Method for producing a stable dispersion of nanoparticles, dispersion produced, and use thereof
A technology of nanoparticles and dispersions, which is applied in the field of manufacturing stable dispersions of nanoparticles and nanoparticles of inorganic materials, and can solve problems such as inability to produce completely satisfactory results
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Embodiment 1
[0039] Titanium dioxide nanoparticles (approximately 10 nm) were refined into a 20% by weight aqueous suspension with a pH value of 1.5. 12 g of said suspension was mixed with 60 ml of a 1.5% by weight gelatin solution (pigskin gelatin type A with a gel strength of 290 g Bloom, a viscosity of 5.4 mPas, and an isoelectric point of 9) at 60°C.
[0040] A sharp rise in viscosity and solidification of the nanoparticles due to unfavorable interactions between the particle gelatins can be observed.
Embodiment 2
[0042] 12 g of the suspension of titanium dioxide nanoparticles as in Example 1 were mixed with 55 g of a 9% by weight solution of hydrolyzed gelatin type A with an isoelectric point of about 9 and an average molecular weight of about 2500 Da at 60°C. The mixture was observed to be yellow in color, but the nanoparticles were not coagulated.
[0043] Subsequently, 10 ml of a 10% by weight gelatin solution (type A pigskin gelatin with a gel strength of 290 g Bloom, a viscosity of 5.4 mPas, and an isoelectric point of 9) was also added at 60°C. The viscosity of the mixture then increased significantly (the mixture had a honey-like consistency). However, the nanoparticles did not coagulate.
[0044] The obtained nanoparticle dispersion was cooled and solidified into a colloid at 25°C. The colloid is capable of remelting at 40°C and refreezing by cooling. After tempering the colloid at 80°C for 12 hours, the dispersion solidified again at 11°C and was able to melt at 24°C.
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Embodiment 3
[0047] In the present embodiment, the used nanoparticles and hydrolyzed gelatin of the method are the same as those in Example 2, the difference is that the A-type pigskin gelatin is replaced with a glue strength of 250g Bloom, a viscosity of 3.5mPas, and an isoelectric point of 7. Type A and Type B gelatin mixture.
[0048] The obtained dispersion of nanoparticles solidifies as a colloid at 19°C when cooled. Melted again at 33°C. After tempering the colloid at 60°C for 12 hours, the dispersion solidified again at 16°C and melted at 29°C.
[0049] In this example, when the resulting thin-layer film was observed through an optical microscope, no sign of coagulated nanoparticles or phase separation was found. There was no solidification of the nanoparticles in the range of -18°C to 80°C.
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Abstract
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