INORGANIC POROUS FINE PARTICLES

摘要

A sol of a porous material which has a small particle diameter, is inorganic, and has an even pore diameter; a method of synthesizing the sol; a use of the sol, especially an ink-jet recording medium excellent in ink absorption, transparency, water resistance, and light resistance; and a coating fluid for ink-jet recording media. The sol contains an inorganic porous material which has an average particle diameter as measured by the dynamic light scattering method of 10 to 400 nm and an average primary-particle aspect ratio of 2 or higher, has mesopores extending in the lengthwise direction, and contains substantially no secondary aggregate particles.