81 results about "Drop coating" patented technology

The invention provides a liquid crystal sealant and a liquid crystal display unit using the same. The liquid crystal sealant is used in a liquid crystal dripping method and the liquid crystal doses not embed into the sealant and the viscosity is below 100Pa.s and the coating performance is excellent in any one of the glue-dropping coating and the silk-screen printing coating. The liquid crystal sealant comprises: (a) a silicon rubber powder and (d) a light-cured resin, wherein the viscosity measured by an E type viscometer at the temperature below 25 DEG C is below 100Pa.s.

The invention relates to a packaging method for a metal oxide semiconductor thin-film transistor. The thin-film transistor is packaged through a solution process. After the conventional preparation process of the metal oxide semiconductor thin-film transistor, device protection layers are prepared on the metal oxide active layer, the source electrode and the drain electrode of the thin-film transistor by adopting a spin-coating, spray-coating, drop-coating, screen-printing or puling method, and annealing is conducted after films are formed. The packaging method for the metal oxide semiconductor thin-film transistor has the advantages that the metal oxide active layer is not damaged, the stability of the device is improved, the electrical properties of the device are not damaged, at the same time the packaging cost is saved and the method is suitable for packaging the metal oxide semiconductor thin-film transistor prepared on a flexible substrate.

The invention provides a preparation method of an electrochemical sensor for detecting heavy metal ions. The preparation method includes the following steps: 1) performing carboxyl functionalization to multi-wall carbon nano-tubes and performing in-situ synthesis with zirconium chloride and 2-aminoterephthalatic acid to prepare an MWCNTs@UiO-66-NH2 composite material; 2) dispersing the MWCNTs@UiO-66-NH2 composite material in N,N-dimethylformamide to prepare a suspension liquid, drop-coating a surface of a glass carbon electrode with the suspension liquid until the surface of the glass carbon electrode is completely covered thereby, and drying the glass carbon electrode in a drying device at room temperature to prepare the MWCNTs@UiO-66-NH2 composite material electrochemical sensor. The electrochemical sensor can achieve ultrasensitive detection on a sample. By an analysis method in the invention, an accurate analytic result can be acquired.

The apparatus of the present invention for forming a coating film on a substrate by applying a coating liquid to the substrate comprises: a spin chuck for holding the substrate; a motor for rotating the spin chuck; and a nozzle for dropping the coating liquid on the center surface of the substrate. The nozzle included a spiral groove or a plurality of fins for giving a gyrating force to the dropped coating liquid.

The invention discloses a three-dimensional conductive network-supported porous silicon nanomaterial and a preparation method and an application thereof. The three-dimensional conductive network-supported porous silicon nanomaterial is prepared by directly compounding a porous silicon nanomaterial converted from silica fume generated in the process of industrially smelting alloys of silicon metal, iron-silicon and the like and a conductive nanomaterial through filtering, spin-coating, drop-coating and / or spraying methods. The preparation method disclosed by the invention is low in cost, simple in process, low in energy consumption and large in scale; and the three-dimensional conductive network-supported porous silicon nanomaterial can be directly used as a negative electrode of a binderless lithium-ion battery and high in charge-discharge specific capacity and cycling stability.

The invention belongs to the field of material science and specifically relates to a preparation method for multi-element heterogeneous asymmetric particles. A polymer mask layer, such as polystyrene, is prepared according to a spinning and dropping coating method; repeated plasma etching and functional decorating are utilized to decorate different areas on the surfaces of silicon dioxide particles with different fluorescent quantum dots or metal nanometer particles, so that the multi-element asymmetric particles are obtained; the size of the decorated areas is controllable; no complex operation is adopted in the whole process; the expensive or difficultly obtained reagent is unnecessary; and the obtained asymmetric particles are high in stability. Meanwhile, polymers, such as the polystyrene, are taken as the mask layer, and the physical controllable deposition and the chemical deposition reaction are combined and utilized to obtain the multi-element asymmetric particles with gold on one side, silver in the middle and silicon dioxide in the other areas. The multi-element asymmetric particles prepared according to the method provided by the invention have significance in both scientific research and practical application.

