  During drying of colloidal suspensions, colloidal particles can form
concentrated particle layers beneath the receding free surface. The drying rate
can gradually decrease with the growth of the particle layers. We construct a
model to investigate how such drying characteristics is affected by
interactions between particles. In this model, the formation of the particle
layers is described by Langevin dynamics simulations, and the drying rate is
evaluated from the permeation resistance of the particle layers. We show that
the decrease in the drying rate is suppressed when the particles form
aggregates by attractive interactions. The present model would enable us to
predict and control the drying characteristics through the character of
colloidal particles.
