Macroscopic Model for Sessile Droplet Evaporation on a Flat Surface

Heijden, Thijs W. G. van der; Darhuber, Anton A.; Schoot, Paul van der

doi:10.1021/acs.langmuir.8b02374

Cited by 22 publications

(13 citation statements)

References 64 publications

(225 reference statements)

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“…In agreement with the water droplet size observed in the mineral oil drops (see section 2.2), the evaporation of the fL‐scale water droplets would not significantly occur during their formation. Indeed, by considering its speed (about 4 m s −1 ) and the distance between the nozzle and the oil drop surface (<1 mm), a typical fL‐scale water droplet forms at the nozzle in about 15–20 µs and needs not more than 0.2–0.3 ms to reach the oil drop, whereas by following the model of van der Heijden et al, the evaporation of 15–40 fL aqueous droplets is predicted in a range of 4–10 ms.…”

Section: Resultsmentioning

confidence: 99%

Printing Life‐Inspired Subcellular Scale Compartments with Autonomous Molecularly Crowded Confinement

et al. 2019

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A simple, rapid, and highly controlled platform to prepare life‐inspired subcellular scale compartments by inkjet printing has been developed. These compartments consist of fL‐scale aqueous droplets (few µm in diameter) incorporating biologically relevant molecular entities with programmed composition and concentration. These droplets are ink‐jetted in nL mineral oil drop arrays allowing for lab‐on‐chip studies by fluorescence microscopy and fluorescence life time imaging. Once formed, fL‐droplets are stable for several hours, thus giving the possibility of readily analyze molecular reactions and their kinetics and to verify molecular behavior and intermolecular interactions. Here, this platform is exploited to unravel the behavior of different molecular probes and biomolecular systems (DNA hairpins, enzymatic cascades, protein‐ligand couples) within the compartments. The fL‐scale size induces the formation of molecularly crowded confined shell structures (hundreds of nanometers in thickness) at the droplet surface, allowing discovery of specific features (e.g., heterogeneity, responsivity to molecular triggers) that are mediated by the intermolecular interactions in these peculiar environments. The presented results indicate the possibility of using this platform for designing nature‐inspired confined reactors allowing for a deepened understanding of molecular confinement effects in living subcellular compartments.

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Section: Resultsmentioning

confidence: 99%

Printing Life‐Inspired Subcellular Scale Compartments with Autonomous Molecularly Crowded Confinement

et al. 2019

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“…Both alternatives could induce a temporary pinning of the contact line, until the contact angle has dropped sufficiently, such that depinning occurs. 36 A detailed model for such a precipitation mechanism underlying the first pinning event is presented in Ref. [23].…”

Section: Discussionmentioning

confidence: 99%

Evaporation of water droplets on photoresist surfaces – An experimental study of contact line pinning and evaporation residues

Darhuber

2019

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…This then implies that the compound concentration C l = C l (t) within the liquid is independent of the position in the drop. This is a reasonable approximation, provided that the droplet shape relaxation time is much shorter than both the evaporation time and the diffusive timescale of the compound in the thin film 20 .…”

Section: Theorymentioning

confidence: 98%

“…In order to describe the droplet dynamics during evaporation, we may use a simple macroscopic model, such as presented in van der Heijden, Darhuber, and van der Schoot 20 . This model combines the relaxation of the droplet shape, diffusive evaporation and contact line pinning of the droplet, and describes the observed dynamics of evaporating droplets remarkably well.…”

Section: Theorymentioning

confidence: 99%

Compound redistribution due to droplet evaporation on a thin polymeric film: Theory

Heijden

Darhuber

Schoot

2019

Journal of Applied Physics

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A thin polymeric film in contact with a fluid body may leach low-molecular-weight compounds into the fluid. If this fluid is a small droplet, the compound concentration within the liquid increases due to ongoing leaching in combination with the evaporation of the droplet. This may eventually lead to an inversion of the transport process and a redistribution of the compounds within the thin film. In order to gain an understanding of the compound redistribution, we apply a macroscopic model for the evaporation of a droplet and combine that with a diffusion model for the compound transport. In the model, material deposition and the resulting contact line pinning are associated with the precipitation of a fraction of the dissolved material. We find three power law regimes for the size of the deposit area as a function of the initial droplet size, dictated by the competition between evaporation, diffusion and the initial compound concentrations in the droplet and the thin film. The strength of the contact line pinning determines the deposition profile of the precipitate, characterised by a pronounced edge and a linearly decaying profile towards the centre of the stain. Our predictions for the concentration profile within the solid substrate resemble patterns found experimentally.The following article will be submitted to Journal of Applied Physics. After it is published, it will be found at https://aip.scitation.org/journal/jap.

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Macroscopic Model for Sessile Droplet Evaporation on a Flat Surface

Cited by 22 publications

References 64 publications

Printing Life‐Inspired Subcellular Scale Compartments with Autonomous Molecularly Crowded Confinement

Printing Life‐Inspired Subcellular Scale Compartments with Autonomous Molecularly Crowded Confinement

Evaporation of water droplets on photoresist surfaces – An experimental study of contact line pinning and evaporation residues

Compound redistribution due to droplet evaporation on a thin polymeric film: Theory

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