2015 Annual Meeting of The Institute of Electrostatics JapanTokyo Metropolitan University
September 24-25, 201525aA-1
September 25th (Fri.), <10:00-10:45>
Room 1Minimally-Invasive Electrically-induced Bubble Injector for
Patterning to Variety of Biological Materials
Kazuki Takahashi,Yoko Yamanishi
Shibaura Institute of Technology，JST PRESTO

Abstract:
We have successfully developed minimally-invasive bubble injector
which is applicable for variety of biological materials with various hardness. The
novelty is that the minimally-invasiveness of injection whose resolution is in therange of 10 - 200 μm, and hence cellular-scale injection and two-dimensional
patterning injection can be fulfilled. The novelty of the present techniques are (1)unique perforation techniques by means of cavitation phenomena using
high-speed bubbles cavitation, (2) powerful but minimally invasive precise
perforation to wide range of biological materials, (3) high versatility thatbubble-injector can be used under water and in the air. The developed injector
can be used for wide range of biomedical study, especially in gene engineering.
This technique has advantages over the conventional electroporation or
ultrasound operation in terms of localization of injection and ability oftransportation of material.

2015 Annual Meeting of The Institute of Electrostatics JapanTokyo Metropolitan University
September 24-25, 201525aA-2
September 25th (Fri.), <10:00-10:45>
Room 1

A Study of Mechanism of High Piezoelectric Performance
Poly (lactic acid) Film Manufactured by Solid-StateExtrusion〇Mitsunobu Yoshida*,**, Yoshiro Tajitsu**○*Mitsui Chemicals Inc., **Graduate School of Engineering, Kansai University

Abstract:
A piezoelectric film of poly (L-lactic acid) (PLLA) has no pyroelectricity
and has a high voltage output coefficient g; thus, recently, it has become a key
material for realizing pressure sensors with high sensitivity.
For realizing small sensors with high sensitivity, the piezoelectricperformance of PLLA films should be improved. Previously, we investigatedsolid-state extrusion (SSE) to improve the piezoelectric performance of poly
(D-lactic acid) (PDLA), which showed that piezoelectric constant d14 reached18.9 pCN-1. In this paper, we conducted quantitative crystal structural analysis
by X-ray diffraction (XRD) and geometric structural analysis of a helical chiralpolymer to investigate the mechanism of the high piezoelectric performance ofSSE films.

2015 Annual Meeting of The Institute of Electrostatics JapanTokyo Metropolitan University
September 24-25, 2015

25aA-3September 25th (Fri.), <10:00-10:45>
Room 1

Fundamental characteristics of discharge in the short gap
length using theCockcroft-Walton circuit
Yuma SANO
Department of Mechanical and Electrical Engineering, Nippon Bunri University

Abstract:
We were using a battery to power in this study. We have to control thevoltage by the switch. And the positive DC voltage is applied to the needleelectrodes in the Cockcroft-Walton circuit through the DC-AC inverter. The
experiment of the basic properties of corona discharge in the closed-type
needle-to-plane electrode system reactor we went.
Atmospheric pressure non-thermal equilibrium plasma is utilized in theremoval of air pollutants. The Cockcroft-Walton circuit is used in the accelerator.
It was applied to the needle electrode by raising the voltage at theCockcroft-Walton circuit. It was discharged in a dark room. Bluish white light wasgenerated at the tip of the needle electrode If you confirm with the naked eye.
DC discharge current pulsations appear to be affected by the DC-AC inverter. It
is measured by the oscilloscope.

2015 Annual Meeting of The Institute of Electrostatics JapanTokyo Metropolitan University
September 24-25, 2015

25aB-1
September 25th (Fri.), <11:00-12:00>
Room 1

Low ozone emission characteristics ofa carbon brush ionizer
Hak-Joon Kim, Bangwoo Han, Chang-Gyu Woo, Yong-Jin Kim
Korea Institute of Machinery and Materials (KIMM)

Abstract:
The concentration of ozone produced as a by-product of ESP usage wasmeasured by changing the voltage to an ionizer with thin carbon fiber brushes,
and it was compared to those from general ionizers which were made of different
materials for high voltage electrode or were made of carbon electrodes withdifferent diameters and numbers. This was done in order to understand thereason why carbon brush ionizer emits low ozone, which has not been
researched until now. The experimental results showed that the low ozone
emission from a carbon brush ionizer was possible not by material but by
sharpness of the high voltage electrode and by multi electrode effect.

