter trichloroethylene in a water body can be efficiently removed.

The invention discloses a sulfur-doped nano ferric oxide / biochar composite material, a preparation method thereof and an application thereof in remediation of heavy metal arsenic and / or lead polluted soil. Wherein, the composite material is loaded with sulfur-doped nano ferric oxide on the biochar carrier; the biomass raw materials used to prepare the biochar carrier include agricultural waste. The preparation process of the sulfur-doped nano-Fe3O4 / biochar composite material of the present invention combines solid loading and vulcanization modification at the same time, so that the material has high-efficiency adsorption performance, reduction performance and recovery potential, and can simultaneously efficiently remove the sulfur in the soil. Arsenic and lead contamination purposes. The present invention not only makes up for the limitation of simply using biochar and nano-iron materials, but also solves the problem that it is difficult to efficiently remove arsenic pollution in the form of anions and lead pollution in the form of cations in the actual soil remediation process. Application prospect.

The invention relates to preparation of a core-shell ultraviolet fluorescence molecularly-imprinted material and application of the material in sulfanilamide detection. By using sulfamethyldiazine as a template molecule, the synthesized lysine-based fluorescence molecule as the functional monomer, ethylene glycol dimethyl acrylate as a crosslinking agent and azodiisobutyronitrile as an initiator, the lysine-framework fluorescence functional monomer with FMOC fluorophore is subjected to surface polymerization to obtain an about 10nm imprinted layer on the monodisperse methylacryloylated silicon ball surface with the diameter of 100nm. A Soxhlet method is utilized to remove the imprinted template molecule in the material to obtain the fluorescence molecularly-imprinted sensing material with fluorescence quenching responsiveness to the template molecule; the molecularly-imprinted material has the advantages of favorable dispersity, high response speed and stable optical properties, and is applicable to determining the sulfamethyldiazine content in the marked milk; and the method can indirectly convert the ultraviolet absorption signal of the analyte into a sensitive fluorescence signal, thereby enhancing the detection sensitivity and obtaining favorable recovery rate.

The invention discloses a method for preparing silicon quantum dots in nano titanium dioxide under the assistance of ion implantation and ion bean sputtering. The method comprises the following steps: washing a substrate and a target material and then placing in a sputtering chamber; carrying out pre-sputtering and washing in vacuum under the protective condition of argon; sputtering titanium dioxide with an argon ion beam with certain projected current and voltage, and thus depositing a titanium dioxide film on the substrate; annealing so as to obtain a nano titanium dioxide film; carrying out silicon ion implantation three times at certain energy and implantation dosage so as to obtain silicon doped titanium dioxide film; and annealing so as to obtain the silicon quantum dot doped nano titanium dioxide film. The method has the advantages that method is simple, and conditions are mild; the content, size, morphology and distribution of the silicon quantum dots can be freely regulated through regulating an ion implantation process; and the defect that the quantum dots are easy to agglomerate when in implantation is overcome, thereby regulating the light absorbing characteristic of the doped titanium dioxide film.

The invention relates to an MnO2-doped composite magnetic nanometer adsorbent, its preparation method and its application. The adsorbent comprises a ferric salt, a ferrous salt, and a divalent manganese salt, wherein the mole ratio of the ferric salt to the ferrous salt to the divalent manganese salt is 2:(0.5-3.0):(0.02-0.6). The adsorbent prepared in the invention has a large specific surface area and a good adsorption performance, and can be used for removing pollutants in sewage, such as arsenic (especially trivalent arsenic), and the adsorbent adsorbing the pollutants can be separated and recovered through a magnetic separation process. The adsorbent has the advantages of simple technology, convenient operation, easy material recovery, and recycle realization.

The invention provides a preparation method of a micro-extraction / micro electrode bifunctional probe and belongs to the field of biological signal molecule detection. In the micro-extraction / micro electrode bifunctional probe, a carbon nanofiber (CNFs) / carbon fiber (CF) has high adsorption activity, and micro-extraction and micro electrodes are integrated. As magnetic nanoparticles Fe3O4 are modified on the surface of CNFs, not only is the defect that the magnetic nanoparticles Fe3O4 are liable to aggregate overcome, but also the magnetic response property of the CF is improved. By regulatingand controlling movement routes of Fe3O4 / CNFs / CF through magnetic fields, magnetic navigation is achieved, and through electrochemical signal variations of Fe3O4 / CNFs / CF, precise positioning of signalmolecule release sites is achieved; due to bidirectional regulation and control of magnetic fields and electric signals, a novel detection method for cell signal molecule positioning quantitative analysis is provided, and essential theoretic instructions can be provided to design novel efficient cell analyzers later.