Single master curve for self-diffusion coefficients in distinctly different glass-forming liquids

Self-diffusion of biomolecules in solution

A simple soft-core model potential is proposed to discuss the self-diffusion of biomolecules in solution. Extensive Brownian-dynamics simulations are performed to obtain the long-time self-diffusion coefficient. Then the simulation results are compared with the experimental data from a unified point of view recently obtained for suspensions of hard spheres. Thus, it is shown that the proposed potential can qualitatively well describe the experimental data.

Dynamics of a single atom in ternary metallic glass-forming Cu₆₀Ti(x)Zr(40-x) melts by molecular-dynamics simulations

The recently proposed universality near the glass transition [M. Tokuyama, Phys. Rev. E 80, 031503 (2009)] is tested for the dynamics of a single atom in ternary metallic glass-forming Cu₆₀Ti(x)Zr(40-x) melts by using molecular-dynamics simulations for different compositions, x = 10, 20, and 30. First, a master curve for the dynamics of the atom, such as the mean-square and mean-fourth displacements, is shown to exist independently of x if the long-time self-diffusion coefficient D(S)(L) has the same value. Second, a master curve for the temperature dependence of D(S)(L) is shown to exist independently of x. Finally, master curves for characteristic length and time scales of the atom are also shown to exist independently of x.