Everything about Lyotropic totally explained
A material is called
lyotropic if it forms
liquid crystal phases because of the addition of a
solvent. Historically the term was used to describe materials composed of
amphiphilic molecules. Such molecules comprise a water-loving '
hydrophilic' head-group (which may be ionic or non-ionic) attached to a water-hating '
hydrophobic' group. Typical hydrophobic groups are saturated or unsaturated hydrocarbon chains. Examples of amphiphilic compounds are the salts of fatty acids, phospholipids. Many simple amphiphiles are used as
detergents.
Lyotropic liquid crystal phases in these materials are formed by a process of self-assembly that's driven by the
hydrophobic effect.
The term lyotropic has also been applied to the liquid crystalline phases that are formed by certain polymeric materials, particularly those consisting of rigid rod-like macromolecules, when they're mixed with appropriate solvents. Examples are
suspensions of rod-like
viruses as the
Tobacco Mosaic Virus as well as man-made
colloidal suspensions of non-spherical colloidal particles. Other examples include
DNA and
Kevlar, which dissolves in
sulfuric acid to give a lyotropic phase. It is noted that in these cases the solvent acts to lower the melting point of the materials thereby enabling the liquid crystalline phases to be accessible. These liquid crystalline phases are closer in architecture to
thermotropic liquid crystalline phases than to the conventional lyotropic phases. In contrast to the behaviour of amphiphilic molecules, the lyotropic bhaviour of the rod-like molecules doesn't involve self-assembly.
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