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

Journal of Colloid and Interface Science
V M Gun'koS V Mikhalovsky

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, (1)H NMR, and Raman spectroscopies, XRD, and ab initio quantum-chemical calculations. The specific surface area S(BET,X)-to-S(BET,N(2)) ratio (X is an organic adsorbate) changes from 0.68 for hexane adsorbed onto amorphous SA8 (degassed at 200 degrees C) to 1.85 for acetonitrile adsorbed onto crystalline alumina (degassed at 900 degrees C). These changes are relatively large because of variations in orientation, lateral interactions, and adsorption compressing of molecules adsorbed onto oxide surfaces. Larger S(BET,X)/S(BET,N(2)) 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 adsorbate...Continue Reading

References

Jan 23, 2001·The Journal of Biological Chemistry·E ShpakM J Kieliszewski
Sep 6, 2003·Journal of Colloid and Interface Science·J ChomaM Jaroniec
Aug 2, 2006·Advances in Colloid and Interface Science·Sudam K ParidaB K Mishra
Jun 9, 2009·Journal of Colloid and Interface Science·Pierre LetellierMireille Turmine

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Citations

Jan 27, 2015·Journal of Nanoparticle Research : an Interdisciplinary Forum for Nanoscale Science and Technology·Małgorzata WiśniewskaVladimir Iljich Zarko
Jun 28, 2016·Advances in Colloid and Interface Science·V M Gun'koJ P Blitz
Feb 1, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Razan FatehDetlef Bahnemann

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