Abstract: A method for producing particles containing a metal oxide is provided, and the method includes: feeding a metal oxide sol having a pH of 7 or higher and containing metal oxide colloidal particles as dispersoids and water as a dispersion medium, into a liquid containing a solvent having a solubility in 20° C. water of 0.05 g/100 ml or more and having a relative permittivity of 30 or lower (protic solvent) or of 40 or lower (aprotic solvent) at 20° C., and thereby forming aggregates of the metal oxide colloidal particles in the liquid; and subjecting the aggregates to a treatment such as drying and heating, and thereby converting the aggregates into particles that are insoluble in water. By appropriately selecting the solvent, particles can be obtained in the form of flakes, fibers, spheres, and the like.

Abstract: Provided is a mesoporous particle having a flaky shape, having a single-layer structure, having a thickness of 0.1 ?m to 3 ?m, and having an average pore diameter of 10 nm or more. The mesoporous particle can be obtained by a production method including: feeding a metal oxide sol having a pH of 7 or higher and containing metal oxide colloidal particles as dispersoids and water as a dispersion medium, into a liquid containing a water-miscible solvent having a relative permittivity of 30 or lower (protic solvent) or of 40 or lower (aprotic solvent) at 20° C., and thereby forming a flaky aggregate of the metal oxide colloidal particles in the liquid; and subjecting the aggregate to treatment such as drying and heating, and thereby converting the aggregate into a flaky particle that is insoluble in water.

Abstract: A method for producing particles containing a metal oxide is provided, and the method includes: feeding a metal oxide sol having a pH of 7 or higher and containing metal oxide colloidal particles as dispersoids and water as a dispersion medium, into a liquid containing a solvent having a solubility in 20° C. water of 0.05 g/100 ml or more and having a relative permittivity of 30 or lower (protic solvent) or of 40 or lower (aprotic solvent) at 20° C., and thereby forming aggregates of the metal oxide colloidal particles in the liquid; and subjecting the aggregates to a treatment such as drying and heating, and thereby converting the aggregates into particles that are insoluble in water. By appropriately selecting the solvent, particles can be obtained in the form of flakes, fibers, spheres, and the like.

Abstract: Provided is a mesoporous particle having a flaky shape, having a single-layer structure, having a thickness of 0.1 ?m to 3 ?m, and having an average pore diameter of 10 nm or more. The mesoporous particle can be obtained by a production method including: feeding a metal oxide sol having a pH of 7 or higher and containing metal oxide colloidal particles as dispersoids and water as a dispersion medium, into a liquid containing a water-miscible solvent having a relative permittivity of 30 or lower (protic solvent) or of 40 or lower (aprotic solvent) at 20° C., and thereby forming a flaky aggregate of the metal oxide colloidal particles in the liquid; and subjecting the aggregate to treatment such as drying and heating, and thereby converting the aggregate into a flaky particle that is insoluble in water.

Abstract: The present invention provides a black brightening flake which prevents fine pigment particles from agglomerating. When incorporated into a cosmetic, a coating material, etc., the flakes enable the resultant composition not only to give a satisfactory use feeling, for example, spreadability on the skin, without giving a rough feeling or be satisfactory spread on a base plate but also to have high hiding power and take on a beautiful color tone. The black brightening flake comprises a metal oxide, as a mother material, which is derived from a colloidal metal oxide particle and 5 to 70% by mass black pigment dispersedly contained in the base material. The black brightening flake has an average particle diameter of 3 to 500 ?m, an average thickness of 0.1 to 5 ?m, and an average aspect ratio of 5 to 300.

Abstract: The present invention provides blue colored flakes which are free from agglomeration of the ultramarine particles, and when incorporated in a cosmetic, a coating material, or the like, they are free from rough feeling, and give good use feeling such as good spread on the skin as well as good spread on a base plate, and exhibit beautiful color tone. The blue colored flakes comprise, as a mother material, a transparent metal oxide such as silicon dioxide and aluminum oxide and, incorporated therein in a dispersed state, 5 to 60% by mass of ultramarine particles having a particle diameter of 30 to 3000 nm. The blue colored flakes have an average particle diameter of 5 to 500 ?m, an average thickness of 0.1 to 5 ?m, and an average aspect ratio of 5 to 300.

Abstract: The present invention provides a black brightening flake which prevents fine pigment particles from agglomerating. When incorporated into a cosmetic, a coating material, etc., the flakes enable the resultant composition not only to give a satisfactory use feeling, for example, spreadability on the skin, without giving a rough feeling or be satisfactory spread on a base plate but also to have high hiding power and take on a beautiful color tone. The black brightening flake comprises a metal oxide, as a mother material, which is derived from a colloidal metal oxide particle and 5 to 70% by mass black pigment dispersedly contained in the base material. The black brightening flake has an average particle diameter of 3 to 500 ?m, an average thickness of 0.1 to 5 ?m, and an average aspect ratio of 5 to 300.