2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 8-9, 2014

8aA-1
September 8th (Mon.), <10:00-12:00>
Room 1

Helix-Sense Inversion of Poly(β-Phenethyl L-Aspartate) andPiezoelectricity.
○

Kazuhiro TANIMOTO*,***, Nariaki ITO**, Kouki SHIBATA**, Hidemine
FURUYA**, Akihiro ABE**, Hisayoshi NISHIZAKI*, Teruyuki TADA*, Yuki
SHIOMI*, Munehiro DATE****, Eichi FUKADA**** and Yoshiro TAJITSU**Graduate School of Engineering, Kansai University **Mitsui Chemicals, Inc.
***Graduate School of Science and Engineering, Tokyo Institute of Technology****Kobayashi Riken

Abstract:
It has been reported that poly(β-phenethyl L-aspartate) (PPLA) exhibits
irreversibly inversion from right-handed to left-handed helixes in a solid state at
130-140 °C. On the other hand, semicrystalline chiral polymers show shear
piezoelectricity. We measured the temperature dependence of piezoelectricity
of PPLA film. As a result, PPLA showed shear piezoelectricity and sign
inversion of the piezoelectric constant at approximately 140 °C. Our results
imply that the orientation was maintained after the sign inversion.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8aA-2
September 8th (Mon.), <10:00-12:00>
Room 1High Piezoelectirc Performance of Poly(lactic acid)Film
Manifactured by Solid State Extrusion and the High-order
Structure by POM Observation○

Mitsunobu Yoshida*, Takayuki Onogi*, Katsuki Onishi*, Hideyuki Sugitani,
Teruyuki Tada, Syota Hayashi, and Yoshiro Tajitsu*○*Mitsui Chemicals Inc., **Graduate School of Engineering, Kansai University

Abstract:
Recently, the development of a speaker, an actuator, and a pressure
sensor using a piezoelectricity of uniaxial stretching poly(L-lactic acid);(PLLA) film has been progressed. However, the shear piezoelectric
constant d14 of a conventional uniaxial stretched PLLA film is 6-10pCN-1 that issomewhat insufficiency for the applications. Therefore, further improvement isdesired. In this study, we carried out solid-state extrusion (SSE) to stretch andorient poly(D-lactic acid) (PDLA) and verified its effects on piezoelectricperformance. By using the SSE, we succeeded in increasing the piezoelectric
constant of PLLA to 20 pCN-1 or more.
And we investigated high-order
structure of stretched film by polarization microscope (POM).

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8aA-3
September 8th (Mon.), <10:00-12:00>
Room 1

Recharge of Electret Filter after Washing by Triboelectric
Charging○

Yasuhiro NAKAMURA, Yasutaka INANAGA and Koji OTA

Mitsubishi Electric Co. Advanced Technology R&D Center.

Abstract:
Privately held

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8aA-4
September 8th (Mon.), <10:00-12:00>
Room 1

Thermal Endurance of Nano-composite Insulating Materialof LDPE andAl2O3 Composed by Mixed Addition with Azobenzoic
compound,Yoshiaki Yamano
Faculty of Education Chiba University

Abstract:
This report presents test results after 5200 h from the start of thermal
endurance test (aging test) on an insulating material of nano-composite with
mixed addition. The nano-composite with mixed addition is originally designed toobtain a basic concept for long term endurance to electrical treeing deterioration.
The composite was prepared by a mixed addition of azobenzoic compound andAl2O3 nano-particle into LDPE. 4'-hydroxyazobenzene-2-carboxylic acid(‘hc_Ab’) was chosen as a candidate. Experimental results with test materials
before the aging test showed that an incubation time from voltage application totree appearance was almost 1000 times longer than that for the base polymer
under the constant applied voltage. The aging test is carrying out undertemperatures, 87 °C, 92 °C and 95 °C. Properties for evaluations of theendurance are change in weight, resistance, UV absorption characteristics, etc.
After 5200 h from the start of the aging, a change of 0.5 % in weight was
detected with the mixed addition stored at 92 °C. By contrast, the change of thebasic polymer was 2 %. The incubation time of the mixed addition was kept
almost unchanged by the aging of
5200 h. The other properties with the test material were not reached tothe end points which were defined in IEC 60216.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8aA-5
September 8th (Mon.), <10:00-12:00>
Room 1

Study on the Dielectric Properties of Composite Materials○

Sou KATOU*，Hanzhi YANG*,Mahmudul KABIR*,Masafumi SUZUKI*Miyuki
OGISHIMA**,Akihisa KUWAKI***Graduate School of Engineering and Resource Science Akita University，**SWCC SHOWA CABLE SYSTEMS CO., LTD.

Abstract:
This research work deals with the dielectric properties of composite
materials made of epoxy resin and ZnO micro varistors. We measured thedielectric properties of the samples with temperature and humidity. The dielectric
permittivity of the samples was calculated and we found that not only thetemperature rise but also the change in humidity is responsible of changing thedielectric permittivity of the composite materials.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8aA-6
September 8th (Mon.), <10:00-12:00>
Room 1

Making of Rotation Symmetry Equivalent Circuit Model andStudy of Loss Current at Low Growth of Water Tree○

Yuta SAITO, Masafumi SUZUKI

Graduate School of Engineering and Resource Science

Abstract:in this study, we made a rotation symmetry equivalent circuit model of
XLPE sheet degraded by water tree. Since the number of partitions was wellenough for the above sheet, the circuit can evaluate even the 10% growth ofwater tree in the sample. Gradually, the loss current at low growth of water tree
was analyzed. As a result, the peak value of the third harmonic current was
found increased but delay in phase was found at the same harmonic current withthe growth of water tree.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8aA-7
September 8th (Mon.), <10:00-12:00>
Room 1

Corona Discharge from a Water Droplet without Disruption
Formed at a Tip of a Capillary Tube○

Takuya Nakajima, Yoshio Higashiyama

Graduated School of Science and Engineering, Yamagata University

Abstract:
Current waveform of negative corona discharge from a water droplet
formed at a capillary electrode consists of the repetitive pulse groups due torepetitive formation and disruption of a Taylor cone. Occurrence frequency ofpulse group would be governed by vibrating frequency of a tip of the droplet
during corona discharge. Disruption of the water droplet appears as the large
first pulse in a pulse group. The waveform without the first pulse in each pulse
group was accidentally observed. This means that and disruption of a Taylor
cone would never occur. The vibrating frequency of a water droplet during
corona discharge involving without the large first pulse in a pulse group varies
from 2 to 4kHz and is strongly affected by an applied voltage, while corona
discharge involving with the first pulse keeps almost constant at around 2kHz
independent of the magnitude of applied voltage. Although the height of thecorona pulse group without the first large pulse is a fourth or fifth of that with thefirst pulse, the charge quantity released during a single pulse group in bothcorona discharge aspect is almost the same.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8pA-1
September 8th (Mon.), <15:00-16:45>
Room 1

Current waveform and electric charge in electrostatic
spraying
Kazumasa CHIKU and Hirofumi SHIMOKAWA
Kanagawa Institute of Technology

Abstract:
In this study, current waveform detected in the electrostatic atomizationby the nozzle was made to synchronize with the image of high-speed camera.
The change of the process of the electrostatic atomization phenomenon isobserved from the synchronization, and the electrification process is revealed.
The electric charge required from pulse current form in dependent on the valueof applied voltage and the polarity. The electric charge decreased with thevoltage in tap water, and it increased with the voltage in the pure water. It’s
considered that the electric charge got from current waveform does not agreewith electric charge of the droplet.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8pA-2
September 8th (Mon.), <15:00-16:45>
Room 1

