A disperse system capable of regulating and controlling an icing temperature, a preparing method thereof and applications of the system
A dispersion system and system technology, applied in the direction of application, chemical instruments and methods, heat exchange materials, etc., can solve the problems of strong cytotoxicity, narrow application range, high cost, etc., and achieve good biocompatibility and low raw material consumption Less, cost-saving effect
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Embodiment 1
[0058] Choose silica sol TM40 with a particle size of 25nm and a negatively charged surface, with a mass fraction of 40% and a specific surface area of 120m 2 / g. Weigh 0.42g of TM40, add 9.58g of pure water, mix well, and prepare a dispersion liquid with a mass fraction of TM40 of 1.7%.
[0059] Select the silica sol 30R25 with a particle size of 25nm and a negatively charged surface, with a mass fraction of 30% and a specific surface area of 120m 2 / g. Weigh 0.56g of 30R25, add 9.44g of pure water, mix well and prepare a dispersion liquid with a mass fraction of 30R25 of 1.7%.
[0060] Select the silica sol 30CAC25 with a particle size of 25nm and a positively charged surface, with a mass fraction of 35% and a specific surface area of 120m 2 / g. Weigh 0.48g of 30R25, add 9.52g of pure water, mix well and prepare a dispersion liquid with a mass fraction of 30CAC25 of 1.7%.
[0061] The freezing temperatures of the three dispersions were measured respectively, and c...
Embodiment 2
[0064] Weigh 2.50 g of polyvinyl alcohol (PVA) with a number average molecular weight of 60,000, heat and swell at 85° C. and dissolve in 97.5 g of pure water to prepare an aqueous solution with a mass fraction of 2.5%. Take 1.20 g of an aqueous solution of polyvinyl alcohol with a mass fraction of 2.5%, add 8.80 g of pure water and mix uniformly to obtain an aqueous solution of polyvinyl alcohol with a mass fraction of 0.3%.
[0065] Weigh 10 g of polyethylene oxide (PEO) with a number average molecular weight of 30,000, dissolve it in 90 g of pure water after swelling, and prepare an aqueous solution with a mass fraction of 10%. Take 0.3 g of an aqueous solution of polyethylene oxide with a mass fraction of 10%, add 9.7 g of pure water and mix uniformly to obtain an aqueous solution of polyethylene oxide with a mass fraction of 0.3%.
[0066] The freezing temperatures of aqueous solutions of polyvinyl alcohol and polyethylene oxide with a mass fraction of 0.3% were measured ...
Embodiment 3
[0069] Polyethylene oxide (PEO) with a number average molecular weight of 30,000 is prepared by swelling and dissolving into a 10% PEO aqueous solution;
[0070] Prepare silica sol TM40 with a particle size of 25nm and a negatively charged surface, with a mass fraction of 40% and a specific surface area of 120m 2 / g;
[0071] Take 0.85g of the above negatively charged silica sol TM40, mix it with 0.60g of 10% PEO aqueous solution, add 18.55g of pure water at the same time, stir it evenly and place it on a rotary mixer for 24 hours When the adsorption equilibrium is reached, 20g can be prepared with an adsorption capacity of 1.50mg / m 2 The dispersion system of surface negatively charged colloidal silica nanoparticles TM40 with polyethylene oxide.
[0072] Freezing temperature is measured with embodiment 1. Figure 5 The freezing temperature of the dispersion system of polyethylene oxide and colloidal nanoparticles TM40 of this embodiment is given, and it can be found by co...
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