The Experts below are selected from a list of 50292 Experts worldwide ranked by ideXlab platform
Gerd Mauschitz - One of the best experts on this subject based on the ideXlab platform.
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Estimation of the particle penetration and the dust holding Capacity of different surface-treated needle felts
Separation and Purification Technology, 2007Co-Authors: Wilhelm Hoeflinger, Gerd MauschitzAbstract:For surface-treated filter media porosity properties at and just below the filter surface are essential for the particle penetration and particle clogging behaviour. In order to compare the porosities of different surface-treated filter media, a determination method, which works with a transmitted light microscope and an analysis software was developed. Using the measuring results of this method in combination with test results (clean gas concentration and particle deposition) of a VDI 3926 type 2-test equipment a linear relationship between the clean gas concentration and the surface porosities of the filter media (effective surface porosity) can be found. The effective surface porosity is determined by a pore blocking diameter d b , below all pores remain blocked and above remain open during the stationary cycled filtration procedure. This value of d b seems to be constant for different surface-treated filter media, presuming the tests have been executed at the same test equipment with the same test dust. Further a so-called pore volume equivalent can be determined by the microscopic measurement, which can be also linearly related to the deposited dust mass inside the filter media. With these two linear relationships the particle penetration and the dust holding Capacity can be estimated for different surface-treated filter media.
Bin Ding - One of the best experts on this subject based on the ideXlab platform.
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microwave structured polyamide 6 nanofiber net membrane with embedded poly m phenylene isophthalamide staple fibers for effective ultrafine particle filtration
Journal of Materials Chemistry, 2016Co-Authors: Shichao Zhang, Jianyong Yu, Bin DingAbstract:Effective air filtration proposed for fibers requires their assembly into a porous structure with small pore size, low packing density, and controllable macro-structure; however, creating such filtration media has proved to be a grand challenge. Here, we introduce a strategy to create microwave structured polyamide-6/poly(m-phenylene isophthalamide) nanofiber/net (PA-6/PMIA NFN) membranes for effective air filtration by combining the electro-spinning/netting (ESN) and staple fiber intercalating process. Our approach causes the PA-6 NFN membrane composed of one-dimensional (1D) nanofibers and 2D Steiner-tree nanonets, and the embedded PMIA staple fibers, to assemble into a stable filtration medium with tunable pore size, packing density, and microwave fluctuation by facilely optimizing binary fiber construction and extrinsic staple fiber intercalation. By virtue of the integrated structural properties of small pore size (∼0.32 μm), high porosity (91.3%), and extended surface area, the resulting PA-6/PMIA NFN filter can effectively filter ultrafine airborne particles, mainly using physical sieving, with high filtration efficiency of 99.995%, low pressure drop of 101 Pa, desirable quality factor of 0.1 Pa−1, and large Dust-Holding Capacity of >50 g m−2, which match well with the requirements for treating the real particulate matter (PM) pollutions. This work would not only provide great potential for PM2.5 governance, but also open new avenues for the design and development of stable porous membranes with controllable macro-structures for various applications.
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efficient and reusable polyamide 56 nanofiber nets membrane with bimodal structures for air filtration
Journal of Colloid and Interface Science, 2015Co-Authors: Shichao Zhang, Xueli Wang, Jianyong Yu, Bin DingAbstract:Abstract Nanofibrous media that both possess high airborne particle interception efficiency and robust air permeability would have broad technological implications for areas ranging from individual protection and industrial security to environmental governance; however, creating such filtration media has proved extremely challenging. Here we report a strategy to construct the bio-based polyamide-56 nanofiber/nets (PA-56 NFN) membranes with bimodal structures for effective air filtration via one-step electrospinning/netting. The PA-56 membranes are composed of completely covered two-dimensional (2D) ultrathin (∼20 nm) nanonets which are optimized by facilely regulating the solution concentration, and the bonded scaffold fibers constructed cavity structures which are synchronously created by using the CH3COOH inspiration. With integrated properties of small aperture, high porosity, and bonded scaffold, the resulting PA-56 NFN membranes exhibit high filtration efficiency of 99.995%, low pressure drop of 111 Pa, combined with large dust holding Capacity of 49 g/m2 and dust-cleaning regeneration ability, for filtrating ultrafine airborne particles in the most safe manner involving sieving principle and surface filtration. The successful synthesis of PA-56 NFN medium would not only make it a promising candidate for air filtration, but also provide new insights into the design and development of nanonet-based bimodal structures for various applications.
Wilhelm Hoeflinger - One of the best experts on this subject based on the ideXlab platform.
