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Updated: Jun 25, 2026

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

Complex adsorption behavior of rodlike polyelectrolyte-surfactant aggregates.

Chris S Hodges¹, Simon Biggs, Lynn Walker

¹Institute of Particle Science and Engineering, University of Leeds, Leeds, United Kingdom LS2 9JT. c.s.hodges@leeds.ac.uk

Langmuir : the ACS Journal of Surfaces and Colloids

|March 6, 2009

Summary

Quartz crystal microbalance (QCM) and optical reflectometry reveal polyelectrolyte-surfactant aggregate adsorption at silica interfaces. Combining techniques distinguishes bulk from interface signals, clarifying adsorption mechanisms.

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Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces

Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces

Published on: September 9, 2022

Area of Science:

Surface Science
Colloid and Interface Science
Materials Chemistry

Background:

Polyelectrolyte-surfactant aggregates form weakly anionic, rod-like structures in solution.
Understanding their adsorption behavior at interfaces is crucial for various applications.
Previous models proposed a two-stage adsorption process involving initial ion adsorption and surface charge reversal.

Purpose of the Study:

To quantify the long-term adsorption behavior of polyelectrolyte-surfactant aggregates at the silica-water interface.
To distinguish between bulk fluid and interfacial contributions to adsorption signals.
To elucidate the adsorption kinetics and mechanism using complementary techniques.

Main Methods:

Quartz crystal microbalance (QCM) to measure adsorbed mass.
Optical reflectometry (OR) to probe interfacial properties.
Simultaneous application of QCM and OR to analyze adsorption dynamics.

Main Results:

Optical reflectivity (OR) data confirmed a two-stage adsorption model.
OR isotherms showed a plateau at higher concentrations, unlike QCM isotherms.
QCM data indicated significant bulk fluid influence at increased concentrations.
Discrepancies in slow signal changes between QCM and OR suggest bulk effects, not layer densification.

Conclusions:

Combining QCM and OR provides a clearer understanding of adsorption processes.
The study clarifies the influence of bulk fluid on QCM measurements.
The findings enhance the understanding of polyelectrolyte-surfactant aggregate adsorption mechanisms.