• Title/Summary/Keyword: 글로우방전

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Influences of the electrode surface states on the spark voltage in gas discharges (기체방전에서 불꽃파괴전압에 미치는 전극표면상태의 영향)

  • 백용현;이복희;전덕규;조성욱;서국철
    • Electrical & Electronic Materials
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    • v.4 no.1
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    • pp.65-72
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    • 1991
  • 본 논문은 전극의 표면상태가 기체방전의 전리성장과 특성에 미치는 영향에 관한 것으로 질소-산소 혼합가스중의 순수전극과 오손전극의 상태에서 전압-전류 특성과 글로우방전 개시전압을 측정하였다. 순수전극의 경우, 압력과 전극간의 거리의 곱이 8(Torr-cm)이하이고 산소의 혼입량이 0.005(%)이하일 때의 전리성장은 암류로부터 안정타운젠트방전을 거쳐 글로우방전으로 이행되었으며 글로우방전 개시전압은 거의 일정하였다. 동일의 전극표면상태에서 조차 방전개시전압은 산소혼입비에 의존하며 방전횟수에 따른 이의 변화는 산소의 함량이 0.1(%)부근에서 크게 나타났다. 방전횟수와 산소혼입량의 증가에 따른 방전개시전압의 상승은 주로 전극표면에서의 산소흡착층의 형성과 부착작용에 의한 NO, $O_{2}$, NO$_{2}$, $O_{3}$와 간은 부이온의 생성에 기인된 것으로 여겨진다.

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Poly-tetrafluoro-ethylene와 polyethylene 튜브 내부에 형성된 유전체 장벽 방전의 전류-전압 특성에 대한 연구

  • Jo, Yong-Gi;Choe, Yu-Ri
    • Proceedings of the Korean Vacuum Society Conference
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    • 2016.02a
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    • pp.331.1-331.1
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    • 2016
  • 내부지름이 2.0 mm 이하인 PTFE와 PE 튜브에 진공장치를 이용하여 튜브 내부의 압력을 감압하여 진공상태를 형성하였다. 진공기밀 후에 반응성 가스를 인입하여 튜브 외부에 장착된 전극을 통하여 고전압의 AC 전압을 인가하여 튜브 내부에 선택적으로 유전체 장벽 방전을 유도하였다. 본 연구에서는 유전율이 3.0 이하로 낮은 PTFE와 PE 튜브에 유전체 장벽방전이 유도될 때 나타나는 전압과 전류의 파형을 분석하여 방전의 개시와 방전의 형태를 조사하였다. 주파수 40 kHz인 AC 전원(PEII, Advanced Energy)과 Loadmatch 모듈을 이용하여 4 kV 이하의 전압을 인가하여 플라즈마 방전 유도하였다. 튜브에 인가고전압 프로브와 전류 프로브를 이용하여 오실로스코프를 I-V 분석을 실시하였고, 실험 결과 대기압 방전에서 유도되는 유전체 장벽방전의 I-V 특성과 달리 방전의 형태가 유전체장벽방전과 글로우방전이 혼합된 형태로 나타났다. 또한 유전체 장벽방전을 통해 튜브 내부에 형성되는 플라즈마에 대한 분석으로 OES 광분석을 실시하여, 방전 시간과 전압 변화에 따른 고분자 표면으로부터 방출되는 활성종에 대한 분석을 실시하였다.

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Degradation of Fucoidan by Contact Glow Discharge Electrolysis Using Organic Electrolyte (유기산전해질을 이용한 접촉 글로우 방전 전기분해공정에서 후코이단의 저분자화)

  • Cha, Seong-Han;Lee, Jung-Shik;Kim, Young-Suk;Park, Kwon-Pil
    • Korean Chemical Engineering Research
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    • v.49 no.6
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    • pp.704-709
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    • 2011
  • Depolymerization of fucoidan induced by contact glow discharge electrolysis(CGDE) was investigated. To utilize fucoidan as a functional food material after CGDE, organic acids were used as a electrolyte in CGDE process. Experimental results showed that CGDE using organic acid reduced the molecular weight of fucoidan effectively. As electrolyte concentration increased, onset voltage of glow discharge decreased and onset current of glow discharge increased. From the variation of molecular weight of fucoidan with the reaction time, it was demonstrated that the degradation of fucoidan followed a first-order rate law. Molecular weight of fucoidan treated with CGDE using organic acid was about 77 times lower compared to initial fucoidan with little free sulfate.

Analysis of multi-layered Surface with Glow Discharge-Mass Spectrometry (글로우방전 질량분석법을 이용한 다층박막의 표면 분석)

  • Pak, Yong-Nam;Lee, Gae-Ho;Kim, Hyo Jin
    • Analytical Science and Technology
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    • v.10 no.5
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    • pp.357-361
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    • 1997
  • A Griemm type Glow Discharge cell is attached to a commercial quadrapole based ICP-MS and used for the analysis of surface analysis. By employing 2.0mm diameter, mode and proper experimental conditions, several layers of few ${\mu}m$ thickness are analysed within 30 minutes. Multi-layers of Cu-Ni, Fe-Ni are analyzed with the resolution of 10nm by GDMS. Proper experimental conditions make a flat bottom crater shape and good resolution for multi-layer depth profile study.

