Adsorption of polar and nonpolar compounds onto complex nanooxides with silica, alumina, and titania

Gun'ko, V.M., Yurchenko, G.R., Turov, V.V., Goncharuk, E.V., Zarko, V.I., Zabuga, A.G., Matkovsky, A.K., Leboda, R., Skubiszewska-Zęiba, J., Janusz, W., Phillips, G.J. and Mikhalovsky, S.V. (2010) Adsorption of polar and nonpolar compounds onto complex nanooxides with silica, alumina, and titania Journal of Colloid and Interface Science, 348 (2). pp. 546-558. ISSN 0021-9797

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Abstract

Adsorption of low-molecular adsorbates (nonpolar hexane, nitrogen, weakly polar acetonitrile, and polar diethylamine, triethylamine, and water) onto individual (silica, alumina, titania), binary (silica/alumina (SA), silica/titania (ST)), and ternary (alumina/silica/titania, AST) fumed oxides was studied to analyse the effects of morphology and surface composition of the materials. Certain aspects of the interfacial phenomena dependent on the structural characteristics of oxides were analysed using calorimetry, 1H NMR, and Raman spectroscopies, XRD, and ab initio quantum-chemical calculations. The specific surface area SBET,X-to-SBET,N2 ratio (X is an organic adsorbate) changes from 0.68 for hexane adsorbed onto amorphous SA8 (degassed at 200 °C) to 1.85 for acetonitrile adsorbed onto crystalline alumina (degassed at 900 °C). These changes are relatively large because of variations in orientation, lateral interactions, and adsorption compressing of molecules adsorbed onto oxide surfaces. Larger SBET,X/SBET,N2 values are observed for mixed oxides with higher crystallinity of titania or/and alumina phases in larger primary nanoparticles with greater surface roughness and hydrophilicity. Polar adsorbates can change the structure of aggregates of oxide nanoparticles that can, in turn, affect the results of adsorption measurements.

Item Type:Journal article
Uncontrolled Keywords:Oxide nanoparticles; Complex fumed oxides; Structural characteristics; Nonpolar adsorbates; Polar adsorbates; Interfacial phenomena
Subjects:C000 Biological and Biomedical Sciences
DOI (a stable link to the resource):10.1016/j.jcis.2010.04.062
Faculties:Faculty of Science and Engineering > School of Pharmacy and Biomolecular Sciences
ID Code:7744
Deposited By:editor spbs
Deposited On:28 Sep 2010 16:07
Last Modified:24 Apr 2012 10:11

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