Decontamination effects of the corona discharge with plane to bent needle configuration
The dependency of the inhibition zone size on the needle geometry and angle between needle and plane in plane to needle electrode configuration was studied. Needles bent at angles from 0° (straight one) to 90° were used to study both negative and positive corona discharge treatment of the surface co...
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України
2012
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| Цитувати: | Decontamination effects of the corona discharge with plane to bent needle configuration / K. Bujaček, V. Fantova, V. Kříha // Вопросы атомной науки и техники. — 2012. — № 6. — С. 187-189. — Бібліогр.: 4 назв. — англ. |
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nasplib_isofts_kiev_ua-123456789-1092112025-02-09T21:23:42Z Decontamination effects of the corona discharge with plane to bent needle configuration Обеззараживающий эффект коронного разряда при конфигурации электродов – изогнутая игла к поверхности Знезаражуючий ефект коронного розряду при конфігурації електродів – зігнута голка до поверхні Bujaček, K. Fantova, V. Kříha, V. Низкотемпературная плазма и плазменные технологии The dependency of the inhibition zone size on the needle geometry and angle between needle and plane in plane to needle electrode configuration was studied. Needles bent at angles from 0° (straight one) to 90° were used to study both negative and positive corona discharge treatment of the surface contaminated with Candida albicans yeasts.Inhibition zones shape and size changes were studied for positive and negative corona discharge. Ellipsoidal shape was characteristic for all treated samples in case of positive corona treatment, while the three-segment shape was observed for higher angles in case of negative corona discharge. Исследовалась зависимость размеров пораженной зоны от геометрии иглы, а так же от угла между иголочным и плоскостным электродами. Иглы согнутые под углами от 0 (прямая игла) до 90 градусов использовались для изучения влияния положительного и отрицательного коронного разряда на поверхность загрязненную дрожжами рода Candida albicans. Эллиптическая форма была характерна для всех образцов обработанных положительным разрядом. В случае использования отрицательной короны, зона состояла из трех сегментов. Это явление можно было особенно ясно наблюдать при использовании больших углов изгиба иголочного электрода. Досліджувалась залежність розмірів ураженої зони від геометрії голки, а також від кута між голковим та площинним електродом. Голки зігнуті під кутами від 0 (пряма голка) до 90 градусів використовувались для вивчення впливу позитивного та негативного коронного розряду на поверхню, забруднену дріжжами роду Candida albicans. Еліптична форма була характерна для всіх зразків, оброблених позитивним розрядом. При використанні від'ємної корони зона складалась з трьох сегментів. Це явище добре спостерігалося під час використання великих кутів вигину голкового електрода. This research has been supported by the Czech Technical University in Prague grant No. SGS10/266/OHK3/3T/13. 2012 Article Decontamination effects of the corona discharge with plane to bent needle configuration / K. Bujaček, V. Fantova, V. Kříha // Вопросы атомной науки и техники. — 2012. — № 6. — С. 187-189. — Бібліогр.: 4 назв. — англ. 1562-6016 PACS: 52.80.Hc, 87.50.C-, 87.19.xg https://nasplib.isofts.kiev.ua/handle/123456789/109211 en Вопросы атомной науки и техники application/pdf Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine |
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Низкотемпературная плазма и плазменные технологии Низкотемпературная плазма и плазменные технологии |
| spellingShingle |
Низкотемпературная плазма и плазменные технологии Низкотемпературная плазма и плазменные технологии Bujaček, K. Fantova, V. Kříha, V. Decontamination effects of the corona discharge with plane to bent needle configuration Вопросы атомной науки и техники |
| description |
