Bandi M M, Ishizu N, Kang H-B
Nonlinear and Non-equilibrium Physics Unit, and.
Engineering Support Section, OIST Graduate University, Onna 904 0495, Japan.
Proc Math Phys Eng Sci. 2021 Jul 28;477(2251):20210062. doi: 10.1098/rspa.2021.0062. Epub 2021 Jul 14.
We detail an experimental method to electrocharge N95 facepiece respirators and face masks (FMs) made from a variety of fabrics (including non-woven polymer and knitted cloth) using corona discharge treatment (CDT). We present practical designs to construct a CDT system from commonly available parts and detail calibrations performed on different fabrics to study their electrocharging characteristics. After confirming the post-CDT structural integrity of fabrics, measurements showed that all non-woven polymer electret and only some knitted cloth fabrics are capable of charge retention. Whereas polymeric fabrics follow the well-known isothermal charging route, ion adsorption causes electrocharging in knitted cloth fabrics. Filtration tests demonstrate improved steady filtration efficiency in non-woven polymer electret filters. On the other hand, knitted cloth fabric filters capable of charge retention start with improved filtration efficiency which decays in time over up to 7 h depending on the fabric type, with filtration efficiency tracking the electric discharge. A rapid recharge for a few seconds ensures FM reuse over multiple cycles without degradation.
我们详细介绍了一种实验方法，即使用电晕放电处理（CDT）对由多种织物（包括非织造聚合物和针织布）制成的N95面罩呼吸器和口罩（FMs）进行充电。我们展示了利用常用部件构建CDT系统的实际设计，并详细说明了对不同织物进行的校准，以研究它们的充电特性。在确认织物经CDT处理后的结构完整性后，测量结果表明，所有非织造聚合物驻极体以及仅一些针织布织物能够保持电荷。聚合物织物遵循众所周知的等温充电路径，而离子吸附导致针织布织物带电。过滤测试表明，非织造聚合物驻极体过滤器的稳态过滤效率有所提高。另一方面，能够保持电荷的针织布织物过滤器一开始过滤效率有所提高，但根据织物类型，在长达7小时的时间内过滤效率会随时间衰减，过滤效率与放电情况相关。几秒钟的快速充电可确保FMs在多个循环中重复使用而不降解。
