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<p>The wettability and evaporation dynamics of polymeric surfaces are pivotal for optimizing their performance in applications such as coatings, microfluidics, and biomedical devices. This study examines the drying behavior of water and colloidal droplets on polystyrene (PS), polymethyl methacrylate (PMMA), and polydimethylsiloxane (PDMS) substrates, benchmarked against glass, to elucidate the effects of surface roughness and wettability. Employing a phenomenological concept, the time-dependent Ginzburg–Landau (TDGL) equation with a ratchet potential, we model the interplay between surface topography and fluid dynamics, capturing evaporation patterns and particle deposition. Surface modifications reveal that molecular level of roughness and hydrophobicity significantly influence droplet spreading and drying rates, with PS bead colloidal drying highlighting substrate-specific deposition morphologies. These insights enable the tailoring of polymeric surfaces for enhanced functionality, offering potential advancements in surface engineering and interfacial science.</p>

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Tailoring the wettability and evaporation dynamics of polymeric surfaces via surface modifications

  • 期刊论文

  • 发表日期：

    2025年8月16日

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  • Ashish Kumar,
  • Arnab Saha,
  • Abhishek Kumar,
  • Pushpak Mandi,
  • Moutushi Dutta Choudhury

摘要

The wettability and evaporation dynamics of polymeric surfaces are pivotal for optimizing their performance in applications such as coatings, microfluidics, and biomedical devices. This study examines the drying behavior of water and colloidal droplets on polystyrene (PS), polymethyl methacrylate (PMMA), and polydimethylsiloxane (PDMS) substrates, benchmarked against glass, to elucidate the effects of surface roughness and wettability. Employing a phenomenological concept, the time-dependent Ginzburg–Landau (TDGL) equation with a ratchet potential, we model the interplay between surface topography and fluid dynamics, capturing evaporation patterns and particle deposition. Surface modifications reveal that molecular level of roughness and hydrophobicity significantly influence droplet spreading and drying rates, with PS bead colloidal drying highlighting substrate-specific deposition morphologies. These insights enable the tailoring of polymeric surfaces for enhanced functionality, offering potential advancements in surface engineering and interfacial science.