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Issue 21, 2011
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Interaction of bi-dispersed particles with contact line in an evaporating colloidal drop

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Abstract

The deposition behavior of an inkjet-printed aqueous colloidal mixture of micro- and nanoparticles onto a glass substrate with systematically varied wettability has been investigated using fluorescence microscopy. Real-time bottom-view images show that particles inside an evaporating drop rearrange themselves near the drop contact line according to their sizes, where smaller particles tend to deposit closer to the contact line compared to the larger ones. By increasing substrate wettability, particles in the bi-dispersed mixture can be further separated compared to those on substrates of poor wettability. This is primarily because, during different stages of evaporation, the interplay of surface tension, drag due to evaporative flow, and particle–substrate interactions rearrange particles inside a colloidal drop near the contact line region. Forces acting on particles determine the extent to which particles enhance contact line pinning, which ultimately determines the final deposition morphology of particles from a bi-dispersed colloidal mixture.

Graphical abstract: Interaction of bi-dispersed particles with contact line in an evaporating colloidal drop

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Publication details

The article was received on 21 Jul 2011, accepted on 23 Aug 2011 and first published on 16 Sep 2011


Article type: Paper
DOI: 10.1039/C1SM06393F
Citation: Soft Matter, 2011,7, 10135-10143

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    Interaction of bi-dispersed particles with contact line in an evaporating colloidal drop

    V. H. Chhasatia and Y. Sun, Soft Matter, 2011, 7, 10135
    DOI: 10.1039/C1SM06393F

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