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Updated: Jul 4, 2026

Sub-nanometer Resolution Imaging with Amplitude-modulation Atomic Force Microscopy in Liquid
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Sub-nanometer Resolution Imaging with Amplitude-modulation Atomic Force Microscopy in Liquid

Published on: December 20, 2016

Visualization of hydrophobic polyelectrolytes using atomic force microscopy in solution.

Axel Gromer1, Michel Rawiso, Mounir Maaloum

  • 1Institut Charles Sadron CNRS - UPR 22 23, rue du Loess BP 84047, 67034 Strasbourg Cedex 2, France.

Langmuir : the ACS Journal of Surfaces and Colloids
|June 28, 2008
PubMed
Summary

Hydrophobic polyelectrolytes like polystyrene sulfonate (PSS) change shape based on surface charge. Highly charged PSS chains extend fully, while low-charge chains collapse, impacting nanostructured surface design.

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Investigating Single Molecule Adhesion by Atomic Force Spectroscopy
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Investigating Single Molecule Adhesion by Atomic Force Spectroscopy

Published on: February 27, 2015

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Sub-nanometer Resolution Imaging with Amplitude-modulation Atomic Force Microscopy in Liquid
10:25

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Published on: December 20, 2016

Investigating Single Molecule Adhesion by Atomic Force Spectroscopy
09:48

Investigating Single Molecule Adhesion by Atomic Force Spectroscopy

Published on: February 27, 2015

Area of Science:

  • Polymer Science
  • Surface Chemistry
  • Materials Science

Background:

  • Understanding polyelectrolyte behavior on surfaces is crucial for advanced materials.
  • Hydrophobic polyelectrolytes, such as polystyrene sulfonate (PSS), exhibit complex adsorption phenomena.
  • Surface properties significantly influence polymer chain conformation and morphology.

Purpose of the Study:

  • To investigate the morphology of hydrophobic polyelectrolytes adsorbed on different surfaces.
  • To determine how charge density affects PSS chain conformation.
  • To analyze the influence of surface type on PSS chain behavior and properties.

Main Methods:

  • Atomic Force Microscopy (AFM) was employed to visualize polymer morphology.
  • Polystyrene sulfonate (PSS) chains with varying charge densities (32%, 67%, 92%) were synthesized.
  • Adsorption studies were conducted on mica and mixed lipid bilayers (neutral and cationic lipids).

Main Results:

  • Low-charge density PSS (32%) collapsed into spherical globules.
  • High-charge density PSS (67%, 92%) chains extended fully on surfaces.
  • Persistence length of PSS chains was found to be surface-dependent.
  • Ordered monolayers formed on lipid bilayers with increased cationic lipid proportion.

Conclusions:

  • PSS chain conformation is dictated by charge density and substrate interactions.
  • Highly charged PSS chains exhibit DNA-like behavior on surfaces, enabling new nanostructure designs.
  • Tailoring polyelectrolyte properties can lead to novel functionalized surfaces.