Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2010-06-03
Physics
Condensed Matter
Statistical Mechanics
13 pages with four figures
Scientific paper
We analyze equilibrium properties and adsorption desorption phase transition behaviour of a linear semiflexible copolymer chain under constrained geometrical situation on square lattice in a good solvent. One dimensional stair shaped line imposes geometrical constrain on the chain. Lattice model of fully directed self avoiding walk is used to model the chain, semiflexibility of the chain is accounted by introducing energy barrier for each bend of the chain. Exact expression of the partition function of the chain is obtained using generating function technique for the cases, viz. (i) constrained copolymer chain is in the bulk, (ii) constrained copolymer chain interacting with an impenetrable flat surface, (iii) constrained copolymer chain interacting with constraint itself and (iv) general expression of the partition function of the copolymer chain, interacting with a flat surface and geometrical constraint (stair shaped line). We have compared bulk properties and adsorption desorption transition behaviour of a linear semiflexible homopolymer chain without constraint to the case when the chain is constrained.
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