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Surface roughness on hydrophobic polymer plates enhances liquid marble (LM) stabilization, allowing for a wider range of liquid surface tensions. This improved hydrophobicity enables the creation of novel cubic polymer particles.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Polymer Chemistry

Background:

  • Liquid marbles (LMs) are essential for various applications, but their stability is often limited by the properties of the stabilizing materials.
  • Surface properties, such as roughness and hydrophobicity, play a critical role in determining the stability and formation of LMs.
  • Understanding the interplay between surface characteristics and liquid properties is crucial for advancing LM technology.

Purpose of the Study:

  • To investigate the effect of surface roughness on hydrophobic polymer plates used to stabilize cubic liquid marbles.
  • To determine the relationship between surface roughness, liquid surface tension, and LM formation.
  • To explore the potential of rough polymer surfaces for synthesizing polymer particles via LMs.

Main Methods:

  • Utilized smooth and rough hydrophobic polymer plates as stabilizers for cubic LMs.
  • Studied the stabilization of LMs with liquids of varying surface tensions (72.8-26.6 mN m⁻¹ for smooth, 72.8-22.9 mN m⁻¹ for rough).
  • Employed electron microscopy and numerical analyses to confirm wetting states (Cassie-Baxter and metastable Cassie-Baxter).
  • Synthesized cubic polymer particles through free radical polymerization of LMs containing dodecyl acrylate.

Main Results:

  • Rough polymer plates stabilized LMs over a wider range of liquid surface tensions compared to smooth plates.
  • Increased surface roughness led to enhanced hydrophobicity and improved LM stabilization.
  • The formation of LMs was confirmed under Cassie-Baxter and metastable Cassie-Baxter wetting conditions.
  • Successful synthesis of cubic polymer particles was achieved using solvent-free free radical polymerization of cubic LMs.

Conclusions:

  • Surface roughness significantly enhances the hydrophobicity of polymer plates, improving their ability to stabilize liquid marbles.
  • Rough polymer surfaces enable the stabilization of LMs with liquids of lower surface tensions, expanding their applicability.
  • The study provides a pathway for the fabrication of unique polymer microstructures through the controlled polymerization of liquid marbles.