Elsevier Nanofiber Filter Technologies for Filtration of Submicron Aerosols and Nanoaerosols

Nanofiber Filter Technologies for Filtration of Submicron Aerosols and Nanoaerosols covers the nanoaerosols (less than 100 nanometers) to larger submicron aerosols due mostly to pollution, which are present in high number concentration in our surroundings. People are breathing these nanoaerosols daily without being aware of it. Airborne viruses from flu to coronaviruses are also nanoaerosols. During the COVID-19 pandemic, it took a long time for health authorities and the General Public to recognize the airborne transmission mode of the virus. This leads to inadequate protection and ineffective virus control strategies resulting in high infection and death rates. The book cites evidence and observations pointing to the airborne transmission mode of the coronavirus. It also discusses different filtration technologies using nanofibers to capture these aerosols for short-term filtration, where aerosols are trapped in the filter (depth filtration), and long-term filtration, where aerosols are trapped in the growing filter cake (cake filtration). This book provides a good understanding on how nanofibers, which is of size 1/1000 times that of a normal human hair, can effectively filter these tiny aerosols. NFT, organized in four sections – fundamentals, deep understanding, technologies, and application, covering comprehensively on the subject, is a valuable resource for undergraduates and graduates, engineers, researchers and practitioners in related industries. Review Advanced nanofiber filter technologies, building on fundamental engineering principles, for filtering nano- and sub-micron aerosols of pollutants and deadly airborne viruses From the Back Cover <p><i>Nanofiber Filter for Filtration of Submicron Aerosols and Nanoaerosols </i>covers the nanoaerosols to larger submicron aerosols which are presence in high abundance in number concentration in our surroundings, on the order of ten thousand's per cubic centimetre of air in 26 cities around the world, some having higher while others slightly lower. People are breathing these nanoaerosols daily without being aware of it. Airborne viruses from flu to coronaviruses are also present in the same size range as nanoaerosols. Existing standards are set for 300nm aerosols. Interception and electrostatic capture using charged microfibers are effective for 300nm aerosols but not for aerosols smaller than 100nm. This book deals with diffusion capture using nanofibers to capture these invisible aerosols. It also summarizes various new technologies deploying nanofibers for capturing nanoaerosols and submicron aerosols, such as composite filter, multilayer nanofiber, depth-to-surface filtration with nanofiber filter, cleaning of loaded nanofiber filter by backpulse-and-backblow, single and multilayer charged nanofiber filter, and real aerosols with uncharged and charged nanofiber filter, monodispersed versus polydispersed aerosols challenging nanofiber filter, CFD in simulating depth and cake filtration, designing high-performance nanofiber filter, etc.</p> About the Author Dr. Wallace Woon-Fong Leung is a Distinguished Research Professor from Hong Kong Polytechnic University. He was formerly Chair Professor of Innovative Products and Technologies (2005-2020) and founder and Director of Research Institute of Innovative Products and Technologies (2005-2011) in the same University. He has worked in filtration and separation for 45 years both in industry in the US and academia in Hong Kong from membrane filtration, sedimentation, vacuum filter, centrifugation, air filtration, and photocatalytic oxidation. He has 52 US patents, single-authored 3 books, several handbook chapters, and over 80 SCI papers. He has trained many engineers and graduated 9 PhD students. He is a fellow respectively of AICHE, ASME, AFS, HKIE, and Hong Kong Academy of Engineering Sciences. He is the Chairman of International Delegation on Filtration, 2016 – 202