Behavior of a Viscous Water Droplet on a
Super-Hydrophobic Plate under Three-Dimensional Electric
Field○

Takaki Ohuchi，Yoshio Higashiyama*Graduated School of Science and Engineering, Yamagata University

Abstract:
Electrostatic non-contact mixing of a water droplet placed on a superhydrophobic plate was investigated using a resonant vibration under an AC fieldwith a definite frequency. Three-dimensional electric field was employed toenhance liquid flow inside a water droplet and to stir or mix water droplets byirregular vibration as well as resonant vibration. Sinusoidal waves withresonant frequency of 10Hz were applied to a pair of semispherical electrodes
and to a electrode located above a 100mL water droplet placed onsuper-hydrophobic plate coated with HIREC. The deformation rate of a viscous
water droplet with a viscosity from 0.9 to 29 mPa･s was measured from theimages taken by a high-speed video camera. Under the three-dimensional AC
electric field, a water droplet was largely deformed during resonant vibration,
especially in the vertical direction due to the presence of vertical field. The
deformation rate in the vertical direction of a distilled water droplet with aviscosity of 0.9 mPa･s was 1.8, while a viscous water droplet with 29 mPa･s was
1.3. The mixing performance of a viscous droplet should be confirmed by thissystem.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8pA-3
September 8th (Mon.), <15:00-16:45>
Room 1

Electrification and division of the electrified water droplet on
the super hydrophobic surface○

Yusuke FUTAMI and Hirofumi SHIMOKAWA
Kanagawa Institute of Technology

Abstract:
In the previous report, in which dropped on the hydrophobic surface ofthe silica type, the droplet was charged negatively, and small ejected droplet was
charged positively. In addition, the hydrophobic surface was charged positively.
In this report, charging droplet was dropped on the hydrophobic surface of thesilica type. As the result, the surface was charged positively and small ejected
droplet was charged positive. But, when the water droplet with greatly negatively
charge was dropped, small ejected droplet was charged negatively.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8pA-4
September 8th (Mon.), <15:00-16:45>
Room 1The discharge characteristics by RF burst plasma using
plasma-based ion implantation○

Nobuyuki FUJIMURA, Hiromitsu NOGUCHI, Kazuhiro SHIMONO, Hiroshi
TOYOTA and Takeshi TANAKA
Hiroshima Institute of Technology

Abstract:
Plasma-based ion implantation (PBII) is a technique used to modify thesurface of samples by immersion in plasma and application of a negative bias
voltage to the target. In the PBII method, an ion and a radical are produced byapplying a negative pulse voltage to an item and the reaction by it inactivatesbacteria spore. Method of generating plasma using PBII has only self-ignited
plasma or combination of self-ignited plasma and RF burst plasma. In this study,
the authors examined the plasma generation method of RF burst plasma. The
results, RF burst power required for the plasma generation becomes lower as
the pressure increases.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8pA-5
September 8th (Mon.), <15:00-16:45>
Room 1

Vibrational energy relaxation in atmospheric pressure
streamer discharge
Department of Electrical Engineering, Tohoku University
Department of Electrical Engineering, Tohoku University

Abstract:
Behavior of vibrationally excited molecules in atmospheric pressure
streamer discharge is discussed. Streamer discharge is simulated with ourpreviously developed axis-symmetric 2D model and production and decay
processes of vibrationally excited molecules of nitrogen, oxygen, and watermolecules
arecalculatedbyvibration-to-translation
(V-T)
and
vibration-to-vibration(V-V) reactions. Over the 70% of discharge energy goes tovibrational energy mode of nitrogen and the energy does not reach equilibrium
until 100us in humid air.
This may affect the kinetics of high repetition rate discharge.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8pA-6
September 8th (Mon.), <15:00-16:45>
Room 1The Motion of the Electron in Atom○

Seishu SHIMAMOTO and Yoshio TAKEMOTO

Department of Mechanical and Electrical Engineering, Nippon Bunri University

Abstract:
We derive the electron's equation of motion in atom from the modified
Maxwell equation. Furthermore, we work towards improvements for the Bohratomic model by using of this equation of motion. The relativistic energy in theorbit of the electron in atom is numerically calculated. The calculation resultshows that the similarity between the Planck constant and the angular moment.
These results strongly suggest the existence of the relation between thesurrounding frequency energy, surrounding frequency and the angular moment.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8aB-1
September 8th (Mon.), <10:15-12:00>
Room 2

Adsorptive removal of the underwater cesium ion by a
combination of zeolite and high voltage application○

Yudai TAKEDA, Yuki TAINO, Takuma SUGANO, Hirofumi KURITA, Hachiro
YASUDA, Kazunori TAKASHIMA, Akira MIZUNO
Department of Environmental and life Sciences, Toyohashi University

Abstract:
137Cs is one of the most dangerous radioactive materials due to its long
half-life period of approximately 30 years. Efficient removal of the cesium ions inwater is strongly required. Here, rapid removal of cesium ions by applying pulsed
high voltage to zeolite was carried out. Since cesium ions are positively charged,
they are driven by the electric field. The result showed that when we applied thevoltage, the removal efficiency of the cesium ion increased, and total amount ofabsorbed cesium ions was also increased. Removal rate and effect of voltage
application increased with decreasing Cs+ concentration, suggesting that thismethod can be effective for low-concentration cesium chloride solution likecontaminated water from Fukushima NPP.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8aB-2
September 8th (Mon.), <10:15-12:00>
Room 2

Influence of discharge parameters on the inception voltageof positive streamers in water◯Hidemasa Fujita*、Seiji Kanazawa**、Kiyonobu Ohtani***、Atuski Komiya***、Toshiro Kaneko*、Takehiko Sato***Graduate School of Engineering, Tohoku Univ.*, Department of Electrical &Electronic Engineering, Oita Univ.**、Institute of Fluid Science, Tohoku Univ.***

Abstract:
The influence of the applied voltage, gap distance, capacitance, andwater conductivity on the inception voltage was investigated when a single-shot
pulsed positive voltage with a duration of 10 µs was applied to a needle
electrode with a tip radius of about 40 µm in water. The experimental results
suggest the existence of threshold electric fields for both primary and secondary
streamer inceptions. However the propagation velocity of primary streamers wasconstant regardless of the field strength as well as the gap distance, capacitance,
and water conductivity.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8aB-3
September 8th (Mon.), <10:15-12:00>
Room 2

Effect of Grounding Electrode Length on Corona Discharge
in Electrostatic Precipitator
Yoshihiro Kawada*, Hirotaka Shimizu*, Satoru Ooi**, Akinori Zukeran***Polytechnic University, **Kanagawa Institute of Technology

Abstract:
Electric Precipitator are used for various industries, for example, coalboiler, clean room, road tunnel, air cleaner at home, due to improvement air
environment. Operations of Electrostatic precipitator are suspended particles arecharged with corona discharge section, charged particles are moved withelectric field and collected on collector electrode. Almost power consumption ofelectrostatic precipitator is occurred at corona discharge section. In this paper,present type electrostatic precipitator is used two-stage type, consist of
Pre-charger (corona discharge section) and Collector (electric field section). This
paper focuses on the grounding electrode length of corona discharge fromcompact and low power consumption, thus, the effect of particle charge andparticle collection efficiency with grounding electrode length are considered. We
verified the grounding electrode length by numerical methods and experimental
methods. As results, it has been shown that suitable grounding electrode lengthof corona discharge for particle collection efficiency. Electric field strength nearwith high voltage applied wire electrode is influenced with grounding electrodelength. Thus, it is effect on corona discharge current with suitable grounding
electrode length. Penetrated particles in corona discharge are charged. Hence,collection efficiency depends on grounding electrode length of corona discharge
in pre-charger.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8aB-4
September 8th (Mon.), <10:15-12:00>
Room 2

