Effect Of Tourmaline On The Structure Of Silica Prepared Using Synechocystis Sp. Cell As A Template

Silica hollow microspheres was a new kind of particle materials and diameter from nanometer to micron, which had characteristics such as low density, high strength, high specific surface, etc. The preparation method of SiO₂ hollow microspheres was divided into two kinds of physical method and chemical method. Commonly used sol-gel method for chemical method The hollow structure in microspheres made it having unique property of mechanical and thermal. The silica hollow microspheres had a very good application in lightweight material, refractory material, bio-medicine and so on. Tourmaline was a cyclic structure silicate mineral containing boron. It attribute three party system. Based on the structure, tourmaline had properties of spontaneous polarization and it could emit infrared. It could produce polarized electric field, activate water, enhance the ionization and reduce the clusters of water molecules.Based on the sol-gel method, this paper described preparation of silica hollow microspheres by synechocystissp. Made the pretreatment of synechocystis sp, then silica precursor reacted condensation polymerization on the surface of synechocystis sp. template solidified into shell by catalysts, meanwhile, added heat-treated tourmaline powder during the preparation process of hollow microspheres, through this method we explored the impact of tourmaline mineral materials on the structure of silica hollow microspheres.Based the experiment, we had regular and uniform size of silica hollow microspheres and the ball rate of silica hollow microspheres was high. The average particle size of the microspheres was between 1.9-2.1μm and the shell-thickness was about 0.2μm, 1/10 of particle size. Before calcinations, the spheres had shells with mesoporous. After calcinations, the shells were compact, disordered and amorphous. Compared with the obtained silica hollow microspheres using base as catalyst, the obtained spheres using acid had a smooth surface. The sol-gel process of TEOS could be accelerated by adding tourmaline, so tourmaline could speed up the reaction rate. In addition, tourmaline could avoid the agglomeration. The reason was that spontaneous polarization and far-infrared properties of tourmaline strengthen the ionization of water molecules, accelerated the hydrolysis-condensation rate of TEOS, reduced the ion concentration in solution, reduced the compressed degree on diffused electric doublet layer. So tourmaline could reduced the agglomeration of colloid.