Convection of charged particles in oil subject to DC bias

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SUMMARY

The discussion centers on the unexpected convective motion of negatively charged micro-particles in hexadecane oil subjected to a DC bias between two vertical electrodes. Instead of moving towards the positive electrode as anticipated, the particles exhibited a convective behavior. Participants suggested verifying the experimental setup and considering the possibility of conductance affecting particle charge dynamics near the electrodes.

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amicus_tobias
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Hi all,

I have recently observed a very strange thing (or rather, I shall say unexpected phenomenon). When I deposited some charged micro-particles between 2 electrodes (vertical plates) with a DC bias in hexadecane oil, I expected the negatively charged particles to go to the positive electrode. But somehow the particles started a convective motion between 2 electrode. Can someone shed some light into this for me? Thank you all.

Toby
 
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Whew, don't think i can answer that one. Until you get an answer, i would double check and make sure your experiment is set up correctly and nothing is interfering.
 
amicus_tobias said:
Hi all,

I have recently observed a very strange thing (or rather, I shall say unexpected phenomenon). When I deposited some charged micro-particles between 2 electrodes (vertical plates) with a DC bias in hexadecane oil, I expected the negatively charged particles to go to the positive electrode. But somehow the particles started a convective motion between 2 electrode. Can someone shed some light into this for me? Thank you all.

Toby

What is insulating them from the positive electrode? Is it possible that you have some conductance so that when they get close to the positive electrode they pick up a positive charge and so reverse course for the negative electrode, where the same thing happens in reverse.
 

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