The invention discloses a wall painting device. The wall painting device comprises a base platform, a moving wheel and a push rod, the moving wheel is arranged at the lower end of the base platform, the left side of the base platform is provided with the push rod, the central portion of the upper end of the push rod is provided with a control switch, an installation groove is formed in the front side of the base platform, and a groove plate is arranged at an opening of the installation groove. The wall painting device has the advantages that the deposition phenomenon of coating in the bottom end of the inner portion of a stirring box by a stirring part and a scraper can be effectively avoided, so that the painting work is achieved; the wall painting device is convenient to assemble and disassemble by a sectional guide pillar and a sliding rod, so that the transportation and use of the device is convenient; a lifting motor is used for driving a lifting frame to move up and down, so thata painting mechanism can quickly paint the wall, and the efficiency of painting and the quality of painting are greatly improved; a collection hood can effectively collect the dropped coating, so that the coating is prevented from falling randomly, and at the same time the coating can be saved; and the device is simple in operation, the number of painting workers can be reduced, and the labor cost is reduced.

The invention discloses a metal-organic framework nano-sheet composite film, a preparation method and an application thereof. The preparation method of the metal-organic framework nano-sheet composite film comprises the following steps: dissolving metal-organic framework particles in an organic solvent or an aqueous solution thereof, and carrying out a plurality of alternating freezing-high-temperature treatment to obtain a stripped nano-sheet dispersion; taking a high molecular polymer film as a substrate, modifying the substrate by ammoniation or hydroxylation to obtain a modified substrate; then, uniformly spreading the metal-organic framework nano-sheet dispersion on the surface of the modified substrate in a rotating drop coating manner for self-assembly, and treating the self-assembled substrate at 40-150 DEG C for 4-16 hours to obtain the metal-organic framework nano-sheet composite film. The composite film of the invention has good stability and rigidity, and has good gas separation effect.

The invention discloses a preparation method of an aptamer sensor for pesticide detection, and belongs to the technical field of safety detection of agricultural products. The preparation method provided by the invention comprises the following steps: drop-coating carbon black-chitosan compound liquid on a surface of a bare glassy carbon electrode after cleaning, activation and performance testing; then, modifying with a graphene oxide-iron oxide compound; immobilizing a pesticide aptamer on the modified electrode; and finally, closing with bovine serum albumin. The aptamer sensor prepared in the invention has characteristics of high sensitivity, low cost, high detection speed, good stability and high sample recovery rate, has a detection limit of 0.033 ng / mL, a linear range of 0.1-105 ng / mL, a recovery rate of 96.0-106.0%, and is suitable for rapid detection of pesticide residues in fruits and vegetables.

The invention discloses a method for directly synthesizing a lead sulfide cube nano particle film. The method comprises the following specific steps of: 1, mixing deionized water transparent solution of sodium or potassium ethylxanthate with deionized water solution of lead nitrate or lead acetate, wherein the mol ratio of the sodium or potassium ethylxanthate to lead is 0.5-2, fully stirring uniformly to form a sediment, filtering, washing and drying to obtain lead ethylxanthate powder; 2, dissolving and dispersing the lead ethylxanthate powder in pyridine to form a uniform solution with a concentration of 10-500mg / ml; and 3, coating a lead ethylxanthate precursor solution on a substrate by adopting a rotary coating, drop-coating or dip-coating process, and annealing at a temperature of 120-300 DEG C for 10-100min. The method is simple in process, the preparation parameter is easily controlled, the repeatability is good, and the large-scale synthesis can be carried out, a large-area uniform lead sulfide cube nano particle film can be directly assembled on the substrate, and thus a multi-step complex process in a conventional synthesizing and assembling process is avoided.

