CaCO3/SiO2 nH2O NANOCOMPOSITE PARTICLES AND SiO2 nH2O HOLLOW-STRUCTURES NANOMATERIALS AND SYNTHESIZING METHOD

Abstract

The invention provides CaCO 3 /SiO 2 ·nH 2 O nanocomposite particles and method of producing the same. A template nucleus is used calcium carbonate and the surface of nucleus is encapsulated by a SiO 2 ·nH 2 O nanolayer. The invention also provides a CaCO 3 /SiO 2 ·nH 2 O nanocomposite particles having hollow structure, in which n=0-2. The nanocomposite particles according to the invention have a number of uses.

1 .- 28 . (canceled) 
     
     
         29 . SiO 2 ·nH 2 O nanomaterials with hollow structures, where n=0-2. 
     
     
         30 . The nanomaterials according to  claim 29 , wherein the nanomaterials are mesoporous materials, and the shape is selected from the group consisting of needle-like, spherical, cubic, spindle, petal-like, chaining, laminar and fiber. 
     
     
         31 . The nanomaterials according to  claim 29 , wherein the BET surface area is 50-2000 m 2 /g and the pore volume is 0.01-10 ml/g. 
     
     
         32 . The nanomaterials according to  claim 29 , wherein the BET surface area is 70-1500 m 2 /g and the pore volume is 1-7 ml/g. 
     
     
         33 . The nanomaterials according to  claim 29 , wherein the nanomaterials are composed of noncrystalline or crystalline materials. 
     
     
         34 . A method of preparing mesoporous SiO 2 ·nH 2 O nanomaterials having hollow structures where n=0-2, the method comprising the steps of:
 calcinating mesoporous CaCO 3 /SiO 2 ·nH 2 O nanocomposite particles at a calcination temperature for a calcination time, each nanocomposite particle comprising a template core and a mesoporous coating layer, wherein the template core comprises CaCO 3 , and the coating layer comprises SiO 2 ·nH 2 O where n=0-2;   dissolving the nanocomposite particles in an acid or alkali solution; and   filtering, washing, and drying the solution to obtain the SiO 2 ·nH 2 O nanomaterials.   
     
     
         35 . (canceled) 
     
     
         36 . The method according to  claim 34 , wherein the calcination temperature is 200-1200° C., the calcination time is 0.5-100 h, and the solution is acidic and selected from the group consisting of sulfuric acid, hydrochloric acid, nitric acid, acetic acid and mixtures thereof. 
     
     
         37 . (canceled) 
     
     
         38 . (canceled)