Elaissi Samira, Alsaif Norah A M
Department of Physics, College of Science, Princess Nourah Bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia.
Polymers (Basel). 2023 Feb 28;15(5):1235. doi: 10.3390/polym15051235.
A nonthermal atmospheric plasma reactor was used to sterilize polymer surfaces and satisfy safety constraints in a biological medium. A 1D fluid model was developed using COMSOL Multiphysics software 5.4 with a helium-oxygen mixture at low temperature for the decontamination of bacteria on polymer surfaces. An analysis of the evolution of the homogeneous dielectric barrier discharge (DBD) was carried out through studying the dynamic behavior of the discharge parameters including the discharge current, the consumed power, the gas gap voltage, and transport charges. In addition, the electrical characteristics of a homogeneous DBD under different operating conditions were studied. The results shown that increasing voltage or frequency caused higher ionization levels and maximum increase of metastable species' density and expanded the sterilization area. On the other hand, it was possible to operate plasma discharges at a low voltage and a high density of plasma using higher values of the secondary emission coefficient or permittivity of the dielectric barrier materials. When the discharge gas pressure increased, the current discharges declined, which indicated a lower sterilization efficiency under high pressure. A short gap width and the admixture of oxygen were needed for sufficient bio-decontamination. Plasma-based pollutant degradation devices could therefore benefit from these results.
使用非热大气等离子体反应器对聚合物表面进行消毒，并满足生物介质中的安全限制。利用COMSOL Multiphysics软件5.4开发了一维流体模型，该模型采用低温氦氧混合物对聚合物表面的细菌进行去污处理。通过研究包括放电电流、消耗功率、气隙电压和传输电荷在内的放电参数的动态行为，对均匀介质阻挡放电（DBD）的演变进行了分析。此外，还研究了不同操作条件下均匀DBD的电学特性。结果表明，增加电压或频率会导致更高的电离水平，亚稳态物种密度最大增加，并扩大消毒区域。另一方面，使用更高的二次发射系数或介质阻挡材料的介电常数，可以在低电压和高密度等离子体下运行等离子体放电。当放电气体压力增加时，电流放电下降，这表明在高压下消毒效率较低。为了实现充分的生物去污，需要短的间隙宽度和氧气混合物。因此，基于等离子体的污染物降解装置可以从这些结果中受益。
