1 Erratum to: Exp Fluids DOI 10.1007/s00348-010-0882-4

In the original publication the Acknowledgments was incomplete. The full text of the Acknowledgments reads as follows:

This work was supported by Rockwell Automation, Inc. and NASA (Contract No. NNC09CA36C). The authors thank L. Lin, D. Taber and B. Wen for EWOD device fabrication, technical assistance, and helpful discussion.