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Forces measured between latex spheres in aqueous electrolyte : Non-DLVO behavior and sensitivity to dissolved gas

journal contribution
posted on 1999-03-02, 00:00 authored by R Considine, R Hayes, Roger Horn
An atomic force microscope was used to measure the forces acting between two polystyrene latex spheres in aqueous media. The results show an electrostatic repulsion at large separations which is overtaken by an attractive “hook” that pulls the two spheres into contact from a considerable range (20−400 nm), much larger than could be expected for a van der Waals attraction. The range of operation of this attraction varies from one experiment to another and is not correlated with electrolyte concentration. However, the range is found to decrease significantly when the level of dissolved gas in the water is reduced.

History

Journal

Langmuir

Volume

15

Issue

5

Pagination

1657 - 1659

Publisher

American Chemical Society

Location

Washington, D.C.

ISSN

0743-7463

eISSN

1520-5827

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

1999, American Chemical Society

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