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

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 int...

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Detalles Bibliográficos
Autores principales: Sevick, Edith M., Williams, David R.M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2013
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6270074/
https://www.ncbi.nlm.nih.gov/pubmed/24177696
http://dx.doi.org/10.3390/molecules181113398
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author Sevick, Edith M.
Williams, David R.M.
author_facet Sevick, Edith M.
Williams, David R.M.
author_sort Sevick, Edith M.
collection PubMed
description 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.
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spelling pubmed-62700742018-12-20 A Piston-Rotaxane with Two Potential Stripes: Force Transitions and Yield Stresses Sevick, Edith M. Williams, David R.M. Molecules Article 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. MDPI 2013-10-30 /pmc/articles/PMC6270074/ /pubmed/24177696 http://dx.doi.org/10.3390/molecules181113398 Text en © 2013 by the authors; licensee MDPI, Basel, Switzerland. http://creativecommons.org/licenses/by/3.0/ This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).
spellingShingle Article
Sevick, Edith M.
Williams, David R.M.
A Piston-Rotaxane with Two Potential Stripes: Force Transitions and Yield Stresses
title A Piston-Rotaxane with Two Potential Stripes: Force Transitions and Yield Stresses
title_full A Piston-Rotaxane with Two Potential Stripes: Force Transitions and Yield Stresses
title_fullStr A Piston-Rotaxane with Two Potential Stripes: Force Transitions and Yield Stresses
title_full_unstemmed A Piston-Rotaxane with Two Potential Stripes: Force Transitions and Yield Stresses
title_short A Piston-Rotaxane with Two Potential Stripes: Force Transitions and Yield Stresses
title_sort piston-rotaxane with two potential stripes: force transitions and yield stresses
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6270074/
https://www.ncbi.nlm.nih.gov/pubmed/24177696
http://dx.doi.org/10.3390/molecules181113398
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