Negative axial thermal expansion coefficient of carbon nanotubes: Experimental determination based on measurements of coefficient of thermal expansion for aligned carbon nanotube reinforced epoxy composites.
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| Title: | Negative axial thermal expansion coefficient of carbon nanotubes: Experimental determination based on measurements of coefficient of thermal expansion for aligned carbon nanotube reinforced epoxy composites. |
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| Authors: | Shirasu, Keiichi1 keiichi.shirasu@rift.mech.tohoku.ac.jp, Yamamoto, Go1, Tamaki, Itaru1, Ogasawara, Toshio2, Shimamura, Yoshinobu3, Inoue, Yoku4, Hashida, Toshiyuki1 |
| Source: | Carbon. Dec2015, Vol. 95, p904-909. 6p. |
| Subjects: | Axial loads, Thermal expansion, Carbon nanotubes, Epoxy resins, Heat resistant materials, Mechanical behavior of materials |
| Abstract: | Due to their superior material properties, carbon nanotubes (CNTs) have many potential applications such as actuators, composites and electronic components. These CNT-based devices may experience high temperature during manufacture and operation. This leads to thermal expansion and residual stress in devices, and affects the device reliability. Therefore, the coefficient of thermal expansion (CTE) of CNTs is an important property for CNT-based devices. Although the CTE in radial direction of CNTs have been investigated using X-ray diffraction, there is no experimental determination for the axial CTE of CNTs and only numerical and theoretical predictions exit. Here, we investigated the CTE of aligned multi-walled CNT (MWCNT) reinforced epoxy composites in the MWCNT alignment direction in the temperature range of 30–60 °C. We demonstrated that the CTE of the composites in the MWCNT alignment direction became negative by addition of more than 10.4 vol.% MWCNTs, and the axial CTE of MWCNTs was deduced to be −1.2 × 10 −5 K −1 using the rule of mixtures. In addition, the thermal contraction phenomenon was observed in thin sheets of MWCNTs alone. The negative CTE may be explained by out-of-plane atomic vibrations predicted by theoretical and numerical studies. [ABSTRACT FROM AUTHOR] |
| Copyright of Carbon is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 110865953 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Negative axial thermal expansion coefficient of carbon nanotubes: Experimental determination based on measurements of coefficient of thermal expansion for aligned carbon nanotube reinforced epoxy composites. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Shirasu%2C+Keiichi%22">Shirasu, Keiichi</searchLink><relatesTo>1</relatesTo><i> keiichi.shirasu@rift.mech.tohoku.ac.jp</i><br /><searchLink fieldCode="AR" term="%22Yamamoto%2C+Go%22">Yamamoto, Go</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Tamaki%2C+Itaru%22">Tamaki, Itaru</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Ogasawara%2C+Toshio%22">Ogasawara, Toshio</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Shimamura%2C+Yoshinobu%22">Shimamura, Yoshinobu</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Inoue%2C+Yoku%22">Inoue, Yoku</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Hashida%2C+Toshiyuki%22">Hashida, Toshiyuki</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Carbon%22">Carbon</searchLink>. Dec2015, Vol. 95, p904-909. 6p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Axial+loads%22">Axial loads</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+expansion%22">Thermal expansion</searchLink><br /><searchLink fieldCode="DE" term="%22Carbon+nanotubes%22">Carbon nanotubes</searchLink><br /><searchLink fieldCode="DE" term="%22Epoxy+resins%22">Epoxy resins</searchLink><br /><searchLink fieldCode="DE" term="%22Heat+resistant+materials%22">Heat resistant materials</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+behavior+of+materials%22">Mechanical behavior of materials</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Due to their superior material properties, carbon nanotubes (CNTs) have many potential applications such as actuators, composites and electronic components. These CNT-based devices may experience high temperature during manufacture and operation. This leads to thermal expansion and residual stress in devices, and affects the device reliability. Therefore, the coefficient of thermal expansion (CTE) of CNTs is an important property for CNT-based devices. Although the CTE in radial direction of CNTs have been investigated using X-ray diffraction, there is no experimental determination for the axial CTE of CNTs and only numerical and theoretical predictions exit. Here, we investigated the CTE of aligned multi-walled CNT (MWCNT) reinforced epoxy composites in the MWCNT alignment direction in the temperature range of 30–60 °C. We demonstrated that the CTE of the composites in the MWCNT alignment direction became negative by addition of more than 10.4 vol.% MWCNTs, and the axial CTE of MWCNTs was deduced to be −1.2 × 10 −5 K −1 using the rule of mixtures. In addition, the thermal contraction phenomenon was observed in thin sheets of MWCNTs alone. The negative CTE may be explained by out-of-plane atomic vibrations predicted by theoretical and numerical studies. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Carbon is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.carbon.2015.09.026 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 6 StartPage: 904 Subjects: – SubjectFull: Axial loads Type: general – SubjectFull: Thermal expansion Type: general – SubjectFull: Carbon nanotubes Type: general – SubjectFull: Epoxy resins Type: general – SubjectFull: Heat resistant materials Type: general – SubjectFull: Mechanical behavior of materials Type: general Titles: – TitleFull: Negative axial thermal expansion coefficient of carbon nanotubes: Experimental determination based on measurements of coefficient of thermal expansion for aligned carbon nanotube reinforced epoxy composites. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Shirasu, Keiichi – PersonEntity: Name: NameFull: Yamamoto, Go – PersonEntity: Name: NameFull: Tamaki, Itaru – PersonEntity: Name: NameFull: Ogasawara, Toshio – PersonEntity: Name: NameFull: Shimamura, Yoshinobu – PersonEntity: Name: NameFull: Inoue, Yoku – PersonEntity: Name: NameFull: Hashida, Toshiyuki IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 12 Text: Dec2015 Type: published Y: 2015 Identifiers: – Type: issn-print Value: 00086223 Numbering: – Type: volume Value: 95 Titles: – TitleFull: Carbon Type: main |
| ResultId | 1 |
