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Synopsis:
This text introduces undergraduate and graduate
students to the field of colloids applied to materials processing,
better known as sol-gel processing. It is written for engineering
or science students in the fields of chemical engineering, materials
processing, ceramics engineering, colloid science and mineral
chemistry. However, the most important facts about the most recent
developments, including mixed organic-inorganic sol-gels known
as hybrid materials and the use of surfactants and micelles, are
addressed. More precisely, the book focuses on gathering the main
theories related to sol-gel processing in a comprehensive manner,
so as to provide the most important scientific basis to students.
The book is organized in such a way that each chapter corresponds
to one of the main steps in a chronological order of application
of sol-gel techniques to the synthesis of materials. The book
first presents elementary solvent chemistry, in particular the
partial charge model theory. Next, theories on the nucleation
and growth of particles and on the steric or electrostatic stabilization
(also known as DLVO theory) of colloidal suspensions, are gathered
in a chapter on colloidal particles. Another chapter is devoted
to the theories on gelation. Gels, their structure and properties
at large such as their swelling, shrinkage or drying behaviour,
also constitute an important chapter. After drying, gels become
almost traditional ceramic materials and they are often submitted
to thermal treatments during which they can phase-transform and
sinter. Two chapters offer an opportunity to gather the main theories
related to these two fields. Finally, the main applications are
reviewed according to the domains of application, particularly
for coatings, filtering membranes, and catalysts.
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