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首頁> 外文期刊>Journal of Micromechanics and Microengineering >Numerical studies of manipulation and separation of Janus particles in nano-orifice based DC-dielectrophoretic microfluidic chips
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Numerical studies of manipulation and separation of Janus particles in nano-orifice based DC-dielectrophoretic microfluidic chips

機(jī)譯：納米孔基DC型電泳微流體芯片操縱與janus顆粒的操縱與分離的數(shù)值研究

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The direct current dielectrophoretic (DC-DEP) manipulation and separation of polystyrene-based Janus particles and the homogeneous polystyrene particles in microchannels are numerically investigated. To induce the DEP force, a small electric potential difference is applied across the microchannel via a smaller nano-orifice on one side of the channel walls and a larger micro-orifice on the opposite channel wall. A strong non-uniform electric field gradient is generated by the asymmetric orifices, and the particles will undergo the DEP forces when moving with the flow through the vicinity of the small orifice, where the strongest electrical field gradient exists. By adjusting the electrical conductivity of the suspending solution, one kind of the particles will experience the negative DEP force while another will undergo the positive DEP force. In this way, the separation of 5 mu m Janus particles and homogeneous polystyrene particles, and the separation of 3 mu m and 5 mu m Janus particles were numerically demonstrated. Moreover, in order to further understand the dielectrophoretic motion of the Janus particles, the DC-DEP force on the Janus particles was analyzed and the effects of the electric fields, as well as the coating coverage, thickness, and electric conductivity of the Janus particles were studied. The results show that the Janus particles with gold coating coverage over 50% will experience positive DEP forces and be attracted towards the maximum electric fields. It is also found that the effect of the gold coating thickness of the Janus particles on their trajectories can be neglected when using the DC-DEP method.
機(jī)譯：在數(shù)值上研究了基于直流介電泳（DC-DEP）操縱和分離的基于聚苯乙烯的Janus顆粒和均相聚苯乙烯顆粒。為了誘導(dǎo)DEP力，通過溝道壁的一側(cè)上的較小納米孔在微通道上施加小的電電位差和在相對(duì)的通道壁上的較大微孔。通過不對(duì)稱孔產(chǎn)生強(qiáng)的非均勻電場(chǎng)梯度，并且當(dāng)與流過小孔附近的流動(dòng)時(shí)，顆粒將經(jīng)歷Dep力，其中存在最強(qiáng)的電場(chǎng)梯度。通過調(diào)節(jié)懸浮液的導(dǎo)電率，將顆粒的一種顆粒體現(xiàn)為負(fù)DEP力，而另一個(gè)顆粒將經(jīng)歷正化力。以這種方式，在數(shù)值上證明了5μmjanus顆粒和均相聚苯乙烯顆粒的分離，以及3μm和5μmjanus顆粒的分離。此外，為了進(jìn)一步了解Janus顆粒的介電泳運(yùn)動(dòng)，分析了Janus顆粒上的DC-Dep力，以及電場(chǎng)的影響，以及Janus顆粒的涂覆覆蓋，厚度和導(dǎo)電性研究過。結(jié)果表明，金涂層覆蓋率超過50％的Janus顆粒將體驗(yàn)積極的Dep力并被吸引到最大電場(chǎng)。還發(fā)現(xiàn)，當(dāng)使用DC-DEP方法時(shí)，可以忽略Janus顆粒在其軌跡上的金涂層厚度的效果。

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