  We present a coarse-graining strategy for reducing the number of particle
species in mixtures to achieve a simpler system with higher diffusion while
preserving the total particle number and characteristic dynamic features. As a
system of application, we chose the bidisperse Lennard-Jones-like mixture
discovered by Kob and Andersen [Phys. Rev. Lett. 73, 1376 (1994)] possessing a
slow dynamics due to the fluid's multi-component character with its apparently
unconventional choice for the pair potential of the type-A-type-B arrangement.
We further established in a so-formed coarse-grained and
temperature-independent monodisperse system an equilibrium structure with a
radial distribution function resembling its mixture counterpart. This
one-component system further possesses similar dynamic features like glass
transition temperature and critical exponents while subjected to Newtonian
mechanics. This strategy may finally lead to the manufacturing of new
nanoparticle/colloidal fluids by experimentally modeling only the outcoming
effective pair potential(s) and no other macroscopic quantity.
