Nguyen Anh-Phan, Kang Won-Kyu, Lee Jung-Bae, In Jung-Bin
Department of Intelligent Energy and Industry, Chung-Ang University, Seoul 06974, Korea.
Soft Energy Systems and Laser Applications Laboratory, School of Mechanical Engineering, Chung-Ang University, Seoul 06974, Korea.
Materials (Basel). 2021 Sep 24;14(19):5551. doi: 10.3390/ma14195551.
This study demonstrates a novel application of laser-induced graphene (LIG) as a reusable conductive particulate matter (PM) filter. Four types of LIG-based filters were fabricated based on the laser-induced pyrolysis of thin polyimide (PI) sheets, each pyrolyzed on either a single side or both sides, with or without densification. The LIG filters exhibited a high removal efficiency while maintaining minimal pressure drop compared to a commercial fiberglass filter. The densified LIG (dLIG) filters displayed a higher PM removal efficiency (>99.86%) than regular LIG filters. The dLIG filters also exhibited excellent durability when tested for washability by ultrasonication in tap water. After being cleaned and left to dry, the structures of the dLIG filters were well-maintained; their filtration efficiencies were also well-maintained (less than a 7% change in PM removal efficiency), and their resistances only marginally increased (less than a 7% increase after five uses). These results demonstrate the robustness and reusability of the dLIG filters and the accessibility of their cleaning (not requiring aggressive cleaning agents). These promising features will enable the application of LIG in economical, scalable, and high-performance air cleaning.
本研究展示了激光诱导石墨烯（LIG）作为一种可重复使用的导电颗粒物（PM）过滤器的新应用。基于薄聚酰亚胺（PI）片材的激光诱导热解制备了四种类型的LIG基过滤器，每种过滤器在单面或双面进行热解，有或没有致密化处理。与商用玻璃纤维过滤器相比，LIG过滤器在保持最小压降的同时表现出高去除效率。致密化LIG（dLIG）过滤器比普通LIG过滤器显示出更高的PM去除效率（>99.86%）。当通过在自来水中超声处理测试dLIG过滤器的可清洗性时，它们还表现出优异的耐久性。清洗并干燥后，dLIG过滤器的结构保持良好；它们的过滤效率也保持良好（PM去除效率变化小于7%），并且它们的阻力仅略有增加（五次使用后增加小于7%）。这些结果证明了dLIG过滤器的稳健性和可重复使用性以及其清洗的便利性（不需要强腐蚀性清洁剂）。这些有前景的特性将使LIG能够应用于经济、可扩展和高性能的空气净化。
