NDLI: Sol-gel processes and aggregative stability of lyophilic inorganic colloids

Content Provider	IEEE Xplore Digital Library
Author	Shabanova, M.A.
Copyright Year	1994
Description	Author affiliation: D. Mendeleyev University of Chemical Technology (Shabanova, M.A.)
Abstract	Summary form only given. Colloid silica is a convenient model for the investigation of sol-gel processes in inorganic oxides. The kinetics of sol formation and that of sol to gel transition is considered in terms of physical and chemical processes. The existence of the homogeneous polycondensation and phase formation stages as well as the stage of particles' growth has been shown experimentally. We have shown the necessity to distinguish the kinetic regularities of polycondensation, gelation and sols' aggregative stability. Controlling gel formation stage in the systems involved is not a chemical reaction associated with sylanolic groups reactivity but a physical process i.e. coagulation as a result of the action of the forces of molecular attraction between particles. Colloid silica properties occuring in the systems should be considered in terms of the structure and properties of liquid boundary layers. With pH increasing hydrate layers destruction on the articles occurs accompanied by the electrical potential growth leading to the competitive influence of electrostatic and non-electrostatic stabilizing factors. The ideas were proved in terms of DLVO theory by the data on the modifying additives. Coagulation processes at gel formation stage influence dissolved silica mass transfer under isothermic recondensation and determine silica gel porous structure formation.
Starting Page	305
Ending Page	305
File Size	108152
Page Count	1
File Format	PDF
DOI	10.1109/STSM.1994.835343
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1994-07-24
Publisher Place	Korea
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Silicon compounds Electric potential Stability Coagulation Kinetic theory Electrostatics Chemical technology Tellurium
Content Type	Text
Resource Type	Article

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