Electrostatic Precipitator Utilizing Gradient-force －State of Collected Particles on Pole-plates －Atsushi KATATANI*, Hiroshi HOSONO**, Hikaru MURATA**○, Hiroshi YAHATA**,and Akira MIZUNO****Panasonic Environmental Systems & Engineering Co., Ltd, **PanasonicEcology Systems Co., Ltd○, ***Toyohashi University of Technology

Abstract:lthough electrostatic precipitators (ESPs) charge particles which are
passing through corona-discharge space and collect them by Coulomb’s force,the authors have thought that the power consumption in ESPs might drasticallybe decreased if particles could be charged “without using corona-discharge”. To
verify this idea, the authors have tried an experiment as follows. i.e. DC highvoltage was applied to a one-stage ESP composed of parallel flat-plates withoutcorona discharge-spikes. This ESP does not generate corona discharge but
does form non-uniform electric field of 8 kV/cm. The ESP was operated for 18 hunder the diesel-exhaust gas-flow condition of 9 m/s. After the exposure todiesel exhaust, the electrode-plates of the ESP were observed. The result
showed that the ESP collected particles on the electrode-plates without corona
discharge. From the analysis of the vestiges on the plates, the gradient-force isworking for the particle charging. This study implies the possibility of ESPs
without using corona discharge to minimize the electrical power consumption.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8aB-5
September 8th (Mon.), <10:15-12:00>
Room 2

Pilot-scale Experiment of Wet-type Exhaust Gas Treatment
for Glass Melting Furnace Using a Plasma-chemical Hybrid
Process○

Hashira YAMAMOTO*,**，Tomoyuki KUROKI*，Hidekatsu FUJISHIMA* andMasaaki OKUBO**Department of Mechanical Engineering, Osaka Prefecture University, **Nihon
Yamamura Glass Co., Ltd.

Abstract:
PCHP is an innovative technology for simultaneous removal of NOx (NOand NO2) and SOx (SO2 and SO3) that is demonstrated for an exhaust gas inglass melting furnaces. NO is oxidized effectively by injecting ozone with thecooling soft water and compressed air using the three-fluid spray nozzle. The
oxidized NO2 and SO2 are removed at the existing wet-type desulfurization
reactor by absorbing solution.
As a result, de-NOx and de-SOx performance are maintained stable
during 140 min experiment. The volume of exhaust gas is 6,735 m3N/h which iscooled 52°C form 150°C by spray and absorbing solution. When injected ozone
volume is 1,437 g/h, NOx concentration is reduced to 222 ppm from 301 ppm
with removal efficiency of 34% (NO is 38%) in maximum. Furthermore, SO2concentration decreased to more than 98%. It is suggested that the applicationof the PCHP to glass melting furnace with wet-type de-SOx equipment is very
effective.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8aB-6
September 8th (Mon.), <10:15-12:00>
Room 2Ammonia generation using discharge plasma and catalyst
Department of Environmental and Life Sciences,
Kenji YAMASAKI, Takuma NAKAMURA, Hirofumi KURITA, Kazunori
TAKASHIMA, and Akira MIZUNO
Toyohashi University of Technology

Abstract:
Ammonia(NH3) generation from nitrogen and water was experimentallystudied using a simple plasma-catalyst hybrid reactor. This is intended to be analternative to urea hydrolysis used in urea-SCR deNOx system for diesel
engines.A packed bed type plasma reactor was used to generate intensedischarge plasma on the catalyst pellet. Pellets of Al2O3, BaTiO3, TiO2, CeO2,
and Ru supported by Al2O3 were examined as catalyst for NH3 generation.
Effect of carbon monoxide(CO) addition was examined to improve energy
efficiency.Ammonia and nitrogen oxides(NOx) were generated from N2 and H2Oby plasma-catalytic reaction while no product was observed without applicationof discharge plasma. When CO was not supplemented, CeO2 showed thehighest ammonia generation but it was smaller than that of NOx generation. With
CO addition, Ru resulted in very high NH3 generation and very low NOx
generation (nearly zero) compared with other catalysts. Maximum energy
efficiency for NH3 generation in this method was 1.1g/kWh.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8pB-1
September 8th (Mon.), <15:00-15:45>
Room 2

Interaction of nonthermal plasma and Ag-supported zeolite
Hyun-Ha Kim
National Institute of Advanced Industrial Science and Technology

Abstract:
In this work, we report the interaction of nonthermal plasma andAg-supported zeolite for the effective removal of volatile organic compounds(VOCs). The Si/Al ratio affected the status of Ag, which in turn leaded to adifferent catalytic performance. The higher the Si/Al ratio, the higher the metallic
Ag and the larger the reduction in relative resistivity. The propagation of surface
streamer became weak as the Si/Al ratio increased. These electro- and physicalproperties of zeolites were found to be closely linked with the catalytic activity of
Ag/zeolite. The direct interaction of surface plasma with the surface of zeolite
was also evidenced by the electron spin resonance (ESR) spectrometer. The
possible mechanism on these observation will be discussed.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8pB-2
September 8th (Mon.), <15:00-15:45>
Room 2

Experiment and Simulation of CO2 Decomposition Using
Dielectric Barrier Discharge○

Yota YOSHIDA, Naoki SHIRAI, Satoshi UCHIDA, Fumiyoshi TOCHIKUBOTokyo Metropolitan University,

Abstract:
We studied CO2 decomposition using dielectric barrier discharge andpacked bed discharge with coaxial electrode configuration at atmosphericpressure aiming the conversion into methanol. To discuss the possibility of
conversion of CO2 into methanol, the reaction pathway was investigated by thereaction simulation using CHEMKIN. The simulation results suggest that therate-limiting reaction is the hydrogenation of CH2O.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8pB-3
September 8th (Mon.), <15:00-15:45>
Room 2

Effect of Reverse Water-Gas Shift and Methanation
Reactions on Plasma-assisted Dry Methane Reforming○

Seigo KAMESHIMA*, Keishiro TAMURA*, Sampson MOORE**, Tomohiro
NOZAKI**Dept. of Mechanical Sciences and Engineering, Tokyo Institute of Technology,**Dept. of Mechanical Engineering, University of Minnesota

Abstract:
This study focuses on the reaction mechanism of low temperatureplasma-assisted dry methane reforming (DMR). At low temperature (< 500 °C),
CO2 is reduced by H2 catalytically, which may produce either CO (CO2 + H2 =CO + H2O; reverse water-gas shift reaction) or CH4 (CO2 + 4H2 = CH4 + 2H2O;
methanation). We found that the RWGS is dominant reaction pathway, while
CH4 production has negligible effect. Plasma-catalyst hybrid reaction converted
CO2 beyond chemical equilibrium. On the other hand, H2 conversion was
smaller than CO2 conversion probably because the formation of water isprobably the rate-determining step for the RWGS.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8pC-1
September 8th (Mon.), <16:00-16:45>
Room 2

Study on the Decomposition Performance of theFormaldehyde by Photocatalyst which Processed by the
Indirect Dielectric Barrier Discharge○

Tomonari TSURUMI, Masashi TOJO, Shota YAZAWA, Yusuke KUDO, Tetsuro
OTSUKA
College of Industrial Technology, Nihon University

Abstract:
A photocatalyst works by only light. It is very clean and can be used
semipermanently. Therefore, a photocatalyst is environment-friendly. A
photocatalyst has a useful characteristic such as an oxidative decomposition
and a super-hydrophilicity. We have been studying about the removal
performance of the formaldehyde by photocatalyst substrate which processedby an electric discharge. In this study, indirect electric discharge was used forprocessing substrates. The evaluation method of substrate was formaldehyde
decomposition.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8pC-2
September 8th (Mon.), <16:00-16:45>
Room 2

