非對稱粒子在不同取向下感應電荷電泳之研究

林佳憲

doi:10.6342/NTU201702319

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非對稱粒子在不同取向下感應電荷電泳之研究

Orientation Dependent Induced-Charge Electrophoresis of Metallic Coated Janus Particle

林佳憲 , Masters　　Advisor：江宏仁　　

繁體中文 DOI： 10.6342/NTU201702319

超順磁主動粒子；感應電荷電泳；感應偶極；金屬厚度；不同取向性； Superparamagnetic Janus particle ； Induced-charge electrophoresis ； Induced dipole ； Metal thickness ； Orientation

Abstract │ Reference (49) │ Altmetrics

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Recently, scientists reported that the flows resulting from the action of an applied electric field on its own induced charges around a polarizable structure as “induced-charged electro-osmosis” (ICEO), which is capable of driving Janus particle, whose surfaces have two or more distinct properties, under the electric fields by “induced-charge electrophoresis” (ICEP). However, the directly experimental data of particle velocity for ICEP and flow velocity for ICEO in orientation-dependency with respect to electric fields are seldom investigated by scientists. We achieve that the magnetic moment of superparamagnetic Janus particle can be manipulated by external magnetic fields, the polarization effect of Janus particles with different coating thickness experimentally measured in different orientation under the electric field.
In the case of Janus particles with thin metallic coating, the ICEP motion of particle mainly moves perpendicular to the electric field without magnetic. The ICEP velocity and ICEO flow of Janus particle in different directions are measured in magnetic field and clear orientation dependent velocities are observed. However, for a thick metallic coating, the ICEP motion is dramatically parallel to the electric field without magnetic field and different orientation-dependent velocities are observed. We proposed that the strength of induced dipole of a Janus particle, depending on the thickness of the metallic coating and orientation of a particle, dominates the behavior of ICEP. Finally, this study provide a programmable method to control the particle by a rotating magnetic and frequency adjustment.

Reference ( 49 ) 〈TOP〉

1 Hen-Wei Huang, Mahmut Selman Sakar, Andrew J Petruska, Salvador Pané, and Bradley J Nelson, Nature Communications 7 (2016).
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19 RJ Hunter, Foundations of colloid science 1, 72 (1989).
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