The invention provides preparation of BiVO4 composite materials NiS / BiVO4 and CoS / BiVO4 loaded with magnetic nanoparticles NiS and CoS. The preparation comprises the steps: with BiVO4 as a material, firstly, depositing on FTO conductive glass by an electrochemical deposition method to prepare a precursor thin film; then calcining to synthesize a BiVO4 thin film; and next, through combination of chemical deposition, heating treatment and electrophoretic deposition techniques, successfully loading a structure of the BiVO4 thin film with magnetic NiS and CoS nanoparticles, and constructing n-n heterojunction by a dropping coating method, to form NiS / BiVO4 and CoS / BiVO4 composite materials having a baseball structure. The structure effectively inhibits the recombination of photogenerated carriers and accelerates the separation of electrons and holes. Therefore, the composite materials have excellent PEC activity; as a photoanode for hydrogen evolution reaction, the composite materials exhibit excellent performance of electrolysis of water to produce hydrogen.

The invention discloses a preparation method for co-modified copper bismuthate nanorod photocathodes. The preparation method includes the following steps: (1) performing hydro-thermal synthesis of a CuBi2O4 nanorod under an alkaline condition by utilizing abundant and cheap bismuth sources and copper sources; (2) loading silver ions on the CuBi2O4 nanorod by adopting an ion alternating physical adsorption method; (3) taking FTO conductive glass as a substrate, forming a CuBi2O4 / Ag film by adopting a drop-coating method, and performing annealing processing through a CVD method; and (4) peelinga material by adopting a particle transfer technology to transfer to second FTO glass, performing ultrasonic processing, and preparing a nitrogen doped carbon quantum dot and sliver co-modified CuBi2O4 nanorod photocathode through the physical adsorption of nitrogen-doped carbon quantum dots. The photocathode prepared through the method can show good photo-electrocatalytic activity and visible light response characteristics under visible light, and stability can be improved, so that the preparation method can be effectively applied to the field of photo-electrocatalytic water decomposition forhydrogen production.

The invention provides a method for preparing a semiconductor oxide micro-nano composite structural film, which belongs to the technical field of inorganic nonmetal material technology and energy material preparation. A one-step method for preparing the semiconductor oxide micro-nano composite structural film has poor reliability and repetitiveness. The method adopts a drop coating method or a coating method to sequentially prepare a semiconductor oxide nanocrystalline film and a mircri / submicro semiconductor oxide film on conductive glass, so as to obtain the semiconductor oxide micro-nano composite structural film with a thickness of between 3 and 25 mu m, wherein the thickness ratio of the semiconductor oxide nanocrystalline film to the mircri / submicro semiconductor oxide film is 100-1:1. The method has the advantages of simple process, and strong reliability and repetitiveness, and is suitable for industrial production.

The invention discloses a novel roller brush which comprises a roller brush head (1), a connecting rod (2) and a handle (3). A receiving device (4) is arranged on the connecting rod (2) and positioned below the roller brush head (1), a plurality of evenly distributed discharge ports (5) are arranged on the outer annular wall of the roller brush head (1), a feed cap (6) is arranged on one side of the roller brush head (1), a mounting cavity (7) is arranged on the other side of the roller brush head (1), a clamping groove connector (8) is arranged in the mounting cavity (7), and the connecting rod (2) is connected with the roller brush head (1) through the clamping groove connector (8). Coating can be contained inside the roller brush head, repeated dipping is not needed, labor force is saved, leakage is avoided, waste is reduced, and the dropped coating can be received for recycle as the receiving device is arranged below the roller brush. Besides, the novel roller brush is convenient to mount and demount and simple in structure and has excellent application prospect.

The invention discloses a long-acting anti-icing coating as well as a preparation method and application thereof, and belongs to the technical field of coating preparation. The preparation method comprises the steps of firstly, carrying out hydrophobic and oleophylic modification on porous powder, then carrying out oil storage treatment to enable silicone oil to fully enter pores of the porous powder, then mixing a diluent, resin, a curing agent and the modified porous powder according to a certain proportion to obtain an anti-icing coating, and carrying out drop coating, blade coating or spincoating on the anti-icing coating, and curing the coating to obtain the long-acting anti-icing coating. The anti-icing coating prepared by the invention has anti-icing property and durable wear resistance, is strong in paint film adhesion, easy in method operation, low in cost, simple and effective, is suitable for various substrate materials, and can be applied to the surface of an aircraft, theinner wall of refrigeration equipment and outdoor facilities in cold regions.

