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Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy
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Published on: July 18, 2014

Short-range forces between glass surfaces in aqueous solutions.

Sergio M Acuña1, Pedro G Toledo

  • 1Chemical Engineering Department and Surface Analysis Laboratory (ASIF), University of Concepción, P.O. Box 160-C, Correo 3, Concepción, Chile. sacuna@ubiobio.cl

Langmuir : the ACS Journal of Surfaces and Colloids
|March 29, 2008
PubMed
Summary

The force between glass surfaces at short distances (under 1 nm) is universal, unaffected by solution conditions like electrolytes or pH. This suggests a surface-induced solvent effect, not steric hindrance, drives the interaction.

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Area of Science:

  • Colloid and Surface Science
  • Physical Chemistry
  • Materials Science

Background:

  • Understanding intersurface forces is crucial in colloid and surface science.
  • The Derjaguin-Landau-Verwey-Overbeek (DLVO) theory is a fundamental model for describing interactions between charged surfaces in electrolyte solutions.
  • Previous studies have explored various factors influencing forces between surfaces, but short-range universal behavior and its origins remain areas of active research.

Purpose of the Study:

  • To investigate the universal character of forces between glass surfaces at short ranges.
  • To determine the influence of electrolyte properties (ion size, charge, concentration) and pH on these forces.
  • To elucidate the underlying mechanism responsible for the observed excess force beyond DLVO theory.

Main Methods:

  • Utilizing Atomic Force Microscopy (AFM) to measure forces between glass surfaces.
  • Applying a charge regulation model in conjunction with DLVO theory to analyze AFM data.
  • Systematically varying electrolyte type (Na, Ca, Al), concentration (10^-6 to 10^-2 M), and pH (3.1 to 7.9).

Main Results:

  • Observed universal force behavior at short ranges (< 1 nm), independent of solution conditions.
  • Found that the excess force (AFM force minus DLVO force) remained constant across tested electrolyte variations and pH.
  • Detected oscillatory force curves with a period of ~0.25 nm, corresponding to water molecule diameter.

Conclusions:

  • The short-range force between glass surfaces exhibits universal characteristics.
  • The excess force is attributed to a surface-induced solvent effect, specifically the formation of a hydrogen-bonding network.
  • This mechanism is distinct from solvent-induced surface steric hindrance.