Efficient and reusable polyamide-56 nanofiber/nets membrane with bimodal structures for air filtration

Liu, Bowen; Zhang, Shichao; Wang, Xueli; Yu, Jianyong; Ding, Bin

doi:10.1016/j.jcis.2015.07.019

Cited by 179 publications

(136 citation statements)

References 44 publications

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“…Figure 5a and S4 show that the PMIA NF/N membranes fabricated with improved DTAB content at RH of 25% possess a tensile strength of 36.8, 51.6, 61.4, and 72.8 MPa, respectively, indicating a significant enhancement in contrast to the PMIA membranes without nanonets (35.3 MPa). Moreover, these PMIA NF/N membranes with widely distributed nanonets exhibited dramatically enhanced tensile strength compared to previously reported nanonets-based filter media, such as PA-5619, PA-6/PAN31, PA-6/PMIA staple fibers32, and so on (Table S6). As expected, compared to the relatively low Young’s modulus and toughness (Figure S1) of the pristine PMIA nanofibers, the membranes formed with increased DTAB concentration (0–0.15 wt%), i.e., with optimized coverage rate of nanonets, showed the enhanced toughness of 6.62, 9.49, 10.93, and 14.49 MJ m −3 and Young’s modulus of 0.507, 0.631, 0.742, and 0.935 GPa, respectively.…”

Section: Resultsmentioning

confidence: 71%

“…These filters showed a capture efficiency of 99.9% and a rather high pressure drop of ~200 Pa owing to their limited nanonet coverage rate and large thickness of 19.05 μm, which could not satisfy the demands for practical applications21. Subsequently, the polyamide-56 NF/N filter gained improved removal efficiency of >99.99%; however, its air resistance was rather high (>110 Pa) due to the bonding structures19. Recently, nylon-6 NF/N filters with cavity structures (enlarged voids between the adjacent fibers) were designed and fabricated by embedding PAN nanofibers or poly( m -phenylene isophthalamide) staple fibers into the membranes, and their air permeability was effectively enhanced.…”

mentioning

confidence: 99%

“…Compared to various methods including drawing, flash-spinning, sea-island spinning and template synthesis, electrospinning has been widely regarded as a robust and scalable nanotechnology for producing nanofibers with organic/inorganic components and designed structures12131415. Many electrospun fibers (diameter 100–1000 nm), including polyurethane (PU)16, polyacrylonitrile (PAN)1718, polyvinyl chloride/PU5, polyamide-5619, poly(lactic acid)20, and nylon-6621, have been carefully fabricated and gained significantly improved filtration performance22. Nevertheless, some drawbacks still remain, such as limited structural controllability, weak mechanical properties, low production rates, and a low quality factor indicating an inadequate filtration performance.…”

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confidence: 99%

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Tailoring Mechanically Robust Poly(m-phenylene isophthalamide) Nanofiber/nets for Ultrathin High-Efficiency Air Filter

Zhang

Liu

Yin

et al. 2017

Sci Rep

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Effective promotion of air filtration applications proposed for fibers requires their real nanoscale diameter, optimized pore structure, and high service strength; however, creating such filter medium has proved to be a tremendous challenge. This study first establishes a strategy to design and fabricate novel poly(m-phenylene isophthalamide) nanofiber/nets (PMIA NF/N) air filter via electrospinning/netting. Our strategy results in generation of a bimodal structure including a scaffold of nanofibers and abundant two-dimensional ultrathin (~20 nm) nanonets to synchronously construct PMIA filters by combining solution optimization, humidity regulation, and additive inspiration. Benefiting from the structural features including the true nanoscale diameter, small pore size, high porosity, and nets bonding contributed by the widely distributed nanonets, our PMIA NF/N filter exhibits the integrated properties of superlight weight (0.365 g m−2), ultrathin thickness (~0.5 μm), and high tensile strength (72.8 MPa) for effective air filtration, achieving the ultra-low penetration air filter level of 99.999% and low pressure drop of 92 Pa for 300–500 nm particles by sieving mechanism. The successful synthesis of PMIA NF/N would not only provide a promising medium for particle filtration, but also develop a versatile platform for exploring the application of nanonets in structural enhancement, separation and purification.

