title: In situ fabrication of depth-type hierarchical CNT/quartz fiber filters for high efficiency filtration of sub-micron aerosols and high water repellency.
abstract: We fabricated depth-type hierarchical CNT/quartz fiber (QF) filters through in situ growth of CNTs upon quartz fiber (QF) filters using a floating catalyst chemical vapor deposition (CVD) method. The filter specific area of the CNT/QF filters is more than 12 times higher than that of the pristine QF filters. As a result, the penetration of sub-micron aerosols for CNT/QF filters is reduced by two orders of magnitude, which reaches the standard of high-efficiency particulate air (HEPA) filters. Simultaneously, due to the fluffy brush-like hierarchical structure of CNTs on QFs, the pore size of the hybrid filters only has a small increment. The pressure drop across the CNT/QF filters only increases about 50% with respect to that of the pristine QF filters, leading to an obvious increased quality factor of the CNT/QF filters. Scanning electron microscope images reveal that CNTs are very efficient in capturing sub-micron aerosols. Moreover, the CNT/QF filters show high water repellency, implying their superiority for applications in humid conditions.
authors: Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Tsinghua University, Beijing, 100084, China.
authors: Peng
authors: P
authors: Li
authors: Yichen
authors: Y
authors: Zong
authors: Yingying
authors: Y
authors: Zhang
authors: Mengmeng
authors: M
authors: Yang
authors: Rufan
authors: R
authors: Zhang
authors: Shuiqing
authors: S
authors: Li
authors: Fei
authors: F
authors: Wei
mesh_terms: D000336:Aerosols / Q000302:isolation & purification*; D061808:Air Filters; D052918:Environmental Restoration and Remediation / Q000295:instrumentation* / Q000379:methods; D005374:Filtration / Q000379:methods; D055616:Microtechnology / Q000379:methods*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010316:Particle Size; D052638:Particulate Matter / Q000493:pharmacokinetics; D011791:Quartz / Q000737:chemistry*; D014867:Water / Q000378:metabolism; D017155:Wettability
chemical_list: D000336:Aerosols; D037742:Nanotubes, Carbon; D052638:Particulate Matter; D014867:Water; D011791:Quartz