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생의학 응용을 위한 마이크로파 플라즈마의 특성에 관한 연구 : Distinctive Characteristics of Microwave Plasmas for Biomedical Applications 원문보기

  • 저자

    이현욱

  • 학위수여기관

    포항공과대학교 일반대학원

  • 학위구분

    국내박사

  • 학과

    전자전기공학과

  • 지도교수

    이재구

  • 발행년도

    2014

  • 총페이지

  • 키워드

    microwave plasma atmospheric pressure plasma biomedical applications nonthermal plasma plume formation bactericidal effect;

  • 언어

    eng

  • 원문 URL

    http://www.riss.kr/link?id=T13533507&outLink=K  

  • 초록

    Distinctive characteristics of microwave excited plasmas (> 0.5 GHz) are observed. Microwave Ar plasmas form a plasma plume, whereas microwave He plasmas are confined and ring-shaped on the contrary to low frequency plasmas (~ kHz). As the frequency increases from 0.9 GHz to 2.45 GHz, the Ar plasma exhibits radial contraction and filamentation. The He plasma is constricted in all directions with increasing frequency. The He plasmas are more strongly affected by the electric field than the Ar plasmas. The breakdown and sustain powers yields opposite results from those for low-frequency plasmas (~kHz). Penning ionization and the contribution of secondary electrons in sheath region reduce as the frequency increases, leading to less efficient ionization of He because its ionization and excitation energies are higher than those of Ar. Emission spectra of the microwave plasmas show the frequency effect on the generation of reactive species including ROS and RNS in terms of biomedical applications. The frequency effect of properties such as the plasma impedance, electron density, and device efficiency are presented. Another interesting behavior is observed when the 0.9 GHz microwave Ar plasma jet (uAPJ) contacts a human finger or grounded metals. No plasma channel and no attraction of the jet to the targets are observed in contrast to low frequency plasmas. Glow-to-arc transition does not occur even at a very small target distance (


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