| 摘要 |
PROBLEM TO BE SOLVED: To provide a silica particle which is useful as e.g. a low-refractive-index material, a low-dielectric-constant material, a heat insulation material, an adsorbent, a separation material and a sustained release material and has a cavity inside a polygonal shape having a relatively large particle size and its production method.SOLUTION: A method of producing a silica particle having an internal cavity includes: a step (a) of adding an aqueous solution of a silicate and/or an acidic silicate solution and an aqueous solution of an alkali-soluble inorganic compound other than silica simultaneously to a zeolite particle fluid dispersion in such a manner as to form a complex oxide (hydrate) layer of silica and the inorganic compound on the surface of the zeolite particles having a weight ratio (W)/(W) of the amount (W), by solid contents, of zeolite particles and the amount (W), by solid contents, of the complex oxide (hydrate) layer formed on the surface of the zeolite particles in a range of 0.1 to 5.0 in order to prepare a zeolite-complex oxide particle fluid dispersion; and a step (b) of adding an acid to the zeolite-complex oxide particle fluid dispersion to remove at least a part of the elements constituting the zeolite-complex oxide particles other than silicon. |
