Separation and Manipulation of Rare-earth
Oxide Particles by Dielectrophoresis
Teacher：Yi-Chu Hsu
Speakers：Kun-Feng Lu(呂昆峰)
Department of Mechanical Engineering
& Institute of Nanotechnology,
Southern Taiwan University, Tainan, TAIWAN
Date：2011/11/11
Outline
• Experimental
• Results and Discussion
• Conclusion
Experimental
Liquid sample：15μl
AC voltage：5-100 V
Frequency：10 Hz－2 MHz
1. microelectrode arrays
3. glass substrate
2. chamber wall of polymethyl acrylate
4. gap between arrays
1. signal generator
3. Microscope
5. PC
2. DEP microchip
4. Video
Results and Discussion
Conclusion
• Within a certain range of particle size, particle translation
voltage decreases as particle size increases.
• Particles of the same rare-earth oxide can be classified based
on their sizes by regulating the voltage.
• Low frequencies are better to manipulate rare-earth oxide
particles by DEP. Rare-earth oxides with different valences can
be separated.
• Under higher frequency conditions, rare-earth oxide particles
with different size are captured using one-step DEP by
regulating the voltage.
• At frequency of 50 Hz different rare-earth oxides may be
separated by means of multi-step DEP.
Thank you for your attention!!