Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 2 of 2
Full-Text Articles in Physics
Transitions Of Tethered Chain Molecules Under Tension, Jutta Luettmer-Strathmann, Kurt Binder
Transitions Of Tethered Chain Molecules Under Tension, Jutta Luettmer-Strathmann, Kurt Binder
Jutta Luettmer-Strathmann
An applied tension force changes the equilibrium conformations of a polymer chain tethered to a planar substrate and thus affects the adsorption transition as well as the coil-globule and crystallization transitions. Conversely, solvent quality and surface attraction are reflected in equilibrium force-extension curves that can be measured in experiments. To investigate these effects theoretically, we study tethered chains under tension with Wang-Landau simulations of a bond-fluctuation lattice model. Applying our model to pulling experiments on biological molecules we obtain a good description of experimental data in the intermediate force range, where universal features dominate and finite size effects are small. …
Partition Function Zeros And Finite Size Scaling For Polymer Adsorption, Mark Taylor, Jutta Luettmer-Strathmann
Partition Function Zeros And Finite Size Scaling For Polymer Adsorption, Mark Taylor, Jutta Luettmer-Strathmann
Jutta Luettmer-Strathmann
The zeros of the canonical partition functions for a flexible polymer chain tethered to an attractive flat surface are computed for chains up to length N = 1536. We use a bond-fluctuation model for the polymer and obtain the density of states for the tethered chain by Wang-Landau sampling. The partition function zeros in the complex e(β)-plane are symmetric about the real axis and densest in a boundary region that has the shape of a nearly closed circle, centered at the origin, terminated by two flaring tails. This structure defines a root-free zone about the positive real axis and follows …