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Biophys. J. BioFAST: First Published May 19, 2006. doi:10.1529/biophysj.106.084434
© 2006 by the Biophysical Society.

A more recent version of this article appeared on July 15, 2006.
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BIOPHYSICAL LETTERS

Probing the double layer: effect of image forces on AFM

Frederick Sachs 1*

1 SUNY - Buffalo

* To whom correspondence should be addressed. E-mail: sachs{at}buffalo.edu.

Submitted on March 22, 2006
Revised on April 6, 2006
Accepted on 17 April 2006


  Abstract
Force probes such as AFM tips or laser trap latex beads have a dielectric constant much less than that of the water that they displace. Thus when a probe approaches a charged surface under water it will be repelled simply based upon the image forces, and these can be of nN magnitude.

Key Words: Debye, Poisson Boltzmann, force, membrane, surface charge




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Biophys. J., January 15, 2007; 92(2): 699a - 699a.
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Copyright © 2006 by the Biophysical Society.