Hello!
I am using DEP to trap gold nanoparticles on the fiber surface. I am using 15vrms and 100kHz to trap particles. After trapping gold NPs, why does the impedance increase compared to DI water? Shouldn't it go down after trapping to the electrode surface? I have seen similar scenarios while using polystyrene particles. For polystyrene, it can go up but for gold, it should go down.
Any thoughts would be appreciated. Thanks.
Hi Tonoy,
what is the label for x and y-axis in both plots? y-axis ohm and phase angle and x-axis log(f)? Also, what is DI+Field? What is 20M/40M?
Jasper
Hi Jasper,
Thank you for your reply. Yes, you are correct about the axis labels.
DI+Field is the impedance recorded when there was no particle in the system. It is just pure DI water with the field applied for a few minutes.
Tonoy
Ok, and what is 20M/40M? Maybe an idea for further investigations:
The presence of the GNP seems to alter the low frequency response, which is likely linked to the electrical double layer. This can be seen, in my opinion, when looking into the phase plot below 10^4 Hz. Lower phase angle indicates the absence of significant capacitive currents.
How did you record the data? How do you measure impedance with and without a field?
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