High-Efficiency Unipolar Charger for Sub-10 nm Aerosol Particles Using Surface-Discharge Microplasma with a Voltage of Sinc Function

Manirakiza, Eric; Seto, Takafumi; Osone, Saho; Fukumori, Kanta; Ōtani, Yoshio

doi:10.1080/02786826.2012.725492

Cited by 14 publications

(9 citation statements)

References 22 publications

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“…Among these techniques, surface dielectric barrier discharge (SDBD), which is sometimes called surface microdischarge (SMD), attracts significant attention in different applications. It is applied effectively in the ion production process for the aerodynamic flow control [5] and charging aerosols [6,7]. It is also used as a plasma-based chemical reactor in many environmental applications, such as ozone production [8][9][10], NOx conversion [11], decomposition of VOCs [12,13], inactivation of microorganisms, and killing bacteria [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Characterization of surface dielectric barrier discharge influenced by intermediate frequency for ozone production

Abdelaziz

Ishijima

Seto

et al. 2016

Plasma Sources Sci. Technol.

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The aim of this study is to investigate the effect of the intermediate frequency (1-10 kHz) of the sinusoidal driving voltage on the characteristics of a developed surface dielectric barrier discharge (SDBD)-based reactor having spikes on its discharge electrode. Moreover, its influence on the production of ozone and nitrogen oxide byproducts is evaluated. The results show that SDBD is operated in the filamentary mode at all the frequencies. Nevertheless, the pulses of the discharge current at high frequencies are much denser and have higher amplitudes than those at low frequencies. The analysis of the power consumed in the reactor shows that a small portion of the input power is dissipated in the dielectric material of SDBD source, whereas the major part of the power is consumed in the plasma discharge. The results of the ozone production show that higher frequencies have a slightly adverse effect on the ozone production at relatively high energy density values, where the ozone concentration is slightly decreased when the frequency is increased at the same energy density. The temperature of the discharge channels and gas is not a crucial factor for the decomposition of ozone in this reactor, while the results of the measurements of nitrogen oxides characteristics 2 indicate that the formation of NO and NO 2 has a significant adverse effect on the production efficiency of ozone due to their oxidation to another nitrogen oxides and their catalytic effect.

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Section: Introductionmentioning

confidence: 99%

Characterization of surface dielectric barrier discharge influenced by intermediate frequency for ozone production

Abdelaziz

Ishijima

Seto

et al. 2016

Plasma Sources Sci. Technol.

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“…While this study and recent related works (Ehn et al 2011;Steiner and Reischl 2012;Steiner et al 2014;Maisser et al 2015) show clearly that the mass and mobility distributions of ions generated is a function of the material used in the measurement/sampling system, future studies will need to be carried out to examine the influence of the manner of bipolar ion production has on the bipolar charge distribution. Ionizing radiation from radioactive sources (e.g., Po-201, Am ¡241, Ni-63 and Kr-85), corona discharges (Stommel and Riebel 2005), soft X-rays (Shimada et al 2002), and microplasmas (Manirakiza et al 2013) has been used in bipolar diffusion charging. Such ion generation methods may produce ions of a different chemical composition than Po-210, even within otherwise identical measurement systems.…”

Section: Discussionmentioning

confidence: 99%

The Bipolar Diffusion Charging of Nanoparticles: A Review and Development of Approaches for Non-Spherical Particles

Gopalakrishnan

McMurry

Hogan

2015

Aerosol Science and Technology

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Theoretical and experimental analyses of the steady state, bipolar diffusion charge distribution on nanoparticles are reviewed. This charge distribution plays a critical role in electrical mobility measurements of nanoparticle size distribution functions, where it is approximated via empirical regression equations. While the regression approach has been broadly successful, there remain several unresolved issues related to charge distribution calculations. Specifically, research to date has not revealed a method to reliably calculate nanoparticle-ion collision rates in the presence of strong attractive potentials, charge distribution predictions do not routinely consider the mass and (electrical) mobility distributions of the charging ions, and calculation approaches applicable to both spherical and nonspherical particles have not been compared to experimental data. In light of these issues, we examine the steady-state bipolar charge distribution on gold nanospheres and gold nanorods via tandem differential mobility analysis (TDMA). We compare measurements to regression equations as well as to Brownian Dynamics (BD) simulations, which take ion mobility and mass distributions as inputs. These distributions were measured using a DMA coupled to a mass spectrometer. Both regression equations and BD simulations are found to agree reasonably well with measurements in air, and we find that particle mobility diameter has a much greater influence on charging than particle morphology. Results support the use of BD calculations to predict bipolar charge distributions when ion properties are known. Nevertheless, our work supports continued use of regression equations when such information is not available.

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“…In this study we developed a method to focus the deposition of nanoparticles using a commercial nanometer aerosol sampler (NAS; TSI-model 3089) with simple improvements, coupled with a surface-discharge microplasma aerosol charger (SMAC; Manirakiza et al, 2011) for high throughput aerosol charging. The charged aerosol flux was focused simply by placing a metal mesh (electrically grounded) on a polymer film (insulator) and electrode (3 kV).…”

Section: Introductionmentioning

confidence: 99%

Focused Deposition of Nanoparticles on Polymer Film with an Improved TSI-Nanoparticle Sampler (Model 3089)

Fukumori

Higashi

Naito

et al. 2015

Aerosol Science and Technology

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A two-dimensional array of spots of deposited nanoparticles as small as 7×7 μm was fabricated on a polymer film using a modified commercial nanometer aerosol sampler (NAS; TSI-model 3089) coupled with a surface-discharge microplasma aerosol charger (SMAC). The charged aerosol particles were electrostatically focused by a metal mesh (electrically grounded) on the polymer film (insulator) and electrode (3 kV). The effect of mesh geometry on the concentration ratio (focusing ratio × collection efficiency) was evaluated using monodisperse polystyrene latex particles with diameters of 48, 100, and 300 nm. The electrostatic focusing effect was also analyzed by a numerical simulation of the electrostatic field. The two-dimensional patterning of nanoparticles is an effective method in concentrating particles for the subsequent observation and chemical analysis of aerosol particles. In our experiments, the SMAC-NAS system achieved a net concentration ratio of more than 20 times for 48-and 100-nm particles, which would significantly shorten the aerosol-sampling time. The particle deposition patterns formed on a transparent polymer film may provide samples for analyzing the transmittance, luminescence, and other optical characteristics of deposited nanoparticles.

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High-Efficiency Unipolar Charger for Sub-10 nm Aerosol Particles Using Surface-Discharge Microplasma with a Voltage of Sinc Function

Cited by 14 publications

References 22 publications

Characterization of surface dielectric barrier discharge influenced by intermediate frequency for ozone production

Characterization of surface dielectric barrier discharge influenced by intermediate frequency for ozone production

The Bipolar Diffusion Charging of Nanoparticles: A Review and Development of Approaches for Non-Spherical Particles

Focused Deposition of Nanoparticles on Polymer Film with an Improved TSI-Nanoparticle Sampler (Model 3089)

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