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Aqueous Bubbles Stabilized with Millimeter-Sized Polymer Plates.

Yuri Sakurai1, Rina Kakiuchi1, Tomoyasu Hirai2,3

  • 1Division of Applied Chemistry, Environmental and Biomedical Engineering, Graduate School of Engineering, Osaka Institute of Technology, 5-16-1, Omiya, Asahi-ku, Osaka 535-8585, Japan.

Langmuir : the ACS Journal of Surfaces and Colloids
|February 28, 2023
PubMed
Summary
This summary is machine-generated.

Polymer plates stabilize aqueous bubbles, with stability enhanced by increased hydrophobicity, smaller plate size, and higher concentration. Bubble shape depends on the bubble-to-plate size ratio, leading to spherical, polyhedral, or layered structures.

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Area of Science:

  • Materials Science
  • Colloid and Surface Science
  • Soft Matter Physics

Background:

  • Stabilizing aqueous bubbles is crucial for various applications, including foaming, emulsification, and encapsulation.
  • Controlling bubble morphology and stability often relies on surface-active agents or colloidal particles.
  • Understanding the interplay between particle properties and bubble formation is key to designing advanced functional materials.

Purpose of the Study:

  • To investigate the influence of polymer plate properties (hydrophilicity-hydrophobicity, size, concentration) on aqueous bubble formation, stability, and structure.
  • To explore the relationship between the bubble-to-stabilizer size ratio and the resulting bubble morphology.
  • To elucidate the mechanisms governing the formation of different bubble structures based on particle wettability.

Main Methods:

  • Utilized monodisperse (sub)millimeter-sized hexagonal polymer plates as bubble stabilizers.
  • Investigated the effects of varying plate surface properties, size, and solid concentration on bubble characteristics.
  • Employed air-water mixing techniques to form bubbles and analyzed their stability, shape, and internal structure using microscopy and dimensional analysis.

Main Results:

  • Bubble formability and stability were enhanced by increasing plate hydrophobicity, decreasing plate size, and increasing solid concentration.
  • Three-dimensional bubbles (spherical, polyhedral) formed with suitable wettability plates, while 2D accordion-type structures formed with poorly wettable plates.
  • A correlation was established between bubble/stabilizer size ratio and bubble shape (spherical, polyhedral, triangular, sandwich) for suitably wettable plates.

Conclusions:

  • Polymer plate properties significantly dictate aqueous bubble characteristics, offering a tunable platform for bubble stabilization.
  • Bubble morphology can be precisely controlled by adjusting the bubble-to-stabilizer size ratio and particle wettability.
  • This study provides fundamental insights into colloidal stabilization of bubbles, with potential applications in materials design and process engineering.