Published July 1, 2001
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Journal Article
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Measurement of long-range steric repulsions between microspheres due to an adsorbed polymer
- Creators
- Owen, R. J.
- Crocker, J. C.
- Verma, R.
- Yodh, A. G.
Chicago
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Abstract
We have measured the interparticle potential between pairs of micron-sized silica spheres induced by adsorbed polyethylene oxide polymer using a line-scanned optical tweezer. We found this long-range steric repulsion to be exponential over the range of energies (0.1kBT–5kBT) and polymer molecular weights (452 000–1 580 000) studied, and that the potential scaled with the polymer's radius of gyration RG. The potential's exponential decay length was about 0.6RG and its range was about 4RG, although both parameters varied significantly from one pair of spheres to another. The potential's exponential prefactor was greater than mean-field predictions.
Additional Information
©2001 The American Physical Society Received 7 October 2000; published 11 June 2001 We are delighted to acknowledge extensive discussions about the theory with Albert Johner and Scott Milner. We also thank Russ Composto, Nili Dan, Lyderic Bocquet, Bill Russell, and Randy Kamien for useful discussions. R.J.O. was funded at the University of Pennsylvania by Thouron Scholarship Fund. This work was supported by the NSF through Grant No. DMR-99-71226 and partially by the NSF-MRSEC through Grant No. DMR-96-32598.Files
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- CaltechAUTHORS:OWEpre01
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