Low-conductivity nanofluid and preparation method thereof

A nano-fluid, low-conductivity technology, applied in the direction of chemical instruments and methods, heat exchange materials, etc., can solve the problems of instability, inability to meet the cooling requirements of power electronic equipment, high conductivity, etc., and achieve the improvement of heat exchange capacity Effect

Inactive Publication Date: 2013-04-17
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the nanofluid prepared by wet chemical method, due to the presence of impurity ions introduced by raw materials, its conductivity is high, and it cannot be stabilized under the electric field, so it cannot meet the cooling requirements of power electronic equipment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Nano-alumina with a particle size of 50 nm was heated at 600°C and H 2 Calcination treatment under atmosphere for 3h;

[0023] After cooling to room temperature, mix 1 kg of nano-alumina with 10 kg of ultrapure water with a resistivity of 16MΩ / cm, and disperse ultrasonically for 12 hours to obtain a uniformly dispersed suspension;

[0024] Pass the obtained suspension through the mixed bed ion exchange resin composed of hydrogen type cation exchange resin and hydroxide type anion exchange resin (the mass ratio of the two is 1:2) to remove charged impurity ions and make the conductivity of the suspension The rate is less than 5μs / cm;

[0025] Add 100 grams of polyoxyethylene type non-ionic dispersant to the suspension with low conductivity, stir for 4 hours, so that the dispersant is evenly coated on the surface of the nanoparticles;

[0026] The coated nanoparticle suspension passes through the mixed-bed ion exchange resin composed of hydrogen-type cation-exchange res...

Embodiment 2

[0030] Calcining nano-silicon carbide with a particle size of 40 nanometers at 450°C in an oxygen atmosphere for 1 hour;

[0031] After cooling to room temperature, take 1 kg of nano-silicon carbide and 20 kg of ultrapure water with a resistivity of 16MΩ / cm, mix them, and disperse them ultrasonically for 6 hours to obtain a uniformly dispersed suspension;

[0032] Pass the obtained suspension through the mixed bed ion exchange resin composed of hydrogen type cation exchange resin and hydroxide type anion exchange resin (the mass ratio of the two is 1:1) to remove charged impurity ions and make the conductivity of the suspension The rate is less than 5μs / cm;

[0033] Add 300 grams of alkanolamide type non-ionic dispersant to the suspension with low conductivity, and stir for 12 hours, so that the dispersant is evenly coated on the surface of the nanoparticles;

[0034] The coated nanoparticle suspension passes through the mixed-bed ion-exchange resin composed of hydrogen-type ...

Embodiment 3

[0038] Calcining nano-titanium dioxide with a particle size of 20 nanometers at 300°C under a nitrogen atmosphere for 6 hours;

[0039]After cooling to room temperature, take 1 kg of nano-titanium dioxide and 30 kg of ultrapure water with a resistivity of 16MΩ / cm, mix them, and disperse them ultrasonically for 6 hours to obtain a uniformly dispersed suspension;

[0040] Pass the obtained suspension through the mixed bed ion exchange resin composed of hydrogen type cation exchange resin and hydroxide type anion exchange resin (the mass ratio of the two is 1:1) to remove charged impurity ions and make the conductivity of the suspension The rate is less than 5μs / cm;

[0041] Add 100 grams of polyol-type nonionic dispersant to the low-conductivity suspension, and stir for 3 hours to make the dispersant evenly coat the surface of the nanoparticles;

[0042] The coated nanoparticle suspension passes through the mixed-bed ion exchange resin composed of hydrogen-type cation-exchange ...

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Abstract

The invention relates to a low-conductivity nanofluid and a preparation method thereof, belonging to the field of electrical and electronic equipment cooling. The conductivity of the nanofluid is less than 1 microsecond / cm; and the nanofluid comprises the following components in mass percentage: 40.0-99.0% of ultrapure water, 0.0-60.0% of dihydric alcohol, 0.1-10.0% of nanopowder and 0.01-3.0% of dispersing agent. The preparation method comprises the following steps of: dispersing the calcined nanopowder into ultrapure water, removing charged foreign ions, coating the dispersing agent on the surfaces of nanoparticles, and removing foreign ions again to obtain the low-conductivity nanofluid. Compared with the conventional cooling liquid, the nanofluid is high in heat exchanging capability and significant in technical advantages.

Description

Technical field: [0001] The invention relates to a low-conductivity nanofluid and a preparation method thereof, belonging to the field of power electronic equipment cooling. Background technique: [0002] With the rapid development of power electronics technology, a large number of high-power and high-power-density devices have been developed and applied. As the power of power electronic equipment increases, its heat consumption also increases. The surface heat flux density of some power electronic devices has reached tens of watts or even hundreds of watts per square centimeter. If a large amount of heat consumption cannot be dissipated in time, it will greatly affect the reliability of electronic equipment. Therefore, how to effectively discharge the waste heat in power electronic equipment, so as to prolong its life and enhance its reliability, is of great significance. At present, the commonly used cooling methods for power electronic equipment mainly include natural a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/20
Inventor 朱海涛雷清泉吴大雄苏静文王连刚张灿英
Owner QINGDAO UNIV OF SCI & TECH
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