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Dendritic surface patterns from Bénard‐Marangoni instabilities upon evaporation of a reactive ZnO nanofluid droplet: A fractal dimension analysis

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)493-498
Number of pages6
JournalJournal of Colloid and Interface Science
Volume536
Early online date25 Oct 2018
DOIs
DateAccepted/In press - 24 Oct 2018
DateE-pub ahead of print - 25 Oct 2018
DatePublished (current) - 15 Feb 2019

Abstract

We present a box counting fractal dimension (FD) analysis of the dendritic patterns obtained under conditions far from equilibrium via rapid evaporation of a sessile drop containing reactive ZnO nanoparticles. These dendrites were manifestations of solidified Bénard-Marangoni (BM) instability convection cells, and we previously noted that their complex hierarchical morphologies were superficially analogous to the foliage of red algae, Spanish dagger, or spider plant. The fractal dimension of the Bénard-Marangoni dendrites was found to vary in the range of 1.77–1.89 and also depend on the size of the Bénard-Marangoni cells. These fractal dimension results were correlated with the morphological details of the Bénard-Marangoni cells and ZnO particle characteristics, providing a quantitative description of such complex surface patterns emerging from the dynamic process of the Bénard-Marangoni instability.

    Research areas

  • Evaporation induced self-assembly, Zinc oxide, Evaporative drying, Reactive nanofluids, Bénard-Marangoni instabilities, Coffee ring effect, Fractal dimension analysis

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    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/S0021979718312773 . Please refer to any applicable terms of use of the publisher.

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    Embargo ends: 25/10/19

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    Licence: CC BY-NC-ND

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