A method for increasing the specific surface area of titanium phosphate plate-shaped particles of this invention includes: obtaining a liquid in a state where a powder containing titanium phosphate plate-shaped particles is dispersed in an aqueous alkaline solution.

The present invention provides an alumina particle containing molybdenum (Mo) and an inorganic coating part provided on the surface of the alumina particle.

A process for preparing whitened fly ash includes the steps of: (a) subjecting fly ash to a size classification step to obtain size classified fly ash having a particle size such that at least 90 wt % has a particle size of from 44 μm to 250 μm; (b) optionally, contacting the size classified fly ash from step (a) with water to form a slurry, wherein the slurry has a solid content of less than 40 wt %; (c) subjecting the slurry obtained in step (b) to an exhaustive magnetic separation step to form magnetically treated fly ash, wherein the exhaustive magnetic separation step includes a first magnetic extraction step and a second magnetic extraction step, wherein the second magnetic extraction step is carried out at a higher magnetic field strength than the first magnetic extraction step; and (d) subjecting the magnetically treated fly ash obtained in step (c) to milling to form whitened fly ash.

A method for producing a paint color material developing a color by a pigmentary color and a structural color, the method including: obtaining a mixed liquid containing a color material particles by alternately adding and mixing a liquid obtained by suspending core particles each having a uniform particle diameter in a solution containing Fe and a liquid containing tannic acid into a liquid containing water as a main component, the color material particles each comprising a core portion formed by the core particle and a pigmentary layer that is formed around the core portion and contains an iron tannate, and each having a particle diameter corresponding to a wavelength of the structural color; and washing the color material particles, in which a pH of the mixed liquid is adjusted to 7.0 or more prior to the second step, and the pH is adjusted in order to obtain any color

A method of purifying a particle is disclosed and includes a plurality of following steps: preparing a purification solution; fully mixing a mixed solution to be purified with the purification solution, and letting stand until a plurality of separated layers appear, removing a layer of liquid where a second purification solution is located, and extracting a layer of liquid where a first purification solution is located; and freezing and drying the extracted layer of liquid to obtain a purified particle.

Provided are a surface-treated inorganic powder, which satisfies the following expression (1) and the following expression (2), and a method of producing the same, and a dispersion and a resin composition each containing the surface-treated inorganic powder: ?Expression (1) 3.0?D1?50.0; ?Expression (2) 1.00?D1/D2<1.10, in the expression (1) and the expression (2), D1 represents a presence amount (?mol/m.sup.2) of double bonds contained in the surface-treated inorganic powder, and D2 represents a presence amount (?mol/m.sup.2) of double bonds contained in a washed powder, wherein the washed powder is a powder obtained by subjecting the surface-treated inorganic powder to predetermined washing treatments.

An electrode including: a conductive film which contains: a layered material having one or plural layers of particles of a layer body represented by: M.sub.mX.sub.n (M is at least one metal of Group 3, 4, 5, 6, or 7, X is a carbon atom, a nitrogen atom, or a combination thereof, n is not less than 1 and not more than 4, and m is more than n but not more than 5), and a modifier or terminal T existing on a surface of the layer body, (T is at least one selected from a hydroxyl group, a fluorine atom, a chlorine atom, an oxygen atom, and a hydrogen atom); and a ?-electron conjugated compound attached to the particles and having at least one selected from the group consisting of an aromatic ring, a heteroaromatic ring, a conjugated diene unit, an allyl group, and a vinyl group.

A process for preparing whitened fly ash includes the steps of: (a) subjecting fly ash to a size classification step to obtain size classified fly ash having a particle size such that at least 90 wt % has a particle size of from 44 ?m to 250 ?m; (b) optionally, contacting the size classified fly ash from step (a) with water to form a slurry, wherein the slurry has a solid content of less than 40 wt %; (c) subjecting the slurry obtained in step (b) to an exhaustive magnetic separation step to form magnetically treated fly ash, wherein the exhaustive magnetic separation step includes a first magnetic extraction step and a second magnetic extraction step, wherein the second magnetic extraction step is carried out at a higher magnetic field strength than the first magnetic extraction step; and (d) subjecting the magnetically treated fly ash obtained in step (c) to milling to form whitened fly ash.

A method for producing a barium titanate-based powder, the method including: step a of spraying a raw material including a barium titanate-based compound into a high-temperature field heated to a temperature equal to or higher than a melting point of the compound to form barium titanate-based particles; step b of washing a powder including the barium titanate-based particles formed in step a, or calcining a powder including the barium titanate-based particles formed in step a and then washing the calcined powder; and step c of calcining the washed powder obtained through step b.

A method of recovering an inorganic pigment from a coating composition, the method comprising a step of adding polyethylene glycol to the coating composition. The invention also concerns a coating composition comprising an inorganic pigment composition recovered according to the method, and the use of polyethylene glycol in the recovery of inorganic pigment from a coating composition.