Adsorption of a semiflexible wormlike chain |
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Authors: | AN Semenov |
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Institution: | (1) Institut Charles Sadron, 6 rue Boussingault, 67083 Strasbourg Cedex, France, FR |
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Abstract: | Adsorption of ideal polymers with stiff backbone onto a flat surface is considered theoretically. Both scaling approach and
quantitative theory are developed. We predict a self-similar monomer concentration profile c(x) ∼ x
-4/3 near the surface (when the distance to the surface x is much smaller than the chain persistence length l /2). The typical conformation of a weakly adsorbed chain can be viewed as a sequence of alternating flat (2-dimensional)
trains of wormlike short loops (flat blobs) and coil-like (3-dimensional) loops forming a triple-layer structure: contact
layer (x < Δ) of adsorbed fragments virtually laid on the surface, proximal layer (Δ < x < l) of flat blobs, and more dilute distal corona layer (x > l). Here Δ defines the range of monomer/surface attraction, Δ ≪ l. The adsorption transition is continuous. However, its relative width is small (T
* is the adsorption temperature, ΔT is the relevant temperature interval): ∼
, i.e. a discontinuous transition in the limit Δ/l↦ 0.
Received 10 October 2002 and Received in final form 22 November 2002
RID="a"
ID="a"Permanent address: Physics Department, Moscow State University, Moscow 119992, Russia. e-mail: semenov@polly.phys.msu.ru |
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Keywords: | PACS 61 25 Hq Macromolecular and polymer solutions polymer melts swelling – 67 70 +n Films (including physical adsorption) |
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