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Monopolar surfaces.

C J van Oss1, M K Chaudhury, R J Good

  • 1Department of Microbiology, State University of New York, Buffalo 14214.

Advances in Colloid and Interface Science
|November 1, 1987
PubMed
Summary
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Many common materials exhibit monopolar surface properties, primarily electron donor characteristics. This monopolarity drives repulsion in polar liquids, influencing solubility, dispersibility, and stabilization effects in aqueous systems.

Area of Science:

  • Surface science
  • Colloid chemistry
  • Materials science

Background:

  • Traditional surface tension models often consider both electron donor and acceptor properties.
  • Many common materials exhibit predominantly one type of polar surface property.

Purpose of the Study:

  • To introduce a methodology for quantifying apolar and polar surface tension parameters.
  • To investigate the prevalence and implications of monopolar surfaces in common materials.
  • To re-examine colloid and surface phenomena through the lens of surface monopolarity.

Main Methods:

  • Development of a methodology to determine apolar, electron donor, and electron acceptor surface tension parameters.
  • Analysis of surface properties of common materials.

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Main Results:

  • Identified numerous common materials as monopolar, primarily exhibiting electron donor properties.
  • Demonstrated that monopolar materials strongly interact with bipolar materials like water.
  • Observed negative interfacial tension between monopolar surfaces and water, leading to repulsion and enhanced solubility/dispersibility.
  • Proposed monopolar repulsion as an explanation for "steric" stabilization and "hydration pressure" phenomena.
  • Linked negative interfacial tensions to microemulsion formation.

Conclusions:

  • Surface monopolarity is a significant factor in material interactions and colloid behavior.
  • Monopolar repulsion can dominate over other intermolecular forces, influencing solubility, dispersion, and phase behavior.
  • Reinterpretation of phenomena like steric stabilization and hydration pressure as consequences of surface monopolarity.