MEDLINE Journals

    Structural, textural and adsorption characteristics of nanosilica mechanochemically activated in different media.

    Gun'ko VM, Voronin EF, Nosach LV, et al. 
    J Colloid Interface Sci 2011 Mar 15; 355(2) :300-11.

    The structural, textural, and adsorption characteristics of mechanochemically activated (MCA) fumed silica A-300 as dry or water, ethanol, or water/ethanol-wetted powders (0.5 g of a solvent per gram of silica) in a ball mill for 1-6 h were studied in comparison with those of the initial powder. The MCA treatment enhances bulk density (ρ(b)) of the powder (from 0.045 g/cm(3) for the initial silica to 0.4 g/cm(3) for 6 h-MCA-treated water-wetted silica) depending on medium type and MCA time (t(MCA)). Stronger effects are observed for the MCA treatment of water-wetted silica than of dry or ethanol- or water/ethanol-wetted samples. The MCA treatment weakly affects the specific surface area (S(BET)). However, void (pore) size distribution, porosity, particle aggregation and size distribution in aqueous suspension, behavior of interfacial water, properties of poly(vinyl alcohol)/silica composites and adsorption of gelatin depend more strongly on the t(MCA) and ρ(b) values. Some of the observed changes in the characteristics (e.g., gelatin adsorption) depend on the ρ(b) value but are independent of the medium type used on the MCA. Other characteristics are nonlinear functions of both t(MCA) and ρ(b) values.

    Particle Size
    Silicon Dioxide
    Surface Properties


    Pub Type(s)
    Journal Article Research Support, Non-U.S. Gov't
    PubMed ID


    Content Manager
    Related Content

    Relaxation phenomena in poly(vinyl alcohol)/fumed silica affected by interfacial water.

    Interaction of poly(ethylene oxide) with fumed silica.

    Towards an understanding of adsorption behaviour in non-aqueous systems: adsorption of poly(vinyl pyrrolidone) and poly(ethylene glycol) onto silica from 2H, 3H-perfluoropentane.

    Surfactant solutions and porous substrates: spreading and imbibition.

    Morphology and surface properties of fumed silicas.

    Structures of water molecules at solvent/silica interfaces.

    Effects of solid particle content on properties of o/w Pickering emulsions.

    Comparative characterization of polymethylsiloxane hydrogel and silylated fumed silica and silica gel.