%0 Journal Article %J Analytical Chemistry %D 2007 %T Controlling charge on levitating drops %A Hilger, R. T. %A Westphal, M. S. %A L. M. Smith %B Analytical Chemistry %V 79 %P 6027-6030 %8 Aug %@ 0003-2700 %G eng %R 10.1021/ac070413j