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Related Experiment Video

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Investigating Single Molecule Adhesion by Atomic Force Spectroscopy

Investigating Single Molecule Adhesion by Atomic Force Spectroscopy

Published on: February 27, 2015

Steric repulsion by adsorbed polymer layers studied with total internal reflection microscopy.

Dzina Kleshchanok¹, Peter R Lang

¹Forschungszentrum Jülich, Institut für Festkörperforschung, Weiche Materie, 52425 Jülich, Germany.

Langmuir : the ACS Journal of Surfaces and Colloids

|March 14, 2007

Summary

Total internal reflection microscopy measured polymer interactions with latex spheres and glass. Increasing poly(ethylene oxide) concentration enhanced steric repulsion, aligning with the Alexander-de Gennes model.

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Last Updated: Jul 16, 2026

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Single-Molecule Imaging of Lateral Mobility and Ion Channel Activity in Lipid Bilayers using Total Internal Reflection Fluorescence (TIRF) Microscopy

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Area of Science:

Surface science
Colloid science
Polymer physics

Background:

Understanding particle-surface interactions is crucial in colloid and surface science.
Polymer adsorption significantly influences colloidal system behavior.
Charge-stabilized polystyrene latex spheres and glass interfaces are model systems.

Purpose of the Study:

To quantify the interaction potential between polystyrene spheres and a glass wall.
To investigate the effect of poly(ethylene oxide) concentration on this interaction.
To determine the dominant forces governing the interaction, specifically steric repulsion and polymer depletion.

Main Methods:

Utilized Total Internal Reflection Microscopy (TIRM) to probe sphere-wall interactions.
Systematically varied the concentration of poly(ethylene oxide) in the surrounding medium.
Analyzed the interaction potential based on experimental measurements.

Main Results:

Observed that poly(ethylene oxide) adsorption leads to steric repulsion between spheres and the wall.
Found no evidence of attractive forces due to polymer depletion.
Demonstrated that increased polymer concentration strengthens the steric repulsion effect.
Validated the Alexander-de Gennes model for brush repulsion at high polymer concentrations.

Conclusions:

Polymer adsorption on surfaces dominates the interaction potential, primarily through steric repulsion.
Polymer depletion attraction is not a significant factor in this system.
The Alexander-de Gennes model accurately describes steric repulsion in concentrated polymer solutions.