Abstract: The invention provides CaCO3/SiO2.nH2O nanocomposite particles and method of producing the same. A template nucleus is used calcium carbonate and the surface of nucleus is encapsulated by a SiO2.nH2O nanolayer. The invention also provides a CaCO3/SiO2.nH2O nanocomposite particles having hollow structure, in which n=0-2. The nanocomposite particles according to the invention have a number of uses.

Abstract: The invention provides CaCO3/SiO2·nH2O nanocomposite particles and method of producing the same. A template nucleus is used calcium carbonate and the surface of nucleus is encapsulated by a SiO2·nH2O nanolayer. The invention also provides a CaCO3/SiO2·nH2O nanocomposite particles having hollow structure, in which n=0-2. The nanocomposite particles according to the invention have a number of uses.

Abstract: A process for preparing perovskite-type compound Ax(BO3)y powders involving reacting a solution containing A and a solution containing B, or a combined solution comprising A and B, with an alkaline solution in a high-gravity reactor at a temperature ranging from about 60° C. to about 100° C. A is one or more metal elements selected from the group consisting of Li, Na, K, Mg, Ca, Sr, Ba, Pb, Sm, La, Nd, Bi, and other rare-earth metal elements. B is one or more metal elements selected from the group consisting of Ti, Zr, Sn, Hf, Nb, Ce, Al, Zn, Mn, Co, Ni, Fe, Cr, Y, Sc, W, Ta, and the like. The resulting mixture is then filtered, rinsed and dried to obtain the desired powders.

Abstract: A hollow-structured mesoporous silica material composed of hollow silica particles that have a shell having radial-arrayed channels, and a process for its preparation. The thin-shell type of mesoporous materials with different morphologies are prepared by growing and synthesizing mesoporous silica on the surface of calcium carbonate nanoparticles with different shapes as inorganic templates, and then removing the inorganic templates. The hollow-structure mesoporous silica material can be used in many fields such as the preparation of catalyst, pesticide and optical fiber.

Abstract: The invention provides CaCO3/SiO2.nH2O nanocomposite particles and method of producing the same. A template nucleus is used calcium carbonate and the surface of nucleus is encapsulated by a SiO2.nH2O nanolayer. The invention also provides a CaCO3/SiO2.nH2O nanocomposite particles having hollow structure, in which n=0-2. The nanocomposite particles according to the invention have a number of uses.