New organic/inorganic hybrid systems were obtained by chemical or mechanical modification of magnesium silicate surface with selected PUSS, and then characterized. Magnesium silicate was precipitated in a water system. The effect of modification of the magnesium silicate surface on its physicochemical properties was determined. Functionalization was carried out with the use of selected PUSS: octakis(methacryloxypropyl)octakisilsesquioxane and octakis(dimethylsiloxy, 3-glycidoxypropyl)octasilsesquioxane. The organic/inorganic hybrid systems were characterized through determination of their particle size and tendency to form agglomerates using scanning electron microscopy (SEM) and transmission electron microscopy (TEM), the non-invasive backscattering method (NIBS) and a laser diffraction technique. The adsorption properties of the systems were evaluated on the basis of nitrogen adsorption/desorption isotherms, specific surface area, pore volume and size. Water wettability profiles were also examined. Additionally, thermal stability was measured by thermogravimetric (TGA) analysis. To evaluate the effectiveness of the applied chemical modification, the hybrids underwent FT-IR testing and determination of the degree of surface coverage based on elemental contents. (C) 2012 Elsevier B.V. All rights reserved.