"We have conducted a very simple experiment to show that we can control   
   particles on the surface of oil droplets using an electric field," explains   
   Jon Otto Fossum, a professor in the Department of Physics at the university.   
      
    The researchers used micrometre-sized particles of clay and silicone oil   
   droplets for their experiment.  First, the clay particles coated the droplet,   
   but when the voltage was turned on, the clay particles made a ring around the   
   drop. By controlling the    
   strength of the electrical voltage, researchers can control how the particles   
   accumulate in the ring, much like the way your eye controls how much the pupil   
   opens in response to light.
   
      
   The researchers were also able to control the emulsion's properties with   
   electricity. Its features can be turned on and off quickly, without adding new   
   chemicals.   
      
   http://www.ntnu.edu/news/2013-news/droplets   
      
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