Abstract
In recent years, evaporative self-assembly of sessile droplets has gained considerable attention owing to its wide applicability in many areas. While the phenomenon is well studied for smooth and isotropically rough (self-affine) surfaces, investigations comparing the outcomes on self-affine vis-à-vis corrugated surfaces remains to be done. In this experimental work, we compare the wetting and evaporation dynamics of nano-colloidal microlitre droplets on self-affine and corrugated nanorough surfaces having identical roughnesses and interface properties. The coupled influence of particle size, concentration, and surface structuring has been explored. Differences in wettability and evaporation dynamics are observed, which are explained via the interaction between wetting fluid and anisotropic surface roughness. Our findings exhibit different temporal behaviour of contact radius and angle in the evaporation process of the droplets. Further, the corrugated surface exhibits anisotropic wettability with a monotonic change in droplet shape as evaporation proceeds, finally giving rise to irregular dried patterns. The scaled rim width and crack spacing of the particulate deposits are examined. Our results can inspire fabrication of surfaces that can facilitate direction-dependent droplet motion for specific applications.
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The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
The authors thank DST-SERB India (Grant No. CRG/2018/001258) for partial financial support related to this work. We also thank the Central Research Facility, IIT Ropar for AFM, FESEM and XPS measurements. Deeksha Rani also would like to thank the University Grants Commission (UGC), Government of India, for financial support through a research fellowship.
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Rani, D., Sarkar, S. Drying behaviour of nanofluid sessile droplets on self-affine vis-à-vis corrugated nanorough surfaces. Eur. Phys. J. E 46, 113 (2023). https://doi.org/10.1140/epje/s10189-023-00374-8
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DOI: https://doi.org/10.1140/epje/s10189-023-00374-8