Quincke rotation

Electrorotation differs in many respects to -> Quincke rotation where a particle can spontaneously rotate in an arbitrary sense when subjected to a strong enough DC electric field. 

Figure 18 Quincke rotation of each individual particle resulted from the particle polarization and charge distribution around the polarized particle.

Studied in Berlin, Konigsberg, and Heidelberg. In 1865 he became Professor in Berlin, in 1872 in Wurzburg, and in 1875 in Heidelberg [i]. Q. contributed to the fields of acoustics, optics, electricity, and magnetic susceptibility measurement. In relation to electrochemistry he is remembered for his studies of -> electrokinetic effects, particularly Quincke rotation [ii-vii]. 

An often applied procedure for mechanically stabilizing bubbles is to rotate them in cylindrical tubes towards the centre, Quincke applied this idea as long ago as 1861. Kelsall et reviewed this matter and added their own measurements, mostly in the presence of electrolytes. Intentionally added electrol)des obviously swamp the H and OH ions stemming from the intrinsic dissociation of water. Kellsall et al. used a double laser-Doppler apparatus by which the difference between the bubble rise velocity with and without the applied field could be measured. They found the mobility to depend on size and pH, but it could at least be... 

To counteract Archimedes thrust, a long time ago, Quincke, Me Taggart, and Alty [25-28] placed the bubble in a cylindrical tube filled with an aqueous phase and rotating about its symmetrical axis. The difference between the centrifugal forces acting on the bubble and on the aqueous phase maintains the bubble along the axis of rotation. This system was later abandoned, as the electric field applied to displace the bubble created an electro-osmotic flux within the tube, which biased the results [29]. 

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