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In vivo Measurement of the Mouse Pulmonary Endothelial Surface Layer

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Published on: February 22, 2013

Interactions between amphoteric surfaces with strongly overlapping double layers.

Mark Vis¹, Remco Tuinier, Bonny W M Kuipers

¹Laboratory of Physical Chemistry, Faculty of Chemical Engineering and Chemistry & Institute for Complex Molecular Systems, Eindhoven University of Technology, The Netherlands. M.Vis@tue.nl.

|June 1, 2018

Summary

This summary is machine-generated.

This study describes the entropic repulsion between charged plates using Donnan equilibrium. It reveals a finite disjoining pressure at contact and a universal inverse square decay at large separations, validated by simulations.

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Area of Science:

Colloid and Surface Science
Physical Chemistry
Electrochemistry

Background:

Electrical double-layers (EDLs) govern interactions between charged surfaces in electrolyte solutions.
Amphoteric plates with charge-regulation exhibit complex EDL behavior.
Understanding EDL overlap is crucial for predicting colloidal stability and interfacial phenomena.

Purpose of the Study:

To theoretically describe the entropic repulsion between overlapping EDLs on amphoteric plates.
To investigate the influence of charge-regulation and electrolyte equilibrium on inter-plate forces.
To determine the potential and disjoining pressure at plate contact and for varying separations.

Main Methods:

Application of Donnan equilibrium theory in the limit of zero electric field.
Modeling amphoteric plates with charge-regulation in equilibrium with a monovalent electrolyte reservoir.
Comparison of theoretical results with self-consistent field computations solving the Poisson equation.

Main Results:

A finite electric potential and disjoining pressure exist at plate contact due to complete discharging.
For low potentials, EDL decay is governed by a characteristic length scale and contact potential.
A universal inverse square decay of disjoining pressure is observed at large separations, independent of contact potential.

Conclusions:

Donnan equilibrium theory accurately predicts EDL interactions between amphoteric plates.
Charge-regulation significantly impacts inter-plate forces, leading to contact disjoining pressure.
The study provides a theoretical framework and validation for understanding forces in confined colloidal systems.