Evaporation-driven liquid flow in sessile droplets

Gelderblom, Hanneke; Diddens, Christian; Marin, Alvaro

doi:10.1039/d2sm00931e

Cited by 71 publications

(53 citation statements)

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“…(2017) and summarised recently by Gelderblom et al. (2022). The drop is sitting on a flat surface with a contact angle and a constant contact radius .…”

mentioning

confidence: 88%

“…This so-called coffee stain effect, introduced by Deegan et al. (1997) and recently reviewed by Gelderblom, Diddens & Marin (2022) and Wilson & D'Ambrosio (2023), is the consequence of a radial flow induced by evaporation. To rationalise this phenomenon, the fluid flow in the drop must be determined to explain the dynamics of the particle motion.…”

Section: Introductionmentioning

confidence: 99%

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Coffee stain effect on a fibre from axisymmetric droplets

2023

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The so-called coffee stain effect has been intensively studied over the past decades, but most of the studies have focused on sessile droplets. In this paper, we analyse the origin of the difference between the deposition of suspended particles in a sessile drop and in an axisymmetric drop deposited on a fibre. First, we model the shape of a drop on a fibre and its evaporative flux with some approximations to derive analytical calculations. Then, for pinned contact lines, we solve the hydrodynamics equations in the liquid phase under the lubrication approximation to determine the flow velocity toward the contact lines. We comment on these results by comparison to a sessile drop of similar evaporating conditions, and we show that the substrate curvature plays a role on the contact line depinning, the local evaporative flux and the liquid flow field. The competition between the advection and the Brownian motion indicates that the transport of the particles toward the contact line occurs in a volume localised in the close vicinity of the contact lines for a drop on a fibre. Thus, the fibre geometry induces a weaker accumulation of particles at the contact line compared to a sessile drop, leading to the more homogeneous deposit observed experimentally.

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“…(2017) and summarised recently by Gelderblom et al. (2022). The drop is sitting on a flat surface with a contact angle and a constant contact radius .…”

mentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Coffee stain effect on a fibre from axisymmetric droplets

2023

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“…4 The pinned contact line of an evaporating sessile droplet induces a capillary flow, which causes liquid from the interior part of the droplet to replenish the escaped mass along the three-phase contact line, 5,6 and the higher evaporation rate near the contact line can also enhance this compensatory flow. 7,8 The evaporation-induced flow inside colloidal droplets can deposit CNTs and align them along the contact line. 9 The colloidal methods for CNT printing can be categorized based on the dispersion scale into two groups of micro/ nanometer 10,11 and large scale deposition.…”

Section: Introductionmentioning

confidence: 99%

Geometrically-controlled evaporation-driven deposition of conductive carbon nanotube patterns on inclined surfaces

et al. 2023

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“…Our motivation is to identify those phenomena that could be found in any other active phoretic colloidal entity, biological or synthetic, within a sessile droplet. Evaporating droplets can typically manifest in a wide range of evaporation-driven flows [14][15][16], with an intensity being inversely proportional to the relative humidity of the atmosphere surrounding the droplet. Apart from the motion generated in liquid phase by the evaporation, active Janus catalytic particles are self-propelled.…”

Section: Introductionmentioning

confidence: 99%

“…IV. Additional control experiments are performed with passive colloids, which are typically used as flow tracers to infer the convective flow [16,20,21]. The experimental results are contrasted with active Brownian particle simulations and finite element simulations for the fluid flow.…”

Section: Introductionmentioning

confidence: 99%

Interfacial aggregation of self-propelled Janus colloids in sessile droplets

Jalaal

Hagen²,

le³

et al. 2022

Phys. Rev. Fluids

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Living microorg anisms in confined systems typically experience an affinity to populate boundaries. The reason for such affinity to interfaces can be a combination of their directed motion and hydrodynamic interactions at distances larger than their own size. Here we will show that self-propelled Janus particles (polystyrene particles partially coated with platinum) immersed in droplets of water and hydrogen peroxide tend to accumulate in the vicinity of the liquid/gas interface. Interestingly, the interfacial accumulation occurs despite the presence of an evaporation-driven flow caused by a solutal Marangoni flow, which typically tends to redistribute the particles within the droplet's bulk. By performing additional experiments with passive colloids (flow tracers) and comparing with numerical simulations for both particle active motion and the fluid flow, we disentangle the dominating mechanisms behind the observed interfacial particle accumulation. These results allow us to make an analogy between active Janus particles and some biological microswimmers concerning how they interact with their environment.

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Evaporation-driven liquid flow in sessile droplets

Abstract: The evaporation of a sessile droplet spontaneously induces an internal capillary liquid flow. The surface-tension driven minimisation of surface area and/or surface-tension differences at the liquid-gas interface caused by evaporation-induced...

Cited by 71 publications

References 154 publications

Coffee stain effect on a fibre from axisymmetric droplets

Coffee stain effect on a fibre from axisymmetric droplets

Geometrically-controlled evaporation-driven deposition of conductive carbon nanotube patterns on inclined surfaces

Interfacial aggregation of self-propelled Janus colloids in sessile droplets

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