It is mainly because the polar force in surface tension decreases which results from the increase of CH3 nonpolar group on the surface of silica particles shown from FTIR analysis.

• 表面润湿性降低, 主要是表面张力中极性力的贡献, FTIR分析表明, 这是由于二氧化硅颗粒表面-CH3非极性基团增加所致;