The dependency of the inhibition zone size on the needle geometry and angle between needle and plane in plane to needle electrode configuration was studied. Needles bent at angles from 0° (straight one) to 90° were used to study both negative and positive corona discharge treatment of the surface contaminated with Candida albicans yeasts.Inhibition zones shape and size changes were studied for positive and negative corona discharge. Ellipsoidal shape was characteristic for all treated samples in case of positive corona treatment, while the three-segment shape was observed for higher angles in case of negative corona discharge. |
| format |
Article |
| author |
Bujaček, K. Fantova, V. Kříha, V. |
| author_facet |
Bujaček, K. Fantova, V. Kříha, V. |
| author_sort |
Bujaček, K. |
| title |
Decontamination effects of the corona discharge with plane to bent needle configuration |
| title_short |
Decontamination effects of the corona discharge with plane to bent needle configuration |
| title_full |
Decontamination effects of the corona discharge with plane to bent needle configuration |
| title_fullStr |
Decontamination effects of the corona discharge with plane to bent needle configuration |
| title_full_unstemmed |
Decontamination effects of the corona discharge with plane to bent needle configuration |
| title_sort |
decontamination effects of the corona discharge with plane to bent needle configuration |
| publisher |
Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| publishDate |
2012 |
| topic_facet |
Низкотемпературная плазма и плазменные технологии |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/109211 |
| citation_txt |
Decontamination effects of the corona discharge with plane to bent needle configuration / K. Bujaček, V. Fantova, V. Kříha // Вопросы атомной науки и техники. — 2012. — № 6. — С. 187-189. — Бібліогр.: 4 назв. — англ. |
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ISSN 1562-6016. ВАНТ. 2012. №6(82) 187
DECONTAMINATION EFFECTS OF THE CORONA DISCHARGE WITH
PLANE TO BENT NEEDLE CONFIGURATION
K. Bujaček, V. Fantova, V. Kříha
Czech Technical University in Prague, Faculty of Electrical Engineering,
Department of Physics, Technická 2, 166 27 Prague 6, Czech Republic
E‐mail: demchvla@fel.cvut.cz
The dependency of the inhibition zone size on the needle geometry and angle between needle and plane in plane
to needle electrode configuration was studied. Needles bent at angles from 0° (straight one) to 90° were used to
study both negative and positive corona discharge treatment of the surface contaminated with Candida albicans
yeasts.Inhibition zones shape and size changes were studied for positive and negative corona discharge. Ellipsoidal
shape was characteristic for all treated samples in case of positive corona treatment, while the three-segment shape
was observed for higher angles in case of negative corona discharge.
PACS: 52.80.Hc, 87.50.C-, 87.19.xg
INTRODUCTION
Nowadays well known decontamination effects [1],
wound care and tissue treatment capabilities [2, 3] of
low temperature plasma leads to study properties of
many different decontamination techniques and devices.
It is important to develop easy to use devices with the
rapid decontamination effect and with large treated area.
Despite the fact that there are many articles about
the atmospheric pressure nonthermal plasma (apNTP)
decontamination, the exact decontamination
mechanisms have not been precisely determined yet.
The main decontamination agents are nitrogen and
oxygen reactive species, charged particles, radicals,
ozone, UV radiation. [1] However, contribution of the
UV radiation is uncertain [4].
In this experiment dependency of inhibition zone
size on the needle geometry, particularly on the needle
bent angle, was studied. Simple point-to-plane electrode
configuration device was used. The point electrode was
realized by a bent needle. The plane one was an agar
surface contaminated by Candida albicans yeasts.
1. EXPERIMENT
APPARATUS
A simple apparatus with a bent needle and the plane
electrode as apNTP source was used. Point electrode
was created by bending an ordinary intramuscular
needle of 0.6 mm diameter. The plane electrode was
realized by ion conducting cultivation medium
(Sabouraud agar) in a Petri dish connected to electric
circuit by copper stripe.
DC high voltage power supply (UTES HT 2103)
with maximal voltage 10 kV was used. Ammeter and
voltmeter were integrated parts of the power supply. A
ballast resistor (10 MΩ) was used to limit current in the
electric circuit. Experimental setup and electric circuit is
depicted in Fig. 1.
