To continuously separate and extract metal nanoparticles present in a waste liquid or the like at high efficiency in a flow by a simple method.
Ununiform electric field strength is generated by a flow passage obtained by combining a tapered trapezoidal structure 10 and a branched structure (such as a cross structure 12 and a T-shaped structure 18) arranged at the chip part thereof, and, with dielectrophoretic force in branching as the maximum, substances (gold nanoparticles 6) generating positive dielectrophoresis to a circumferential fluid are separated into a flow passage outlet 3 in a rectilinear propagation direction and substances (polystyrene particles 8) generating negative dielectrophoresis are separated into flow passage outlets 1, 2 in directions other than the rectilinear propagation direction.
KAZOE YUTAKA
FUSHIMI MITSUAKI
Keisuke Matsuyama
Tsuyoshi Makino