Porous supraparticle assembly through self-lubricating evaporating colloidal 
ouzo drops

Tan, H.; Wooh, S.; Butt, H. J.; Zhang, X.; Lohse, Detlef

doi:10.1038/s41467-019-08385-w

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Porous supraparticle assembly through self-lubricating evaporating colloidal ouzo drops

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Lohse, Detlef
Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Citation

Tan, H., Wooh, S., Butt, H. J., Zhang, X., & Lohse, D. (2019). Porous supraparticle assembly through self-lubricating evaporating colloidal ouzo drops. Nature Communications, 10(1): 478. doi:10.1038/s41467-019-08385-w.

Cite as: https://hdl.handle.net/21.11116/0000-0002-ECC7-4

Abstract

The assembly of colloidal particles from evaporating suspension drops is seen as a versatile route for the fabrication of supraparticles for various applications. However, drop contact line pining leads to uncontrolled shapes of the emerging supraparticles, hindering this technique. Here we report how the pinning problem can be overcome by self-lubrication. The colloidal particles are dispersed in ternary drops (water, ethanol, and anise-oil). As the ethanol evaporates, oil microdroplets form ('ouzo effect'). The oil microdroplets coalesce and form an oil ring at the contact line, levitating the evaporating colloidal drop ('self-lubrication'). Then the water evaporates, leaving behind a porous supraparticle, which easily detaches from the surface. The dispersed oil microdroplets act as templates, leading to multi-scale, fractal-like structures inside the supraparticle. Employing this method, we could produce a large number of supraparticles with tunable shapes and high porosity on hydrophobic surfaces.