Functional supraparticles produced by the evaporation of binary colloidal suspensions on superhydrophobic surfaces

Hierarchically structured supraparticles can be produced by drying droplets of colloidal suspensions. Using binary suspensions provides degrees of structural and functional control beyond those possible for single components, while remaining tractable for fundamental mechanistic studies. Here, we im...

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Bibliographic Details
Published in:Soft matter 2024-09, Vol.2 (37), p.752-7511
Main Authors: Shneidman, Anna V, Zhang, Cathy T. Y, Mandsberg, Nikolaj K, Picece, Vittoria C. T. M, Shirman, Elijah, Paink, Gurminder K, Nicolas, Natalie J, Aizenberg, Joanna
Format: Article
Language:English
Subjects:
Cerium oxides
Colloids
Evaporation
Hydrophobicity
Methyl formate
Microparticles
Nanoparticles
Polymers
Polystyrene
Polystyrene resins
Silica
Structure-function relationships
Titanium dioxide
Zirconia
Zirconium dioxide
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Summary:Hierarchically structured supraparticles can be produced by drying droplets of colloidal suspensions. Using binary suspensions provides degrees of structural and functional control beyond those possible for single components, while remaining tractable for fundamental mechanistic studies. Here, we implement evaporative co-assembly of two distinct particle types - 'large' polystyrene microparticles and 'small' inorganic oxide nanoparticles (silica, titania, zirconia, or ceria) - dried on superhydrophobic surfaces to produce bowl-shaped supraparticles. We extend this method to raspberry colloid templating, in which the binary suspension consists of titania nanoparticles together with gold-decorated polystyrene colloids. Following removal of the polymer particles, we demonstrate catalytic oxidative coupling of methanol to methyl formate using the resulting mesoporous supraparticles, showcasing their practical application. The morphology and internal structuration of supraparticles formed from two distinct populations of colloial particles is studied as function of droplet composition and substrate geometry.
ISSN:1744-683X
1744-6848
1744-6848
DOI:10.1039/d4sm00458b