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Surface interactions during polyelectrolyte multilayer buildup. 1. Interactions and layer structure in dilute

Eva Blomberg1, Evgeni Poptoshev, Per M Claesson

  • 1Department of Chemistry, Surface Chemistry, Royal Institute of Technology, Drottning Kristinas väg 51, SE 100 44 Stockholm, Sweden. eva.blomberg@surfchem.kth.se

Langmuir : the ACS Journal of Surfaces and Colloids
|July 1, 2005
PubMed
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Surface forces between polyelectrolyte multilayers, poly(allylamine hydrochloride) (PAH) and poly(styrenesulfonate sodium salt) (PSS), were investigated. Electrostatic repulsion dominated identical surfaces, while dissimilar surfaces showed bridging attraction.

Area of Science:

  • Surface Science
  • Materials Science
  • Physical Chemistry

Background:

  • Polyelectrolyte multilayers (PEMs) are widely used in various applications.
  • Understanding surface forces is crucial for controlling PEM assembly and properties.

Purpose of the Study:

  • Investigate surface forces between PAH/PSS polyelectrolyte multilayers.
  • Characterize interactions during film buildup using a surface force apparatus.

Main Methods:

  • Assembled PAH/PSS multilayers on mica surfaces ex situ.
  • Measured surface interactions in 10(-4) M KBr solutions using a surface force apparatus.
  • Applied Derjaguin-Landau-Verwey-Overbeek (DLVO) theory to analyze force curves.

Main Results:

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  • Film thickness increased linearly with deposited layers under high compression.
  • Identical surfaces exhibited electrostatic double-layer repulsion at large separations.
  • Non-DLVO electrosteric repulsion was observed at shorter separations due to polyelectrolyte chains.
  • Dissimilar surfaces showed attractive forces at large separations due to electrostatic attraction and bridging.

Conclusions:

  • Surface forces in PAH/PSS multilayers are a combination of electrostatic and electrosteric effects.
  • Polyelectrolyte bridging contributes to attraction between dissimilar multilayers.
  • Force measurements provide insights into PEM assembly and interfacial behavior.