Potential of Surface-Discharge Microplasma Device as Ion Source for High-Efficiency Electrical Charging of Nanoparticles

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  • Osone Saho
    Graduate School of Natural Science and Technology, Kanazawa University
  • Manirakiza Eric
    Graduate School of Natural Science and Technology, Kanazawa University
  • Seto Takafumi
    Graduate School of Natural Science and Technology, Kanazawa University
  • Otani Yoshio
    Graduate School of Natural Science and Technology, Kanazawa University
  • Fujimoto Toshiyuki
    Department of Applied Chemistry, Muroran Institute of Technology

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In order to evaluate the potential of surface-discharge microplasma devices (SMDs) as ion sources for high-efficiency electrical charging of nanoparticles, a long SMD was installed in a surface-discharge microplasma aerosol charger (SMAC), and the charging performance of the SMD for aerosol nanoparticles was measured. The intrinsic charging efficiency for 5-nm-diameter particles was approximately 60%, and that for 10-nm-diameter particles was 90% at an aerosol flow rate of 1.5 L · min−1 because a long SMD is capable of generating a uniform concentration of ions over a wide area. The size-dependent charging efficiencies for these aerosol nanoparticles with diameters ranging between 3 nm and 30 nm were in good agreement with those predicted using the diffusion charging theory. The product of ion concentration (N) and charging time (t), estimated via the diffusion charging theory, was 3.0×1013 s · m−3, which is one order of magnitude higher than that for previously reported chargers. These results confirm the high potential of SMDs as ion sources for charging aerosol nanoparticles.

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