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.
Author(s): Wallace Woon-Fong Leung
Edition: 1
Publisher: Elsevier
Year: 2021
Language: English
Pages: 571
City: Amsterdam
Epigraph
Contents
Preface
1. Introduction to submicron aerosols and nano
2. Fundamentals of gas filtration of submicron aerosols and nanoaerosols
3. Nanofiber production
4. Filter testing, filter test standards, and filter ratings
5. Filtration characteristics of nanofiber filter and multilayer nanofiber filter for depth filtration
6. Transition from depth-to-surface filtration for a nanofiber filter
7. Cake filtration with a composite micro nanofiber filter
8. Electret filter for depth and cake filtration
9. Numerical modeling of aerosol filtration using a nanofiber filter
10. Cleaning of nanofiber filter
11. Nanofiber filter reuse—repeated loading cleaning cycles
12. Filtration of ambient aerosols
13. Applications of nanofiber filters
14. Outlook
Appendix A: Answer to problems of chapters
Appendix B: Size distribution in dN/d(log(Dp))
Appendix C: Permeability and capillary radius of the skin layer
Appendix D: Cake deposition-resistance ratio, β
Appendix E: Specific filter resistance, γ
Nomenclature
Index
