44results about How to "Overcome the problem of easy reunion" patented technology

The invention discloses transparent nanometer zirconium dioxide liquid phase dispersoid, and a preparation method and application thereof. The dispersoid comprises liquid phase media and nanometer zirconium dioxide particles, wherein the nanometer zirconium dioxide particles are uniformly dispersed into liquid phase media; the solid content of the dispersoid is 1 weight percent to 50 weight percent; the one-dimensional dimension of the nanometer zirconium dioxide particles is 1 to 12nm; the liquid phase media are water, organic solvents, a mixture of water-soluble organic solvents and water, or a mixture of different organic solvents. The nanometer zirconium dioxide in the product has high crystallinity degree; the particle diameter is small; the distribution is uniform; any surfactant is not contained; the purity is high; the dispersion effect is good; no sedimentation occurs after the still standing for 6 months or longer. The product prepared by the method does not need any treatment, and is directly the transparent nanometer zirconium dioxide liquid phase dispersoid; any substance does not need to be added for dispersion assistance; the problems of easy agglomeration, poor dispersibility and poor optical performance of the composite material are solved; higher application performance and wider application ranges are given to the product.

The invention discloses a graphene-polypyrrole-gold nanoparticle composite material which is characterized in that a method combining in-situ chemical polymerization with electrostatic adsorption is adopted to load gold nanoparticles onto a graphene-polypyrrole composite material. The preparation method comprises the following steps: 1) configuration of a solution; 2) preparation of a polypyrrole-graphene nano-composite material by a mixed reaction of the solution; 3) preparation of a gold nanoparticle solution; 4) adsorption of the gold nanoparticles. The invention further discloses the application of the graphene-polypyrrole-gold nanoparticle composite material, and the composite material is applied to the modification of electrodes of an impedance type escherichia coli biosensor, wherea linear range of detection of the escherichia coli is 1*102-1*107 CFU / mL, and the minimum detection limit is 100 CFU / mL. The impedance type escherichia coli biosensor prepared by the invention has the advantages of simple operation, low cost, convenient use, high selectivity and the like, and thus has great potential application values in the fields of food safety, clinical analysis and the like.

The invention relates to a preparation method of a graphene oxide composite material modified with lactobionic acid, comprising: producing chemical bonds between graphene oxide and PEI through the action of an activator EDC in dimethyl sulfoxide, dialysis and freeze-drying, and synthesizing GO ‑PEI; Dissolve LA in phosphate buffer, add EDC, activate with NHS, add NH 2 ‑mPEG‑COOH, at room temperature, react for 12‑24 hours, dialyze, freeze-dry to obtain PEG‑LA; dissolve the above GO‑PEI in water, add FITC solution; add the above PEG‑LA to EDC and NHS for activation, add GO‑LA PEI solution, react to get GO‑PEI‑FI‑PEG‑LA, add triethylamine to mix, add acetic anhydride, react at room temperature, dialyze, freeze-dry to obtain. The preparation process of the invention is simple, the experimental conditions are normal temperature and pressure, and the operation is easy.

The invention relates to magnetic elastomer composite materials, in particular to a Fe3O4@GO / NR magnetic elastomer composite material and a preparation method, and solves the problem that magnetic particles in existing materials are nonuniform in dispersion, prone to gathering, unstable in structural performance and low in mechanical performance. The preparation method includes: 1), adopting a chemical co-precipitation method to prepare Fe3O4 water-base magnetic liquid; 2), adopting an improved Hummers method to prepare graphite oxide, and preparing GO suspension liquid; 3), preparing stabilizer, vulcanizer and promoter dispersoid; 4), adopting an emulsion blending method to prepare the Fe3O4@GO / NR magnetic elastomer composite material. The Fe3O4@GO / NR magnetic elastomer composite material and the preparation method have the advantages that a, vulcanizing temperature is low, preparation process is simple, dispersity of the magnetic particles and GO is improved, the problem of proneness to gathering is solved, and the composite material is stable in structure; b, graphene oxide serves as reactive enhanceosome, so that mechanical performance is improved, the magnetic particles are stabilized, sedimentation and aggregation are prevented, and mechanical performance and magnetic performance are improved; c, the composite material can display excellent elastic mechanical performance, magnetic performance, heat resistance and solvent resistance under low concentration.

