Abstract
The present study investigated a drying behavior and film formation of a particle suspension droplet on a patterned substrate with a single line-shaped hydrophilic region. The effect of particle concentration in a droplet on the film formation and contact line behavior during drying was examined. The droplet on the patterned droplet showed a slight spread along the line-shaped hydrophilic region. Although a pure water droplet showed a rapid spread on the hydrophilic region near the termination of drying, a particle suspension droplet showed the contact line pinning on the hydrophilic region throughout the drying. This may be because that the particles deposited on the hydrophilic region inhibited the contact line spreading.
