Gun'ko V M, Blitz J P, Gude K, Zarko V I, Goncharuk E V, Nychiporuk Y M, Leboda R, Skubiszewska-Zieba J, Osovskii V D, Ptushinskii Y G, Mishchuk O A, Pakhovchishin S V, Gorbik P P
Institute of Surface Chemistry, 17 General Naumov Street, Kiev 03164, Ukraine.
J Colloid Interface Sci. 2007 Oct 1;314(1):119-30. doi: 10.1016/j.jcis.2007.05.025. Epub 2007 Jun 13.
A variety of fumed oxides such as silica, alumina, titania, silica/alumina (SA), silica/titania (ST), and alumina/silica/titania (AST) were characterized. These oxides have different specific surface areas and different primary particle composition in the bulk and at the surface. These materials were studied by FTIR, NMR, Auger electron spectroscopy, one-pass temperature-programmed desorption with mass spectrometry control (OP TPDMS), microcalorimetry, and nitrogen adsorption. Nonlinear changes in the surface content of alumina in SA and AST and titania in ST and AST samples with increasing oxide content along with simultaneous changes in their specific surface area cause complex dependencies of the heat of immersion in water and desorption of water on heating on the structural parameters. Simultaneous analysis of changes in the surface phase composition, in the concentration of hydroxyls, and in the structural characteristics reveals that at a low content of the second phase the structural characteristics (e.g., S(BET)) are predominant; however, at a large content of these oxides the phase composition plays a more important role.
对多种气相法氧化物进行了表征，如二氧化硅、氧化铝、二氧化钛、硅铝（SA）、硅钛（ST）和铝硅钛（AST）。这些氧化物在本体和表面具有不同的比表面积和不同的初级颗粒组成。通过傅里叶变换红外光谱（FTIR）、核磁共振（NMR）、俄歇电子能谱、带质谱控制的单程程序升温脱附（OP TPDMS）、微量热法和氮气吸附对这些材料进行了研究。SA和AST中氧化铝以及ST和AST样品中二氧化钛的表面含量随氧化物含量增加呈非线性变化，同时其比表面积也发生变化，这导致水的浸入热和加热时水的脱附对结构参数呈现复杂的依赖性。对表面相组成、羟基浓度和结构特征变化的同时分析表明，在第二相含量较低时，结构特征（如比表面积S(BET)）占主导；然而，当这些氧化物含量较高时，相组成起着更重要的作用。
