抄録
A simple model is developed to describe the adsorption and the surface ordering on solutions of rigid-rod-like molecules. We here focus on the plalar adsorption of the rigid rods restricted the orientations to two mutually orthogonal directions; two parallel to the surface. When the bulk concentration increases, the adsorbed amount is increased and the adsorption isotherm has a kink at a bulk concentration φc where the isotropic-nematis transition(INT) in a surface phase takes plece. Further increasing concentration, the adsorbed amount jumps at the bulk critical concentration φIN, where the INT takes places in the bulk phase. For the range of concentrarion φc < φ < φIN, we find the wetting of an isotropic bulk phase by a nematic surface phase. For various values of the axial ratio of the rigid rods, the solvent conditions and the adsorption energy, we examine the adsorption isotherms and the surface ordering. We also disscuss on the co-occurences between adsorption phenomena and the phase separations of surface phases.
