Radio-frequency oxygen plasma as a sterilization source
Radio-frequency oxygen plasma as a sterilization source
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DOI：
10.2514/1.9562
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发表时间：
2004-04-01
期刊：
影响因子：
2.5
通讯作者：
Meyyappan, M
中科院分区：
文献类型：
--
作者：
Bol'shakov, AA;Cruden, BA;Meyyappan, M
氧等离子体持续在13.56 MHz，在一个标准化的反应器与平面感应线圈用于生物去污实验。光发射，质谱，朗缪尔探针，和电气测量应用于检测的化学物种和离子能量和通量分析。这些诊断确定了在13-67-Pa压力和100-330-W感应线圈功率范围内的等离子体模式转换。在较高的压力和较低的功率下，等离子体维持在暗淡模式（主要通过杂散电容耦合）。在较低的气压和较高的功率下获得了主要的感应亮模。等离子体操作的耦合模式，然后通过发射光谱在一个类似的，按比例缩小的反应器进行生物降解试验进行监测。在两种等离子体模式下比较质粒DNA降解效率。在相同功率下，电感耦合模式比电容耦合模式的DNA去除效率高25%。快速降解归因于协同机制（氧原子和可能的O-2（*）亚稳分子的光和离子辅助蚀刻）。比较了暴露于等离子体的微生物（耐辐射球菌）和多肽样品的分解产物（CO2、CO、N-2、OH、H）的挥发速率。考虑了在火星大气中维持的等离子体。
An oxygen plasma sustained at 13.56 MHz in a standardized reactor with a planar induction coil was used for biological decontamination experiments. Optical emission, mass spectrometry, Langmuir probe, and electrical measurements were applied to detection of chemical species and ion-energy and flux analysis. These diagnostics identified a plasma-mode transition in the range of 13-67-Pa pressure and 100-330-W power to the induction coil. At higher pressure and lower power, the plasma was sustained in a dim mode (primarily by stray capacitive coupling). A primarily inductive bright mode was attained at lower pressure and higher power. The coupling mode of plasma operation was then monitored by emission spectroscopy on an analogous, scaled-down reactor for biological degradation tests. Plasmid DNA degradation efficacies were compared in both plasma modes. DNA removal was similar to25% more efficient in the inductively coupled mode than in the capacitively coupled mode at the same power. The fast degradation was attributed to synergetic mechanisms (photo- and ion-assisted etching by oxygen atoms and perhaps O-2(*) metastable molecules). Volatilization rates of the decomposition products (CO2, CO, N-2, OH, H) evolving from the microbial (Deinococcus radiodurans) and polypeptide samples exposed to the plasma were compared. A plasma sustained in Martian atmosphere is considered.