Molecular Theory on Binary Mixtures of Hard Rods in an External Field(Condensed Matter : Structure, Mechanical and Thermal Properties)

概要

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We study isotropic-nematic (Iso-N) phase transition in mixtures of hard rods of different lengths L_A and L_B in an external field by using the symmetry breaking potential method with the mean field approximation. We discuss effect of the external field on a triple point and phase co-existence regions. Iso + N + N triple point, which appears on phase diagram in the pressure-composition plane for mixtures showing N + N co-existence, is moved to shorter rod side on the phase diagram by the external field. We find for the case of L_A/L_B = 4 that, depending on pressure, three types appear for phase diagrams in the external field-composition plane. One type shows Iso + N co-existence region that has upper critical solution field, another shows Iso + N and N + N co-existence region critical solution field of which is higher than critical field of monodisperse shorter rods, and the other shows Iso + N + N triple point.
社団法人日本物理学会の論文
2004-10-15