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Forces between Surfaces with Weakly End-Adsorbed Polymers

Martin, J. I. and Wang, Z.-G. and Zuckerman, D. and Bruinsma, R. and Pincus, P. (1997) Forces between Surfaces with Weakly End-Adsorbed Polymers. Journal de Physique II, 7 (8). pp. 1111-1121. ISSN 1155-4312. doi:10.1051/jp2:1997175.

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We study the interaction forces between two plates in a semi-dilute solution of polymers each having one weakly adsorbing end-group. We show that this system exhibits both repulsive and attractive interactions of comparable magnitude and well-separated length scales: when the plate separation is within a range of order the end-to-end distance of the end-adsorbed polymer, repulsion arises with a magnitude of ϵ Φ/Na³ where ϵ is the end-adsorption energy, N is the degree of polymerization, a is the Kuhn length and Φ the volume fraction of the polymer. This repulsion is due to desorption of the end-adsorbed chains. At plate separations of order the correlation length of the solution, a depletion attraction sets in with a magnitude that scales with the bulk osmotic pressure.

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Wang, Z.-G.0000-0002-3361-6114
Additional Information:© 1997 Les Editions de Physique. Received 9 October 1996, revised 10 April 1997, accepted 22 April 1997.
Issue or Number:8
Record Number:CaltechAUTHORS:20200320-144002936
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Official Citation:Forces between Surfaces with Weakly End-Adsorbed Polymers. J.I. Martin, Z.-G. Wang, D. Zuckerman, R. Bruinsma et P. Pincus. J. Phys. II France, 7 8 (1997) 1111-1121 DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:102032
Deposited By: Tony Diaz
Deposited On:20 Mar 2020 23:27
Last Modified:16 Nov 2021 18:08

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