Abstract
The external field induced paranematic–nematic phase separation of hard spherocylinder systems is studied using the Onsager and Parsons free-energy functionals. A bifurcation analysis is carried out in the context of the Onsager theory at an infinitesimal external field. The bifurcation concentration is found to decrease with increasing field strength. Below the critical field strength, van der Waals-like loops are found. The molecular aspect ratio dependence of the phase coexistence curves of hard spherocylinders also is investigated. The critical field strength is found to decrease with decreasing aspect ratio. The external field dependence of the order parameter along the paranematic–nematic phase equilibrium curve is also studied.
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