Study on HCHO Decomposition Performance of
Photocatalyst Substrate Produced by Electrostatic
Atomization
Shota YAZAWA, Tomonari TSURUMI, Masayuki EGASHIRA, Yusuke KUDO,
Tesuro OTSUKA and Junji KOIDO
College of Industrial Techology, Nihon University

Abstract:
A photocatalyst works by only light. It is very clean and can be used
semipermanently. Therefore, a photocatalyst is environment-friendly. A
photocatalyst has a useful characteristic such as an oxidative decomposition
and a super-hydrophilicity. We have been studying about fabrication ofphotocatalyst substrate which produced by an electrostatic atomization. In thisstudy, photocatalyst substrates were produced by an electrostatic atomization incone-jet mode. The evaluation method of substrate was formaldehyde
decomposition.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8pC-3
September 8th (Mon.), <16:00-16:45>
Room 2Fundamental characteristics of sheet stapler using positive
and negative corona charging○

Keisuke OZAWA，Toshiyuki SUGIMOTO，Nobuo

NOMURA

Yamagata University*，KASUGA DENKI. INC. **Abstract:
Although there are many sheet products stuck by glue or adhesivematerial, it is very difficult to stick and peel with keeping strong force by theseadhesive materials. In this study, we proposed an electrostatic sheet stapler thatcan stick and peel the sheet material by an electrostatic force. The sheet
material is charged by the positive and negative corona charging using two
needle and grid electrodes. It was found that the electrostatic sheet stapler cancontrol sticking and peeingl force by the corona charging and charge eliminationand that the sticking force is over than 50gf/cm2.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8aC-1
September 8th (Mon.), <10:30-11:45>
Room 3Development of Advanced Water Treatment System Using
Discharge-induced Plasmas○

Seiji KANAZAWA*, Yuki ANAN*, Hiroyuki HAYASHI*, Shuichi AKAMINE*,
Ryuta ICHIKI*,Taketoshi YAMAMURA**, Yutaka YAMAHIRA**, and Youichi
HONZI** Faculty of Engineering, Oita University** TRC Co., Ltd.

Abstract:
Advanced oxidation processes (AOPs) are well known for the treatmentof waste water. AOPs are facilitated by the use of the combination of UV, ozone,
and chemical agents such as hydrogen peroxide. Especially, it is consideredthat the hydroxyl radicals (・OH) play the important role in the process. In thisstudy, a novel advanced oxidation process using the discharge-induced plasma
is proposed. We have developed a system which is combined with filtration,ozonation, and plasmas. The basic property of the discharge-induced plasma
is introduced and then the performance of the system is evaluated.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8aC-2
September 8th (Mon.), <10:30-11:45>
Room 3

Plasma characteristics of discharge in a cell culture medium○

Yusuke Sato*，Takehiko Sato**，Daisuke Yoshino***Graduate School of Engineering, Tohoku University，**Institute of Fluid Science

Abstract:
To apply a plasma directly to cells, generation of plasma in a cell culture
medium and its characteristics have been investigated. Although there are manystudies of plasma in liquids, generation of plasma in a cell culture medium has
not been reported. In this study, to reveal plasma-emission species and effect oforganic compounds in a culture medium, we investigated the spectrum ofplasma emission, OH intensity and H2O2 concentration by comparing with theresults of chloride solutions. The spectra analysis showed little difference
between the cell culture medium and the chloride solutions. OH intensity andH2O2 concentration had a more relationship with electrical conductivity thanchloride species in liquids.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8aC-3
September 8th (Mon.), <10:30-11:45>
Room 3The Effect of Oxygen Concentration and Water Vapor
Evaporated from Agar on Spore Sterilization Using Plasma
Masayuki KOMATSU
The University of Tokyo

Abstract:
The effects of oxygen concentration and water vapor evaporated fromagar medium on plasma sterilization of spore are examined. A nanosecond
pulsed streamer discharge is used. The sterilization rate increases withdecreased N2 gas flow rate. It indicates that reactive species produced fromwater vapor evaporated from the agar medium, such as OH and H2O2, sterilizes
the spore because the humidity on the agar medium due to the evaporated
water from the agar medium increases with the decreased N2 gas flow rate. The
spore is also sterilized by O3. The sterilization area by O3 is much wider thanthat by the reactive species from H2O.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8aC-4
September 8th (Mon.), <10:30-11:45>
Room 3Inactivation of microorganisms on the spherical solid surface
with DBD
Takuya ARISAKA, Takanori TANINO and ○Takayuki OHSHIMA
Graduated School of Engineering, Gunma University

Abstract:
Inactivation of microorganism on the surfaces, such as a soybean andrice, is important in food engineering.
In this research, we used a biodegradable plastic sphere, which has
6 mm in diameter, as a food solid model. The plastic spheres of 25 g were
immersed in Aspergillus niger or Bacillus subtilis spore suspension, and dried atroom temperature overnight. The cell concentration of A. niger and B. subtilis
spore suspension were 1.0×108 CFU/mL and 1.0×106 CFU/mL, respectively.
The electric discharge unit consisted of the silica glass board and the aluminum
two tapes, and AC high voltage (6.2 kVp and
30kHz) was applied to the aluminum tape. DBD (Dielectric Barrier
Discharge) was generated between the aluminum tapes. The electric
discharge unit was put on a rotary shaker (75 rpm), and survival ratios were
measured before and after DBD treatment. In the case of A. niger, the survival
ratio after DBD treatment of 30 min was 10-5. This system was useful for theinactivation of mold on the solid surface. However, it was hard to inactivate B.
subtilis spore with our system. It is thought that expansion of discharging spaceand protraction of contact time are required in order to inactivate B. subtilis
spores.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8pD-1
September 8th (Mon.), <15:00-16:30>
Room 3Development of low-particle-emission corona discharge
ionizer by electrode heating. Part.3 ，○Tomokatsu SATO*，Masanori SUZUKI*，Akira MIZUNO***Technical R&D Center, Techno Ryowa Ltd，**Dept. Environmental and Life
Sciences, Toyohashi University of Technology

Abstract:
Corona discharge type ionizers are widely utilized in clean rooms, suchas those for LCD manufacturing processes. However, these ionizers are also
known to generate particles due to deposition of particles to tip of the electrodes
and then these particles are eventually released into air of clean room. In orderto resolve this problem, we devised a method for inhibiting the deposition ofparticles to tip of the electrodes by heating the electrodes to utilize thethermophoretic force to repel fine particles towards low temperature region. In
the previous paper, we conducted an experiment on heating an ionizer electrodeto approximately 90℃, the amount of deposition of particle on the electrodedecreased in comparison with a case of the non-heating. In addition, as apractical heating method of ionizer electrode, we devised a self-heating-type
electrode using the Joule heating of the resistor. As a result of this experiment,
we found that it was possible to heat the electrode to the desired temperature. In
this paper, we report the results of investigation on heating characteristics ofself-heating-type electrode.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8pD-2
September 8th (Mon.), <15:00-16:30>
Room 3Generation process of induction surge from the charged
body.
○

Kenta WATANABE and Hirofumi SHIMOKAWA

Abstract:
In this study, we used the van-der-Graaf generator type that can easily
generate high voltage. A copper wire is being put from the generator at somedistance. Other end of the wire is being put near metal plate grounded. The
spark discharge was generated between wire and metal plate, when thegenerator operated. The purpose of this study is to clarify the surge
phenomenon that occurs when an object having a high charge potential

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8pD-3
September 8th (Mon.), <15:00-16:30>
Room 3

