TITANIUM DIOXIDE-ALKALINE EARTH METAL TITANATE COMPOSITE FINE PARTICLE, METHOD FOR PRODUCING THE SAME AND HIGH-REFRACTIVE-INDEX MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a high-refractive-index material comprising inorganic fine particles having a particle diameter of≤20 nm.

SOLUTION: Titanium dioxide-alkaline earth metal titanate composite fine particles represented by formula: (1-x)TiO2xMTiO3are provided, wherein M represents an atom selected from Ca, Sr and Ba, and x is a number of 0.1-0.9. A method for producing highly crystalline titanium dioxide-alkaline earth metal titanate composite fine particles having a primary particle diameter of≤20 nm and controlled photocatalytic activity of titanium dioxide is also provided which includes bringing alkaline earth metal ions and titania sol into a hydrothermal reaction in water in a supercritical or subcritical state. By adopting the method, a high-refractive-index optical material can be produced by combination with an optical polymer without reducing the transparency of the polymer.

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