The invention relates to an adhesive system for brazing flux, a coating composition for brazing filler metal and a flux coated brazing rod, and belongs to the field of flux coated brazing rods. The adhesive system for the brazing flux comprises a main agent and a curing agent; the main agent is composed of, by weight, 18-23 parts of epoxy resin, 15-20 parts of polysulfide rubber, 7-14 parts of dibutyl phthalate and 3-8 parts of diluent; the curing agent is composed of, by weight, 70%-80% of diethylenetriamine and 20%-30% of phthalic anhydride. The adhesive system for the brazing flux is composed of epoxy resin and polysulfide rubber and can be used on the brazing filler metal surface for preparing dampproof and anti-drop coating after adding and mixing brazing flux evenly. The coating can be adhered to the inner core of brazing filler metal well and good in dampproof and anti-drop effect; the flux coated brazing rod cured and prepared by the coating composition is low in organic content, capable of decomposing under the brazing temperature, less in residues and small in influence on brazing.

There is provided an apparatus for spin-coating a semiconductor substrate, including (a) a rotary table rotatable in opposite directions, (b) a nozzle dropping coating material onto a semiconductor substrate lying on the rotary table, (c) an electrode having a ring-shaped cross-section and disposed around the rotary table, and (d) a power source applying a voltage to the electrode, the voltage having an electric polarity opposite to an electric polarity of the coating material. Coating material dropped onto the semiconductor substrate is attracted to an electric field generated by the electrode around the semiconductor substrate. Hence, the coating material is not concentrated around a center of the semiconductor substrate, but is facilitated to uniformly spread over the semiconductor substrate, ensuring formation of a coating layer having a uniform thickness.

The invention provides a method used for identifying amino acid enantiomers through cyclodextrin nanoparticle electrochemistry. The method comprises following steps: cellulose nanometer crystal, beta-cyclodextrin, and a tetrafluoroterephthalonitrile terpolymer (NCC-CDP) nanoparticle are used for dropping coating of the surface of a glassy carbon electrode so as to obtain a modified electrode; anddifferential pulse voltammetry is adopted for selective identification of tryptophan enantiomers. It is shown that the tryptophan enantiomers can be identified easily, when Cu<2+> is added into tryptophan, identification rate is increased further, and at the same time, the modified electrode possesses identification effect on tyrosine and phenylalanine enantiomers.

The invention discloses an electrochemical in-situ graphene synthesis-based modification method for a carbon-based electrode. According to the method, a three-electrode or two-electrode system is adopted to complete an electrochemical treatment process, wherein the electrochemical treatment can be (1) cyclic voltammetry or a (2) direct-voltage method. According to the cyclic voltammetry, a three-electrode working surface is arranged in a supported electrolyte solution; positive voltage scanning is applied to the carbon-based electrode, so that graphene oxide can be obtained in situ; and negative voltage scanning is applied to the carbon-based electrode, so that reduced graphene oxide can be obtained in situ. According to the direct-voltage voltage method, a three-electrode working surfaceor two-electrode working surface is arranged in a supported electrolyte solution, and a constant positive direct-current voltage is applied to the carbon-based electrode so as to treat the carbon-based electrode, so that graphene oxide can be obtained in situ; and a constant negative direct-current voltage is applied to the carbon-based electrode so as to treat the carbon-based electrode, so thateduced graphene oxide can be obtained in situ. Compared with conventional modification methods such as (oxidized) graphene drop-coating and in-situ vapor deposition, the method has the advantages of high speed, simplicity, low cost, green synthesis, high controllability, high reproducibility and high stability.

