School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, USA.
Centro de Física Aplicada Tecnología Avanzada, Universidad Nacional Autónoma de México, Juriquilla, Querétaro 76230, Mexico.
Int J Environ Res Public Health. 2022 Jun 13;19(12):7241. doi: 10.3390/ijerph19127241.
The COVID-19 pandemic has resulted in high demand for disinfection technologies. However, the corresponding spray technologies are still not completely optimized for disinfection purposes. There are important problems, like the irregular coverage and dripping of disinfectant solutions on hard and vertical surfaces. In this study, we highlight two major points. Firstly, we discuss the effectiveness of the electrostatic spray deposition (ESD) of nanoparticle-based disinfectant solutions for systematic and long-lasting disinfection. Secondly, we show that, based on the type of material of the substrate, the effectiveness of ESD varies. Accordingly, 12 frequently touched surface materials were sprayed using a range of electrostatic spray system parameters, including ion generator voltage, nozzle spray size and distance of spray. It was observed that for most cases, the surfaces become completely covered with the nanoparticles within 10 s. Acrylic, Teflon, PVC, and polypropylene surfaces show a distinct effect of ESD and non-ESD sprays. The nanoparticles form a uniform layer with better surface coverage in case of electrostatic deposition. Quantitative variations and correlations show that 1.5 feet of working distance, an 80 μm spray nozzle diameter and an ion generator voltage of 3-7 kV ensures a DEF (differential electric field) that corresponds to an optimized charge-to-mass ratio, ensuring efficient coverage of nanoparticles.
新冠疫情大流行导致人们对消毒技术的需求很高。然而，相应的喷雾技术仍未完全针对消毒目的进行优化。在硬而垂直的表面上，消毒剂溶液存在覆盖不规则和滴落等重要问题。在本研究中，我们强调两点。首先，我们讨论了基于纳米颗粒的消毒剂溶液的静电喷雾沉积（ESD）在系统和持久消毒方面的有效性。其次，我们表明，根据基底材料的类型，ESD 的有效性会有所不同。因此，使用一系列静电喷雾系统参数（包括离子发生器电压、喷嘴喷雾大小和喷雾距离）对 12 种经常接触的表面材料进行了喷雾。结果表明，在大多数情况下，表面在 10 秒内完全被纳米颗粒覆盖。亚克力、特氟龙、聚氯乙烯和聚丙烯表面显示出静电和非静电喷雾的明显效果。在静电沉积的情况下，纳米颗粒形成均匀的层，具有更好的表面覆盖率。定量变化和相关性表明，工作距离为 1.5 英尺、喷雾喷嘴直径为 80μm 以及离子发生器电压为 3-7kV 可确保对应的差分电场（DEF）与优化的电荷-质量比相对应，从而确保纳米颗粒的有效覆盖。
