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Hierarchical microfibrillar gels from evaporation-induced anisotropic self-assembly of in situ-generated nanocrystals

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)78-84
Number of pages7
JournalJournal of Colloid and Interface Science
Volume558
Early online date28 Sep 2019
DOIs
DateAccepted/In press - 27 Sep 2019
DateE-pub ahead of print - 28 Sep 2019
DatePublished (current) - 15 Dec 2019

Abstract

Whilst nanocrystal gels may be formed via destabilization of pre-functionalized nanocrystal dispersions, gelation via assembly of unfunctionalized nanocrystals into fibrillar networks remains a significant challenge. Here, we show that gels with hierarchical microfibrillar networks are formed from anisotropic self-assembly of in situ-generated mesolamellar nanocrystals upon evaporation of ZnO nanofluids. The obtained gels display the thermo-reversible behavior characteristic of a non-covalent physical gel. We elucidate a three-stage gelation mechanism. In the pre-nucleation stage, the cloudy ZnO nanofluid transforms into a transparent stable suspension, comprising multi-branched networks of aggregates self-assembled from in situ-generated layered zinc hydroxide (LZH) nanocrystals upon solvent evaporation. In the subsequent nucleation and anisotropic 1D fibre growth stage, further evaporation triggers nucleation and growth of 1D nanofibers through reorganization of the nanocrystal aggregates, before rapid nanofibre bundling leading to microfibrillar networks in the ultimate gelation stage. Our results provide mechanistic insights for hierarchical self-assembly of nanocrystals into fibrillar gels and open up facile fabrication routes using reactive transition metal-oxide nanofluids for new functional fibres and gels.

    Structured keywords

  • Bristol BioDesign Institute

    Research areas

  • 3D-fibre networks, Anisotropic self-assembly, Dynamic self-assembly, Evaporation induced self-assembly, Nanocrystal gels, Reactive nanofluids, synthetic biology

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  • Full-text PDF (author’s accepted manuscript)

    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Elsevier at https://www.sciencedirect.com/science/article/pii/S0021979719311531 . Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 2.92 MB, PDF document

    Embargo ends: 28/09/21

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    Licence: CC BY-NC-ND

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