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103results about How to "Reduce reunion" patented technology

Method for preparing nanometer flaky yttrium oxide powder

The invention relates to a method for preparing nanometer flaky yttrium oxide powder. The method is characterized by comprising the following steps of: preparing a yttrium-containing inorganic acid salt solution, regulating the solubility of yttrium-containing inorganic acid salt to be 0.1 to 0.5 mol/L, regulating the PH value by using alkaline liquor until the solution is white colloidal suspension, transferring the suspension to a hydro-thermal reaction kettle, and performing hydro-thermal treatment at the temperature of between 80 and 200 DEG C for 24 to 48 hours; after cooling to room temperature, performing centrifugal separation to obtain a precursor; washing the precursor for 4 to 6 times by using deionized water, and washing for 3 to 5 times by using alcohol to remove residual acid radical ion impurities fully; and drying at the room temperature, and calcining at the temperature of between 600 and 800 DEG C for 3 to 6 hours to obtain the nanometer flaky yttrium oxide powder. The flaky yttrium oxide powder prepared by the method is high in dispersity, the grain diameter ranges from 100 to 300 nanometers, the flaky thickness ranges from 10 to 20 nanometers, and a ratio of the diameters of crystal grains to the flaky thickness is (10-30):1. The prepared nanometer flaky yttrium oxide powder can be used as a template material for texturing ceramics and a ceramic additive, and also can be used for preparing high-temperature resistant and corrosion resistant structural materials. The method is simple, and low in cost, and reaction temperature and reaction pressure is low; and granules are flaky, have the nanometer-scale grain diameters and a good dispersing effect and are distributed uniformly and high in purity, so the method is suitable for industrial production.
Owner:FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI

Compound grapheme absorption agent, method for preparing compound grapheme absorption agent and application of compound grapheme absorption agent

The invention discloses a compound grapheme absorption agent which comprises grapheme, nanometer zero-valent iron and cetyl trimethyl ammonium bromide. The invention further discloses a method for preparing the compound grapheme absorption agent. The method for preparing the compound grapheme absorption agent includes the following steps that firstly, oxidized grapheme is dispersed in water with ultrasonic waves and oxidized grapheme suspension liquid is obtained; secondly, the nanometer zero-valent iron and the cetyl trimethyl ammonium bromide are added into the oxidized grapheme suspension liquid obtained in the first step, fully stirred and fully reacted and a reaction solution is obtained; thirdly, the reaction solution obtained in the second step is added with reductive agents and fully reacted and black flocks are obtained; fourthly, the black flocks obtained in the third step are filtered, washed and dried to obtain the compound grapheme absorption agent. The compound grapheme absorption agent is efficient, green, economic, friendly to environment, and suitable for large-scale production. The preparing method is simple and conditions are easy to control.
Owner:SOUTH CHINA UNIV OF TECH

Preparation method and application of modified graphene oxide/chitosan composite material

The invention discloses a preparation method and application of a modified graphene oxide/chitosan composite material. The modified graphene oxide/chitosan composite material is prepared from the following components of graphene oxide, chitosan and disodium edentate. The preparation method comprises the steps of adding the water-soluble disodium edentate in graphene oxide suspension liquid which is obtained after carrying out ultrasonic treatment in a stirring way, and uniformly mixing the mixture; then adding a chitosan solution which is dissolved in glacial acetic acid in the stirring way; carrying out suction filtration, centrifugation, vacuum drying and grinding/sieving after carrying out ultrasonic stirring for a certain time, thus obtaining the modified graphene oxide/chitosan composite material. The modified graphene oxide/chitosan composite material prepared by the method can be used as an adsorbent to be used in the field of water pollution control and to be particularly used for adsorbing and removing heavy metal pollutants in wastewater, and has the advantages that the preparation method is simple, the adsorption speed is fast, the regeneration performance is good, and the like; the sources of needed raw materials are wide, the cost is low, and the actual application value is high.
Owner:SOUTH CHINA UNIV OF TECH

Preparation method of polyvinylidene fluoride composite material with high piezoelectricity

The invention provides a preparation method of a polyvinylidene fluoride composite material with high piezoelectricity, and relates to a preparation technology of piezoelectric flexible materials. Thepolyvinylidene fluoride composite material is a composite fiber membrane prepared by means of an electrospinning method using polyvinylidene fluoride as a matrix and a core-shell structure formed bynano-barium titanate and carbon nanotubes as a reinforcement. The preparation method aims at solving the problems of uneven mixing of two kinds of reinforcements doped in an existing polyvinylidene fluoride piezoelectric fiber membrane, self agglomeration of the two reinforcements or low content of the beta crystal phase in the fiber membrane, and poor piezoelectric performance. The CNT@BaTiO3 (core/shell) particles prepared by adopting a chemical method can be uniformly dispersed in a polymer, and the prepared composite fiber membrane has good flexibility and mechanical properties. The crystallinity is 55%-80%, the content of the beta crystal phase is 60%-91%, the piezoelectric constant D33 is 35-50 pC/N, and the composite fiber membrane can be applied to devices such as piezoelectric sensors, piezoelectric nanogenerators and the like.
Owner:TIANJIN UNIVERSITY OF TECHNOLOGY

Method for in-situ growth of calcium silicate hydrate on surface of mineral admixture

