ID | 113994 |
著者 |
Enders, Matthias
University of Tokushima|RheinMain University of Applied Sciences
Mukai, Shinya
University of Tokushima
Uwada, Takayuki
Josai University
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資料タイプ |
学術雑誌論文
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抄録 | A temperature gradient can induce solutes to migrate from a hot to a cold region, and vice versa, in solution. This process, termed thermophoresis, has been applied to manipulate, transport, and separate various macromolecules and colloids by exploiting a microscale temperature gradient. Here we describe using a single gold nanoparticle (AuNP) as an efficient nanoscale heating source to promote thermophoresis. Moreover, on introducing a substrate with high thermal conductivity such as sapphire, a strong local temperature gradient can be shaped in the medium near the AuNP under continuous wave laser illumination. We observed molecules such as polyethylene glycol and sodium dodecyl sulfate being transported toward the AuNP and attaching to its surface, forming a gold core–organic shell structure within several tens of seconds of illumination. Spectroscopically, because of the gradual increasing encapsulation, progressive red shifts with enhanced scattering intensities were seen for the localized surface plasmon resonance bands of the AuNP with increasing cycles of illumination. Post-mortem scanning electron microscopy provided direct evidence of shell formation. Our technique is relevant to nanofabrication based upon optical heating at the nanometer scale.
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掲載誌名 |
The Journal of Physical Chemistry C
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ISSN | 19327447
19327455
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cat書誌ID | AA1217589X
AA12192210
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出版者 | ACS Publications
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巻 | 120
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号 | 12
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開始ページ | 6723
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終了ページ | 6732
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発行日 | 2016-03-07
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権利情報 | This document is the Accepted Manuscript version of a Published Work that appeared in final form in The Journal of Physical Chemistry C, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.jpcc.5b11762.
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言語 |
eng
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著者版フラグ |
著者版
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部局 |
理工学系
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