• DEVIKA VENKUZHY SUDHAKARAN

      Articles written in Bulletin of Materials Science

    • Evaporation-driven self-assembly in the mixtures of micro and nanoparticles

      RAVI KUMAR PUJALA DEVIKA VENKUZHY SUDHAKARAN SURAJIT DHARA

      More Details Abstract Fulltext PDF

      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 positionalorder 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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