Nanoparticle deposits near the contact line of pinned volatile droplets: size and shape revealed by atomic force microscopy

Alexandros Askounis, Daniel Orejon, Vasileios Koutsos, Khellil Sefiane, Martin E. R. Shanahan

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)

Abstract

We report on the structure of ring deposits formed following the free evaporation of a sessile droplet containing nanoparticles. The nanostructure of the evaporatively formed deposits was revealed using atomic force microscopy (AFM). The structures were found to form a peak about 5 microns wide and one micron high and to exhibit a gentle slope gradually increasing in height in the direction of the three phase contact line motion. A theory is proposed to explain the formation and shape of these deposits. A comparison between the theory and the experiments shows a very good qualitative and quantitative agreement.

Original languageEnglish
Pages (from-to)4152-4155
Number of pages4
JournalSoft Matter
Volume7
Issue number9
DOIs
Publication statusPublished - 2011
Externally publishedYes

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