Ring to Mountain Transition in Deposition Pattern of Drying

Abstract

When a droplet containing a non-volatile component is dried on a substrate, it leaves a ringlike deposit on the substrate. We propose a theory which predicts the deposit distribution based on a model of fluid flow and contact line motion of the droplet. It is shown that the deposition pattern changes continuously from coffee-ring to volcano-like and to mountain-like depending on the mobility of the contact line and the evaporation rate. Analytical expression is given for the peak position of the distribution of deposit left on the substrate.

12 pages, 4 figures

References in corpus (4)

• Order-to-disorder transition in ring-shaped colloidal stains
• A variational approach to the moving contact line hydrodynamics
• Dynamical model for the formation of patterned deposits at receding contact lines
• Growth of solid conical structures during multistage drying of sessile poly(ethylene oxide) droplets

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• From coffee stains to uniform deposits: significance of the contact-line mobility
• Application of Onsager Machlup integral in solving dynamic equations in non-equilibrium systems
• Effective boundary conditions for dynamic contact angle hysteresis on chemically inhomogeneous surfaces
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• An efficient diffusion generated motion method for wetting dynamics
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• Power-law scaling for solid-state dewetting of thin films: an Onsager variational approach
• Theoretical analysis for flattening of a rising bubble in a Hele-Shaw cell