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A kind of magnetic nano metal fluid and preparation method thereof

A metal fluid, magnetic nano technology, applied in nanotechnology, nanotechnology, magnetic liquid and other directions, can solve the problems of high energy consumption, complex operation, etc., to achieve the effect of good fluidity, high conductivity, not easy to volatilize and leak

Active Publication Date: 2017-02-08
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Other methods such as vacuum evaporation-decomposition method, spark erosion method, plasma method, etc. require very complicated operations and consume a lot of energy

Method used

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  • A kind of magnetic nano metal fluid and preparation method thereof
  • A kind of magnetic nano metal fluid and preparation method thereof
  • A kind of magnetic nano metal fluid and preparation method thereof

Examples

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preparation example Construction

[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 a magnetic nano-metal fluid, which comprises: liquid metal gallium, indium, tin, zinc, bismuth, lead, chromium, mercury, sodium, potassium, cesium or their binary or multiple alloys, and magnetic Nanoparticles, the volume ratio of the magnetic nanoparticles to the liquid metal / alloy is less than or equal to 50%:1. The present invention actively introduces oxygen through a specific oxygen supply mechanism to regulate the adhesion between fluid and particles, and uses metal gallium, indium, tin, zinc, bismuth, lead, chromium, mercury, sodium, potassium, cesium or their binary or multi-element alloys as the base A magnetic nanofluid with high thermal conductivity, high electrical conductivity, good fluidity, and low volatility and leakage can be obtained very quickly 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...

Claims

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Application Information

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Patent Type & Authority Patents(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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