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Superamphiphobic coatings based on liquid-core microcapsules with engineered capsule walls and functionality.
KTH, Royal Institute of Technology, Sweden ; WWSC Wallenberg Wood Science Center, Sweden.
KTH, Royal Institute of Technology, Sweden ; WWSC Wallenberg Wood Science Center, Sweden.
RISE - Research Institutes of Sweden, Bioscience and Materials, Surface, Process and Formulation.ORCID iD: 0000-0002-4746-6559
KTH, Royal Institute of Technology, Sweden ; WWSC Wallenberg Wood Science Center, Sweden.
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2018 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 8, no 1, article id 3647Article in journal (Refereed) Published
Abstract [en]

Microcapsules with specific functional properties, related to the capsule wall and core, are highly desired in a number of applications. In this study, hybrid cellulose microcapsules (1.2 ± 0.4 µm in diameter) were prepared by nanoengineering the outer walls of precursor capsules. Depending on the preparation route, capsules with different surface roughness (raspberry or broccoli-like), and thereby different wetting properties, could be obtained. The tunable surface roughness was achieved as a result of the chemical and structural properties of the outer wall of a precursor capsule, which combined with a new processing route allowed in-situ formation of silica nanoparticles (30-40 nm or 70 nm in diameter). By coating glass slides with "broccoli-like" microcapsules (30-40 nm silica nanoparticles), static contact angles above 150° and roll-off angles below 6° were obtained for both water and low surface-tension oil (hexadecane), rendering the substrate superamphiphobic. As a comparison, coatings from raspberry-like capsules were only strongly oleophobic and hydrophobic. The liquid-core of the capsules opens great opportunities to incorporate different functionalities and here hydrophobic superparamagnetic nanoparticles (SPIONs) were encapsulated. As a result, magnetic broccoli-like microcapsules formed an excellent superamphiphobic coating-layer on a curved geometry by simply applying an external magnetic field.

Place, publisher, year, edition, pages
2018. Vol. 8, no 1, article id 3647
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Natural Sciences
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URN: urn:nbn:se:ri:diva-33335DOI: 10.1038/s41598-018-21957-yPubMedID: 29483613OAI: oai:DiVA.org:ri-33335DiVA, id: diva2:1186575
Available from: 2018-02-28 Created: 2018-02-28 Last updated: 2018-08-16Bibliographically approved

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Publisher's full textPubMedhttps://www.nature.com/articles/s41598-018-21957-y

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Järn, Mikael

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