| After reviewing a number of experiments on evaporating and dewetting thin layers of suspensions and solutions we first briefly discuss microscale discrete (KMC) and continuous (DDFT) approaches to describe the occuring evaporative dewetting fronts and their instabilities [1]. Second we present a mesoscale hydrodynamic (thin film) model that allows us to discuss the self-pinning depinning cycles of a contact line related to the emergence of periodic deposit structures. Next, the limits of the presented approaches are layed out and a 'thermodynamic' re-formulation of the mesoscopic hydrodynamic model is proposed as a gradient dynamics based on an underlying free energy. It allows for a systematic incorporation of several additional physical effects as, e.g., solute-solvent decomposition and solute-dependent wettability [4]. Finally, the latter case is used to discuss a dewetting mode of a thin film of a mixture, suspension or solution that has no equivalent in the dewetting of a pure liquid. [1] I. Vancea et al., Phys. Rev. E 78, 041601 (2008); A. Archer, M. Robbins and U. Thiele, Phys. Rev. E 81, 021602 (2010); M. Robbins, A. Archer and U. Thiele, J. Phys.: Condens. Matter 23, 415102 (2011). [2] L. Frastia, A. Archer, U. Thiele, Phys. Rev. Lett. 106, 077801 (2011); Soft Matter 8, 11363-11386 (2012). [3] U. Thiele, Eur. Phys. J. Special Topics, 197, 213-220 (2011); U. Thiele, A. J. Archer and M. Plapp, Phys. Fluids 24, 102107 (2012). [4] D. Todorova, H. Lopez and U. Thiele (in preparation) Complete titles/links can be found under www.uwethiele.de/publ.html |
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