Skip to Main content Skip to Navigation
Journal articles

Evaporation of a sessile droplet: Inside the coffee stain

Abstract : We have investigated experimentally, for the first time at microscopic level, the growth of the deposit left around a drop of colloids drying on a solid surface ("coffee stain effect"). Direct observations show that there are several distinct phases of growth, the later ones exhibiting surprising pattern formations with spatial modulation of the deposit. In addition, fluorescence reveals that the initial growth phase is governed by a single length scale, increasing with time as t 2 3. We show that this exponent is a direct consequence of the divergence of evaporation near contact line evidenced by Deegan et al. We propose a simple ballistic model that allows us to calculate both this exponent and the prefactor, in agreement with yet available more complex descriptions. This model also opens the possibility to include effects neglected up to now.
Complete list of metadatas

Cited literature [33 references]  Display  Hide  Download

https://hal.sorbonne-universite.fr/hal-01576678
Contributor : Bruno Publis_simm <>
Submitted on : Sunday, November 17, 2019 - 5:08:53 PM
Last modification on : Saturday, September 26, 2020 - 11:44:11 PM
Long-term archiving on: : Tuesday, February 18, 2020 - 2:30:03 PM

File

CoffeeStainBertelootAuthors.pd...
Files produced by the author(s)

Identifiers

Citation

Guillaume Berteloot, Anna Hoang, Adrian Daerr, H. Pirouz Kavehpour, Francois Lequeux, et al.. Evaporation of a sessile droplet: Inside the coffee stain. Journal of Colloid and Interface Science, Elsevier, 2012, 370 (1), pp.155 - 161. ⟨10.1016/j.jcis.2011.10.053⟩. ⟨hal-01576678⟩

Share

Metrics

Record views

411

Files downloads

762