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Sains Malaysiana 46(5)(2017): 783–793 http://dx.doi.org/10.17576/jsm-2017-4605-13
Low Pressure
DC-Plasma System for the Modification of Polymeric Membrane Surfaces (Sistem
DC-Plasma Tekanan Rendah untuk Pengubahsuaian
Permukaan Membran Polimer) CHALAD YUENYAO1,2,3*,
THAWAT
CHITTRAKARN1,2,
YUTTHANA
TIRAWANICHAKUL1,2
& HIDEKI NAKAJIMA4 1Department of Physics,
Faculty of Science, Prince of Songkla University, Hatyai, Songkhla
90112 Thailand 2Membrane
Science and Technology Research Center, Department of Physics, Faculty
of Science Prince
of Songkla University, Hatyai, Songkhla 90112, Thailand 3ThEP
Center, CHE, 328 Si Ayutthaya Rd., Bangkok 10400, Thailand 4Synchrotron
Light Research Institute (Public Organization), 111 University Avenue,
Muang District, Nakhon Ratchasima 30000, Thailand Diserahkan:
27 Jun 2016/Diterima: 24 Oktober 2016 ABSTRACT The main objectives of this work were to develop a lab-scale direct
current (DC) glow discharges plasma system for
modification of organic and inorganic membranes. Characteristics
of plasma system were presented under the discharge of five gases
(Ar, N2,
air, O2, and CO2).
A Langmuir double probe was used for the evaluation of the electron
temperature (Te) and electron density (ne) of
plasmas. The current and voltage (I-V) characteristic curves were
analyzed. Relationships between breakdown voltage (VB) of
gases and products of gas pressure and inter-electrode gap (pd)
were studied in form of Paschen curves. The results showed that
Te of
plasma in various gases was in the range of 4-13 eV, while the ne varied
between 108 and 109 cm-3.
The plasma generated at different gas pressure and applied voltage
is in the normal and abnormal modes. Finally, the constructed DC-plasma
system was utilized for modification of polymeric membrane surfaces.
Treatment time, discharge power and type of gas were varied. The
tailoring of membrane surfaces was analyzed through the water contact
angle and percent-weight loss (PWL)
measurements, DMTA, AFM, XPS and
FTIR
spectrum. It could be shown that DC-plasma
from this system can be used to modify the surface of polymeric
membranes. Keywords: Breakdown voltage; characterization; DC discharge
plasma; Langmuir double probe; polymeric membrane ABSTRAK Objektif utama kajian ini adalah untuk membangunkan satu skala makmal
arus terus (DC) cahaya buangan sistem plasma untuk
pengubahsuaian membran organik dan bukan organik. Pencirian sistem
plasma telah ditunjukkan dengan penyingkiran lima gas (Ar, N2,
udara, O2 dan CO2).
Prob berganda Langmuir digunakan untuk menilai suhu elektron (Te)
dan ketumpatan elektron (ne) plasma. Pencirian arus
dan voltan (I-V) lengkung dianalisis. Hubungan antara gas pembelah
voltan (VB)
dan produk tekanan gas serta jurang antara elektrod (pd) telah dikaji
dalam bentuk lengkung Paschen. Keputusan menunjukkan bahawa Te plasma
dalam pelbagai gas adalah dalam lingkungan 4-13 eV, manakala ne berjulat
antara 108 dan 109 cm-3.
Plasma yang dihasilkan pada tekanan gas yang berbeza dan voltan
gunaan adalah dalam mod normal dan tidak normal. Kesimpulannya,
sistem DC-plasma
yang dibina digunakan untuk pengubahsuaian permukaan membran polimer.
Masa rawatan, kuasa pelepasan dan jenis gas telah berubah. Pengukuran
permukaan membran dianalisis melalui sudut sentuh air dan pengukuran
kehilangan peratus berat (PWL),
spektrum DMTA, AFM, XPS dan
FTIR.
Ia dapat ditunjukkan bahawa DC-plasma daripada sistem ini
boleh digunakan untuk mengubah suai permukaan membran polimer. Kata kunci: Membran polimer; pecahan voltan; pencirian; penyingkiran DC plasma;
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