硅醇
沉淀法白炭黑
硅烷
动态光散射
气相二氧化硅
疏水二氧化硅
色散(光学)
表面改性
化学工程
结块
材料科学
扫描电子显微镜
降水
乙二醇
吸附
高分子化学
化学
催化作用
有机化学
复合材料
纳米颗粒
纳米技术
气象学
天然橡胶
工程类
物理
光学
作者
Teofil Jesionowski,Andrzej Krysztafkiewicz
标识
DOI:10.1016/s0169-4332(00)00828-x
摘要
Silicas of highly dispersion degree were obtained. This process includes formation of silica particles and their aggregation. The ethylene glycol solution was used in precipitation process, resulting in a partial blocking of the silica surface hydroxyl groups (silanol groups) and, thus, in a decreased hydrophilicity of silica. Studies on the surface modification of silicas using silane coupling agents are described. The best modifiers were selected, which inducted a change of the silica surface from hydrophilic to hydrophobic. Basic physicochemical analyses of the obtained silicas were performed. The methods of evaluating the degree of surface modification of the silica were presented. Near infrared spectroscopy (NIR) was used to determine the degree of condensation of the silica surface silanol groups. The degree of hydrophobization of silica surface was determined by a calorimetric method. Moreover, studies on morphology and microstructure using transmission electron microscopy (TEM) were performed. Size distribution of primary particles and aggregates and agglomerates structures were determined by ZetaPlus instrument using dynamic light scattering (DLS) method.
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