Physics – Condensed Matter
Scientific paper
1996-03-08
Physics
Condensed Matter
38 pages (TeX) for Encyclopedia of Applied Physics
Scientific paper
Traditionally, solubility and mixing belong to the realm of chemistry and material sciences and many standard textbooks on physical chemistry treat this problem, usually within the scope of thermodynamics. Here apart from thermodynamics we shall discuss other issues such as: the statistical mechanics theories of mixtures, relation between intermolecular interactions and demixing, coupling between ordering and demixing, and kinetics of demixing which includes spinodal decomposition in binary liquid mixtures. The following special examples will be discussed: polymer blends,diblock copolymers, liquid crystals, and ternary mixtures including surfactants (amphiphiles). Within the scope of physics of solubility and mixing one can study such diverse phenomena as: mixing of two simple liquids, collapse of the polymer chain in the solvent, flocculation of colloidal particle upon the addition of the polymer chains, mixing of two polymer components in a liquid state, ordering of copolymers and ternary mixtures of oil, water and surfactant or formation of micelles in aqueous solutions. In reality, very rarely we have completely pure substances, thus the properties of mixtures and the phenomenon of mixing and demixing are of prime importance for science and technology.
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