Adsorption on Silica Surfaces

of the surface oxygens to form two bonds as other atoms in the interior. The proton of the large oxygen ion as of the extending

of the two atoms of the diatomic molecule. The relation between the force constant, k, and can be of light (3 x 10em s-), and of two differ- vJ!v= If the OH group is treated as a simple diatomic harmonic oscillator, thus for =deuterium) we have (f.loo/J.loH)1=(16j9x17j16)!=

of Chemistry, M. V. Lomonosov of silica adsorbents 63 of surface silanol group concentration on silica 72

of deuterium exchange reaction of hydroxyl groups on adsorbent surface a

of stereology and mathematical morphology

of Adsorption and Planar Chromatography, of silica gel 167

of Technology, Atlanta, Georgia

Silicas Comte-UFR Sciences et of Amorphous Silica 299

of the dispersion was adjusted by using ion exchange resins (Persello and of the pH on the electrophoretic of the silica, as a function of the ionic strength. The effect of pH can be of the ionization of the surface groups. We shall define two

Silica in Mixtures and Water of Electrochemistry, Technical University of of Physical Chemistry, Abo Akademi,

of Perugia, Perugia, Italy of Heterogeneous Catalysis

... 0 ... Si + N0--+ Si-O-O-Si=+N C0forming a kind of organic carbonate, =Si Si= +C0 -Si-0-C(0)-0-Si= Strain of SSCs. In fact, the aerogel +CO--+(- -h--+ 0)Si · · -0" "0- -0" "0 -Si(O- "[OCO]Si(O-h

Silica of Electrochemistry, Technical University of

of zero charge (PZC). Tadros and Lyklema [3) and of the aof silica below pH 3; also the electrokinetic of silica at very low pH values is positive [5). Recently Koopal [6] has of silica can be only negative and at

of adsorbed cations, and a of the initial concentration of heavy metal cations. When

Suspensions of Adsorbed Polymer and

of PEO of the thickness with time is measured with PEO layers of high molar mass. The reduction becomes lower with increasing excess of the ·-·----.

Enzymes and Other Natural Macromolecules on Silicas of Sciences, Kiev, Ukraine

of biologically active compounds. of serious

Chains on Plane Silica Surfaces

of polymer left bound to silica is a strongly decreas- of immersion time in the presence of ammonia. Further investigations of the silica surface can be based on the competitive adsorption of hydroxyl functions is of short chains per gram of silica, ¢

Surface Processes of Torino, Torino, Italy

of otherwise direct membranolytic action of some mineral of that surfactant have been shown to rapidly adsorb to the silica surface

of catalytically active species into of mesoporous silica (see Fig. 5). of different species have been incorporated into a mesoporous matrix

Large Surface-to-Volume Ratio Problems in Finely Divided Aqueous Systems: Implications for Atmosphere of Physics, University of Helsinki, Helsinki, Finland