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Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...
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pH-controlled microbubble shell formation and stabilization.

Artem Kovalenko1, Prasad Polavarapu, Geneviève Pourroy

  • 1Institut Charles Sadron (ICS, UPR CNRS 22), University of Strasbourg , 23 rue du Loess, 67034 Strasbourg, France.

Langmuir : the ACS Journal of Surfaces and Colloids
|May 14, 2014
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Summary
This summary is machine-generated.

This study demonstrates how pH controls the stability of microbubbles stabilized by perfluorooctyl(ethyl)phosphate (F8H2Phos) surfactant. Optimal stabilization occurs when both monosodic and disodic F8H2Phos salts are present, forming a highly elastic shell during deflation.

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Area of Science:

  • Colloid and Surface Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Microbubbles are crucial in various applications, requiring stable shell structures for efficacy.
  • The self-assembly and properties of surfactant shells significantly influence microbubble stability.
  • Understanding the role of pH in surfactant behavior is key to controlling microbubble formation.

Purpose of the Study:

  • To investigate the pH-dependent self-assembly and stabilization mechanisms of microbubbles using perfluorooctyl(ethyl)phosphate (F8H2Phos).
  • To characterize the interfacial properties and shell morphology of F8H2Phos microbubbles across a range of pH values.
  • To elucidate the synergistic role of monosodic and disodic F8H2Phos salts in microbubble stabilization.

Main Methods:

  • Microbubble formation and stabilization in aqueous F8H2Phos solutions at varying pH (5.6-9.7).
  • In-situ microscopic observation of shell morphology during cooling and deflation.
  • Measurement of adsorption kinetics, Gibbs film elasticity, and interfacial tension at the air/water interface.
  • Langmuir monolayer compression studies to assess film stability.

Main Results:

  • Effective microbubble stabilization observed between pH 5.6 and 8.5, correlating with the presence of both monosodic and disodic F8H2Phos salts.
  • At low pH, F8H2Phos forms highly elastic interfacial films (up to 500 mN m(-1)) via a phase transition, enhancing shell stability.
  • At high pH, rapid adsorption occurs but results in low film elasticity (∼5 mN m(-1)), leading to less stable microbubbles.
  • The disodic salt rapidly stabilizes the interface, while the monosodic salt provides long-term stability through a transition to a highly elastic phase during deflation.

Conclusions:

  • Microbubble stability is critically dependent on pH, influencing the adsorption, phase behavior, and elasticity of the F8H2Phos surfactant shell.
  • A combination of monosodic and disodic F8H2Phos salts is essential for robust microbubble stabilization, with distinct roles in initial formation and sustained integrity.
  • The transition to a highly elastic shell during deflation is a key mechanism contributing to the overall stability of these microbubbles.