ActiveCN108314345AReduce reunionImprove dispersion uniformityAlkaline-earth metal silicatesMaceralAqueous solution
The invention discloses a method for the in-situ growth of calcium silicate hydrate on the surface of a mineral admixture. The method comprises the following steps: (1) performing alkali erosion: preparing an aqueous solution of a silicon source, adding the mineral admixture to the aqueous solution, and stirring the mineral admixture and the aqueous solution for a period of time to obtain a mineral admixture slurry; and (2) performing a chemical co-precipitation reaction: dropwise adding a calcium source to the mineral admixture slurry obtained in step (1), stirring the calcium source and themineral admixture slurry for a period of time, and then performing suction filtration, washing and drying on the obtained slurry to obtain calcium silicate hydrate in situ grown on the surface of themineral admixture. The method improves the dispersion uniformity of the calcium silicate hydrate, reduces the particle size of the calcium silicate hydrate and improves the early activity of the mineral admixture. The calcium silicate hydrate in situ grown on the surface of the mineral admixture, prepared by the method, can significantly improve the early strength of a cement-based material and greatly improve the later performances of the cement-based material, and also can realize the large-admixing amount application of the mineral admixture by improving the admixing amount of the mineral admixture.
Owner:SOUTHEAST UNIV +1

Polylactic acid-polyethylene glycol block copolymer-based magnetic microsphere preparation method

ActiveCN103980506AReduce reunionImproves dispersibility and stabilityFerriferrous OxideOrganosolv
The invention relates to a polylactic acid-polyethylene glycol block copolymer (PLA-PEG-PLA)-based magnetic microsphere preparation method. Magnetic microspheres are prepared by adopting ferriferrous oxide (Fe3O4) as a core material and the PLA-PEG-PLA as a wall material through an emulsion solvent evaporation process. The preparation method comprises the following steps: modifying Fe3O4; dissolving the PLA-PEG-PLA in an organic solvent, adding modified Fe3O4, carrying out ultrasonic dispersion to obtain an oil phase, dissolving polyvinyl alcohol in deionized water to obtain a water phase, mixing the water phase with the oil phase, and carrying out emulsion dispersion by using a high speed dispersion homogenizer to obtain an oil-in-water O/W emulsion; and transferring the O/W emulsion to a beaker, carrying out low speed stirring until the organic solvent completely volatilizes, centrifuging, washing, carrying out pumping filtration, and carrying out vacuum drying. The preparation process is simple; and the prepared magnetic microspheres have the particle sizes of 6-8mum, and has the advantages of structured surface morphology, high entrapment rate and good magnetic responsibility; and the prepared magnetic microspheres can be used as a target administration carrier.
Owner:磐升瑞祥(山东)生物工程股份有限公司

Method for manufacturing dry-pressing heterosexual permanent-magnetic material

ActiveCN103848621AExtend the scope of controlReduce reunionMeal powderMagnetic powder
The invention discloses a method for manufacturing a dry-pressing heterosexual permanent-magnetic material, and belongs to the technical field of a permanent-magnetic material. The method comprises the following steps: crushing a pre-sintering material into crude powder, adding a quadratic formula formed by silicon dioxide and a boric acid to the crude powder and then carrying out ball-milling; scattering the slurry obtained in a ball-milling manner after baking; adding 0.1-3.0% of calcium carbonate according to the weight percent and then agitating and vibration and milling by a blender mixer to obtain mixed powder; adding allocated quantity of camphor powder and calcium stearate to the mixed powder, and then crushing at a high speed, so as to prepare the dry-pressing magnetic powder. Even dispersion can be ensured by adding the calcium carbonate after drying of fine powder is finished, and adhesion of particles is not generated. Therefore, the pressing density of a magnetic body and the control range of the drying temperature range can be improved, and meanwhile, birdnesting is opened as much as possible by a vibration and milling process. Thus, birdnesting between particles is reduced, meanwhile, a corner angle is removed, the prepared permanent-magnetic material has good orientation degree and density, and the performance is significantly improved.
Owner:BEIKUANG MAGNETS FUYANG CO LTD

Bacterial cellulose film/nano-iron composite material and preparation method and application thereof

ActiveCN108034067AImprove removal abilityReduce reunionWater/sewage treatment by reductionIonPollutant
The invention discloses a bacterial cellulose film/nano-iron composite material and a preparation method thereof. The preparation method of the bacterial cellulose film/nano-iron composite material comprises the following steps of: (1) putting bacterial cellulose film in an alkaline solution for activation to obtain activated bacterial cellulose film; (2) performing extraction on the activated bacterial cellulose film by using a polar-alcohol aqueous solution so as to remove free water/bound water on the surface and interior of the film and therefore obtain semi-dehydrated activated bacterialcellulose film; and (3) putting the semi-dehydrated activated bacterial cellulose film in a ferrous ion solution, and performing in-situ reduction on ferrous ions under the action of sodium borohydride to obtain the bacterial cellulose film/nano-iron composite material. According to the bacterial cellulose film/nano-iron composite material and the preparation method thereof, an activation in-situchemical precipitation method is adopted to prepare the bacterial cellulose film loaded nano-iron composite material, so that nano-iron is distributed unformly in the interior and on the surface of the bacterial cellulose film, and thus the ability of removal of microorganisms/organic pollutants is improved.
Owner:RENMIN UNIVERSITY OF CHINA
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