The invention discloses a self-healing sensing high molecular composite material based on an ordered conductive network structure, and a preparation method thereof. According to the preparation method, interface self assembling is adopted for ordered arrangement of silver nano wires and construction of ordered silver nano wire conductive film; self-healing polycaprolactone and shape memory polyurethane are uniformly blended so as to obtain a high molecular solution, layered mixing is adopted for drop coating or spin coating of the high molecular solution onto the surface of the ordered silvernano wire conductive film; heating treatment is carried out so as to remove an organic solvent, and peeling is carried out so as to obtain the self-healing sensing high molecular composite material based on an ordered conductive network structure. The preparation method is simple; the obtained self-healing sensing high molecular composite material is excellent in conductivity; compared with disordered silver nano wire composite materials, the self-healing sensing high molecular composite material possesses following advantages: the resistance change response time is short, resistance change rate is larger, and conductivity and self-healing effect are achieved at the same time.

The invention discloses a method for improving cycle stability of a polymer electrochromic film. The method comprises the following steps: dissolving poly(3,4-ethylenedioxythiophene)-polystyrene sulfonate (PEDOT:PSS) in deionized water to obtain a PEDOT:PSS aqueous solution, uniformly coating a transparent conductive electrode with the mixed solution in a rotary drop coating mode, and then carrying out drying to obtain a conductive electrode covered with a PEDOT:PSS film; and in a three-electrode electrolytic cell system, preparing an electrolyte by a monomer, a supporting electrolyte and a mixed solvent, taking the obtained conductive electrode covered with the PEDOT:PSS film as a working electrode, taking a platinum electrode as an auxiliary electrode and taking a silver / silver chlorideelectrode as a reference electrode to carry out an electrochemical polymerization reaction at room temperature by adopting a potentiostatic method, carrying out dedoping for 50-70s under a negative potential from -0.4 to -0.8 after the polymerization is finished to obtain a polymer deposited on the working electrode, and carrying out leaching and drying to obtain the polymer film. The method has the advantages of low cost, simple operation and no pollution in the preparation process.

The invention provides a preparation method of an all-metal organic framework Van der Waals heterojunction layer film, the prepared film and application thereof. A MOFs Van der Waals heterojunction thin film which is controllable in thickness and uniform in homogeneity can be effectively prepared by adopting a liquid phase epitaxy / interface method and a seal / spin coating / drop coating method, and the method can be used for efficiently preparing high-quality double / multilayer MOFs Van der Waals heterojunction thin films with different functions, components and structures without the problem of lattice mismatch. The film provides a brand-new research platform for the development of thin-film electrical devices, and is expected to realize the preparation of high-performance electrical devicesthrough the functions of cascaded gas adsorption / separation, gas sensing and the like.

The invention provides a preparation method of needle-shaped two-dimensional organic-inorganic perovskite (C4H9NH3)2PbI4 micro-nano crystals. The method comprises the following steps: weighing PbI2 powder, dissolving the weighed powder into a mixed solvent of DMF and toluene to obtain a Pb precursor solution, performing drop coating or spin coating on a substrate by using the Pb precursor solution, and performing drying to obtain a PbI2 pre-deposited film; weighing C4H9NH3I powder, dissolving the weighed powder into isopropyl alcohol to obtain an organic amine precursor solution; and immersingthe PbI2 pre-deposited film into the organic amine precursor solution for 10 h or more, and taking out the product to obtain the needle-shaped two-dimensional organic-inorganic perovskite (C4H9NH3) 2PbI4 micro-nano crystals. The preparation method provided by the invention can be carried out in the air or at a room temperature, and has the characteristics of a simple device and preparation process and low costs.

