Filtering and optical properties of free standing electrospun nanomats from nylon-4,6

Mikheev, Andrei Y.; Shlyapnikov, Yuri M.; Kanev, Igor L.; Avseenko, Andrei V.; Морозов, В. Н.

doi:10.1016/j.eurpolymj.2016.01.001

Cited by 25 publications

(25 citation statements)

References 23 publications

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“…S5 ). More importantly, this is consistent with the Knudsen theory that when fiber diameter is close to or less than the mean free path of air molecules, then the air molecules can bypass the fibers freely 26 34 .…”

Section: Resultssupporting

confidence: 87%

“…Three distinct variation regimes could be clearly seen: a linear rapidly descending region with the average fiber diameter d f changing from 168 to 71 nm, a slowly rising region with the average fiber diameter d f decreasing from 71 to 60 nm, and a rapidly rising region with further reduction of average fiber diameter from 60 to 53 nm. The reduction of pressure drop from 15 to 9 Pa (40% reduction) in the rapidly descending region indicated that the air molecules could more easily travel through the membranes as the fiber diameter gradually approached the mean free path of air molecules due to the developing slip flow 34 . Interestingly, the resistance of fibers to air molecules showed an increase of 11% (from 9 to 10 Pa) in the slowly rising region, which was lower than the 20% increase (from 10 to 12 Pa) in the rapidly rising region, indicating that the slip-effect was gradually weakening with the reduction of fiber diameter.…”

Section: Resultsmentioning

confidence: 99%

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Slip-Effect Functional Air Filter for Efficient Purification of PM2.5

Zhao

Wang

Yin

et al. 2016

Sci Rep

168

139

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Fabrication of air filtration materials (AFM) that allow air to easily flow through while retaining particles is a significant and urgent need due to the harmful airborne particulate matter pollution; however, this is still a challenging research area. Herein, we report novel slip-effect functional nanofibrous membranes with decreased air resistance (reduction rate of 40%) due to the slip flow of air molecules on the periphery of nanofibers. This was achieved through careful control over the diameters of electrospun polyacrylonitrile fibers and aperture size of fiber assembly. Fiber assembly with 86% of fiber diameters between 60–100 nm was found to be most effective for slip flow, as these diameters are close to the mean free path of air molecules (65.3 nm). Significantly, an equilibrium factor τ = df/d2 has been introduced to elucidate the effect of distance of adjacent fibers on the drag force of airflow. Furthermore, the most effective aperture size (>3.5 μm) for slip-effect has been determined. Ultimately, the new material displayed low air resistance of 29.5 Pa, high purification efficiency of 99.09%, good transmittance of 77%, and long service life. The successful fabrication of such materials can facilitate the development of high-performance AFMs for various applications.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Slip-Effect Functional Air Filter for Efficient Purification of PM2.5

Zhao

Wang

Yin

et al. 2016

Sci Rep

168

139

View full text Add to dashboard Cite

show abstract

“…Free standing nanomats from random ultrathin nylon-4,6 fibers (RU) were fabricated as described earlier [ 23 ], by electrospinning from a 10% wt. nylon solution in formic acid.…”

Section: Methodsmentioning

confidence: 99%

“…A technique for producing ultrathin nylon-4,6 nanofibers based on electrospinning from a formic acid solution has been reported [ 22 , 23 ]. The diameter of the resulting fibers can be varied, down to approximately 3 nm.…”

Section: Introductionmentioning

confidence: 99%

ECM-Mimetic Nylon Nanofiber Scaffolds for Neurite Growth Guidance

2021

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Numerous nanostructured synthetic scaffolds mimicking the architecture of the natural extracellular matrix (ECM) have been described, but the polymeric nanofibers comprising the scaffold were substantially thicker than the natural collagen nanofibers of neural ECM. Here, we report neuron growth on electrospun scaffolds of nylon-4,6 fibers with an average diameter of 60 nm, which closely matches the diameter of collagen nanofibers of neural ECM, and compare their properties with the scaffolds of thicker 300 nm nanofibers. Previously unmodified nylon was not regarded as an independent nanostructured matrix for guided growth of neural cells; however, it is particularly useful for ultrathin nanofiber production. We demonstrate that, while both types of fibers stimulate directed growth of neuronal processes, ultrathin fibers are more efficient in promoting and accelerating neurite elongation. Both types of scaffolds also improved synaptogenesis and the formation of connections between hippocampal neurons; however, the mechanisms of interaction of neurites with the scaffolds were substantially different. While ultrathin fibers formed numerous weak immature β1-integrin-positive focal contacts localized over the entire cell surface, scaffolds of submicron fibers formed β1-integrin focal adhesions only on the cell soma. This indicates that the scaffold nanotopology can influence focal adhesion assembly involving various integrin subunits. The fabricated nanostructured scaffolds demonstrated high stability and resistance to biodegradation, as well as absence of toxic compound release after 1 month of incubation with live cells in vitro. Our results demonstrate the high potential of this novel type of nanofibers for clinical application as substrates facilitating regeneration of nervous tissue.

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“…More recently, they have further developed transparent air filters; in detail, they have demonstrated a fast and large‐scale transfer method (roll‐to‐roll) for electrospun transparent nanofiber films with enhanced filtration performance (Figure b, v) . Mikheev et al conducted very similar work in preparing transparent electrospun nanomats from nylon‐4,6 to filter sub‐micrometer aerosol particles (they are almost invisible; >95% light transmission).…”

Section: Electrospun Nanofibrous Membranes For Air Filtrationmentioning

confidence: 99%

Electrospun Nanofibers Membranes for Effective Air Filtration

Zhu

Han

Wang

et al. 2016

Macromol. Mater. Eng.

500

352

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In modern society, traffic and transportation and the manufacturing industry and construction industries continuously release large amounts of dust and particles into the atmosphere, which can cause heavy air pollution, leading to health hazards. The haze disaster, a serious problem in developing countries such as China and India, has become one of the main issues of global environmental pollution in recent decades. Many air filtration technologies have been developed. Air filtration using electrospun fibers that intercept fine particles/volatile organic gases/bacterium is a relatively new, but highly promising, technique. Due to their interconnected nanoscale pore structures, highly specific surface areas, fine diameters, and porous structure as well as their ability to incorporate active chemistry on a nanoscale surface, electrospun fibers are becoming a promising versatile platform for air filtration. In this review, following a short introduction concerning the need for air filtration and filtration theory and mechanism, electrospun nanofibers membranes for air filtration have been highlighted, including the preparation (electrospinning process) and the parameters relevant to filtration efficacy. Additionally, various types (function) of the electrospun air filtration membranes have been classified in detail. Furthermore, their potential in the filtration of fine particles and chemical pollutants has been discussed. Finally, the challenges of their practical application and the future prospects have been summarized. Given that some advanced electrospun air filtration nanofibrous membranes exist for treating different contaminants from various types of polluted atmosphere, it is believed that they should make a significant contribution in protection against air pollution.

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Filtering and optical properties of free standing electrospun nanomats from nylon-4,6

Cited by 25 publications

References 23 publications

Slip-Effect Functional Air Filter for Efficient Purification of PM2.5

Slip-Effect Functional Air Filter for Efficient Purification of PM2.5

ECM-Mimetic Nylon Nanofiber Scaffolds for Neurite Growth Guidance

Electrospun Nanofibers Membranes for Effective Air Filtration

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