固体核磁共振研究改性纳米 SiO2的表面结构

摘要

A series of KH550 modified nano-SiO2 with different compositions were prepared and studied by solid-state NMR.29 Si MAS NMR spectroscopy was applied to characterize surface structure and hydroxyl content .Hydrophilicity was measured via 1 H MAS NMR.1 H-29 Si CP/MAS NMR spectroscopy characterized the interaction at the organic-inorganic interface .The above studies show that with the increase of the degree of modification ,the surface hydroxyl content and hydrophilicity of samples were decreased . And the activity of surface proton was reduced with the increase of the degree of modification .%　　以纳米 SiO2和 KH550改性纳米 SiO2为研究对象，分别利用29 Si 魔角旋转核磁共振谱（29 Si MAS NMR）、1H魔角旋转核磁共振谱（1H MAS NMR）和1H-29Si 交叉极化/魔角旋转核磁共振谱（1H-29Si CP/MAS NMR）对纳米SiO2和KH550改性纳米SiO2的表面结构、表面羟基含量、亲水性和界面相互作用等进行了研究。实验结果表明，纳米SiO2经过KH550的改性，随着改性程度的增加，样品表面的羟基含量降低、亲水性降低、亲油性增加、表面质子运动活性随改性程度增加而减弱。