A method of producing ceria nanocrystals is provided. The method includes providing a gas that includes ozone to a solution that includes a cerium salt, and obtaining ceria nanocrystals from the solution after the gas is provided to the first solution. A method of producing nanoparticles is provided. The method includes providing a gas that includes ozone to a solution that includes a metal salt that includes at least one of a transition metal or a lanthanide, and producing at least one of metal oxide nanoparticles, metal oxynitrate nanoparticles, or metal oxyhydroxide nanoparticles from the solution after the gas is provided to the solution.

An object of the present invention is to provide a method for producing oxide particles with controlled color characteristics and to provide oxide particles with controlled color characteristics. The present invention provides a method for producing oxide particles, comprising controlling color characteristics of the oxide particles by controlling the ratio of M-OH bonds, the binding of one or more different elements (M) other than oxygen or hydrogen with hydroxyl group (OH), in oxide particles selected from metal oxide particles and metalloid oxide particles. According to the present invention, oxide particles having controlled color characteristics of any one of reflectance, transmittance, molar absorption coefficient, hue, or color saturation can be provided by controlling the percentage of the M-OH bonds contained in metal oxide particles or metalloid oxide particles.

An object of the present invention is to provide a method for producing oxide particles with controlled color characteristics and to provide oxide particles with controlled color characteristics. The present invention provides a method for producing oxide particles, comprising controlling color characteristics of the oxide particles by controlling the ratio of M-OH bonds, the binding of one or more different elements (M) other than oxygen or hydrogen with hydroxyl group (OH), in oxide particles selected from metal oxide particles and metalloid oxide particles. According to the present invention, oxide particles having controlled color characteristics of any one of reflectance, transmittance, molar absorption coefficient, hue, or color saturation can be provided by controlling the percentage of the M-OH bonds contained in metal oxide particles or metalloid oxide particles.

A composition including cerium and zirconium oxides, including at least 30 wt.-% cerium oxide is desired. Following calcination at a temperature of 900 DEG C. for 4 hours, the composition has two populations of pores, the diameters of the first population being centered around a value of between 5 nm and 15 nm for a composition including 30% to 65% cerium oxide or between 10 nm and 20 nm for more than 65% cerium oxide and the diameter of the second population being centered around a value of between 45 nm and 65 nm for 30% to 65% cerium oxide or between 60 nm and 100 nm for more than 65% cerium oxide.

The object of the present invention is to provide a composition for a laminated coating film having designability to a coated body and weather resistance. The present invention provides a composition for a laminated coating film, comprising silicon oxide-coated iron oxide particles, wherein at least a part of the surface of said iron oxide particles is coated with silicon oxide, wherein the diameter of said iron oxide particles is 1 to 50 nm, and wherein the average reflectivity of said silicon oxide-coated iron oxide particles for the light of the wavelengths of 620 to 750 nm is 25% or less. It is preferable that the transmittance of the dispersion comprising said silicon oxide-coated iron oxide particles for the light of the wavelength of 200 to 420 nm is 2.0% or less, and the transmittance of the same for the light of the wavelength of 620 to 780 nm is 80% or more.

The object of the present invention is to provide a composition for a laminated coating film having designability to a coated body and weather resistance. The present invention provides a composition for a laminated coating film, comprising silicon oxide-coated iron oxide particles, wherein at least a part of the surface of said iron oxide particles is coated with silicon oxide, wherein the diameter of said iron oxide particles is 1 to 50 nm, and wherein the average reflectivity of said silicon oxide-coated iron oxide particles for the light of the wavelengths of 620 to 750 nm is 25% or less. It is preferable that the transmittance of the dispersion comprising said silicon oxide-coated iron oxide particles for the light of the wavelength of 200 to 420 nm is 2.0% or less, and the transmittance of the same for the light of the wavelength of 620 to 780 nm is 80% or more.

Provided is a method for producing an inorganic oxide in the form of a thin film, the method including a step of bringing a first liquid and a second liquid with each other, the first liquid containing an inorganic oxide precursor and the second liquid containing a substance reacting with the inorganic oxide precursor of the first liquid to form an inorganic oxide derived from the inorganic oxide precursor. The step is performed by continuous operation. At least one of the first liquid and the second liquid includes an ionic liquid.

A silicon oxide-coated oxide composition for coating is disclosed in which color characteristics, particularly reflectivity are controlled, and a method of producing a composition for coating is disclosed which is used by blending the composition for coating to a paint constituting a coated body in which weather resistance is required. The silicon oxide-coated oxide composition for coating in which weather resistance is required includes silicon oxide-coated oxide particles wherein at least a part of the surface of the oxide particles is coated with silicon oxide, wherein the silicon oxide is amorphous for the purpose of controlling color characteristics of the silicon oxide-coated oxide composition for coating. The method of producing the composition for coating, wherein color characteristics of the oxide particles are controlled, includes producing the oxide particles by selecting presence or absence of amorphous silicon oxide covering at least a part of the surface of the oxide particles, and presence or absence of an acetyl group as a functional group contained in the silicon oxide-coated oxide particles.

Nanoplatelet forms of metal hydroxide and metal oxide are provided, as well as methods for preparing same. The nanoplatelets are suitable for use as fire retardants and as agents for chemical or biological decontamination.

Nanoplatelet forms of metal hydroxide and metal oxide are provided, as well as methods for preparing same. The nanoplatelets are suitable for use as fire retardants and as agents for chemical or biological decontamination.