منابع مشابه
Pattern formation in drying drops
Ring formation in an evaporating sessile drop is a hydrodynamic process in which solids dispersed in the drop are advected to the contact line. After all the liquid evaporates, a ring-shaped deposit is left on the substrate that contains almost all the solute. Here I show that the drop itself can generate one of the essential conditions for ring formation to occur: contact line pinning. Further...
متن کاملClassifying dynamic contact line modes in drying drops.
Although the evaporation mode of sessile droplets is almost universally characterized as either constant contact radius (CCR) or constant contact angle (CCA), here we investigate two alternatives where the contact line speed is either constant or inversely proportional to the droplet radius. We present supporting evidence from our experiments on poly(ethylene oxide) (PEO) polymer solutions and ...
متن کاملDewetting Patterns in a Drying Liquid Film.
Failure of a liquid coating to remain continuous on a substrate that exhibits a significant equilibrium contact angle is a common occurrence in industrial applications. The term "reticulation" is sometimes used to describe the resulting formation of a pattern of defects. The failure may take the form of coating perforations and dewetting, and it may ultimately lead to a set of isolated drops. W...
متن کاملDrying patterns: Sensitivity to residual stresses.
Volume alteration in solid materials is a common cause of material failure. Here we investigate the crack formation in thin elastic layers attached to a substrate. We show that small variations in the volume contraction and substrate restraint can produce widely different crack patterns ranging from spirals to complex hierarchical networks. The networks are formed when there is no prevailing gr...
متن کاملRings, igloos, and pebbles of salt formed by drying saline drops.
It is well-known that evaporation of sessile drops with suspended particles like colloids and coffee powders can yield a variety of two-dimensional patterns depending on the particle shapes and internal flow patterns. Here we show that ordered three-dimensional structures can be built via evaporation of saline drops on highly hydrophobic substrates like pristine PP (polypropylene) with micropor...
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ژورنال
عنوان ژورنال: Advances in Colloid and Interface Science
سال: 2014
ISSN: 0001-8686
DOI: 10.1016/j.cis.2013.05.002