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Fluid dynamics of evolving foams.

Raquel Verdejo1, Francisco J Tapiador, Lukas Helfen

  • 1Institute of Polymer Science and Technology, (CSIC), Juan de la Cierva, 3, 28006 Madrid, Spain. rverdejo@ictp.csic.es

Physical Chemistry Chemical Physics : PCCP
|November 20, 2009
PubMed
Summary
This summary is machine-generated.

This study introduces a new method to analyze coarsening phenomena in multiphase systems like foams. Nanofillers alter the speed and type of coarsening, offering insights into material stability.

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Area of Science:

  • Materials Science
  • Physics
  • Chemical Engineering

Background:

  • Coarsening phenomena govern the physical properties of multiphase systems.
  • Examples include raindrops, polycrystal grains, and foams, which evolve towards lower-energy states via coalescence, Ostwald ripening, and drainage.

Purpose of the Study:

  • To propose a novel procedure for identifying and characterizing key topological transformations in coarsening phenomena.
  • To utilize a physically-based fluid dynamic framework for this analysis.

Main Methods:

  • In situ, real-time observation of polymer foaming processes reinforced with carbon nanotubes and graphene sheets.
  • Synchrotron X-ray radioscopy was employed to capture foaming dynamics.
  • Analysis of growth patterns and coarsening events in filled and unfilled samples.

Main Results:

  • Filled polymer foams exhibited distinct trends and speeds in coarsening compared to unfilled samples.
  • The wetting nature of carbon nanoparticles influenced the dominant coarsening phenomena.
  • Detailed information on the evolution of growth patterns and coarsening events was obtained.

Conclusions:

  • The developed procedure effectively characterizes topological transformations in coarsening phenomena.
  • Nanofillers significantly impact the dynamics and mechanisms of coarsening in polymer foams.
  • The methodology is adaptable to various 2D/3D imaging data and other multiphase systems.