34results about How to "Easy to promote in industrial applications" patented technology

The invention relates to a bimetallic cobalt-based core-shell material and a preparation method and application thereof. A core of the bimetallic cobalt-based core-shell material is a magnetic metal Co, and a shell of the bimetallic cobalt-based core-shell material is a non-magnetic metal Ag or Cu; a shape of the bimetallic cobalt-based core-shell material is fibrous or spherical, a fiber diameteris 1.3 to 36 micrometer, and a spherical diameter is 1 to 7.3 micrometer; an atomic ratio of Co to Cu is 0.25 to 21.6, and the atomic ratio of Co to Ag is 59.8 to 74.8; a saturation magnetization strength ranges from 62.2 to 159.9 emu/g<-1>. The bimetallic cobalt-based core-shell material adopts an in-situ metal replacement method and has a microwave absorption characteristic of broadband and high absorption, wherein an effective frequency band width of which the reflectivity is less than or equal to -10dB is 5.1-7.76GHz; a bandwidth less than or equal to -20dB is 2.32-16.0GHz; a maximum reflection loss ranges from -52.5 dB to -19.7 dB. The bimetallic cobalt-based core-shell material has the advantages of simple process, easy industrial popularization, excellent material performance and good application prospect in the fields of catalysis, electrode materials, microwave absorption, high-density magnetic recording materials, sensors and the like.

The invention provides a magnetic alloy hollow microsphere and a preparation method thereof. The components of the microsphere comprise cobalt and nickel. The structural formula of the microsphere isshown as Capable of<x>Ni<1-x>, wherein x is greater than or equal to 0.14 and less than or equal to 1. The microsphere is of a hollow structure and has the diameter being 0.32-3.35 microns, the wall thickness being 4-370 nm and the saturation magnetization intensity being 80.4-152.89 emu.g<-1>. The microsphere is prepared through a mixed solvent high-temperature liquid phase reduction method. Thepreparation method comprises the steps of adding an organic solvent, water and a surface active agent into three flasks in proportion to be stirred for 10 min; adding metal salt to be subjected to electric stirring for 2 h, and dropwise adding a reducing agent to be subjected to electric stirring for 1 h; conducting reflux condensation at 170-197 DEG C for 3-4 h, and conducting repeated magnetic separating and washing through ethanol after cooling; and finally, conducting drying to obtain the required magnetic alloy hollow microsphere. The magnetic alloy hollow microsphere is made of a raw material which is low in price and easy to get. The magnetic alloy hollow microsphere is low in cost, simple in process, high in efficiency and easy to popularize. A magnetic ball chain has the properties of size and composition adjustability and can be applied to magneto-rheological, magnetic separation, catalytic and electrode materials and microwave absorption or high-density magnetic recording materials.

The invention discloses a magnetic heterostructure fiber, and a preparation method and application thereof. The fiber has a porous heterostructure, and the core of the fiber is ferroferric oxide assembled by nanocrystals and the surface of the fiber is coated by nickel nanocrystal; and the fiber length is 0.57-2.18 [mu]m, the diameter is 0.07-0.73 [mu]m, the nickel/iron atom ratio is 0:100-28.88:71.12, and the saturation magnetization is high (75.243-86.442emu/g). The fiber is prepared by using precipitation-precipitation transfer method-carbothermic reduction technology. The inventive method is simple in operation, good in controllability and repeatability, novel in formation mechanism, low in equipment requirements, low in cost and high in efficiency, and easy to promote industrial applications. The magnetic heterostructure fiber has the characteristics of porous structure, adjustable size and composition and strong magnetic responsiveness, and important application prospects in the fields of catalysts, electrode materials, magnetic recording materials, magnetic sensors, detection, microwave absorption, etc.

The invention discloses a preparation method of a Co3O4 nanotube array; particularly, the preparation method comprises the steps: a precursor is laid flat on a heated basal plate for thermal decomposition reaction lasing for 2 minutes to 5 minutes with the temperature of 250 DEG C to 450 DEG C; and then a black material generated by the thermal decomposition reaction is washed, filtered and dried to obtain the Co3O4 nanotube array. The preparation method has the advantages of simple operations, low requirement on equipment, novel preparation processes, unique formation mechanism, easy application and generalization in industry, no adding of die and plate surfactant or structure directing agent in the reaction course, short period, low cost, high efficiency and being capable of being further integrated. The nanotube array synthesized by the preparation method has high purity, low impurity content, large specific surface area, wide application range including the use as an excellent material for lithium electrode, meets the requirements of electron-level powder materials, is capable of significantly improving the performance of cells and has obvious economic and social benefits.

The invention relates to a monodisperse ferrite micro-nano sheet and a preparation method thereof. The transition metal element doped ferrite or ferric oxide is used as the component of the micro-nano sheet; a bismuth doped ferrite micro-nano sheet is of normal square shape, the side length thereof is 0.26-1.85mu m, the thickness is 20-240nm and the percent of the bismuth doped atoms is 0-14.2%; and a barium or strontium doped ferric oxide micro-nano sheet is of circular shape, the diameter is 1.48mu m-18.32mu m, the thickness is 0.16-3.54mu m and the percent of barium or strontium doped atoms is 0.3.3%. A coprecipitation-hydrothermal method is adopted for preparing the micro-nano sheet; the composition, shape and size of the particles can be regulated and controlled in the manner of adjusting the proportion of the transition metal salt; the method has the characteristics of low-cost easily acquired raw materials, low cost, simple process, low requirement for equipment, high efficiency and easiness in popularization; and the magnetic microchip has the characteristics of high monodispersity and uniformity, adjustable morphology and composition, and the like, and has wide application prospect in catalyst, electrode materials, pigments, microwave absorption or high-density magnetic recording materials.