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Effect of particle-particle interaction on dielectrophoretic single particle trap in a sudden contraction flow(PDF)

《纳米技术与精密工程》[ISSN:1672-6030/CN:12-1351/O3]

期数:
2018年4期
页码:
236-241
栏目:
出版日期:
2018-12-15

文章信息/Info

Title:
-
作者:
 Haihang Cui Rui Ma Li Chen Hongyan Zhang
 School of Environment and Municipal Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
Author(s):
-
关键词:
 DEP  Single particle  Interaction force  Pulsed DEP
Keywords:
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分类号:
-
DOI:
-
文献标识码:
A
摘要:
Dielectrophoretic (DEP) force is significant in manipulating tiny objects in micro/nano scale. To study the effect of electric interaction force on particle manipulation, a microstructure consisting of a pair of strip electrodes and a sudden contraction micro-channel was constructed. Besides DEP force and hydrodynamic force acting on single particle, the numerical model also involved electric interaction force and force moment on two particles. The analyses revealed that the particle-particle interaction force was in the same order as that of DEP force on single trapped particle. The interaction force resulted in trapping single particle failure under continuous DEP force. Thus, pulsed DEP force, turning on/off DEP force at a given time interval, was suggested. During the “off” period, the velocity difference of the two particles located at sudden contraction micro-channel enlarged the gap be?tween them and further weakened the particle-particle interaction. By a proof-of-concept experiment, both the trapping behavior of single particle and that of two particles were in good agreement with the model. With carefully controlled parameters, the reliable function of retaining single particle was realized by pulsed DEP.
Abstract:

参考文献/References

备注/Memo

备注/Memo:
 Corresponding author.
E-mail address: cuihaihang@xauat.edu.cn (H. Cui).
https://doi.org/10.1016/j.npe.2018.12.006
2589-5540/Copyright ? 2018 Tianjin University. Publishing Service by Elsevier B.V. on behalf of KeAi Communications Co., Ltd. This is an open access article under the CC BY-NC-ND license
(http://creativecommons.org/licenses/by-nc-nd/4.0/).
更新日期/Last Update: 2019-03-14