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Sains Malaysiana 45(11)(2016): 1689–1696
Generation, Characterization and
Application of Atmospheric Pressure Plasma Jet (Penjanaan, Pencirian dan Aplikasi
Jet Plasma Bertekanan Atmosfera) R. SHRESTHA1,2,
D.P.
SUBEDI1,
J.P.
GURUNG1
& C.S. WONG3* 1Department of Natural
Science, Kathmandu University, Dhulikhel,
Nepal 2Department of Physics,
Nepal Banepa Polytechnic College, Banepa, Kavre, Nepal 3Plasma Technology
Research Centre, Physics Department, University of Malaya 50603 Kuala Lumpur,
Federal Territory, Malaysia Received: 1 June
2015/Accepted: 29 March 2016 ABSTRACT The development of a non-thermal
plasma jet with a capillary configuration working at atmospheric
pressure is reported in this paper. The plasma jet is powered
by a power source with frequency of several kilohertz. The working
gas is argon. The plasma obtained has been characterized by optical
emission spectroscopic measurements and electrical measurements
of the discharge using voltage and current probes. The electron
temperature has been estimated by using the modified Boltzmann
plot method utilizing the Ar 4p-4s transition.
The electron temperatures at various positions along the plasma
jet length have been obtained and it is found that the electron
temperature decreases at position further from orifice. The electron
density has been estimated from current and voltage measurements
using the power balance method. The effects of gas flow rate,
applied voltage and frequency on the characteristics of the plasma
jet have also been investigated. The applications of the atmospheric
pressure plasma jet (APPJ) developed to modify the surface
properties of Polyethyleneterephthalate
(PET)
and polycarbonate (PC) have been tested. Our
results showed that the atmospheric pressure non-thermal plasma
jet can be effectively used to enhance the surface wettability
and surface energy of the PET
and PC.
The plasma jet has also been tested for inactivation of prokaryotic
cells (Escherichia coli, Staphylococcus aureus). In
the case of E. coli, better than 4 log10 reduction
can be achieved. The effect of plasma jet on the pH of
cell culture medium has suggested that the plasma species, particularly
the electrons, are solely responsible for the effect of inactivation
of living cells. Keywords: Electron density;
electron temperature; optical emission spectroscopy; plasma jet ABSTRAK Kertas ini membincangkan pembangunan jet plasma bukan terma yang mempunyai konfigurasi kapilari dan beroperasi dengan tekanan atmosfera. Jet plasma ini
dikuasakan oleh
suatu sumber kuasa
berfrekuensi beberapa
kilohertz. Gas yang digunakan
adalah argon. Plasma
yang dihasilkan telah dicirikan dengan menggunakan ukuran spektroskopi pancaran optik dan elektrik
dengan menggunakan
penduga voltan dan arus. Suhu elektron telah
dianggarkan dengan
kaedah ubah suai
plot Boltzmann yang menggunakan peralihan
Ar 4p-4s. Suhu
elektron pada beberapa
kedudukan di sepanjang
jet plasma telah diambil
dan suhu elektron
didapati berkurang
pada kedudukan yang lebih jauh dari
orifis. Ketumpatan elektron telah
dianggarkan daripada
ukuran arus voltan
menggunakan kaedah
kuasa imbangan. Kesan kadar
aliran gas, voltan
yang digunakan serta ciri jet plasma juga telah dikaji. Aplikasi jet plasma bertekanan atmosfera (APPJ)
yang dibangunkan untuk
mengubah ciri permukaan
polietilenatereftalat (PET)
dan polikarbonat (PC)
telah diuji. Keputusan
menunjukkan bahawa
jet plasma bertekanan atmosfera
bukan terma
boleh digunakan dengan berkesan untuk meningkatkan kebolehbasahan permukaan dan tenaga permukaan
PET
dan PC.
Jet plasma ini juga telah
diuji untuk
pentakaktifan sel prokariot (Escherichia coli,
Staphylococcus aureus). Untuk E.
coli, pengurangan melebihi
4 log10 boleh dicapai.
Kesan jet plasma kepada
nilai pH medium sel kultur telah
mencadangkan bahawa
spesies plasma, terutamanya elektron, bertanggungjawab sepenuhnya untuk kesan pentakaktifan sel hidup. Kata kunci: Jet plasma; ketumpatan elektron; spektroskopi pancaran optik; suhu electron REFERENCES Bekeschus, S., Masur,
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