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题名: Controlling SWCNT assembling density by electrokinetics
作者: Yu HB(于海波) ; Hermann, Sascha ; Dong ZL(董再励) ; Mai, John ; Li WR(李文荣) ; Schulz, Stefan E.
作者部门: 机器人学研究室
关键词: Assembly ; Dielectric devices ; Electric fields ; Electric properties ; Electrodes ; Electrodynamics ; Electromagnetic fields ; Electronic properties ; Electroosmosis ; Electrophoresis ; Single-walled carbon nanotubes (SWCN)
刊名: Sensors and Actuators, A: Physical
ISSN号: 0924-4247
出版日期: 2013
卷号: 201, 页码:36-42
收录类别: SCI ; EI
产权排序: 1
摘要: Single-walled carbon nanotubes (SWCNTs) as the colloid in a colloidal solution can be polarized in a non-uniform electric field and experience a net force that is the so-called dielectrophoresis (DEP) force, due to the interaction between the induced dipoles and the electric field. The positive DEP force can be usedto position and assemble arrays of SWCNTs. Inversely, the negative DEP force can be utilized to separate SWCNTs in terms of their electronic properties. Moreover, Joule heating generated by the electric field can lead to other electrokinetics forces in the colloidal solution, which give rise to fluidic motion of the solution. Additionally, at low frequencies, the electrical double layer also induces a steady fluidic motion, a phenomenon known as AC electroosmotic flow. These fluidic motion in turn exerts a drag force on thenanotubes. Hence, to controllably assemble SWCNTs using DEP force is a non-trivial task. In this article, the mechanisms of electrokinetics and electrohydrodynamics are systematically analyzed through numerical simulations for a set of parameters that are typically used for assembling SWCNTs between metalelectrodes. Finally, experimental results from the frequency-dependent assembly of SWCNTs using this set of parameters are described and discussed. These results show that the density of SWCNTs assembled between electrodes can be varied by controlling the electrokinetics parameters.
语种: 英语
WOS记录号: WOS:000325836400004
WOS标题词: Science & Technology ; Technology
类目[WOS]: Engineering, Electrical & Electronic ; Instruments & Instrumentation
关键词[WOS]: WALLED CARBON NANOTUBES ; DIELECTROPHORESIS ; MANIPULATION ; TRANSISTORS ; SEPARATION ; SOLVENT ; DEVICES ; FIELD
研究领域[WOS]: Engineering ; Instruments & Instrumentation
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内容类型: 期刊论文
URI标识: http://ir.sia.cn/handle/173321/12551
Appears in Collections:机器人学研究室_期刊论文

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