The invention relates to a method for determining the LUMO value and the HOMO value of semiconductor nano-crystals through utilizing cyclic voltammetry. The semiconductor nano-crystals are dispersed in a solvent to form a semiconductor nano-crystal solution, the surface of a work electrode (6) is coated with the semiconductor nano-crystal solution in a drop manner to form a film, the electrochemical performances of the semiconductor nano-crystals are tested under the protection of an inert gas by means of the three-electrode system of an electrochemical work station, and the potential in the initial position of an oxidation reduction reaction of the nano-crystals is extracted, so the LUMO value, the HOMO value and the forbidden bandwidth value of the semiconductor nano-crystals are obtained through calculating in order to realize the accurate determination of the energy band structure of the semiconductor nano-crystals, and the test result obtained in the invention is smaller than the result obtained through using absorption spectrometry. The drop coating manner in the method provided by the invention makes the semiconductor nano-crystals to form the film on the surface of the work electrode, so the experimental material adoption amount is reduced; and the protection of the inert gas avoids the instability of the semiconductor nano-crystals, so the determination of the energy band structures of various semiconductor nano-crystals can be realized.

The present invention provides research of a graphene-based electrode material in capacitive deionization. According to the present invention, a porous graphene-based electrode material with mutually communicated pore channels is prepared by using a hard template method, and has a significant pore channel structure and hydrophilicity, an electrode required by capacitive deionization is coated with the material by using a self-created drop coating method, and then capacitive deionization characteristic characterization is performed; and the electrode material of the present invention has characteristics of rich pore channels, mutual pore channel communication and hydrophilicity, and provides excellent performances in the capacitive deionization characteristic characterization.

The invention belongs to the fields of high-polymer materials and conductive nano materials, and discloses a steam reduced graphene oxide conductive high-polymer composite film, and a preparation method and application thereof. The preparation method comprises the following steps: coating a high-polymer matrix with a graphene oxide solution through drop coating or spin coating, and performing heating and drying to obtain a conductive layer; coating the conductive layer with an elastic high-polymer solution through drop coating, and performing high-temperature vacuum solidification to form a flexible graphene oxide high-polymer film; and stripping the graphene oxide high-polymer film from the matrix, putting the graphene oxide high-polymer film in a closed container, adding a hydrazine hydrate solution or a hydrazine hydrate-ammonia water mixed solution around the graphene oxide high-polymer film, and performing steam reduction through heating to obtain the reduced graphene oxide high-polymer composite film. The steam reduced graphene oxide conductive high-polymer composite film is favorable in electric conductivity; the preparation method is simple; on the basis of high polymers, the obtained composite material is also conductive and has a special sensing function; and the strain resistance curve of the composite material is changed obviously. The electric conductivity and the sensing property greatly improve the application of the composite film in the aspect of intelligent materials.

The invention belongs to a bi-directional light conversion agent GdBO3:Yb<3+> / Tb<3+>-assisted photo-anode and a preparation method and application thereof. A GdBO3:Yb<3+> / Tb<3+>@TiO2 photo-anode is prepared by adopting a sol-gel drop coating technology, and then CdSe0.4S0.6 quantum dots are deposited on the surface of the photo-anode by using a continuous ion layer adsorption and reaction technology at a room temperature. A photochemical test shows that the open-circuit voltage, the short-circuit current and the power conversion efficiency of a CdSe0.4S0.6 quantum dot-sensitized solar cell allare effectively improved after the bi-directional up-and-down light conversion agent GdBO3:Yb<3+> / Tb<3+> is added.

preparation method a semiconductor anode material for hydrogen peroxide preparation by photoelectrocatalysis and a preparation method thereof. A TiO2 nanorod is grown on FTO conductive glass, and Co3O4 nanoparticles are loaded on the basis of the TiO2 nanorod to finally obtain the Co3O4 / TiO2 composite photoelectric anode material. When the anode material is prepared, the preparation includes threesteps of preparing a TiO2 nanorod precursor solution, preparing the TiO2 nanorod grown on the FTO conductive glass by a hydrothermal method and obtaining the Co3O4 / TiO2 composite photoelectric anodematerial by a drop coating method. The invention provides the novel preparation method of the Co3O4 / TiO2 composite photoelectric anode material for hydrogen peroxide preparation by photoelectrocatalysis, and the selectivity and activity that the material is oxidized from water into hydrogen peroxide can be effectively improved through co-catalysis of the Co3O4 nanoparticles.