ABSTRACT
Surface Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 467
SEi Reactions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 472
AdN Reactions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 478
AdN,E Reactions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 479
SNi Reactions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 479
Decomposition of Surface Functionalities . . . . . . . 481
Applications of Modified Silicas . . . . . . . . . . . . . . . 486
Adhesion of Filled Coatings . . . . . . . . . . . . . . . . . . 489
Water Absorption by Filled Films . . . . . . . . . . . . . 490
Light Resistance of Filled Films . . . . . . . . . . . . . . . 491
Corrosion Resistance of the Coatings with Filled
Polymers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 492
Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 494
Acknowledgment . . . . . . . . . . . . . . . . . . . . . . . . . . . 494
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 494
Unmodified and modified fumed silicas are widely used as
fillers, additives, thickeners, adsorbents, carriers, and so on
[1-11]. Chemical modification of the fumed silica surfaces
with respect to silanol and siloxane bonds by different reac-
tants (organic, hetero-organic, and inorganic compounds)
as well as preparation of nonstandard fumed silicas
allows us to extend applications of these materials in medi-
cine, biotechnology, environmental and human protection,
and industry [11], since the surface properties of modified
silicas differ substantially from those of pristine oxide
materials that was clearly shown by Iler and other authors
[1-11]. The classification of chemical reactions occurring
at the silica surfaces has a long history incipient from the
classifications of reactions of both organic and organosili-
con compounds but revised with respect to interface pro-
cesses and justified on the basis of investigations
performed by experimental (such as reaction kinetics,
TPD MS, spectroscopy, etc.) and theoretical (quantum
chemistry, MC modeling, etc.) methods [1-11]. Therefore
a major portion of the reaction mechanisms characteristic
for the silica surfaces is listed below with a brief
description.
