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Related Concept Videos

Surface Active Agents01:27

Surface Active Agents

Surfactants, named for their behavior at interfaces, positively adsorb at the interfaces of two phases, reducing interfacial tension. Their versatility as emulsifiers, detergents, and foaming agents stems from this ability. Surfactants, often termed amphiphiles, share the property of amphipathy, with molecules having both hydrophilic and hydrophobic portions. The hydrophilic part is called the head, and the hydrophobic part, including an elongated alkyl substituent, forms the tail.Surfactants...
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Related Experiment Video

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Synthesis of Biocompatible Liquid Crystal Elastomer Foams as Cell Scaffolds for 3D Spatial Cell Cultures
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Published on: April 11, 2017

pH-responsive aqueous foams stabilized by ionizable latex particles.

Bernard P Binks1, Ryo Murakami, Steven P Armes

  • 1Surfactant & Colloid Group, Department of Chemistry, University of Hull, Hull HU6 7RX, UK. b.p.binks@ hull.ac.uk

Langmuir : the ACS Journal of Surfaces and Colloids
|July 31, 2007
PubMed
Summary

Colloidal particles with pH-sensitive surfaces stabilize foams by adsorbing at air-water interfaces. Foam formation and stability depend on particle charge, occurring below the isoelectric point but not at high anionic pH.

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Area of Science:

  • Colloid and Surface Science
  • Materials Science
  • Physical Chemistry

Background:

  • Colloidal particles are utilized in various applications due to their surface properties.
  • Foam stabilization is crucial in many industrial processes.
  • Understanding particle-surface interactions at interfaces is key for controlling material behavior.

Purpose of the Study:

  • To design and characterize pH-sensitive colloidal particles for foam stabilization.
  • To investigate the influence of pH on the foamability and stability of aqueous dispersions.
  • To elucidate the relationship between particle surface charge and foam properties.

Main Methods:

  • Synthesis of polystyrene latex particles stabilized by poly(acrylic acid).
  • Adsorption of particles at the air-water interface.
  • Evaluation of foam formation and stability across a range of pH values.
  • Determination of particle charge characteristics as a function of pH.

Main Results:

  • Particles adsorbed at the air-water surface, acting as foam stabilizers.
  • Foam formation and stability were observed only at pH values below the isoelectric point.
  • At high pH, where particles are anionic, no foam was formed.
  • Particle charge (uncharged, positive, or negative) dictates foamability and stability.

Conclusions:

  • pH-sensitive colloidal particles can effectively stabilize aqueous foams.
  • Foamability and stability are directly linked to the pH-dependent surface charge of the particles.
  • These findings are applicable to both general pH-dependent and specific pH-responsive systems.