Weiqi Chen1, Dong-Bin Kwak1, J. E. Anderson1, Kaushik Kanna1, Chenxing Pei1, Qingfeng Cao1, Qisheng Ou1, Seong Chan Kim1, Thomas H. Kuehn1, David Y.H. Pui1
1Particle Technology Laboratory, Mechanical Engineering, University of Minnesota, Minneapolis 55455, US