Pattern formation during the drying of a colloidal suspension
Pinning of a receding contact line
Université Pierre et Marie Curie-Paris 6, Université Paris-Sud, CNRS, 91405 Orsay, France Lab. FAST, Bât. 502, Campus Université, 91405 Orsay, France
Corresponding author: email@example.com
Receding contact lines of colloidal suspensions are studied in the presence of drying, inside Hele-Shaw cells. At high velocity the contact line movement is continuous and the particle deposition is uniform. At small velocity, a periodic pinning-unpinning of the contact line is observed leading to a patterning of the substrate. We focused on the correlation between the deposition pattern and the pinning force that grows during the pinning. Our results strongly indicate that this pinning force is proportional to the macroscopic slope of the deposit and accounted by a simple capillary balance.
© EDP Sciences, Springer-Verlag, 2009