Physicochemical and morphological properties of hydrated silicas precipitated following alkoxysilane surface modification
Physicochemical and morphological properties of hydrated silicas precipitated following alkoxysilane surface modification
复制标题
DOI：
10.1016/s0169-4332(02)01090-5
复制
发表时间：
2003-01
影响因子：
6.7
通讯作者：
T. Jesionowski;J. Żurawska;A. Krysztafkiewicz;Monika Pokora;D. Waszak;W. Tylus
中科院分区：
文献类型：
--
作者：
T. Jesionowski;J. Żurawska;A. Krysztafkiewicz;Monika Pokora;D. Waszak;W. Tylus
从偏硅酸钠和硫酸的水溶液中沉淀得到改性二氧化硅。采用氨基硅烷(AEAPTS)、缩水甘油氧基硅烷(GPTS)、硫代硅烷(McPTS)和乙烯基硅烷(VTMES)等不同官能团的硅烷偶联剂进行改性。利用FTIR、29Si CP MAS核磁共振和XPS等技术对所得改性二氧化硅进行了广泛的物理化学评价。二氧化硅的表面改性依赖于化学反应，并且随着改性剂浓度的增加，表面改性的强度增加。通过测定它们的Zeta电位，研究了形成的二氧化硅分散体的表面电荷。此外，利用电子显微镜和动态光散射(DLS)技术对所得二氧化硅的表面形貌、分散性和粒径进行了表征。研究表明，疏水型硅烷用于水化二氧化硅的表面改性，抑制了沉淀二氧化硅的强烈团聚倾向。
Modified silicas were obtained by precipitation from aqueous solutions of sodium metasilicate and sulphuric acid. For the modification, silane coupling agents with various functional groups were applied, including aminosilane (AEAPTS), glycidoxysilane (GPTS), mercaptosilane (McPTS), and vinylsilane (VTMES). Extensive physicochemical evaluation of the obtained modified silicas was conducted, using FTIR,29Si CP MAS NMR and XPS techniques. The silica surface modification was proven to depend upon chemical reactions and to show intensity increasing with a rising concentration of a given modifier. A surface charge of the formed silica dispersions was also examined, by determining their zeta potential. Moreover, surface morphology, dispersion and particle size of the obtained silicas were evaluated, employing TEM electron microscopy and the technique of a dynamic light scattering (DLS). The studies demonstrated that application of hydrophobic type silanes for surface modification of the hydrated silicas restricted the intense tendency for agglomeration in the formed precipitated silicas.