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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...
Autores principales: | , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2013
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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. |
format | Online Article Text |
id | pubmed-6270074 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2013 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
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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