Stretching helical nano-springs at finite temperature

Details Stretching helical nano-springs at finite temperature Stretching helical nano-springs at finite temperature

2008-03-28

arxiv.org/abs/0803.4140v1

EPL 77, 68001 (2007)

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1209/0295-5075/77/68001

Using dynamic simulations and analytic methods, we study the elastic response of a helical filament subject to uniaxial tension over a wide range of bend and twist persistence length. A low-pitch helix at low temperatures exhibits a stretching instability and the force-extension curve consists of a sequence of spikes. At elevated temperature (i.e. small persistence lengths) the helix melts and a pronounced force plateau is obtained in the fixed-extension ensemble. The torque boundary condition significantly affects the resulting elastic properties.

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