Magnetic nanometer-sized metal fluid and preparation method thereof
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A metal fluid and magnetic nanotechnology, applied in the direction of nanotechnology, nanotechnology, magnetic liquid, etc., can solve the problems of complex operation and high energy consumption, and achieve the effects of high electrical conductivity, good fluidity, and high thermal conductivity
Active Publication Date: 2014-10-29
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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Other methods such as vacuum evaporation-decomposition method, spark erosion method, plasma method, etc. require very complicated operations and consume a lot of energy
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[0030] The present invention also provides a highly efficient and rapid preparation method of magnetic nano metal fluid, said method comprising the following steps:
[0031] Step S1, select metal gallium, indium, tin, zinc, bismuth, lead, chromium, mercury, sodium, potassium, cesium or their binary or multi-component alloys, and liquefy the metal / alloy by heating;
[0032] Step S2, adding magnetic nanoparticles to the liquid metal / alloy, pumping in air or oxygen while stirring, the stirring rate is 0-1000rpm, heating the liquid metal / alloy during the stirring process, the temperature is 25-1000°C, The volume ratio of oxygen in the pumped gas is 21% to 100%, and the stirring time is 10min to 10h to form a magnetic nano metal fluid.
[0033] Preferably, the nanoparticles in the step 2 are ferrite particles, metal particles, ferromagnetic nitride particles.
[0034] Preferably, the ferrite particles are Fe3O4, CoFe2O4, ZnFe2O4, MnZnFe2O4.
[0035] Preferably, the metal particle...
Embodiment 1
[0046] Measure 10ml of gallium metal, melt it into a liquid state through a hot water bath, continue heating in the air at a heating temperature of 50°C, and add nickel nanoparticles with a particle size of 50nm coated with silicon dioxide in a volume of 1ml to it . Start the stirring impeller at a stirring rate of 150rpm / min, while pumping air into it from the bottom. After stirring for 20 minutes, a relatively uniform magnetic nano metal fluid can be obtained.
Embodiment 2
[0048] According to the preparation method of Example 1, while stirring, oxygen with higher oxygen content, such as pure oxygen, is pumped into the bottom of the liquid metal through an oxygen generator.
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Abstract
The invention discloses magnetic nanometer-sized metal fluid. The magnetic nanometer-sized metal fluid comprises liquid gallium, liquid indium, liquid tin, liquid zinc, liquid bismuth, liquid lead, liquid chromium, liquid mercury, liquid sodium, liquid potassium, liquid cesium or a dual-component alloy or a multi-component alloy of the metal materials and magnetic nanometer-sized particles added to the metal materials. The volume ratio of the magnetic nanometer-sized particles to the liquid metal materials / the alloy is smaller than or equal to 0.5:1. Oxygen is actively introduced through a specific oxygen supply mechanism to adjust and control the adhesiveness of the fluid and the particles, and taking the liquid gallium, the liquid indium, the liquid tin, the liquid zinc, the liquid bismuth, the liquid lead, the liquid chromium, the liquid mercury, the liquid sodium, the liquid potassium, the liquid cesium or the dual-component alloy or the multi-component alloy of the metal materials as basic liquid, the magnetic nanometer-sized metal fluid which is high in heat conductivity and electric conductivity, good in fluidity and not prone to volatilization or leakage can be obtained fast and efficiently.
Description
technical field [0001] The invention belongs to the technical field of magnetic fluids, in particular to a magnetic nano metal fluid and a preparation method thereof. Background technique [0002] Since the discovery of the magnetorheological effect of ferrofluids, ferrofluids have attracted widespread attention as a new type of smart material. After adding magnetic nanoparticles into the fluid, the mixing of the magnetic particles and the base fluid makes the fluid have both the magnetism of ordinary magnetic materials and the fluidity of fluids. Under the action of an external magnetic field, the flow properties of the fluid will change greatly, and even lose its fluidity. After the magnetic field is removed, the fluidity of the fluid can quickly recover. This conversion results in significant changes in the fluid's elasticity, plasticity, viscosity, flow characteristics, magnetization, electrical conductivity, heat transfer, and other physical properties. The conversion...
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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/44B82Y30/00
Inventor 熊铭烽刘静
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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