Drying of colloidal droplets on superhydrophobic surfaces

Chen, Lifeng; Evans, Julian

doi:10.1016/j.jcis.2010.07.037

Cited by 42 publications

(28 citation statements)

References 33 publications

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“…, where C is Catalan constant and R is the wetted radius. Reported experiments provide corroboration of the proposed postulation [15,16].…”

supporting

confidence: 76%

Analysis of an Evaporating Sessile Droplet on a Non-Wetted Surface

Bhardwaj

2018

Colloid and Interface Science Communications

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We investigate evaporation of a sessile droplet on a non-wetted surface in the framework of diffusionlimited and quasi-steady evaporation. We extend previous models and numerically solve Laplace equation for the diffusion of liquid vapor in ambient. We propose a unified, simple and accurate expression of the evaporation mass flux valid for 90 o    180 o , where  is the equilibrium contact angle. In addition, using the derived expression of the evaporation mass flux, we propose a simple and accurate expression of the evaporation mass rate for a non-wetted surface, which does not exhibit singularity at  = 180 o . Finally, using the scaling analysis, the expression of the evaporation mass flux is utilized to estimate the direction and magnitude of the characteristic evaporation-driven flow velocity inside the droplet on a non-wetted surface. The predicted flow direction is found to be consistent with the previous measurements.

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“…, where C is Catalan constant and R is the wetted radius. Reported experiments provide corroboration of the proposed postulation [15,16].…”

supporting

confidence: 76%

Analysis of an Evaporating Sessile Droplet on a Non-Wetted Surface

Bhardwaj

2018

Colloid and Interface Science Communications

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“…The morphology of films obtained from the precipitation of a colloidal solution within a drying droplet generally depends on the wetting properties of the surface 33 as well as on its tilt angle. 34 In particular, the coffee ring effects are exacerbated for pendant droplets and on hydrophobic surfaces.…”

Section: Resultsmentioning

confidence: 99%

Preventing the coffee-ring effect and aggregate sedimentation by in situ gelation of monodisperse materials

Buesen

Williams

et al. 2018

Chem. Sci.

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“…The drying patterns of colloidal droplets depend on the particle-particle interactions and are significantly affected by the substrates as well. With the increase of substrate contact angle, the final residue pattern can be coffee-ring-like stains (Figure 10(a)) on hydrophilic substrate [37] and bowl-shaped residue (Figure 10(b)) on a hydrophobic substrate (Θ ∼ 90 ∘ ) [67]. Under acoustic levitation, a ring-shaped residue has been obtained ( Figure 10(c)) [68], which exhibits a geometrical similarity with the initial dog-bone shape of the acoustically levitated droplet [191].…”

Section: Evaporation Of Drops Under Levitationmentioning

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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Drying of colloidal droplets on superhydrophobic surfaces

Cited by 42 publications

References 33 publications

Analysis of an Evaporating Sessile Droplet on a Non-Wetted Surface

Analysis of an Evaporating Sessile Droplet on a Non-Wetted Surface

Preventing the coffee-ring effect and aggregate sedimentation by in situ gelation of monodisperse materials

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

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