Contact line deposits in an evaporating drop

Deegan, Robert D.; Bakajin, Olgica; Dupont, Todd; Huber, Greg; Nagel, Sidney R.; Witten, Thomas A.

doi:10.1103/physreve.62.756

Cited by 2,025 publications

(2,596 citation statements)

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“…Finally, there is a wide body of literature concerning the application of hydrodynamic models to the problem of film drying [26,27]. These models explicitly account for the motion of the liquid phase and have been used to understand flow-driven solute deposition, e.g., the coffee-stain effect [28,29,30,31]; skin formation [32,33]; and the onset of Marangoni instabilities caused by composition gradients at the evaporating surface [34,35,36,37,38].…”

Section: Introductionmentioning

confidence: 99%

A minimal model for solvent evaporation and absorption in thin films

Hennessy

Ferretti

Cabral

et al. 2017

Journal of Colloid and Interface Science

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We present a minimal model of solvent evaporation and absorption in thin films consisting of a volatile solvent and nonvolatile solutes. An asymptotic analysis yields expressions that facilitate the extraction of physically significant model parameters from experimental data, namely the mass transfer coefficient and composition-dependent diffusivity. The model can be used to predict the dynamics of drying and film formation, as well as sorption/desorption, over a wide range of experimental conditions. A state diagram is used to understand the experimental conditions that lead to the formation of a solute-rich layer, or "skin", at the evaporating surface during drying. In the case of solvent absorption, the model captures the existence of a saturation front that propagates from the film surface towards the substrate. The theoretical results are found to be in excellent agreement with data produced from dynamic vapour sorption experiments of ternary mixtures comprising an aluminum salt, glycerol, and water. Moreover, the model should be generally applicable to a variety of practical contexts, from paints and coatings, to personal care, packaging, and electronics.

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Section: Introductionmentioning

confidence: 99%

A minimal model for solvent evaporation and absorption in thin films

Hennessy

Ferretti

Cabral

et al. 2017

Journal of Colloid and Interface Science

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“…For an evaporating drop, one would guess naively that the surface area governs the evaporation rate; however for drops smaller than about a centimeter in a temperaturecontrolled environment, detailed experiments show that the rate is proportional to the drop radius R for both pinned (Deegan et al 2000b;Crafton & Black 2004;David et al 2007;Gelderblom et al 2011) and moving contact lines (Cachile et al 2002a,b;Poulard et al 2003;Shahidzadeh-Bonn et al 2006;Starov & Sefiane 2009). In fact, in the regime of slow evaporation considered here the evaporation is quasi-steady (Cazabat & Guéna 2010;Stauber et al 2015), hence evaporation rates are defined by the instantaneous drop shapes.…”

Section: Introductionmentioning

confidence: 99%

Evaporation of water: evaporation rate and collective effects

et al. 2016

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: http://www.bristol.ac.uk/pure/about/ebr-terms We study the evaporation rate from single drops as well as collections of drops on a solid substrate, both experimentally and theoretically. For a single isolated drops of water, in general the evaporative flux is limited by diffusion of water through the air, leading to an evaporation rate that is proportional to the linear dimension of the drop. Here we test the limitations of this scaling law for several small drops, and for very large drops. We find that both for simple arrangements of drops, as well as for complex drop size distributions found in sprays, cooperative effects between drops are significant. For large drops, we find that the onset of convection introduces a length scale of about 20 mm in radius, below which linear scaling is found. Above this length scale, the evaporation rate is proportional to the surface area.

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“…It is well known that the withdrawing contact line in a drying droplet of colloidal suspensions shows pattern formations such as coffee ring, branch, and network structures [16][17][18][19]. In addition, the mechanisms of particle aggregation have been studied with regard to diffusion-limited aggregation (DLA) and cluster-cluster aggregation (CCA), although the simulations were carried out in the bulk phase [24][25][26][27].…”

Section: Wetting Behavior Of Colloidal Dispersions With Thickeningmentioning

confidence: 99%

“…The migration is caused by an outward flow within the drop that is driven by the loss of solvent (through evaporation) and geometrical constraints requiring that the drop maintain an equilibrium droplet shape with a fixed boundary [16][17][18][19]. The dewetting causes the formation of finger-like patterns near the contact line which leave behind a deposit of branches.…”

Section: Introductionmentioning

confidence: 99%

Wetting dynamics of colloidal dispersions on agar gel surfaces

Seino

Chida

Mayama

et al. 2014

Colloids and Surfaces B: Biointerfaces

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Statistical summary:The total number of words = 4700The total number of tables = 1The total number of figures = 5 2 / 27 ABSTRACT We have analyzed the effects of the addition of silica particles on the wetting velocity at flat and fractal agar gel surfaces and the applicability of such particles for controlling the wetting dynamics of water. We found that the contact angle (θ D ) of colloidal dispersions followed the power law θ D ∝ t −x , where t and x are time and a constant. The wetting is inhibited by the addition of a suitable amount of silica particles with a diameter of 20 nm. Specifically, the lowest value for the exponent x occurred when the silica composition was 0.1 wt%. However, such inhibition effects were not observed on the addition of silica particles with a diameter of 100, 550 and 1000 nm. The mechanism of inhibition of the wetting of liquids on gel surfaces can be attributed to slight increase in the local viscosity around the contact line during wetting.

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Contact line deposits in an evaporating drop

Cited by 2,025 publications

References 14 publications

A minimal model for solvent evaporation and absorption in thin films

A minimal model for solvent evaporation and absorption in thin films

Evaporation of water: evaporation rate and collective effects

Wetting dynamics of colloidal dispersions on agar gel surfaces

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