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Updated: Jun 14, 2026

Investigating Single Molecule Adhesion by Atomic Force Spectroscopy
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In situ adhesion measurements utilizing layer-by-layer functionalized surfaces.

Adam J Nolte1, Jun Young Chung, Marlon L Walker

  • 1Polymers Division and Surface and Microanalysis Science Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.

ACS Applied Materials & Interfaces
|April 1, 2010
PubMed
Summary
This summary is machine-generated.

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Investigating poly(dimethylsiloxane) (PDMS) adhesion with layer-by-layer (LbL) coatings revealed that surface roughness and coating stiffness significantly impact adhesion. Tuning pH and surface properties offers control over adhesion for various applications.

Area of Science:

  • Materials Science
  • Surface Chemistry
  • Polymer Science

Background:

  • Poly(dimethylsiloxane) (PDMS) is widely used, but its adhesion properties require precise control.
  • Layer-by-layer (LbL) assembly offers a versatile method for surface functionalization.
  • Understanding adhesion mechanisms is crucial for optimizing material performance.

Purpose of the Study:

  • To investigate the adhesion of LbL-coated PDMS hemispheres to rigid substrates.
  • To explore the influence of surface properties and environmental conditions on adhesion.
  • To assess the potential of LbL assembly for tunable adhesion control.

Main Methods:

  • Utilized Johnson, Kendall, and Roberts (JKR) contact mechanics for adhesion measurements.
  • Performed experiments on PDMS hemispheres coated with polyelectrolyte LbL assemblies.

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  • Conducted measurements against amine-functionalized glass slides in air and aqueous solutions with controlled pH.

    • Main Results:

    • LbL-functionalized PDMS showed reduced adhesion due to increased surface roughness and high Young's modulus.
    • Adhesion in aqueous solutions was tunable by pH, affecting the coating's mechanical properties.
    • Aqueous salt annealing smoothed the LbL surface, significantly increasing adhesion.

    Conclusions:

    • LbL assembly is effective for surface functionalization and in situ adhesion measurements.
    • Adhesion behavior is complex, influenced by chemical, mechanical, and topological coating properties.
    • Predicting adhesion requires a comprehensive understanding of how these properties respond to environmental changes.