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Evaporation

Dried marks of whisky

Ernie Button is a photographer and he has been inspired by dried whisky drops in a glass. With a proper light, he made beautiful and inspiring pictures. However, he also noticed that these whisky drops leave marks after drying with a particular homogeneity contrary to coffee stains. The purpose of this study was to understand the mechanisms which generates these patterns. We highlighted that the drying process of whisky is a combination of several regimes. By mimicking whisky, we made chemical solutions reproducing similar patterns.

Trace d'une goutte de whisky séchée

 

This work has been relayed by popular media including TechTimes, Ryot, cnet, zeenews, Popular Mechanics, Diario Digital, New-York Times, thecreatorsproject, PijamaSurf, wn, Smithsonian as well as more specialized media such as european-coatings, Chemical and engineering news

Our work has been highlighted by Physical Review Letters where we published our paper and it has been commented in Nature Physics and ACS (#1 and #2).

Drying of a drop of tea: differences dry and wet surfaces

We have all experienced that a coffee drop drying on a table leaves a ring stain. The radial flow in the drop coupled with a larger drying flux at its edge are the reasons for the particle accumulation in the liquid wedge. However, if the substrate is wet, the liquid surrounding the drop modifies the vapor distribution, and thus the drop evaporation dynamics. Our experimental and theoretical investigations show that the ambient conditions affect the drying kinetics and the particle motion, but has a little effect on the final coffee stain.

Drop of tea on dry and wet surfaces

Publications about evaporation and drying problems:

6 results
2018
[6]F. Boulogne, B. Dollet, "Convective evaporation of vertical films", Soft Matter, vol. 14, 2018, pp. 1665-1671. [bibtex] [doi] [arxiv] [hal]
2017
[5]B. Dollet, F. Boulogne, "Natural convection above circular disks of evaporating liquids", Phys. Rev. Fluids, vol. 2, 2017, pp. 053501. [bibtex] [doi] [arxiv] [hal]
[4]F. Boulogne, F. Ingremeau and H. A. Stone, "Coffee-stain growth dynamics on dry and wet surfaces", Journal of Physics: Condensed Matter, vol. 29, no. 7, 2017, pp. 074001. [bibtex] [doi] [arxiv] [hal]
2016
[3]H. Kim, F. Boulogne, E. Um, I. Jacobi, E. Button, H. A. Stone, "Controlled uniform coating from the interplay of Marangoni flows and surface-adsorbed macromolecules", Physical Review Letters, vol. 116, 2016, pp. 124501. [bibtex] [doi] [arxiv] [hal]
2015
[2]Y. L. Kong, F. Boulogne, H. Kim, J. Nunes, J. Feng, H. A. Stone, "Deposition of quantum dots in a capillary tube", Langmuir, vol. 31, no. 45, 2015, pp. 12560-12566. [bibtex] [doi] [arxiv] [hal]
[1]F. Boulogne, A. Sauret, B. Soh, E. Dressaire, H. A. Stone, "Mechanical tuning of the evaporation rate of liquid on crossed fibers", Langmuir, vol. 31, no. 10, 2015, pp. 3094-3100. [bibtex] [doi] [arxiv] [hal]