Abstract
We present a new ab initio approach to describe the statistical behavior of long ideal polymer chains near a plane hard wall. Forbidding the solid half-space to the polymer explicitly (by the use of Mayer functions) without any other requirement, we derive and solve an exact integral equation for the partition function G D(r,r′, N) of the ideal chain consisting of N bonds with the ends fixed at the points r and r′ . The expression for G(r,r′, s) is found to be the sum of the commonly accepted Dirichlet result G D(r,r′, N) = G 0(r,r′, N) - G 0(r,r”, N) , where r” is the mirror image of r′ , and a correction. Even though the correction is small for long chains, it provides a non-zero value of the monomer density at the very wall for finite chains, which is consistent with the pressure balance through the depletion layer (so-called wall or contact theorem). A significant correction to the density profile (of magnitude 1/\( \sqrt{{N}}\)is obtained away from the wall within one coil radius. Implications of the presented approach for other polymer-colloid problems are discussed.
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Erukhimovich, I.Y., Johner, A. & Joanny, J.F. The ideal polymer chain near planar hard wall beyond the Dirichlet boundary conditions. Eur. Phys. J. E 27, 435–445 (2008). https://doi.org/10.1140/epje/i2008-10392-5
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DOI: https://doi.org/10.1140/epje/i2008-10392-5