Influence of nitrogen concentration of atmosphere on
ignitability of powders
Kwangseok CHOI*，Koujirou NISHIMURA***JNIOSH、**TIISAbstract:
As useful method to prevent dust explosions, inerting using nitrogen(N2), which is an incombustible gas, has been used in industries. This paper is areport of the relationship between the minimum ignition energy (MIE) of powders
due to an electrostatic sparks and the minimum oxygen concentration (MOC) for
combustion. In this paper, we have changed the N2 amount in the air in order tocontrol the oxygen concentration. The Hartman vertical-tube apparatus wasused in this study. The control range of the dust concentrations of the MIE
apparatus used in this study is from 0.5 kg/m3 to 1.8 kg/m3. The maximum sparkenergy achieved in this study was 1000 mJ. Six sample powders were used in
the experiment. As a result, the inerting of N2 has an effect on the ignitability ofsample powders as expected. The MIE of all powders used in this study
increased due to the increase in the amount of N2 in the air. We finally suggestthat 84 % (or above) of N2 for inerting affects the prevention of dust explosionsof polymer powders due to electrostatic sparks.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8pD-4
September 8th (Mon.), <15:00-16:30>
Room 3Development of Electrostatic Ground Monitoring Device○

Tomofumi Mogami, Fumiaki Hashimoto, Tomoju Hirota, Teruo Suzuki, Fumio
Yamada, Nobuo Nomura
Kasuga Denki INC

Abstract:
Of the industrial accidents of fires and/or explosions due to electrostatic
discharges, spark discharges are most frequent ignition source. To solve andprevent spark discharges, all the groundings of the conductors need to bechecked. We have developed an electrostatic ground monitoring device. The
electrostatic ground monitoring device mainly has two ground wire connections,pin A which is connected to the ground and pin B which is connected to the LED.
The electrostatic ground monitoring device can be detected in less than theresistance value (below 100 kΩ) defined in static safety guidelines. This
electrostatic ground monitoring device is expected to be very useful and reliablein preventing problems originating from spark discharges.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8pD-5
September 8th (Mon.), <15:00-16:30>
Room 3

Breakdown Characteristics across Micrometer-scale
Surface Gaps under Negative Impulse Voltage
Hiroyuki IWABUCH
Department of Electrical Engineering and Information Systems

Abstract:
With the miniaturization of MEMS devices, the insulation width and theseparation between electrodes in such devices have been accordingly reduced.
Consequently, electrical breakdown phenomenon across micrometer-scale gap
is of great practical interest for insulation designing of miniaturized devices. This
paper reports breakdown phenomenon under negative impulse voltage
application across micrometer-scale surface gaps fabricated on SO wafers.
When applying the negative impulse voltage, the breakdown voltage wasconstant and independent of gap width and electrode material. The result
indicates that the breakdown voltage was strongly affected by the electric
intensity on the cathode: the F-N current by the electric field on the cathode can
induce the breakdown.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

9aB-1
September 9th (Tue.), <10:00-10:45>
Room1

Development of Low-Temperature Sintering Technique for
Plastic Dye-Sensitized Solar Cells
Shungo Zen
The University of Tokyo Department of Advanced Energy

Abstract:
Dye-sensitized solar cell (DSSC) requires sintering of TiO2
photoelectrode at 450~550 C to be manufactured.
However, the high-temperature sintering is disadvantageous because it
limits the use of materials that cannot withstand high temperatures.
In our previous work, we proposed plasma and low-pressure mercury(Hg) lamp ultraviolet (UV) treatments of the TiO2 electrode to reduce thesintering temperature by half. It was concluded that the effect of the surface
treatment is due to reactive oxygen species (O3, O, OH) produced by theplasma and UV light.In this paper, we propose two techniques for TiO2
photoelectrode, there can reduce the sintering temperature from 450 C to 150 C.
We were succeded in manufacturing plastic DSSC at 150-C sintered by using
new techniques.
The conversion efficiency of plastic DSSC was 3.1 %.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

9aB-2
September 9th (Tue.), <10:00-10:45>
Room 1

Production of Platinum Particles on the Surface of Porous
Substrates Using A Few Tens keV Electron Beam Induced
Reduction Method○

Teruyuki HAKODA*, Shunya YAMAMOTO*, Hirofumi ARITANI**, and Masahito
YOSHIKAWA** Japan Atomic Energy Agency ** Saitama Institute of Technology

Abstract:
The production of noble metal catalyst particles on the surface of
catalyst substrates were studied using low energy electron beams (EBs) as aradiation-induced reduction method. Porous alumina substrates were
impregnated in a solution containing PtCl42- ions and ethanol. The surface ofthe substrates was irradiated with EBs. As a result, platinum particles were
produced on the surface of the substrates. The platinum particles had catalytic
activity. The obtained results suggest that low energy EBs can be applied to the
production of noble metal catalysts as new application of a radiation-induced
reduction method.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

9aB-3
September 9th (Tue.), <10:00-10:45>
Room 1

Stabilization method of gold nano-particle on porous
materials using an electrospray microreactor in liquid
Yoshiyuki TERAMOTO
AISTAbstract:
Gold nano-particls were stabilized on porous materials using a novel
method. First, colloidal gold solution was prepared using an electrospraymicroreactor in liquid. Its particle size was around 3 nm regardless of atomizingtime of electrospray. And then, carriers were immersed in the prepared colloidal
gold solution. The forms of supported gold nanoparticles were identified ashemispheres ca.3-5 nm in diameter. Their sizes increased with increasing thecolloid concentration (= atomizing time of electrospray). On the other hand, its
size was hardly affected by the carrier material.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

9aA-1
September 9th (Tue.), <11:00-12:00>
Room 1

Emission Spectroscopic Measurements ofAtmospheric-pressure Non-thermal Plasma Jets
Generated Using Glass- and Alumina- Tubes○

Norimitsu Takamura*，Douyan Wang**，Takao Namihira***，Hidenori
Akiyama***Graduate School of Science and Technology, Kumamoto University,
Japan*Priority Organization for Innovation and Excellence, Kumamoto University,
Japan**Institute of Pulsed Power Science, Kumamoto University,
Japan***

Abstract:
Atmospheric-pressure non-thermal plasma jets (APPJs) have been
widely studied for the processing of a variety of materials and biomedical
applications. In the past, a number of papers related to the APPJs’ emission
spectra have been already reported. However, the emission spectra of the
APPJs generated using different dielectric tubes have not been adequately
investigated and reported yet. In this study, therefore, the emission spectra of
the APPJs generated using glass- and alumina- tubes were measured tocompare how the amount and types of active species changes. In thisexperiment, an observation system using an ICCD camera coupled to aspectrograph was used to measure the emission spectra. The experimental
results show えｄ the amount of active species such as OH＊ (309 nm), N2＊(C3Πu- B3Πg, 337.1 nm), and N2+＊ (B2Σu+ - X2Σg+, 395.1 nm) wereincreased by using alumina tube compared to glass tube. In addition, theexperimental results suggest that there are some different production
mechanisms of active species between using glass- and alumina- tubes.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

9aA-2
September 9th (Tue.), <11:00-12:00>
Room 1

Effect of interval time between pulses on streamer discharge○

Yuta Ishibashi**,Yoshiyuki Teramoto*, Ryo Ono**

School of Engineering, The University of Tokyo National Institute of Advanced
Industrial Science and Technology (AIST)* Graduate School of Frontier
Sciences, The University of Tokyo**

Abstract:
Effect of interval time between pulses on discharge was investigatedusing a double-pulse corona discharge in N2. N2(C) production and dischargeenergy of 2nd pulse discharge decreased with decreasing interval time (∆t),
regardless of same applied voltage. Additionally, breakdown voltage of 2nd
pulse significantly decreased with decreasing ∆t. When ∆t was 20 s,
breakdown voltage of 2nd pulse came down from 6.3 kV to 2.6 kV.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

