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  Porous supraparticle assembly through self-lubricating evaporating colloidal ouzo drops

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.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0002-ECC7-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0002-ECC8-3
Genre: Journal Article

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Tan, H., Author
Wooh, S., Author
Butt, H. J., Author
Zhang, X., Author
Lohse, Detlef1, Author              
Affiliations:
1Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063285              

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 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.

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Language(s): eng - English
 Dates: 2019-01-29
 Publication Status: Published online
 Pages: -
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 Rev. Method: Peer
 Identifiers: DOI: 10.1038/s41467-019-08385-w
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Title: Nature Communications
Source Genre: Journal
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Pages: 8 Volume / Issue: 10 (1) Sequence Number: 478 Start / End Page: - Identifier: -