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Issue 17, 2012
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Pattern formation by dewetting and evaporating sedimenting suspensions

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Pattern formation from drying droplets containing sedimenting particles and dewetting of thin films of such suspensions was studied. The dewetting causes the formation of finger-like patterns near the contact line which leave behind a deposit of branches. We find that the strikingly low speed of dewetting is due to the high particle concentration in the contact line region, leading to a strongly enhanced viscosity. For pattern formation from drying droplets (containing particles), evaporation also causes dewetting. In both cases, we find a similar relationship between the size of the patterns and the dewetting speed. The coefficient of this relationship gives us the effective viscosity at the contact line. We present a simple model that accounts for this, and that shows that the size of the particles is the relevant length scale in both problems.

Graphical abstract: Pattern formation by dewetting and evaporating sedimenting suspensions

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Publication details

The article was received on 17 Nov 2011, accepted on 16 Feb 2012 and first published on 09 Mar 2012

Article type: Paper
DOI: 10.1039/C2SM07201G
Citation: Soft Matter, 2012,8, 4682-4686
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    Pattern formation by dewetting and evaporating sedimenting suspensions

    M. Habibi, P. Moller, A. Fall, S. Rafai and D. Bonn, Soft Matter, 2012, 8, 4682
    DOI: 10.1039/C2SM07201G

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