Conditions for escape of a rotor in a rotary nanobearing from short triple-wall nanotubes

Abstract In a short nanobearing system made from carbon nanotubes, the rotor with high rotational frequency may escape from the stator, which may cause a stability problem to the system of a nanodevice with such a nanobearing. In the present work, nanobearings with tri-walled nanotubes are investiga...

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Autores principales:	Jiao Shi, Ling-Nan Liu, Kun Cai, Qing-Hua Qin
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/2c9f8321374e4993a7d58e3ab6eb20ff
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spelling	oai:doaj.org-article:2c9f8321374e4993a7d58e3ab6eb20ff2021-12-02T11:52:20ZConditions for escape of a rotor in a rotary nanobearing from short triple-wall nanotubes10.1038/s41598-017-07184-x2045-2322https://doaj.org/article/2c9f8321374e4993a7d58e3ab6eb20ff2017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-07184-xhttps://doaj.org/toc/2045-2322Abstract In a short nanobearing system made from carbon nanotubes, the rotor with high rotational frequency may escape from the stator, which may cause a stability problem to the system of a nanodevice with such a nanobearing. In the present work, nanobearings with tri-walled nanotubes are investigated to reveal the conditions for the moving away of the free inner tube from the high-speed rotating middle tube. Experimental results show that the escape happens when the radii difference between the two rotors is larger than 0.34 nm and the rotational frequency of the middle tube is higher than a critical value. And before the escape occurs, the rotational frequency of the inner tube is lower than this critical value. Due to the radii difference being larger than 0.34 nm, the two rotors are non-coaxial, and the centrifugal force of the inner tube results in strong radial and axial interactions between the edges of the two rotors. When the relative sliding speed is relatively high, an edge of the inner rotor will pass through the potential barrier at the adjacent edge of the middle rotor, and further escape from the middle rotor occurs. The selection of a longer middle rotor with smaller radius can increase the critical rotational frequency of the middle rotor.Jiao ShiLing-Nan LiuKun CaiQing-Hua QinNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jiao Shi Ling-Nan Liu Kun Cai Qing-Hua Qin Conditions for escape of a rotor in a rotary nanobearing from short triple-wall nanotubes
description	Abstract In a short nanobearing system made from carbon nanotubes, the rotor with high rotational frequency may escape from the stator, which may cause a stability problem to the system of a nanodevice with such a nanobearing. In the present work, nanobearings with tri-walled nanotubes are investigated to reveal the conditions for the moving away of the free inner tube from the high-speed rotating middle tube. Experimental results show that the escape happens when the radii difference between the two rotors is larger than 0.34 nm and the rotational frequency of the middle tube is higher than a critical value. And before the escape occurs, the rotational frequency of the inner tube is lower than this critical value. Due to the radii difference being larger than 0.34 nm, the two rotors are non-coaxial, and the centrifugal force of the inner tube results in strong radial and axial interactions between the edges of the two rotors. When the relative sliding speed is relatively high, an edge of the inner rotor will pass through the potential barrier at the adjacent edge of the middle rotor, and further escape from the middle rotor occurs. The selection of a longer middle rotor with smaller radius can increase the critical rotational frequency of the middle rotor.
format	article
author	Jiao Shi Ling-Nan Liu Kun Cai Qing-Hua Qin
author_facet	Jiao Shi Ling-Nan Liu Kun Cai Qing-Hua Qin
author_sort	Jiao Shi
title	Conditions for escape of a rotor in a rotary nanobearing from short triple-wall nanotubes
title_short	Conditions for escape of a rotor in a rotary nanobearing from short triple-wall nanotubes
title_full	Conditions for escape of a rotor in a rotary nanobearing from short triple-wall nanotubes
title_fullStr	Conditions for escape of a rotor in a rotary nanobearing from short triple-wall nanotubes
title_full_unstemmed	Conditions for escape of a rotor in a rotary nanobearing from short triple-wall nanotubes
title_sort	conditions for escape of a rotor in a rotary nanobearing from short triple-wall nanotubes
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/2c9f8321374e4993a7d58e3ab6eb20ff
work_keys_str_mv	AT jiaoshi conditionsforescapeofarotorinarotarynanobearingfromshorttriplewallnanotubes AT lingnanliu conditionsforescapeofarotorinarotarynanobearingfromshorttriplewallnanotubes AT kuncai conditionsforescapeofarotorinarotarynanobearingfromshorttriplewallnanotubes AT qinghuaqin conditionsforescapeofarotorinarotarynanobearingfromshorttriplewallnanotubes
_version_	1718395093255192576

Conditions for escape of a rotor in a rotary nanobearing from short triple-wall nanotubes

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