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Measuring colloidal forces with the magnetic chaining technique

Author:
R. Dreyfus   D. Lacoste   J. Bibette and J. Baudry  


Journal:
The European Physical Journal E - Soft Matter


Issue Date:
2009


Abstract(summary):

In 1994 Leal Calderon et al. (Phys. Rev. Lett. 72, 2959 (1994)) introduced the magnetic chaining technique to directly probe the force-distance profile between colloidal particles. In this paper, we revisit this approach in two ways. First, we describe a new experimental design which allows us to utilize sample volumes as low as a few microliters, involving femtomoles of surface active macromolecules. Secondly, we extensively describe the characterization and preparation of the magnetic colloids, and we give a quantitative evaluation of performance and resolution of the technique in terms of force and interparticle separation.


Page:
113-123


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