2015 Annual Meeting of The Institute of Electrostatics JapanTokyo Metropolitan University
September 24-25, 2015

25aB-2September 25th (Fri.), <11:00-12:00>
Room 1

Hak-Joon Kim, Bangwoo Han, Chang-Gyu Woo, Yong-Jin Kim
Korea Institute of Machinery and Materials (KIMM)

Abstract:
A novel two-stage ESP for IT manufacturing industries was developedthat uses indirect type carbon brush charger which is located outside of a maingas flow duct to achieve perfect separation from contact of polluted gases, andimposes additional electric field between upper and bottom plates of thecharging stage to enhance collisions between ions and particles thus increase
particle charges. The performance of the ESP was evaluated experimentally for
ultrafine particles with a mean diameter of 100 nm based on number by varying
the voltages for chargers and for additional electric field imposing, and numberof the chargers. The total air flow rate for the test were approximate 110 L/min
with 10 : 1 ratio of main and mixing flows in the ESP, and applied voltages forchargers and additional electric field were from -10 to -22 kV, and from -5 to -10
kV, respectively. Collection efficiencies in the ESP were linearly proportional toincrease in number of chargers and applied voltage to chargers, while thosewere inversely proportional to increase in applied voltage for additional electricfield. The collection efficiency of the ESP was reached to over 90% based on
total particle number at the applied voltage to triple chargers of -15 kV andadditional electric field between upper and bottom plates in charging stage of -6
kV/ 100 mm

2015 Annual Meeting of The Institute of Electrostatics JapanTokyo Metropolitan University
September 24-25, 201525aB-3
September 25th (Fri.), <11:00-12:00>
Room 1

Study on influence of exhaust gas temperature in theelectrostatic precipitator〇Mitsuhiro Takasaki, Hirofumi Kurita, Kazunori Takashima and Akira Mizuno
Dept. of Environmental and Life Sciences, Toyohashi University of Technology

Abstract:
A diesel engine is one of the most fuel efficient engines and expected tosave energy even it is necessary to remove particulate matter (PM) contained in
the exhaust gas. Diesel particulate filter (DPF) has been established as a key
technology in reducing diesel PM, however, technological improvements topressure drop is still required.
Therefore, we focused on an electrostatic precipitation by taking
advantage of its small pressure drop and efficient collection of nano-sizedparticles. However, one of the problems with an electrostatic precipitator (ESP)
is abnormal dust re-entrainment. To cope with this problem, we studied the effectof gas temperature and surface roughness of collecting electrode onelectrostatic precipitation of diesel PM. As a result, lower gas temperature
showed stable collection and high collection efficiency of particles. In addition,
varying the surface roughness of collecting electrode was effective for improving
the collection efficiency by installing a mesh on it.

2015 Annual Meeting of The Institute of Electrostatics JapanTokyo Metropolitan University
September 24-25, 201525aB-4
September 25th (Fri.), <11:00-12:00>
Room 1

Water purification using a packed bed reactor with pulsed
electric field○Yudai TAKEDA, Yuki TAINO, Hirofumi KURITA, Hachiro YASUDA, Kazunori
TAKASHIMA and Akira MIZUNO
Dept. of Environmental and Life Sciences, Toyohashi University of Technology

Abstract:
In previous study, we have developed a novel water treatment techniqueto remove and inactivate bacteria such as Escherichia coli (E. coli) utilizing
dielectrophoresis (DEP) induced by pulsed high voltage application. The result
showed that E. coli was successfully trapped by DEP force and at the same time,
inactivated by pulsed electric field (PEF). However, the effect of electricalproperties of sample water on the collection and sterilization characteristics was
not studied. In this study, influence of the conductivity of the samples on thecollection and sterilization of E. coli was investigated. The conductivity of thesamples was adjusted by NaCl and mannitol addition as well as bacteriaconcentration. As a result, removal and inactivation rate of E. coli decreased with
conductivity of the sample. But around 50% inactivation rate was observed evenfor highly conductive sample.
Comparison between E. coli and PS beads having nearly the same size
showed that E. coli was collected much more effectively than PS beads probably
because of its agglomerative nature. High inactivation efficiency by PEF can be
resulted from the agglomeration on the pellet surface, through which it is more
likely for the cell membrane to be broken when the pulsed electrostatic field isinduced.