Pulling an adsorbed polymer chain off a solid surface

Details Pulling an adsorbed polymer chain off a solid surface Pulling an adsorbed polymer chain off a solid surface

2009-04-07

arxiv.org/abs/0904.1106v2

Eur. Phys. J. E 29, 285-297 (2009)

Physics

Condensed Matter

Soft Condensed Matter

17 pages, 9 pictures

Scientific paper

10.1140/epje/i2009-10492-8

The thermally assisted detachment of a self-avoiding polymer chain from an adhesive surface by an external force applied to one of the chain ends is investigated. We perform our study in the "fixed height" statistical ensemble where one measures the fluctuating force, exerted by the chain on the last monomer when a chain end is kept fixed at height $h$ over the solid plane at different adsorption strength $\epsilon$. The phase diagram in the $h - \epsilon$ plane is calculated both analytically and by Monte Carlo simulations. We demonstrate that in the vicinity of the polymer desorption transition a number of properties like fluctuations and probability distribution of various quantities behave differently, if $h$ rather than $f$ is used as an independent control parameter.

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