9aA-3
September 9th (Tue.), <11:00-12:00>
Room 1

Measurement of negative streamer propagation
Hanakawa Wataru
The university of Tokyo

Abstract:
A negative pulsed corona discharge streamer is observed in apoint-to-plane gap using a short-gated intensified CCD camera and a streak-likephotograph. When the applied voltage is low, the streamer propagates as far as
the middle of the gap. It is different characteristics from the positive streamer.
The shape of the streamer head is rounded and thicker than that of the positive
streamer. The streak-like photograph shows that the negative streamer
propagates in three stages: (i) primary streamer, (ii) strong return stroke from thepositive plane to the negative point electrode, and (iii) secondary streamer.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

9aA-4
September 9th (Tue.), <11:00-12:00>
Room 1

Numerical analysis of negative and positive streamer corona
discharge propagations
Daiki Saito
Department of Advanced Energy, The University of Tokyo

Abstract:
We numerically calculate the two-dimensional point-to-plane negativeand positive streamers in a dry-air environment. The calculation has been
performed in the case of a point to plane corona discharge filled with dry air(80% N2, 20% O2) at atmospheric-pressure ambient temperature. The
calculation shows difference between negative and positive streamer
propagations.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

9pC-1
September 9th (Tue.), <14:00-15:00>
Room 1

2-D Concentration Distribution of ROS Supplied on Liquid
Target by Non-thermal Plasma Jet○

Masaki HAMADA, Yasutaka WAKABAYASI, Wataru ETO, Yasuhumi ABE,
Keisuke KIHARA, Miho SAKAI, and Toshiyuki KAWASAKI
Faculty of Engineering, Nippon Bunri University

Abstract:
The distribution of reactive oxygen species (ROS) generated by aplasma jet has been investigated using the chemical reagent prepared in ourlaboratory. This chemical reagent provides the important and special information
which can’t be obtained by other methods. In this paper, the influence of theirradiation distance, supplied gas and water on the 2-D ROS distribution wasstudied using the chemical reagent. Helium (He) gas with or without oxygen (O2)were supplied into the generator. The irradiation distance was changed from 5
mm to 50 mm. The experiment with the water layer on the reagent was also
conducted in order to study the production and transport of ROS through water.
The relative concentration distribution was also obtained by an absorbancemeasurement. The ROS distribution significantly depended on the irradiation
distance in He plasma jet. The high efficiency and local supply of ROS to thetarget can be controlled by the irradiation distance. In the case of O2 (0.5%)/He
mixture gas supply, it is considered that the ROS distribution significantly
influenced by the synergistic effect of long-lived species generated in the plasmaphase. The interesting 2-D distribution patterns were visually obtained in thewater using the reagent underwater.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

9pC-2
September 9th (Tue.), <14:00-15:00>
Room 1

Influence on Plants by Irradiation of Atmospheric-pressure
LF Plasma Jet○

Kei ETO, Daichi OTORI, Shuichi AKAMINE, Ryuta ICHIKI, Seiji KANAZAWA
Department of Electrical and Electronic Engineering, Oita University

Abstract:In
thisstudy,
Arabidopsis
thaliana
was
irradiatedbyatmospheric-pressure low frequency (LF) plasma jet. Here, helium gas was used
as an operating gas. We evaluated the influence of the atmospheric-pressureplasma jet on growth of the plants by measuring the leaf area of Arabidopsis
thaliana and comparing with a control group. We also measured chlorophyll
fluorescence of leaves. As a result, the effect of atmospheric-pressure plasma
jet was different with state and form of plants. The growth stimulation wasobserved for the seeds irradiated by atmospheric pressure-plasma jet after
vernalization. After germination the apoptosis occurred for the leaves irradiatedby the plasma jet. This inactivation was related to the intensity decrease ofchlorophyll fluorescence from the leaves.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

9pC-3
September 9th (Tue.), <14:00-15:00>
Room 1Analysis of Biomolecular Damage and Cellular Responses
Induced by Atmospheric Pressure Plasma Exposure○

Hirofumi KURITA*, Kaori SANO*, Mika SHIMIZU*, Tomoko NAKAJIMA*, Kazue
MIZUNO**, Ryo ONO**, Hachiro YASUDA*, Kazunori TAKASHIMA*, and Akira
MIZUNO**Toyohashi University of Technology, **The University of Tokyo

Abstract:
Recently, non-thermal atmospheric pressure plasma has been studied inbiological and medical applications. Among them, reactive oxygen andnitrogen species (RONS) in aqueous solution injected by the plasma exposure
play an important role. Therefore, we have been trying to use large DNA
molecules as a biomarker to estimate intensity of RONS in the aqueous media.
Here, we report the measurement of OH radical by electron spin resonance(ESR) spectroscopy with spin trapping technique. The correlation between thesignal intensity of OH radical measured by ESR and the number of strand
breaks obtained by single-molecule DNA observation was examined.
Furthermore, cellular responses after plasma exposure in human cell lines werealso studied.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

9pC-4
September 9th (Tue.), <14:00-15:00>
Room 1

DNA Detection using Dynamic Change of Microbeads
Dielectrophoresis with DNA Labeling○

Michihiko Nakano, Zhehnao Ding, Hiromichi Kasahara, Junya Suehiro
Kyushu University

Abstract:
In this paper, a new DNA detection method using dielectrophoresis ofdielectric microbeads is described. This method can detect DNA amplified bypolymerase chain reaction (PCR) rapidly and easily. PCR is used to diagnosebacterial/viral infection as the one of the most sensitive and specific methods.
PCR amplifies DNA for the target pathogens. After PCR, the amplified DNA
should be determined by a method such as an agarose gel electrophoresis. Thistakes a few hours and requires complicated processes. It was found thatdielectrophoresis of the microbeads was dramatically altered by DNA
immobilization on them. The DNA-labeled microbeads were trapped on a
microelectrode by positive dielectrophoresis, whereas the pristine ones wererepelled from the microelectrode. The trapped microbeads were measured byelectrically. This method is faster than a standard DNA detection.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

9aC-1
September 9th (Tue.), <10:00-12:00>
Room 2

Active Fluid Control by Multi-electrode Microplasma
Actuator○

Yoshinori Mizuno*、Marius Blajan**, Hitoki Yoneda***, Kazuo Shimizu*,***Graduate School of Engineering, Shizuoka University, **Organization for
Innovation and Social Collaboration, Shizuoka University, ***Institute for Laser
Science, The University of Electro-Communications

Abstract:
In this study, multi-electrode microplasma actuator for active fluid control
was investigated. Our microplasma electrode could generate plasma by
relatively low voltage less than 1.5 kV due to the μm discharge gap. Such low
voltage is easily controlled by semiconductor switches and small step-up
transformer. This contributes miniaturize the system on parallel operation theelectrodes system. Therefore, more active flow control could be carried out
compared as traditionally plasma actuator. Air flow induced by the atmosphericmicroplasma was measured by the Particle Image Velocimetry (PIV). Incense
smoke sub-micron diameter was used for tracer particles and Nd YVO4 532 nm
laser was utilized to visualize the tracer particles. By applying sinusoidal voltage
1.3 kV, 15 kHz, to the multi-electrode microplasma electrodes, air flow velocity of
0.1~0.6 m/s was obtained and its direction (left, right, up, down) was controlled
without changing the electrode geometry.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

9aC-2
September 9th (Tue.), <10:00-12:00>
Room 2

Selective Production of Radicals Using Vacuum Ultraviolet
Light
Yusuke Tokumitsu
The University of Tokyo

