Abstract
We report experimental studies on the self-assembly of silica microspheres and Laponite nanoplatelets (NPs) in evaporating sessile droplets and in thin films, respectively. A ring-like stain of the silica microspheres with positional order is observed after the evaporation of sessile droplets due to the coffee-ring effect. This effect is suppressed in the binary mixtures of silica microspheres and Laponite NPs. A depletion zone has been observed in the mixtures during the sessile droplet evaporation, the width of which can be tuned by varying the compositions. We demonstrate a simple method for preparing core–shell particles by evaporating thin films of binary mixtures in which the Laponite NPs self-assemble to form a crystalline shell on the amorphous silica microspheres. We present a possible orientation of the Laponite NPs in the shell.
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Acknowledgements
RKP acknowledges the support from the Department of Science and Technology, India for an INSPIRE Faculty Award Grant (DST/INSPIRE/04/2016/002370). SD gratefully acknowledges the support from the DST (DST/SJF/PSA-02/2014-2015) and SERB. DVS acknowledges DST for INSPIRE fellowship.
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Pujala, R.K., Venkuzhy Sudhakaran, D. & Dhara, S. Evaporation-driven self-assembly in the mixtures of micro and nanoparticles. Bull Mater Sci 43, 173 (2020). https://doi.org/10.1007/s12034-020-02096-5
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DOI: https://doi.org/10.1007/s12034-020-02096-5