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US 2006/0222586 A1Published application
Preparation method for nanometer grade zinc oxide crystalline (zincite) sol
AssigneeHeadway Advanced Materials Co., Ltd
InventorsAnthony Chiang, Chih-Tsung Hsu, Ching-Ping Yang
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Abstract
An environmentally friendly method for preparing zinc oxide (zincite) nanoparticle sol having more than 90% visible light transmission at 20 wt % solid; comprises of the neutralizing, under specific pH, an inorganic zinc salt with an inorganic alkali, both dissolved in ethylene glycol, and thermally aging the precipitates afterward.
Claims5
A preparing method for nanometer grade zinc oxide crystalline (zincite) sol, having more than 90% visible light transmission at 20 wt % and ≦15 nm average particle size, comprises of:
- a.) Neutralizing under pH 8˜11 an ethylene glycol solution of inorganic zinc salt with an ethylene glycol solution of inorganic alkali;
- b.) Optionally thicken the precipitate by settling or filtering and removing of excess supernatant until reaching a zinc concentration to 0.3˜3 mole/liter;
- c.) Ageing the thickened precipitate at 40˜100 deg C. for 1˜6 hours until turns into transparent sol.
Dependencies are inferred from the claim text.