Effect of induced surface charge of metal particles on particle sizing by resistive pulse sensing technique.
Effect of induced surface charge of metal particles on particle sizing by Resistive Pulse Sensing (RPS) technique is reported in this paper. The relationship between the magnitude of the RPS signal and the applied voltage was experimentally studied with 5 μm polystyrene particles and 5 μm magnetic particles in a microfluidic chip. It is shown that the magnitude of RPS signal of the magnetic particles is larger than that of the polystyrene particle under the same measuring voltage. This may be understood by the induced thicker electrical double layer (EDL) around the magnetic particles. This effect is important and should be considered when sizing metal particles and other highly-polarizable particles by using the RPS technique.
Department of Marine Engineering, Dalian Maritime University, Dalian 116026, China.
Yongxin
Y
Song
Department of Marine Engineering, Dalian Maritime University, Dalian 116026, China.
Chengfa
C
Wang
Department of Marine Engineering, Dalian Maritime University, Dalian 116026, China.
Runzhe
R
Sun
Department of Marine Engineering, Dalian Maritime University, Dalian 116026, China.
Xinxiang
X
Pan
Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada. Electronic address: dongqing@uwaterloo.ca.
Dongqing
D
Li
Induced charge effect; Metal particle sizing; Resistive pulse sensing