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Water Repellent Finish of Polyester Fabric Using Glow Discharge Treatment (글로우방전을 이용한 폴리에스테르 직물의 투습방수성 개질)

  • 김태년
    • Journal of the Korean Society of Clothing and Textiles
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    • v.25 no.1
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    • pp.154-161
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    • 2001
  • We have treated polyester fabric with $CF_4,\;C_2F_6,\;SF_6\;and\;C_3F_6$ glow discharge plasmas to develop functional fabrics which preserve moisture transportation and water proofing nature. Modified properties were evaluated by water vapor permeation rate and breakthrough water pressure. The change of surface morphology was observed by SEM. Fiber interstice of the plasma treated fabric was calculated as $0.32{\mu}{\textrm}{m}$, and this value was sufficiently ideal as water repellent material. The moisture transportation of ${CF_4}-treated$ fabric was good as much as untreated fabric, and those of $C_2$F(sub)6-treated, SF(sub)6-treated fabrics were reduced by 1~3%, and that of ${C_3F_6}-treated$ fabric was reduced by 15%. The best treatment condition were 0.06 torr 120 seconds in $CF_4$, 0.05 torr 30 seconds in $SF_6$, 0.08~0.15 torr 90 seconds in $SF_6$ and 0.1 torr 45 seconds in $C_3F_6$ respectively. The grade of moisture transportation effect was $CF_4>C_2F_6>SF_6>>C_3F_6$, and water proofing effect was $C_2F_6{\approx}CF_4>C_3F_6>SF_6$. It was observed by SEM that the thin film was formed on the surface of the treated substrate by the fluorocarbon plasma treatment.

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Direct analysis of steels with a gas-jet assisted glow discharge lamp for atomic absorption spectrometry (글로우방전을 이용한 철강시료의 직접분석법에 관한 연구)

  • Kim, Hyo Jin;Woo, Jin Chun;Lim, Heoung Bin;Moon, Dae Won;Lee, Kwang Woo
    • Analytical Science and Technology
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    • v.5 no.2
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    • pp.185-190
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    • 1992
  • A gas-jet assisted glow discharge lamp was attached to a conventional atomic absorption spectrophotometer in the place of a flame burner. To evaluate the accuracy of this method, the certified values and the analyzed values of SRM's were compared and atomic absorption sensitivity for five elements were also obtained. Factors affecting the sensitivity and areas for future improvement are discussed.

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Design and Optimization of Glow Discharge Atomic Absorption Spectrometry System (글로우방전 원자흡수시스템의 구성 및 최적화에 관한 연구)

  • Kim, Hyo Jin;Jang, Hye Jin;Lee, Gae Ho;Jo, Jeong Hwan
    • Journal of the Korean Chemical Society
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    • v.38 no.3
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    • pp.214-220
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    • 1994
  • A glow discharge atomic absorption system for the direct analysis of conducting solid samples has been designed and constructed. An arrestor made of machinable ceramic which is a main component for confining the discharge between cathode and anode is modified to have a better stability in discharge. Discharge voltage or current, shape of arrestor, pressure, and gas flow rate can be controlled by an ADC/DAC board with a personal computer. The effect of discharge parameters such as discharge voltage, pressure, and gas flow rate on the sample loss rate, absorbance, and the surface morphology of sample by SEM has been studied to find optimum discharge conditions.

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Trace impurity analysis of Cu films using GDMS: concentration change of impurities by applying negative substrate bias voltage (글로우방전 질량분석법을 이용한 구리 박막내의 미량불순물 분석: 음의 기판 바이어스에 의한 불순물원소의 농도변화)

  • Lim Jae-Won;Isshiki Minoru
    • Journal of the Korean Vacuum Society
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    • v.14 no.1
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    • pp.17-23
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    • 2005
  • Glow discharge mass spectrometry(GDMS) was used to determine the impurity concentrations of the deposited Cu films and the 6N Cu target. Cu films were deposited on Si (100) substrates at zero substrate bias voltage and a substrate bias voltage of -50 V using a non-mass separated ion beam deposition method. Since do GDMS has a little difficulty to apply to thin films because of the accompanying non-conducting substrate, we have used an aluminum foil to cover the edge of the Cu film in order to make an electrical contact of the Cu film deposited on the non-conducting substrate. As a result, the Cu film deposited at the substrate bias voltage of -50 V showed lower impurity contents than the Cu film deposited without the substrate bias voltage although both the Cu films were contaminated during the deposition. It was found that the concentration change of each impurity in the Cu films by applying the negative substrate bias voltage is related to the difference in their ionization potentials. The purification effect by applying the negative substrate bias voltage might result from the following reasons: 1) Penning ionization and an ionization mechanism proposed in the present study, 2) difference in the kinetic energy of accelerated Cu+ ions toward the substrate with/without the negative substrate bias voltage.

Fundamental Studies of the Electrical Characteristics of the Glow Discharge for the Development of HPLC Detector (글로우방전을 이용한 액체크로마토그라피 검출기 개발을 위한 기초특성연구)

  • 이현주;김효진
    • YAKHAK HOEJI
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    • v.39 no.4
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    • pp.427-432
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    • 1995
  • The plasma oscillation has been observed in an argon pressure between a tungsten anode and cathode consisting of an aqueous conducting solution. The effects of experimental parameters on the electrical characteristics of the glow discharge have been studied. The experimental parameters include the anode-cathode distance, pressure, methanol flow rate, and cathode materials. The glow discharge with liquid cathode and solid anode showed the potential sensitive detector for HPLC

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