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Ring-stains are seen when droplets of liquid containing particles are left to dry on a surface: a pinned contact line leads to outward radial flow, which is enhanced by the diverging evaporative flux at the contact line.
As a result, suspended particles in the drops are transported to the edge of the droplet, and deposited in a circular stain.
We have characterized the topologies of the deposit using skewness of the profile as a simple analytic method for quantifying the shapes: pillars produce positive, flat deposits have zero skew and ring stain have a negative skew.
Yohana Msambwa received B.Sc with Education and M.Sc.
degree from the University of Dar Es Salaam in Tanzania; the Ph.D.
degree in physics from the Nottingham Trent University, United Kingdom in 2016.
In 2006 he joined the Dar es Salaam University College of Education, a constituent college of University of Dar Es Salaam.
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