Method for preparing shape-changed nanosize colloidal silica
AssigneeChung-Shan Institute of Science and Technology
InventorsZong-Whie Shih, Kai-Yia Chang, Chun-Lan Tseng, Chun-Yuan Ro
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Abstract
A method for preparing shape-changed nanosize colloidal silica comprising the following steps: a). providing a nanosize spherical colloidal silica solution having an average diameter no more than 100 nm; b). adding a coagulant having a concentration no more than 5 wt % and an active silicic acid to the colloidal silica solution, and raising the reaction temperature; and c). keeping addition of said active silicic acid to said solution obtained from step b) continuously until the concentration of SiO2 reaches 6 to 50% by weight.
Claims14
A method for preparing shape-changed nanosize colloidal silica comprising the following steps:
- a). providing a nanosize spherical colloidal silica solution having an average diameter no more than 100 nm;
- b). adding a coagulant having a concentration no more than 5 wt % and an active silicic acid to the colloidal silica solution, and raising the reaction temperature;
- and
- c). keeping addition of said active silicic acid to said solution obtained from step b) continuously until the concentration of SiO2 reaches 6 to 50% by weight.
Dependencies are inferred from the claim text.