The dependency of inhibition zone size and its
spatial arrangement on bent angle of needle-shaped
electrode was studied. Unbent needle, used as a
reference was placed perpendicularly to the agar
surface. Needle bent angles 30, 45, 60, 80 and 90° were
chosen (Fig. 1). Time limit for each exposition was set
to 10 min. The distance between plane and point
electrodes was set to 7±2 mm to keep current at constant
value of Imean = 100 µA.
Fig. 1: Experimental setup – point-to-plane electrode
configuration. Bending point x and needle tip y is
projected to x' and y' point respectively
TREATED SAMPLES
To examine decontamination properties of apNTP
Candida albicans yeasts were used. Initial solution was
diluted (106 CFU/cm2) in sterile water with ratios 1:100
and 1:1000 and spread onto cultivation medium. As
soon as the agar surface got dry it was treated by
discharge with unique polarity and bent angle. The
samples were analyzed after overnight cultivation in
thermostatic chamber at 37 °C.
Fig. 2: Negative (left) and positive (right) corona
discharge. The parasite discharge at the elbow for 90°
bent needle (left) and discharge at the needle edges
for 80° bent needle (right)
DISCHARGE
The shape of visible discharge channel was changed
by the needle geometry. The bell shape was typically
formed in case of negative corona discharge, however
the curved thin channel was observed in case of positive
one. The parasite discharges at the needle elbow or
188 ISSN 1562-6016. ВАНТ. 2012. №6(82)
edges could appear for large angles (Fig. 2). This effect
was caused by the shorter distance between secondary
ionization area and plane electrode surface in
comparison to dominant one.
2. RESULTS
NEGATIVE CORONA
The area with visibly inactivated yeasts had a specific
shape, that could be divided into three regions (Fig. 3).
The inferior zone was the region under the needle and
was decontaminated by invisible discharge over the
whole needle length. The main inhibition zone was
discovered under the needle tip. It was caused by the
dominant discharge channel. The last one (the front
zone) appeared for some angles in front of the main
discharge zone. The decontamination of this region was
probably caused by discharge products similarly as in
case of indirect plasma treatment.
Fig. 3: The area, decontaminated by negative corona
discharge with 80° needle-electrode bent angle.
lA– length of inferior zone, SB – main inhibition area,
lC – length of front zone.
The shape of decontaminated area highly depended
on a needle bent angle (see Fig. 4). The main inhibition
zone seemed to be ellipsoidal for all needle-electrodes,
but the inferior area (A) appeared only for angles 45°
and higher.
The circular shape of total inhibition zone was
appeared up to 30° angle. The inferior zone was
undetectable for 30° and 45° needle bent angles, but
started to be clearly visible for 60° and was maximal for
90° (see Fig. 4, blue line). The front zone started to be
detectible for 45° and it was maximal for 60°.
Fig. 4: Dependency of zones parameters on needle bent
angle. lA, SB and lC stands for inferior, main and front
inhibition zone respectively. ST means the total
decontaminated area.
Fig. 5. Shapes of inhibition zones for negative corona
discharge treatment for 80° (left) and 90° (right) angle.
POSITIVE CORONA
The positive corona discharge treatment created an area,
that was eminently different compared to negative
corona treatment. The inhibition zone was approximated
by ellipse for evaluation. Ellipsoidal shape of the main
inhibition zone was observed even for the unbent
needle.
Fig. 6: Dependency of decontaminated area and eccen-
tricity on needle bent angle for positive corona
discharge.
Decontamination zone (expanding in front of the needle
tip) increased with the needle bent angle (see Fig. 6). No
inferior region was observed.
