Propagation of atmospheric pressure plasmas through interconnected pores in dielectric materials
Propagation of atmospheric pressure plasmas through interconnected pores in dielectric materials
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DOI：
10.1063/5.0045706
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发表时间：
2021-04
影响因子：
3.2
通讯作者：
Juliusz Kruszelnicki;Runchu Ma;M. Kushner
中科院分区：
文献类型：
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作者：
Juliusz Kruszelnicki;Runchu Ma;M. Kushner
大气压等离子体（APP）在多孔介电材料上和通过多孔介电材料的传播正在研究用于组织支架和骨再生的等离子体催化和功能化生物医学材料。这种等离子体功能化改善了润湿性和细胞附着，因此孔表面处理的均匀性是重要的。APP通过多孔介质传播的方法尚未得到很好的表征。在本文中，我们讨论的结果从湿空气APP传播通过短的完全互连的孔链在介质基板的计算调查。选择电介质和孔（直径150 μm）的特性以类似于骨支架。我们发现，光电离是等离子体通过孔链传播的一个重要特征，种子电子在链中的后续孔。这种在高电场区域中的电子播种允许形成微流光和表面电离波。当孔之间的开口很小时，这是特别重要的。相对于所施加的电场的孔链的取向对等离子体的产生、传播模式和短寿命的反应性物种对孔表面的注量具有显著影响。随着孔链的角度偏离与所施加的电场对齐，带电和短寿命中性物质到孔表面的注量的均匀性降低。孔内的扩散提高了均匀性的注量孔表面的长寿命的物种在较长的时间尺度上相比，其后放电的均匀性。
The propagation of atmospheric pressure plasmas (APPs) on and through porous dielectric materials is being investigated for plasma-catalysis and functionalizing biomedical materials for tissue scaffolding and bone regeneration. Such plasma functionalization improves wettability and cell attachment, and so uniformity of the treatment of the pore surfaces is important. The method of propagation of APPs through porous media is not well characterized. In this paper, we discuss results from a computational investigation of humid air APPs propagating through short fully interconnected pore-chains in a dielectric substrate. The properties of the dielectric and pores (diameter 150 μm) were chosen to resemble bone scaffolding. We found that photoionization is an important feature in plasma propagation through pore-chains to seed electrons in the following pore in the chain. This seeding of electrons in regions of high electric field allows for the formation of micro-streamers and surface ionization waves. This is particularly important when the openings between pores are small. The orientation of the pore-chain with respect to the applied electric field has a significant impact on plasma generation, mode of propagation, and fluences of short-lived, reactive species to the surfaces of the pores. The uniformity of fluences of charged and short-lived neutral species to the pore surfaces decreases as the angle of the pore chain deviates from being aligned with the applied electric field. Diffusion within pores improves the uniformity of fluences to pore surfaces for long-lived species on longer time scales compared to their post-discharge uniformity.