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Section: Resultsmentioning

confidence: 71%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Tailoring Mechanically Robust Poly(m-phenylene isophthalamide) Nanofiber/nets for Ultrathin High-Efficiency Air Filter

Zhang

Liu

Yin

et al. 2017

Sci Rep

Self Cite

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“…Governança/Gestão de águas Leslie et al (2015) Operationalizing the social-ecological systems framework to assess sustainability Avaliação de sustentabilidade Gómez-Baggethun & Muradian (2015) In markets we trust? Setting the boundaries of MarketBased Instruments in ecosystem services governance Gestão de ecossistemas Liu et al (2015) Efficient and reusable polyamide-56 nanofiber/nets membrane with bimodal structures for air filtration Poluição do ar Van Kerkhoff & Lebel (2015) Coproductive capacities: Rethinking science-governance relations in a diverse world Ciência, governança e diversidade…”

Section: Autoria/anomentioning

confidence: 99%

Governança ambiental em áreas de proteção da biodiversidade: uma revisão sistemática

Bilar

Pimentel

Cerqueira

et al. 2017

J. Env. Anal. Progr.

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As áreas protegidas são importantes instrumentos para a preservação da biodiversidade e a gestão compartilhada desses espaços é um desafio. Os estudos científicos podem apontar caminhos para aperfeiçoar a governança ambiental dessas áreas. Mas, como a comunidade científica vem abordando essa questão? Quais os seus principais interesses de pesquisa? Este artigo objetivou averiguar a evolução histórica dos estudos sobre governança ambiental em áreas protegidas, através de levantamento na base de dados Scopus Elsevier, dada a sua abrangência. Os resultados revelaram um grande número de artigos sobre áreas protegidas, entretanto, quando essa temática foi relacionada à governança ambiental, a quantidade de estudos foi diminuta, destacando-se enquanto temas correlatos nesses poucos artigos encontrados: engajamento e representatividade social, relações entre Estado e sociedade/comunidades, conflitos territoriais, desenvolvimento e conservação. Constatou-se que os estudos sobre governança ambiental em áreas de proteção precisam ser fortalecidos e o número de publicações elevado, especialmente nos centros de pesquisa latino-americanos.Palavras-Chave: Gestão participativa, espaços legalmente protegidos, preservação.

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“…[5][6][7] The required morphology of the nanober material is obtained by changing the production conditions. [8][9][10] The needles commonly used as electrospinning nozzles in conventional laboratories have lower production efficiencies typically with a spinning capacity of 0.01-0.1 g h À1 .…”

Section: Introductionmentioning

confidence: 99%

Stable multi-jet electrospinning with high throughput using the bead structure nozzle

et al. 2018

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A modified bead structure nozzle for the electrospinning process was developed to improve the production efficiency of nanofibers and facilitate the cleaning of equipment. The effects of the flow rate, voltage and receiving distance on the number of jets were studied. The results indicate that the number of stable jets can be effectively controlled by spinning conditions. The rotating spinning phenomenon, which occurred during spinning, was subjected to force analysis. The COMSOL Multiphysics model was applied to simulate the electric field to show that the bead structured nozzle does not change the overall spinning electric field compared with traditional spinning. The results indicate that the bead structure nozzle can produce a stable multi-jet using a curved surface structure and improve the production efficiency of nanofibers. Compared with the high-voltage conditions of needleless spinning, the beadtype nozzle helps to save energy and facilitate cleaning, so as to avoid the production of waste in experimental research and industrial production.

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Efficient and reusable polyamide-56 nanofiber/nets membrane with bimodal structures for air filtration

Cited by 179 publications

References 44 publications

Tailoring Mechanically Robust Poly(m-phenylene isophthalamide) Nanofiber/nets for Ultrathin High-Efficiency Air Filter

Tailoring Mechanically Robust Poly(m-phenylene isophthalamide) Nanofiber/nets for Ultrathin High-Efficiency Air Filter

Governança ambiental em áreas de proteção da biodiversidade: uma revisão sistemática

Stable multi-jet electrospinning with high throughput using the bead structure nozzle

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