Nanometer fluid and its prepn process

Abstract

The nanometer fluid includes one kind of kind of liquid medium and carbon nanotubes with several positively charged high molecules connected to the surface dispersed in the liquid medium. The nanometer fluid with well dispersed carbon nanotubes has no need of adding surfactant and other stabilizer, and possesses excellent heat transfer performance. The present invention also provides the preparation process of the nanometer fluid.

Description

【Technical field】 [0001] The invention relates to the field of heat transfer, in particular to a nanofluid and a preparation method thereof. 【Background technique】 [0002] In recent years, with the rapid development of electronic technology, the operating frequency and speed of electronic components have been continuously improved. However, at the same time, the electronic components generate more and more heat and the temperature is getting higher and higher, which seriously threatens the performance and stability of the electronic components during operation. In order to ensure the normal operation of the electronic components, it is necessary to effectively dissipate heat from the electronic components. At present, there are mainly two heat dissipation methods: air-cooled heat dissipation and liquid-cooled heat dissipation. In the air-cooled heat dissipation system, the heat pipe plays an important role in removing heat. The heat pipe usually needs to be filled with a lo...

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Problems solved by technology

At present, the methods of synthesizing carbon nanotubes are mainly arc discharge method, laser melting method and chemical vapor deposition method. Agglomeration is easy to occur in polar solvents such as aqueous solutions, so if the solution with carbon nanotubes is directly used as the filling working fluid, it will cause carbon nanotubes to condense in the heat pipe or liquid-cooled conduit, resulting in pipeline blockage

[0006] In order to effectively disperse carbon nanotubes in fluids, common methods include adding surfactants into the solution, or using strong acid to oxidize carbon nanotubes, so that acid groups are generated on the surface of carbon nanotubes to render them hydrophilic. However, surfactants In the low-pressure and high-temperature operating environment of the heat dissipation system, it is easy to cause bubbles in the solution. These bubbles will hinder heat conduction, reduce heat conduction performance, and make the heat dissipation system unable to work. Strong acid carbon dioxide can increase the hydrophilicity of the surface of carbon nanotubes, but will Change the original properties of carbon nanotubes, but change the thermal conductivity

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