The invention discloses an iron phthalocyanine / activated carbon Li / SOCl 2 The preparation method of the positive electrode catalyst material of the battery comprises: taking phthalic anhydride and activated carbon and mixing them to obtain a mixture; taking urea, ammonium molybdate and ferrous ammonium sulfate hexahydrate and mixing them with the mixture, grinding them, then putting them into a ceramic crucible and Put it in a muffle furnace for sintering to obtain a sintered product; cool to room temperature, soak the sintered product, wash and filter, and dry to obtain iron phthalocyanine / activated carbon Li / SOCl 2 Catalyst material for battery positive electrode. The method has the advantages of good product dispersion, high purity, short synthesis cycle and low cost.

The invention relates to a wire saw for cutting hard and fragile materials and a manufacturing method thereof. The wire saw is fixed with an grinding material on a core wire through a bonding agent and is characterized in that the bonding agent consists of an inner layer UV resin bonding agent and an outer layer heat reactive resin bonding agent; and the grinding material is evenly and continuously distributed in a monolayer mode around the core wire, partial grinding material is embedded in the UV resin bonding agent, other partial grinding material is exposed outside the heat reactive resinbonding agent to form an exit lip, and the rest part is enwrapped by the outer layer heat reactive resin. The grinding material adopts a diamond or CBN adopting surface metal plating; and the core wire adopts a copperized music wire. The manufacturing method is performed continuously and quickly according to the following steps: under the traction of a driving device, setting out the core wire continuously through a wire plate, surface preparation, cleaning, drying, coating with the inner layer UV resin bonding agent, grinding material cementation, UV curing, coating with the outer layer heatreactive resin bonding agent, thermocuring and drawing in a cable to form a plate. The wire saw and the method solve the problem of driving aspects before cured resin is completely cured, and can effectively solve the problem that the grinding material in the prior art is easy to agglomerate.

The invention discloses a macroscopic preparation method of a cellulose nanocrystal (CNC), which is green and environment-friendly. Firstly, cellulose is crushed and then is pretreated; afterwards, an oxometallate solution and an organic acid are added, the oxydrolysis is carried out, and the CNC with a carboxyl group on a surface is obtained after centrifugal dialysis treatment. The yield of the preparation method can exceed 70 percent; the length of the made CNC can be adjusted in the range of 195nm to 260nm; the content of the carboxyl group on the surface can reach 50mmol / g; compared with a CNC made by a sulfuric-acid acid hydrolysis method, the CNC made by the macroscopic preparation method provided by the invention is increased by 50 to 100 DEG C in heat resistance; used oxometallate and organic acid are both green reagents and are further a few in use levels; problems that the preparation cost of the CNC is high and further the environmental pollution is easily caused, and the like, at present are solved.

The invention specifically relates to a preparation method of a NiO electrode material derived from MOFs, which solves the problems of less sample volume and easy agglomeration in the preparation method of the existing NiO electrode material. A preparation method of MOFs-derived NiO electrode material, the method is realized by the following steps: S1: dissolving nickel nitrate hexahydrate in deionized water; S2: adding sodium citrate dihydrate to the solution to obtain solution A; S3 : dissolve potassium cobalt cyanide in deionized water to obtain solution B; S4: pour solution B into solution A, stir and let stand to obtain precipitate C; S5: wash the precipitate with deionized water and absolute ethanol to obtain Washed precipitate C; S6: drying to obtain powder C; S7: heat treatment of powder C to prepare NiO supercapacitor electrode material. In the present invention, NiCo-PBA is used as a precursor, and NiO supercapacitor electrode material with good performance is obtained by direct calcination. The present invention has simple operation process, low production cost, and can realize mass preparation.

The invention relates to a preparation method of a carboxymethyl chitosan modified graphene oxide composite material; the preparation method includes the steps: (1) under the action of activating agents EDC and NHS, allowing graphene oxide dispersed in water to generate chemical bond connection with CMC, carrying out a reaction for 24 h at room temperature, to obtain a suspension with relatively good micro-particle dispersity, dialyzing, freeze-drying, and thus synthesizing GO-CMC; and (2) dissolving the obtained product in distilled water, adding an appropriate amount of fluorescein FITC; and acetylating the product, carrying out a stirring reaction for 24 h at room temperature, dialyzing, freeze-drying, and thus synthesizing the graphene oxide GO-CMC-FI-Ac composite material. The preparation method is simple to operate, and the product is easy to handle; and the composite material can be applicable to drug sustained release and cell imaging, and the cost is low.