Pulling adsorbed self-avoiding walks from a surface

Anthony Guttmann, I Jensen, S G Whittington

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


We consider a self-avoiding walk model of polymer adsorption where the adsorbed polymer can be desorbed by the application of a force, concentrating on the case of the square lattice. Using series analysis methods we investigate the behaviour of the free energy of the system when there is an attractive potential with the surface and a force f applied at the last vertex, normal to the surface, and extract the phase boundary between the ballistic and adsorbed phases. We believe this to be exact to graphical accuracy. We give precise estimates of the location of the transition from the free phase to the ballistic phase, which we find to be at yc = exp (f/kBT c) = 1, and from the free phase to the adsorbed phase, which we estimate to be at ac = exp ( - /kBTc) = 1.775 615 ± 0.000 005. In addition we prove that the phase transition from the ballistic to the adsorbed phase is first order.

Original languageEnglish
Article number015004
Number of pages15
JournalJournal of Physics. A. Mathematical and Theoretical
Issue number1
Publication statusPublished - 10 Jan 2014


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