... encapsulation, polymer of macromolecule, rubber, plastics, coating, paint, adhesive Nanometer silica powder (nm-SiO2) is a new kind of inorganic ... , because of its extra small size (1 to 100 nanometer). It has many special characteristics; such as big surface ... in 2000. Because of its especial technique and material, the nanometer silica powder has different capabilities from others. For example, ...