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
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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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