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      https://www.ias.ac.in/article/fulltext/boms/043/0173

    • Keywords

       

      Self-assembly; micro and nanoparticles; depletion zone; evaporation; core–shell particles.

    • 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 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.

    • Author Affiliations

       

      RAVI KUMAR PUJALA1 DEVIKA VENKUZHY SUDHAKARAN2 SURAJIT DHARA2

      1. Soft and Active Matter Group, Department of Physics, Indian Institute of Science Education and Research (IISER), Tirupati, Andhra Pradesh 517507, India
      2. School of Physics, University of Hyderabad, Hyderabad 500046, India
    • Dates

       
  • Bulletin of Materials Science | News

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