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.
- Evaporation induced self-assembly
- Zinc oxide
- Evaporative drying
- Reactive nanofluids
- Bénard-Marangoni instabilities
- Coffee ring effect
- Fractal dimension analysis
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Unusual “coffee rings”: Hierarchical surface patterns from evaporation of a reactive ZnO nanofluid sessile dropAuthor: Wasik, P., 24 Jul 2019
Student thesis: Doctoral Thesis › Doctor of Philosophy (PhD)File