In our work we have observed that synthesized oil - based - MR fluid shows affinity towards an engine oil, when brought close to each other.
It is observed that oil based MR fluid gets attached to the engine oil and the engine oil is found to float above the MR fluid, without mixing.
We wanted to know:
1) the reasons for Affinity between the fluids
2) The probable means of quantifying the physical properties of these fluids responsible for their unmixed attachment.
Could you please share your thoughts on the above points?
The MR fluid particles are little magnets that tend to clump together into the smallest volume possible (minimum potential). They will even clump together in the base MR fluid. The particle surfactants create double layer that keep the particles sliding over each other. Of course, "free" oil has affinity to "trapped" oil in the MR, at a lower scale is just oil.
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