Molecular Dynamics of Structural Organization in Binary Fluids with Fixed Particles

We have numerically studied the structural organization in binary immiscible fluids with fixed particles. The particles that have a finite excluded volume and a selective affinity for one fluid component have the significant influence on the organization process, where the hydrodynamic flows induced by the interface motion are suppressed and the domain growth is slowed down at late stages. Two different cases with weak and strong preferential interactions are considered, and the results show that the particles in the former can be left in the unfavorable phase during the process but are permanently surrounded by the favorable phase in the latter. The study indicates that the system would develop into a dynamical steady state and the final domain size might be dependent not only on the number of particles but also on the preferential interaction strength.