Abstract:
According to the recent studies of plasma medicine, it is expected thatradicals have the therapeutic and sterilization effects. But the reaction
mechanism of the plasma is so complicated that it is difficult to clarify whichradicals are really effective. Therefore, we developed a new device which uses a
vacuum ultraviolet light to selectively produce radicals, and measured thedensities of ozone and OH produced by the device and compared withsimulation results. It was revealed that the device can produce sufficient quantityof radicals.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

9aC-3
September 9th (Tue.), <10:00-12:00>
Room 2

Effect of gas flow rate on treatment of mouse melanoma
cells using a nanosecond streamer discharge
Taketoshi AKIYAMAThe University of Tokyo

Abstract:
Recently it is expected that atmospheric pressure plasma is useful to
induce apoptosis, and plasma is used for cancer treatment. We treated mousemelanoma cells (B16F10) using a nanosecond streamer discharge, andexamine the effect of gas flow rate on the cell survival rate. The effect of water
vapor evaporated from the culture medium that produce radicals such as OH
and H2O2 is discussed.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

9aC-4
September 9th (Tue.), <10:00-12:00>
Room 2

Effect of humidification for the sterilization of
Staphylococcus aureus on the electrode surface by corona
discharge.
○

Takahiro Miura、Akinori Zukeran、Jun Sawai
Kanagawa Institute of Technology

Abstract:
In this paper, it is investigated to sterilize staphylococcus aureus on anelectrode in an electrostatic precipitator (ESP) under high relative humidity
condition. The ESP consisted of a precharger and a collecting unit. The bactrum
was put on the grounded plate electrode surface of the precharger and thecollecting unit, whereby that was sterilized by corona discharge. The relative
humidity was controlled using pure water or tap water.
As a result,
Staphylococcus aureus was sterilized at relative humidity greater than 75%.
However, the bacterium on the upstream side of the electrode in the precharger
was not sterilized. The effect of humidification by pure water was almost sameas that by tap water.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

9aC-5
September 9th (Tue.), <10:00-12:00>
Room 2

biofilm sterilization by mist air discharge○

Ryota SUGANUMA*，Koichi YASUOKA**Faculty of Engineering, Tokyo Institute of Technology

Abstract:
Biofilm that is any group of microorganisms sticks to the wall and floor offood factory, pharmaceutical factory and causes environmental degradation.
Hydrogen peroxide solution, ozone water and advanced oxidation process(AOP) were tested to examine their availability for killing the biofilms of
Pseudomonas aeruginosa. AOP showed higher bactericidal activity than othermethods. Though the hydrogen peroxide can be generated with a dielectricbarrier discharge in mist air, the concentration was found to be too low to remove
the biofilm.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

9aC-6
September 9th (Tue.), <10:00-12:00>
Room 2Inactivation of Airborne Microorganism by Corona Discharge
PlasmaTakanori TANINO, Ataru MIYAZAKI, Takuya FURUHASHI* and ○Takayuki
OHSHIMA
Graduated School of Engineering, Gunma University、*Mitsubishi Electric
Corporation

Abstract:
Inactivation of airborne microorganism by corona discharge wasinvestigated using Staphylococcus epidermidis as the model airborne
microorganism. Significant decrease of airborne S.epidermidis number
compared to that of natural attenuation without corona discharge plasma was
detected. The living cell number of S.epidermidis trapped on grand electrodeplate was almost tithe of decreased airborne S. epidermidis, and thissuccessfully demonstrated inactivation of airborne microorganism by corona
discharge plasma.Several applied voltage waveforms, DC positive, DC negative,
DC superimposed pulse and rectangular wave, were used to generate corona
discharge plasma. In all applied voltage waveforms, airborne S.epidermidis wasinactivated. But the inactivation was depended on consumed energy and there
was no difference between applied voltage waveforms. Damages tomicroorganisms’ cell-surface and genomic DNA by the exposure of corona
discharge were also investigated. Damage to cell-surface was investigatedusing fluorescently labeled yeast.Decrease of fluorescence localized yeast
cell-surface that suggests damage to cell-surface was observed. Damage togenomic DNA was investigated by polymerase chain reaction using S.
epidermidis genomic DNA as the template. The resulted weak band strength of
PCR products using corona discharge plasma exposed S. epidermidis
suggested damage of genomic DNA by corona discharge.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

9aC-7
September 9th (Tue.), <10:00-12:00>
Room 2

Electrification of Slide Glass and fixing of fluorescent beads
on it by AC Corona Discharge○

Tomoko NAKAJIMA*, Jumpei HIGASHIO**, Hachiro YASUDA*, Hirofumi
KURITA*, Kazunori TAKASHIMA* and Akira MIZUNO**Department of Environmentl and Life Science, TUT, **TREK JAPAN Co.Ltd.

Abstract:
With a view to fixing and handling of DNA and viruses for fluorescent
microscopic observation, electrification of microscopic slide glass by AC corona
was studied. In result, negative surface potential appeared on slide glass by ACcorona exposure. The surface potential inversely related distance between
electrode and slide glass; though it appeared at the relatively long distancewithout apparent AC corona, and nearly disappeared at distance shorter thanmost suitable one. Negatively charged fluorescent beads showed coagulation on
the bottom side of AC corona treated slide glass which has positive electric
potential.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

9aD-1
September 9th (Tue.), <10:00-12:00>
Room 3

Effect of the electronegative gas on neutralization
characteristics of a corona-discharge-type ionizer*,Yudi KRISTANTO*,Wanting HE*,Takeshi MATSUO*,Naoyuki SATO*,Kazuo
OKANO**,Takashi IKEHATA**Institute of Applied Beam Science, Ibaraki University **Department of ElectricalEngineering, The Polytechnic University

Abstract:
We investigated the neutralization characteristics of a corona-discharge-type ionizer in different atmospheric gases; ambient air, pure nitrogen, mixed
N2-O2 and N2-SF6 gases with changing the partial pressure of O2 and SF6,
respectively. The product final voltage VPF in pure nitrogen shows a deviation toabout -2 kV. However, by introducing SF6, VPF reduced to the one equivalent toair. The amount of SF6 gas needed to improve the ion balance is many orders ofmagnitude smaller than that of O2 gas.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

9aD-2
September 9th (Tue.), <10:00-12:00>
Room 3Development of the Corona Discharge Air Ionizer Applied
Electrical Field of Charged Surface○

Takashi Sato*,Takashi Ikehata*, Kazuo Okano***Institute of Applied Beam Science, Ibaraki University **Department
Electrical Engineering, The Polytechnic Universityof

Abstract:
This paper proposed a new type of corona discharge air ionizer, applied
electrical field of charged surface to neutralize the object. To achieve that, thecorona discharge air ionizer is operated extremely close to the charged surface.
There's a problem that it may turn the corona discharge air ionizer into anelectrostatic charger. To avoid becoming an electrostatic charger, emitter voltage
operated at lower than conventional the corona discharge air ionizer, which
generates few ions. We experimented characteristics of neutralizing the charged
surface changing factors [Waveform, Voltage, Frequency, Height], reported
comfortable value based on these result2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

9aD-3
September 9th (Tue.), <10:00-12:00>
Room 3The electrode materials and preventing the erosion of themon corona-discharge electrodes of the ionizer for clean
rooms part2○

Masanori SUZUKI*，Tomokatsu SATO*, ***Technical R&D Center, Techno Ryowa Ltd., **Dept. of Environment and Life
sciences, Toyohashi University of Technology

