Deposition pattern of interacting droplets

Pradhan, Tapan Kumar; Panigrahi, Pradipta Kumar

doi:10.1016/j.colsurfa.2015.07.013

Cited by 51 publications

(42 citation statements)

References 45 publications

(46 reference statements)

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“…The coffee-stain effect has been used to fabricate flexible and conducting transparent sheets [13,14]. Interacting droplets have been studied [15], Sanyal et al [16] discuss dancing droplets and two-component droplets influencing each other over a distance have been demonstrated by Cira et al [17].…”

Section: Introductionmentioning

confidence: 98%

Multi-scale patterns formed by sodium sulphate in a drying droplet of gelatin

Roy

Choudhuri

Dutta

et al. 2015

Applied Surface Science

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a b s t r a c tWe present a study of patterns, formed in drying drops of aqueous gelatin solution containing sodium sulphate. The patterns are highly complex, consisting of a hierarchical sequence of rings which form concentric bands as well as dendritic crystalline aggregates. When the preparation of the complex fluid is done by mixing an aqueous solution of the salt with an aqueous solution of gelatin prepared separately, another feature is observed in the pattern on the dried out drop. This is a viscous fingering pattern, superposed on the series of rings. We try to explain the origin of these two features from a simple physical approach.

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Section: Introductionmentioning

confidence: 98%

Multi-scale patterns formed by sodium sulphate in a drying droplet of gelatin

Roy

Choudhuri

Dutta

et al. 2015

Applied Surface Science

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“…So evaporation at the near side is less than that at the far side when two drops are placed side by side. Pradhan and Panigrahi [200] give an experimental as well as a simulation study of this problem.…”

Section: Interacting Dropletsmentioning

confidence: 99%

Droplet Drying Patterns on Solid Substrates: From Hydrophilic to Superhydrophobic Contact to Levitating Drops

Tarafdar

Tarasevich

Choudhury

et al. 2018

Advances in Condensed Matter Physics

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This review is devoted to the simple process of drying a multicomponent droplet of a complex fluid which may contain salt or other inclusions. These processes provide a fascinating subject for study. The explanation of the rich variety of patterns formed is not only an academic challenge but also a problem of practical importance, as applications are growing in medical diagnosis and improvement of coating/printing technology. The fundamental scientific problem is the study of the mechanism of microand nanoparticle self-organization in open systems. The specific fundamental problems to be solved, related to this system, are the investigation of the mass transfer processes, the formation and evolution of phase fronts, and the identification of mechanisms of pattern formation. The drops of liquid containing dissolved substances and suspended particles are assumed to be drying on a horizontal solid insoluble smooth substrate. The chemical composition and macroscopic properties of the complex fluid, the concentration and nature of the salt, the surface energy of the substrate, and the interaction between the fluid and substrate which determines the wetting all affect the final morphology of the dried film. The range of our study encompasses the fully wetting case with zero contact angle between the fluid and substrate to the case where the drop is levitated in space, so there is no contact with a substrate and angle of contact can be considered as 180 ∘ .

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“…If the vapor density is not uniform, the evaporation rate of the droplet becomes non-uniform [7][8][9][10].…”

mentioning

confidence: 99%

“…Equation (10) indicates that a part of the free energy is used to deform the shape of a droplet, while it is fully used to move the droplet that is undeformable (or more rigid). Therefore, for deformable droplets, the migration velocity becomes smaller, and larger value of β S is needed to change the direction of the droplet motion.…”

mentioning

confidence: 99%

Vapor-Induced Motion of Liquid Droplets on an Inert Substrate

Man

Doi

2017

Phys. Rev. Lett.

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Evaporating droplets are known to show complex motion that has conventionally been explained by the Marangoni effect (flow induced by the gradient of surface tension). Here, we show that the droplet motion can be induced even in the absence of the Marangoni effect due to the gradient of evaporation rate. We derive an equation for the velocity of a droplet subject to non-uniform evaporation rate and non-uniform surface tension placed on an inert substrate where the wettability is uniform and unchanged. The equation explains the previously observed attraction-repulsionchasing behaviors of evaporating droplets. *

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Deposition pattern of interacting droplets

Cited by 51 publications

References 45 publications

Multi-scale patterns formed by sodium sulphate in a drying droplet of gelatin

Multi-scale patterns formed by sodium sulphate in a drying droplet of gelatin

Droplet Drying Patterns on Solid Substrates: From Hydrophilic to Superhydrophobic Contact to Levitating Drops

Vapor-Induced Motion of Liquid Droplets on an Inert Substrate

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