Fig. 7: The dependency of shape and size of inhibition
zone on the needle bent angle for positive corona
discharge (30°, 60° and 80°).
lA
SB
x' y' lC
ISSN 1562-6016. ВАНТ. 2012. №6(82) 189
The parasite discharge effect was observed in 80° and
90° cases (see Fig. 7), when the high bent angle made
the needle tip to be further from agar surface then the
needle edges. These discharges treated a small circle
area, that was not linked to the main inhibition zone (see
Fig. 7, right).
The current of positive corona discharge was hard to
stabilize for constant value of 100 μA due to
deformation of agar surface by ionic wind.
CONCLUSIONS
The simple change of electrode geometry affected
strong increase of the growth inhibition zone.
The area decontaminated by negative corona discharge
could be divided into parts according to physical
parameters of discharge. The positive corona
decontaminated area was ellipsoidal for all treated
samples. This geometry could be used to study indirect
effect of corona discharge treatment.
Total area decontaminated by negative corona discharge
maximum was observed for the needle bent 60° angle.
The front decontaminated zone got its maximum at the
same angle. The main inhibition zone right under the
needle tip decreased with increasing angle.
Positive corona treatment caused increasing of the total
decontaminated area while the radius ratio stayed at the
same level.
ACKNOWLEDGEMENTS
This research has been supported by the Czech
Technical University in Prague grant No.
SGS10/266/OHK3/3T/13.
REFERENCES
1. M. Laroussi. Low Temperature Plasma-Based Sterili-
zation // Overview and State-of-the-Ar. Plasma
Processes and Polymers. 2005, v. 2, p. 391.
2. G. Lloyd, G. Friedman, et al. Gas Plasma: Medical
Uses and Developments in Wound Care // Plasma Proc-
esses and Polymers. 2010, v. 7, p. 194.
3. G. Fridman, A. Gutsol et al. Applied Plasma Medici-
ne // Plasma Processes and Polymers. 2008, v. 5(6),
p. 503.
4. T. Shimizu, T. Nosenko, et al. Characterization of
Low-Temperature Microwave Plasma Treatment With
and Without UV Light for Disinfection // Plasma Proc-
esses and Polymers. 2010, 7, p. 288.
Article received 22.09.12
ОБЕЗЗАРАЖИВАЮЩИЙ ЭФФЕКТ КОРОННОГО РАЗРЯДА
ПРИ КОНФИГУРАЦИИ ЭЛЕКТРОДОВ – ИЗОГНУТАЯ ИГЛА К ПОВЕРХНОСТИ
K. Bujaček, V. Fantova, V. Kříha
Исследовалась зависимость размеров пораженной зоны от геометрии иглы, а так же от угла между
иголочным и плоскостным электродами. Иглы согнутые под углами от 0 (прямая игла) до 90 градусов
использовались для изучения влияния положительного и отрицательного коронного разряда на поверхность
загрязненную дрожжами рода Candida albicans. Эллиптическая форма была характерна для всех образцов
обработанных положительным разрядом. В случае использования отрицательной короны, зона состояла из
трех сегментов. Это явление можно было особенно ясно наблюдать при использовании больших углов
изгиба иголочного электрода.
ЗНЕЗАРАЖУЮЧИЙ ЕФЕКТ КОРОННОГО РОЗРЯДУ
ПРИ КОНФІГУРАЦІЇ ЕЛЕКТРОДІВ – ЗІГНУТА ГОЛКА ДО ПОВЕРХНІ
K. Bujaček, V. Fantova, V. Kříha
Досліджувалась залежність розмірів ураженої зони від геометрії голки, а також від кута між голковим та
площинним електродом. Голки зігнуті під кутами від 0 (пряма голка) до 90 градусів використовувались для
вивчення впливу позитивного та негативного коронного розряду на поверхню, забруднену дріжжами роду
Candida albicans. Еліптична форма була характерна для всіх зразків, оброблених позитивним розрядом. При
використанні від'ємної корони зона складалась з трьох сегментів. Це явище добре спостерігалося під час
використання великих кутів вигину голкового електрода.
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