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使用电晕放电处理 (CDT) 对由各种织物（包括无纺聚合物和针织布）制成的 N95 面罩呼吸器和面罩 (FM) 进行充电的实验方法。我们提出了实用的设计，利用常用部件构建 CDT 系统，并在不同织物上进行详细校准，以研究其充电特性。在确认 CDT 后织物的结构完整性后，测量表明所有非织造聚合物驻极体和只有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途径，而离子吸附会导致针织物中产生电荷。过滤测试表明，无纺聚合物驻极体过滤器的稳定过滤效率有所提高。另一方面，能够保持电荷的针织布过滤器首先提高了过滤效率，根据织物类型，过滤效率会在长达 7 小时内衰减，并且过滤效率会跟踪放电。几秒钟的快速充电可确保 FM 在多个周期内重复使用而不会降低性能。