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Surfactants - In Solution, at Interfaces and in Colloidal Dispersions (Hardcover)
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Surfactants - In Solution, at Interfaces and in Colloidal Dispersions (Hardcover)
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Surfactants... today you have probably eaten some, or rubbed others
on your body. Plants, animals (including you) and microorganisms
make them, and many everyday products (e.g. detergents, cosmetics,
foodstuffs) contain them. Surfactant molecules have one part which
is soluble in water and another which is not. This gives surfactant
molecules two valuable properties: 1) they adsorb at surfaces (e.g.
of an oil droplet in water), and 2) they stick together (aggregate)
in water. The aggregates (micelles) are able to dissolve materials
not soluble in water alone, and adsorbed surfactant layers, at the
surfaces of particles or (say) oil droplets in water, stop the
particles or drops sticking together. This is why stable emulsions
such as milk do not separate into layers. This book treats the
basic physical chemistry and physics underlying the behaviour of
surfactant systems. In this book, you will first learn about some
background material including hydrophobic hydration, interfacial
tension and capillarity (Section I). Discussion of surfactant
adsorption at liquid/fluid and solid/liquid interfaces is given in
Section II, and includes thermodynamics of adsorption, dynamic and
rheological aspects of liquid interfaces and the direct
characterisation of surfactant monolayers. In Section III, a
description is given of surfactant aggregation to give micelles,
lyotropic liquid crystals, microemulsions and Winsor systems. There
follows a discussion of surface forces and the way they confer
stability on lyophobic colloids and thin liquid films (Section IV).
Various dispersions stabilised by adsorbed surfactant or polymer
(including solid in liquid dispersions, emulsions and foams) are
considered in Section V. The wetting of solids and liquids is
explored in Section VI. Like surfactants, small solid particles can
adsorb at liquid/fluid interfaces, form monolayers and stabilise
emulsions and foams. Such behaviour is covered in Section VII. It
is assumed the reader has a knowledge of undergraduate physical
chemistry, particularly chemical thermodynamics, and of simple
physics. Mathematics (elementary algebra and calculus) is kept at a
level consistent with the straightforward derivation of many of the
equations presented.
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