AI Article Synopsis
- The study employs molecular dynamics simulations to investigate how an adsorbed homopolymer behaves when stretched away from a substrate while measuring the vertical force experienced by the chain.
- Results indicate that as the polymer is extended, the force reaches a plateau, which increases linearly with substrate interaction energy in strong adsorption scenarios, aligning with theoretical predictions.
- In weak adsorption conditions, the polymer forms a layered globule structure that deforms elastically when stretched, allowing for predictive modeling of the force needed for complete detachment relative to the polymer's critical extension.
Article Abstract
Using molecular dynamic simulation, we study the stretching of an adsorbed homopolymer in a poor solvent with one end held at a distance ze from the substrate. We measure the vertical force f on the end of the chain as a function of the extension ze 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 increases 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.
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| http://dx.doi.org/10.1103/PhysRevE.70.012801 | DOI Listing |
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