详细记录  
题名:Surface structure and properties of mixed fumed oxides.
作者:Gun'ko VM, Ptushinskii YG, Mishchuk OA, Pakhovchishin SV, Gorbik PP, Blitz JP, Gude K, Zarko VI, Goncharuk EV, Nychiporuk YM, Leboda R, Skubiszewska-Zieba J, Osovskii VD,
来源:J Colloid Interface Sci. 2007 Jun 12;[IF= 2.02]
URL :http://dx.doi.org/10.1016/j.jcis.2007.05.025
日期:070630
摘要: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.

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