Plasma afterglow circulation apparatus for decontamination of spacecraft equipment
Plasma afterglow circulation apparatus for decontamination of spacecraft equipment
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DOI：
10.1063/1.5040303
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发表时间：
2018-10-01
期刊：
影响因子：
1.6
通讯作者：
Thomas, Hubertus
中科院分区：
文献类型：
--
作者：
Mueller, Meike;Shimizu, Tetsuji;Thomas, Hubertus
介绍了一种新研制的冷大气等离子体(CAP)去污装置，为航天器设备去污提供了一种有效的替代方法。设计的装置使用由表面微放电(SMD)技术产生的等离子体余辉，并在室温下与环境空气的循环气流一起工作。此外，该设备允许控制气体流量、等离子体功率和湿度，并提供O-3监测和可变处理量。在本研究中，我们通过评价不同处理体积对阿曲霉细菌内孢子灭活效果的影响来检验该装置的性能。对阿特菲芽孢杆菌的实验表明，在体积分别为0.54 L、1.8 L和2.6 L的处理室内，作用10、20和30min后，至少减少了4.4个对数。这些结果表明，新研制的装置可以达到很高的杀孢子效果，并且由于不同处理体积中活性成分的填充率不同，处理体积较大需要更长的处理时间。总之，这些研究表明，所设计的装置可扩展到2.6L，用于平坦表面样品的余辉处理。用傅里叶变换红外光谱(FTIR)和紫外吸收光谱分析了等离子体余辉的组成。光谱分析表明，O-3、N2O和HNO3是CAP装置的主要产物。(C)2018年作者(S)。
A newly developed apparatus using cold atmospheric plasma (CAP) is presented, providing a useful alternative decontamination method for spacecraft equipment. The designed setup uses the plasma afterglow generated by a surface micro-discharge (SMD) technology and works with a circulating gas flow of ambient air at room temperature. Additionally, the apparatus allows the control of gas flow, plasma power and humidity, and offers O-3 monitoring and a variable treatment volume. Within this study we examined the apparatus' performance by evaluation of the inactivation efficacy of bacterial endospores Bacillus atrophaeus in different treatment volumes of 0.54 l, 1.8 l and 2.6 l. The experiments with Bacillus atrophaeus showed at least a 4.4 log reduction after the treatment times of 10, 20 and 30 min in the respective treatment chambers with a volume of 0.54 l, 1.8 l and 2.6 l. These results demonstrate that high sporicidal effects can be achieved with the newly developed apparatus, and that longer treatment times are needed for larger treatment volumes due to different filling rates of reactive components in different treatment volumes. Conclusively, these investigations illustrate the scalability of the designed apparatus up to 2.6 l for the afterglow treatment of samples with flat surfaces. The composition of the plasma afterglow was analysed by Fourier Transformation Infrared (FTIR) and UV absorption spectroscopy. The spectroscopic analyses identify O-3, N2O, and HNO3 as predominant products of the CAP apparatus. (c) 2018 Author(s).