Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 30, Issue 14, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201910426
Keywords
cascade filtration; electrospun nanofibers; gradient architectures; high-temperature filter media; superelastic aerogels
Categories
Funding
- National Natural Science Foundation of China [51973028, 51925302]
- Fundamental Research Funds for the Central Universities [223201900081]
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials [ZR1902]
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Particulate matter (PM) has taken heavy tolls on the global economy and public health, calling for air filters that can remove PM from high-temperature emission sources. However, creating desirable filter media capable of capturing polydisperse fine particles (PFPs) effectively and enduringly, while also withstanding high speed airstream, is extremely challenging. Here, a biomimetic and bottom-up strategy to prepare superelastic, strong, and thermostable nanofibrous aerogels (NFAs) as cascade filters by assembling semi-interpenetrating polymer network (semi-IPN)-based nanofibers into a gradient architecture is reported. Inspired by the robust loofah sponges originating from stiff cellulose networks, the mechanical property of NFAs is enhanced via tailoring the chain flexibility of heat-resistant semi-IPNs. Further constructing a gradient cellular architecture endows NFAs with a versatile cascade filtration behavior for capturing polydisperse fine particles. The resultant semi-IPN-based gradient NFAs exhibit temperature-invariant superelasticity, a high compressive stress (7.9 kPa) and modulus (12 kPa), high filtration efficiency (>99.97%, PM0.3), low pressure drop (approximate to 50% that of membranes), and ultrahigh dust-holding capacity (114 g m(-2)). The fabrication of this attractive material paves the way for designing next-generation air filters for industrial dust removal.
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