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<p>Surface-templated evaporation-driven (S-TED) synthesis, a technique for producing supraparticles by drying colloidal dispersion droplets on liquid-repellent surfaces, offers numerous advantages over conventional solvent-based synthesis methods. For example, the S-TED method requires no toxic solvent, heating, or additional purification steps. Moreover, this approach allows precise control of supraparticle porosity and size with a narrow size distribution. However, despite extensive efforts, only a limited range of supraparticles shapes with different curvatures have been fabricated. This work introduces a novel approach for three-dimensional manipulation of supraparticle shapes using multiple liquid-repellent surfaces as drying templates. Thin polyethylene terephthalate (PET) plates with varied wettable surfaces and shapes are used as templates. Droplets covered by the PET plates evaporate in two different modes, involving constant contact line or constant height. These modes considerably influence the shape of supraparticles. In the constant contact line mode, the shape of the PET plates determines the supraparticle shape. In addition, polyhedral shapes can be precisely fabricated by varying the numbers of the PET plates, broadening the range of achievable supraparticle shapes.</p>

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Evaporation-Driven Three-Dimensional Supraparticle Synthesis Using Multiple Liquid-Repellent Surface Templates

  • 期刊论文

  • 发表日期：

    2025年1月12日

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  • Hyeonjin Kim,
  • Syuji Fujii,
  • Sanghyuk Wooh

摘要

Surface-templated evaporation-driven (S-TED) synthesis, a technique for producing supraparticles by drying colloidal dispersion droplets on liquid-repellent surfaces, offers numerous advantages over conventional solvent-based synthesis methods. For example, the S-TED method requires no toxic solvent, heating, or additional purification steps. Moreover, this approach allows precise control of supraparticle porosity and size with a narrow size distribution. However, despite extensive efforts, only a limited range of supraparticles shapes with different curvatures have been fabricated. This work introduces a novel approach for three-dimensional manipulation of supraparticle shapes using multiple liquid-repellent surfaces as drying templates. Thin polyethylene terephthalate (PET) plates with varied wettable surfaces and shapes are used as templates. Droplets covered by the PET plates evaporate in two different modes, involving constant contact line or constant height. These modes considerably influence the shape of supraparticles. In the constant contact line mode, the shape of the PET plates determines the supraparticle shape. In addition, polyhedral shapes can be precisely fabricated by varying the numbers of the PET plates, broadening the range of achievable supraparticle shapes.