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Molecules 2013, 18(11), 13398-13409; doi:10.3390/molecules181113398

A Piston-Rotaxane with Two Potential Stripes: Force Transitions and Yield Stresses

1,*  and 2
Received: 18 September 2013 / Revised: 18 October 2013 / Accepted: 22 October 2013 / Published: 30 October 2013
(This article belongs to the Special Issue Rotaxanes)
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We examine a rod piston-rotaxane system, where the positions of several mobile rings on the axle are controlled by an external force acting on one of the rings. This allows us to access the translational entropy of the rings. For a simple rotaxane molecule with an axle that has uniform ring-axle interactions along its length, the molecule behaves like a miniature piston filled with a one-dimensional ideal gas. We then examine the effect of two stripes on the axle, having different ring-axle interactions with the mobile rings, so that one section is of high energy (repulsive) for the rings and another section is of lower energy (or attractive). This kind of rotaxane can exhibit rapid changes in displacement or force, and in particular, this molecule can exhibit a yield stress in which the piston suddenly compresses under a small increase in the applied force.
Keywords: rotaxane; piston-rotaxane; one-dimensional gas; stripes; stations rotaxane; piston-rotaxane; one-dimensional gas; stripes; stations
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Sevick, E.M.; Williams, D.R. A Piston-Rotaxane with Two Potential Stripes: Force Transitions and Yield Stresses. Molecules 2013, 18, 13398-13409.

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