title: Effect of low frequency ultrasound on the surface properties of natural aluminosilicates.
abstract: Structural and surface properties of different natural aluminosilicates (layered, chain and framework structural types) exposed of 20 kHz ultrasound irradiation (0-120 min) in aqueous and 35 wt%. aqueous H2O2 dispersions were studied by X-ray diffraction (XRD), dynamic light scattering (DLS), nitrogen adsorption-desorption, thermal analysis, and Fourier transform infrared spectroscopy (FTIR) techniques. It was confirmed that sonication caused slight changes in the structure of investigated minerals whereas their textural properties were significantly affected. The aqueous dispersions of montmorillonite (Mt), clinoptilolite (Zlt), glauconite (Glt) and palygorskite (Pal) were represented by several particles size fractions according to DLS-study. Ultrasound irradiation produced a decrease of the average particle diameter by 4-6 times in water and by 1.3-5 times in H2O2 dispersions except for Pal, which underwent strong agglomeration. A significant increase of total pore volume and pore diameter was observed for Glt sonicated in H2O2 dispersions whereas for Pal mainly micropore volume sharply increased in both aqueous and H2O2 dispersions.
authors.affiliation: Voronezh State University of Forestry and Technologies, 8 Timiryazeva Str., 394087 Voronezh, Russian Federation. Electronic address: novikov-la@yandex.ru.
authors.forename: Liudmila
authors.initials: L
authors.lastname: Novikova
authors.affiliation: Institut de Chimie des Milieux et Matériaux de Poitiers (IC2MP, UMR CNRS 7285), Université de Poitiers, 1, Rue Marcel Doré, TSA 41105, 86073 Poitiers Cedex 9, France.
authors.forename: Philippe
authors.initials: P
authors.lastname: Ayrault
authors.affiliation: Institut de Chimie des Milieux et Matériaux de Poitiers (IC2MP, UMR CNRS 7285), Université de Poitiers, 1, Rue Marcel Doré, TSA 41105, 86073 Poitiers Cedex 9, France.
authors.forename: Claude
authors.initials: C
authors.lastname: Fontaine
authors.affiliation: Institut de Chimie des Milieux et Matériaux de Poitiers (IC2MP, UMR CNRS 7285), Université de Poitiers, 1, Rue Marcel Doré, TSA 41105, 86073 Poitiers Cedex 9, France. Electronic address: gregory.chatel@univ-poitiers.fr.
authors.forename: Gregory
authors.initials: G
authors.lastname: Chatel
authors.affiliation: Institut de Chimie des Milieux et Matériaux de Poitiers (IC2MP, UMR CNRS 7285), Université de Poitiers, 1, Rue Marcel Doré, TSA 41105, 86073 Poitiers Cedex 9, France.
authors.forename: François
authors.initials: F
authors.lastname: Jérôme
authors.affiliation: Voronezh State University of Forestry and Technologies, 8 Timiryazeva Str., 394087 Voronezh, Russian Federation.
authors.forename: Larisa
authors.initials: L
authors.lastname: Belchinskaya
keywords: Decrease of particles size; Dispersions; Hydrogen peroxide; Natural aluminosilicates; Surface and structural characteristics; Ultrasound