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Related Experiment Video

Updated: Jul 11, 2026

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Published on: May 21, 2014

Osmotic force resisting chain insertion in a colloidal suspension.

M Castelnovo¹, R K Bowles, H Reiss

¹Department of Chemistry and Biochemistry, University of California Los Angeles, Los Angeles, California 90095, USA. castel@chem.ucla.edu

The European Physical Journal. E, Soft Matter

|March 11, 2004

Summary

Inserting a stiff chain into colloidal suspensions requires work due to excluded volume forces. This resistance force, calculated using scaled particle theory and scaling arguments, is significant for biophysical processes.

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Area of Science:

Colloid and Polymer Physics
Biophysics

Background:

Colloidal suspensions and polymer solutions are ubiquitous in nature and industry.
Understanding the interactions between chains and particles is crucial for various applications.

Purpose of the Study:

To calculate the free energy and force associated with inserting a stiff chain into a colloidal suspension.
To investigate the role of excluded volume forces in this process.

Main Methods:

Scaled Particle Theory (SPT) for hard sphere fluids.
Simple scaling arguments for flexible polymer solutions.

Main Results:

Calculated the work per unit length as the force resisting chain insertion.
For nanometer-scale chains and colloids, forces are on the order of tens of pN at moderate volume fractions.
Demonstrated the applicability of theoretical models to predict these forces.

Conclusions:

The insertion force is a critical parameter governing chain behavior in colloidal media.
These forces are relevant to biophysical phenomena, such as DNA ejection from viral capsids.
The study provides a quantitative basis for understanding chain-colloid interactions.