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Direct measurement of colloidal forces

Direct measurement of colloidal forces We present a novel approach that allows us to directly determine the force-distance law between tiny colloidal particles. Our technique exploits the fact that the anisotropy of the forces between dipoles causes particles to form chains. Because chains give rise to a strong Bragg diffraction of the visible light, the interdroplet spacing is accurately measured. Moreover, because the attractive dipolar magnetic force can be varied through the intensity of the external field, the balancing repulsive force can also be measured at various spacings. We give first evidence of the feasibility of this approach by using monodisperse magnetic emulsions under magnetic field. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review Letters American Physical Society (APS)

Direct measurement of colloidal forces

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Publisher
American Physical Society (APS)
Copyright
Copyright © 1994 The American Physical Society
ISSN
1079-7114
DOI
10.1103/PhysRevLett.72.2959
Publisher site
See Article on Publisher Site

Abstract

We present a novel approach that allows us to directly determine the force-distance law between tiny colloidal particles. Our technique exploits the fact that the anisotropy of the forces between dipoles causes particles to form chains. Because chains give rise to a strong Bragg diffraction of the visible light, the interdroplet spacing is accurately measured. Moreover, because the attractive dipolar magnetic force can be varied through the intensity of the external field, the balancing repulsive force can also be measured at various spacings. We give first evidence of the feasibility of this approach by using monodisperse magnetic emulsions under magnetic field.

Journal

Physical Review LettersAmerican Physical Society (APS)

Published: May 2, 1994

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