This article from the American Institute of Physics reports on research at Rutgers regarding the separation of two sets of differently charged sand grains. The two kinds of sand are shaken in a container together and poured out in a beaker, where they separate. The article includes applications of the research and setbacks the group experienced, as well as a link to pictures of the experiment.
<a href="http://www.compadre.org/informal/items/detail.cfm?ID=9431">American Institute of Physics. Spontaneous Separation of Charged Grains. College Park: American Institute of Physics, July 12, 2007.</a>
%0 Electronic Source %D July 12, 2007 %T Spontaneous Separation of Charged Grains %I American Institute of Physics %V 2015 %N 30 March 2015 %8 July 12, 2007 %9 text/html %U http://www.aip.org/pnu/2007/832.html
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