Marangoni effect reverses coffee-ring depositions.

By Hua Hu, Ronald G. Larson. Journal of Physical Chemistry B, 2006

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A mini-review: How reliable is the drop casting technique? (2020, background): “Either a small perturbation in the temperature [63] or solvents with different surface tension [64,65] may create a surface tension gradient, and thus a convective flow.”
Transport and deposition patterns in drying sessile droplets (2014, background): “ticles toward the center of the droplet, causing deposition there.(17) A “phase diagram” showing these three possibilities as functions of particle velocities induced by attraction to the surface, radial outflow due to evaporation, and Marangoni velocity, are shown in Figure 26.”
Pattern formation during the evaporation of a colloidal nanoliter drop: a numerical and experimental study (2009, methodology): “In 2006, Hu and Larson [22] observed that thermal Marangoni convection induces preferential deposition at the center of the droplet rather than at the periphery, for the case of microliter octane drops evaporating on glass coated with perfluorolauric acid (PFLA).”
Review of digital printing technologies for electronic materials (2020, background): “Marangoni effects may also influence local fluid flows along the edges due to local temperature change during evaporation [73, 74].”