Abstract:
In recent years, static electricity has become a major cause of
production yield loss in LSI or LCD production processes. However it wasserious problem that corona-discharge electrodes of the ionizer for eliminating
static electricity in clean rooms emit fine particles through the erosion caused byion sputtering. In our previous paper, we described the cleanroom use ionizer
prevented the particle generation from its electrodes and we also reported theresult we evaluated our developed electrode prevented the erosion caused byion sputtering. In this paper, we will report the result we evaluated new
erosion-proof electrodes we developed through the long endurance test and themeasurement of metal contamination on the surface of silicon wafers.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

9aD-4
September 9th (Tue.), <10:00-12:00>
Room 3

Bipolar-Type Electrostatic Ionizer used in Pneumatic
Powder Transport Facility
Kwangseok CHOI*、Teruo SUZUKI**、Tomofumi MOGAMI**、
MizukiYAMAGUMA**JNIOSH、**Kasuga Denki INC

Abstract:
As a method to prevent or mitigate explosion due to electrostatic
discharges during the loading of polymer granules in a metal silo, we havedeveloped a novel bipolar-type electrostatic ionizer. In this study, we investigatedexperimentally the practical version of the bipolar electrostatic ionizer with apneumatic powder transport facility. As a sample, 300 kg of polypropylene (PP)
granules 3 mm in size was employed in this study. The specific charge of PP
was clearly decreased by approximately 85 percent with the novel bipolarelectrostatic ionizer. The brush discharges, as well as the incendiary bulk
surface discharges, completely died out inside the silo when using the novel
bipolar electrostatic ionizer.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

9aD-5
September 9th (Tue.), <10:00-12:00>
Room 3

Cause of a Fire that occurred in Polymerization Tank
Hiroyuki TAMURA、Toshiyuki WATARAINational Research Institute of Fire and Disaster

Abstract:
A fire occurred when a worker cleaned the inside of a polymerization
tank, and the worker was injured. Because the toluene was used in the tank, it
was thought that the evaporating toluene had been ignited. The electrostatic
discharge in the tank was doubted as a fire cause. We examined theelectrostatic charge, the electrostatic discharge, and the discharge energy. As aresult, strong electrostatic charge happened by following.- Drawing out a rag
made of cotton for wiping machines from a bag- Washing the rags by rubbing in
the toluene The discharge energy exceeded the minimum ignition energy of thetoluene though it was the electrostatic discharge between ungrounded
conductors such as a metal pail and a human body. It is necessary to take thegrounding of conductors surely on the site in the flammable atmosphere toprevent the electrification and the electrostatic discharge.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

9aD-6
September 9th (Tue.), <10:00-12:00>
Room 3

Analysis current waveforms induced by charged walking
human bodies○

Nakao Kazuki, Nishimura Ryo*Graduate School of Engineering, Tottori University

Abstract:
We aim to construct a non-contact detection system of human walking
motion for personal identification by using variation of charges in walking humanbodies. This system measures very small charge fluctuations caused by walking
as induction currents flowing to a grounded electrode. Fourier analyses werecarried out for the obtained induced current waveforms. Comparing the results of
the Fourier analyses, features of individuals can be detected. We also found thata number of steps a minute gives significant effects on the results of the Fourier
analyses for experiments under the condition of fixed walking pace, walking
velocity and distance between the detection electrode and walking human andthat the difference of apparel gives little difference in the waveforms of Fourier
analyses of induced currents under the same environmental conditions.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

9aD-7
September 9th (Tue.), <10:00-12:00>
Room 3Detection Technique of Electrostatic Induction Current
Generated by Change of Electric Potential of Human Body
in Walking Motion
Koichi Kurita
Kinki University

Abstract:
I here present a method for measuring human physical activity, which isbased on detecting the electrostatic induction current generated by the walking
motion under non-contact and non-attached conditions. A theoretical model forthe electrostatic induction current generated because of a change in the electric
potential of the human body is also proposed. The electric potential of thesubject is determined by integrating the electrostatic induced current. The valuesof the estimated electric potential are qualitatively in good agreement with thoseobtained in conventional experiments by using the ordinary contact-type handelectrode. By comparing the obtained electrostatic induction current with thetheoretical model, it becomes obvious that this model effectively explains the
behavior of the waveform of the electrostatic induction current. The normal
walking motions of daily living are recorded using a portable sensor
measurement located in an ordinary house. The obtained results show thatdetailed information regarding physical activity such as a walking cycle can be
estimated using our proposed technique. This suggests that the proposed
technique, which is based on the detection of the walking signal, can be
successfully applied to the estimation of human physical activity.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

9pD-1
September 9th (Tue.), <14:00-15:00>
Room 3

Experimental study on influence of air applied toelectrostatic field sensor on electrostatic field measurement○

Naoto NOGERA*, Teruo SUZUKI*, Kwangseok CHOI** and Mizuki
YAMAGUMA **○*Kasuga Denki Co., Ltd., **National Institute of Occupational Safety and Health,Japan

Abstract:
Electrostatic charges and/or discharges on powders bring about ignitionand explosion of powders. Electrostatic problems on the powder must be takencare of in the industry. We have developed an electrostatic field sensor whichmeasures electrostatic hazards. The electrostatic field sensor was supplied withcompressed air in order to protect powder particles from getting into the sensor.
This paper is related to how the compressed air affects the performance of theelectrostatic field sensor. As a result, the performance of the electrostatic fieldsensor was affected by the compressed air. Namely, the experimental values
and theoretical values was not the same. That is because movement of thecoppers inside the electrostatic field sensor was disturbed by the compressed air.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

9pD-2
September 9th (Tue.), <14:00-15:00>
Room 3A study on performance of electrostatic filed sensor attachedto loading pipe of pneumatic powder transport facility○

Naoto NOGERA*, Teruo SUZUKI*, Kwangseok CHOI** and Mizuki
YAMAGUMA **○*Kasuga Denki Co., Ltd., **National Institute of Occupational Safety and Health,Japan

Abstract:
have developed an electrostatic field sensor which measureselectrostatic hazards generated from charged powders. This paper is a report on
the performance of the electrostatic field sensor using pneumatic powdertransport facility and 300 kg of polypropylene powder. An electrostatic fieldsensor was attached to the end of the loading pipe inside the silo. As the result,the electrostatic field meter generally performed, as expected. The measured
values obtained from the electrostatic field meter were similar to those whichwere transferred from charge-to-mass ratio, obtained from the Faraday cage
method. However, some data was affected by modification method of theelectrostatic field sensor before use. Several interesting data were also obtainedand discussed.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

9pD-3
September 9th (Tue.), <14:00-15:00>
Room 3Charge neutralisation from the side surface of an insulatingplate
A. Ohsawa
National Institute of Occupational Safety and Health

Abstract:
This work is a response to a comment, ‟Is the charge neutralisation fromthe side surface of a thin insulating object available?”, given at the 14th
International Conference of Electrostatics in Budapest, 17--19 April 2013. We
investigate the phenomena of this charge neutralisation using 2-D
electrohydrodynamic simulations. Results of a preliminary simulation with aninsulating plate of which both the upper and lower surfaces are initially charged
at 1 µC/m^2 are presented in this report2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

9pD-4
September 9th (Tue.), <14:00-15:00>
Room 3

Basics properties of grid type charge control device
Takahisa KIMURA
Yamagata University*． KASUGA DENKI.INC**

Abstract:
To evaluate the state of paint curing quantitatively, we proposed new
paint curing sensor with a grid type charge control device. The device cancharge up the painted material to measure the charging up velocity dependingon the state of paint curing. After the measurements the static charge of thematerial should be eliminated immediately. In this study, we propose charging up
and chare elimination model of the proposed devise. The basic characteristic of
this device was also investigated experimentally. It was found that tendency ofthe experimental results agree with the theory devised from the model.