The phase diagram of Na2MoO4-K2MoO4 system is assessed and re-determined.

The factors influencing the modifying efficiency,such as amount of modifier,modifying time,rotating speed of the mill and ratio of ball and silica,were discussed.

Core/shell composite microparticles with silica nanoparticle as core and crosslinked poly(tert-butylmethacrylate) as shell were prepared by seed-emulsion polymerization utilizing 3-(trimethoxysilyl)propyl methacrylate(MPS) modified silica particles as seeds,tert-butylmethacrylate as monomer and sodium dodecyl sulfate(SDS) as emulsifier.

By using of the alkalinity catalyst of ammonia and controlling the water content, the ethyl-orthosilicate occured hydrolytic reaction to form nano-silica dispersed in ethanol, then washed, dried and silica nanoparticles were prepared.

The effects of non-aqueous ball milling on the structure and properties of modified silicon dioxide particles were investigated using X-ray powder diffraction, particle size analysis and zeta potential analysis, etc.

The application of nano-particles,such as zinc oxide and silicon dioxide,in the ultraviolet radiation shield coatings is summarizes in this paper.

Purpose To study the expression and translocation of nuclear transcription factor Sp1 in type Ⅱ pneumocytes (A549) after stimulated by silicon dioxide in vivo and in vitro and to discuss the role which nuclear transcription factor Sp1 played in the development of silicosis.