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We use Molecular Dynamics combined with Dissipative Particle Dynamics toconstruct a model of a binary mixture where the two species differ only intheir dynamic properties (friction coefficients). For an asymmetric mixture ofslow and fast particles we study the interdiffusion process. The relaxation ofthe composition profile is investigated in terms of its Fourier coefficients.While for weak asymmetry we observe Fickian behavior, a strongly asymmetricsystem exhibits clear indications of anomalous diffusion, which occurs in acrossover region between the Cases I (Fickian) and II (sharp front moving withconstant velocity), and is close to the Case II limit.Comment: to appear in J. Chem. Phy

Non-Fickian interdiffusion of dynamically asymmetric species: A molecular-dynamics study