Abstract
The Onsager theory for the isotropic-anisotropic phase separation in a solution of rodlikeparticles is extended to the case of mixtures of such particles with different lengths. Theconcentration, composition, order parameters, and orientation dependent thermodynamicquantities of the coexisting phases are calculated for the case of a mixture of rods of two differentlengths for different length ratios. It is found that there is a significantly higher mole fraction ofthe longer rods in the anisotropic phase than in the isotropic phase. The order parameter of thelonger rods is higher than in the one component case, whereas the order parameter of the shorterrods first increases and then decreases as the mole fraction of the longer rods is increased. All thesefeatures are accentuated as the length ratio of the two kinds of rods increases.
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