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Article Dans Une Revue Physical Review E : Statistical, Nonlinear, and Soft Matter Physics Année : 2004

Stretching an adsorbed polymer globule

Résumé

Using molecular dynamic simulation, we study the stretching of an adsorbed homopolymer in a poor solvent with one end held at a distance $z_e$ from the substrate. We measure the vertical force $f$ on the end of the chain as a function of the extension $z_e$ and the substrate interaction energy $w$. The force reaches a plateau value at large extensions. In the strong adsorption limit, we show that the plateau value increase linearly in $w$ in good agreement with a theoretical model. In the weak adsorption limit, a polymer globule with a layered structure is formed and elastically deformed when stretched. In both cases a simple theoretical model permits us to predict the relation between the necessary force to fully detach the polymer and its critical extension.

Dates et versions

hal-00015176 , version 1 (08-12-2005)

Identifiants

Citer

Franck Celestini, Thomas Frisch, Xabier Oyharcabal. Stretching an adsorbed polymer globule. Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, 2004, 70, n° 1, Art. 012801, p. 1-4. ⟨10.1103/PhysRevE.70.012801⟩. ⟨hal-00015176⟩
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