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Strain-driven Self-rolling Mechanism For Anomalous Coiling Of Multilayer Nanohelices

L. Dai, W. Shen
Published 2009 · Physics

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We have proposed a comprehensive model based on a Cosserat curve to investigate the strain-driven self-rolling mechanism for anomalous coiling of multilayer nanohelices from the biaxial-torque point of view. Special attention has been paid to the edge effects, which dominate the anomalous coiling and decrease the helicity angles to as small as 0. By quantitatively explaining the experiments, we have demonstrated that the edge effects not only generate the torsion torque, together with the initial stress perpendicular to the preferential winding direction, to turn the nanobelts, but also offset part of the initial uniaxial bent torque. Our derived expressions can be used experimentally to determine the geometry of multilayer nanohelices with all helicity angles. The present work has provided useful information for the future experimental investigation on multilayer nanohelices as well as their application in meta-/quantum-devices.
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