Nanofibers Technologies in Air Filtrations Reza Faridi-Majidi Tehran University of Medical sciences
A comparison Number of Surface area of total Length Diameter Volume Surface area of 1 fibers (mm 2 ) (mm) (nm) (mm 3 ) Fibers fiber (mm 2 ) 1 31.4 A Human Hair 1000 100000 7.85 31.4 7.85×10 -6 1000000 31400 A nanofiber 1000 100 0.0314 Nanofibers Human Hair 2
Variety of Electrospun Nanofibers Solid id Porous ous Core re-shel ell Random ndom Aligned ned Layer ered ed Yarn rn Hollow ow yar arn Membrane/ ne/Shee heet Seeram Ramakrishna, NUS Center for Nanofibers & Nanotechnology
Scientific publications Scientific Articles (Iran) 6000 500 5000 400 4000 Number 300 3000 Number 200 2000 1000 100 0 0 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 Year Year Iran World Source: Scopus till end of 2018 4
Applications Filtration • Air and liquid filter • Anti-microbial filter Industrial Catalysis • Chemical Catalysts • Electrochemical Catalysts • Photocatalysts Electronic Devices • Field-Effect Transistor • Chemical Sensors Drug delivery Wound dressing Medical Tissue engineering • Scaffolds • Implants • ECM mimicking medium Biosensor • Chemical • Electrochemical Li, Z. and C. Wang, One-dimensional nanostructures: electrospinning technique and unique nanofibers. 2013: Springer.
Filter Application Major Performance Characteristics for Air Filters based on Market Survey 1-Efficiency 2-Pressure Drop 3- Dust holding Capacity (Life Time )
Microfiber of main filters paper Filters’ paper classification Final Pressure Average efficiency (Em) Class Drop of 0,4 µm particles % Pa F7 450 80 < Em < 90 F8 450 90 < Em < 95 F9 450 95 < Em 7
Filtration 40 8
SEM Images of Nanofibers on filter paper 9
Filtration Efficiency tests 10
2012 11
Industrial Nanofiber production line (INFL) Winde nder a and nd rew ewin inder er Na Nanofib iber er d dia iamet eter ers: • Servo motor control system · 60 to 500 nm • Substrate speed: 100 to 600 m/h Elect lectrospin innin ing Un Unit it: • Maximum substrate width: 1 meter · 4-8 units 12 2015
Market in Iran Power Plants which are using this technology in Iran: Kerman Persian Gulf Parsian Hasheninejad Tabriz Bandar abbas Yazd Damavand Natural Gas zones Some petrochemical unites … 13
Improvement of energy converting in power plant Using these nanofilters, 0.25-0.5 % improvement in energy conversion can be achieved. That means: Total Natural 1% Saving cost of fuel Reducing Reducing gas combustion improvement (0.3 USD per 1 Cubic warming pollution In power plant meter) energy in in Iran environment 100 billion m 3 250-500 75-150 8000-16000 ?? million m 3 Million USD MJ (or 1500- 3000 MWhr) Moreover we should add saving related to 1-the life time of blades used in power plant 2-and also decreasing shutting down time related to exchanging blade and used filters 14
pollution Iran Air pollution was estimated to cause 4.2 million China premature deaths worldwide per year. (April of 2019, www.who.int/airpollution/en/) 15
Respiratory Face Mask
Window Screen Insects protection dusts protection Appearance
Industrial-scale nanofibers production units Now: 6 machines in China (2018-2019) 1 machines in South Korea (2016) 3 machines in Malaysia (2016-2018) 10 machines in Iran (2014-2018)
Thank you for your attention! 19
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