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Estimation of the particle penetration and the dust holding Capacity of different surface-treated needle felts
Separation and Purification Technology, 2007Co-Authors: Wilhelm Hoeflinger, Gerd MauschitzAbstract:For surface-treated filter media porosity properties at and just below the filter surface are essential for the particle penetration and particle clogging behaviour. In order to compare the porosities of different surface-treated filter media, a determination method, which works with a transmitted light microscope and an analysis software was developed. Using the measuring results of this method in combination with test results (clean gas concentration and particle deposition) of a VDI 3926 type 2-test equipment a linear relationship between the clean gas concentration and the surface porosities of the filter media (effective surface porosity) can be found. The effective surface porosity is determined by a pore blocking diameter d b , below all pores remain blocked and above remain open during the stationary cycled filtration procedure. This value of d b seems to be constant for different surface-treated filter media, presuming the tests have been executed at the same test equipment with the same test dust. Further a so-called pore volume equivalent can be determined by the microscopic measurement, which can be also linearly related to the deposited dust mass inside the filter media. With these two linear relationships the particle penetration and the dust holding Capacity can be estimated for different surface-treated filter media.
Scott W Schwartz - One of the best experts on this subject based on the ideXlab platform.
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DEVELOPMENT OF HIGH DUST Capacity, HIGH EFFICIENCY ENGINE AIR FILTER WITH NANOFIBERS
2014Co-Authors: Tadeusz Jaroszczyk, Stephen L Fallon, Scott W SchwartzAbstract:Although Dust-Holding Capacity is the primary feature of engine air filters operating in dusty environments, efficiency becomes a major factor when selecting an engine air filter. Inertial separators and high porosity or fibrous prefilters are commonly used to decrease the dust load to the main filter while high efficiency is achieved by utilizing submicron or nanofiber fibers in the main filter. The patented multi-stage filter was designed to achieve ultra-high particle removal efficiency and dust holding Capacity, and long life in dusty and on highway environments. The main (final) filter is located downstream of the prefilter. The main filter is made of pleated filter media containing nanofibers with a diameter in the range of 40 – 800 nanometers. The upstream in-line precleaner utilizing flow-through mini cyclones has separation efficiency of 95%. A high dust Capacity, high efficiency prefilter can be used instead of the precleaner. The prefilter is made of vertically lapped nonwoven filter media made from synthetic fibers of different materials to fully utilize the tribological effect. The volume of the prefilter is determined by the performance required and space allotted. This paper discusses the filter performance of high dust holding Capacity engine air filters. Filter specifications, design and performance are discussed in detail. Performance characteristics of the media and full size filters were determined using on-line particle counters and the gravimetric test method. Initial and final efficiency, and dus
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development of high dust Capacity high efficiency engine air filter with nanofibres
Journal of KONES, 2008Co-Authors: Tadeusz Jaroszczyk, Stephen L Fallon, Scott W SchwartzAbstract:Although Dust-Holding Capacity is the primary feature of engine air filters operating in dusty environments, efficiency becomes a major factor when selecting an engine air filter. Inertial separators and high porosity or fibrous prefilters are commonly used to decrease the dust load to the main filter while high efficiency is achieved by utilizing submicron or nanofiber fibers in the main filter. The patented multi-stage filter was designed to achieve ultra-high particle removal efficiency and dust holding Capacity, and long life in dusty and on highway environments. The main (final) filter is located downstream of the prefilter. The main filter is made of pleated filter media containing nanofibers with a diameter in the range of 40 – 800 nanometers. The upstream in-line precleaner utilizing flow-through mini cyclones has separation efficiency of 95%. A high dust Capacity, high efficiency prefilter can be used instead of the precleaner. The prefilter is made of vertically lapped nonwoven filter media made from synthetic fibers of different materials to fully utilize the tribological effect. The volume of the prefilter is determined by the performance required and space allotted. This paper discusses the filter performance of high dust holding Capacity engine air filters. Filter specifications, design and performance are discussed in detail. Performance characteristics of the media and full size filters were determined using on-line particle counters and the gravimetric test method. Initial and final efficiency, and dust loading performance characteristics, are provided.
Shichao Zhang - One of the best experts on this subject based on the ideXlab platform.
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microwave structured polyamide 6 nanofiber net membrane with embedded poly m phenylene isophthalamide staple fibers for effective ultrafine particle filtration
Journal of Materials Chemistry, 2016Co-Authors: Shichao Zhang, Jianyong Yu, Bin DingAbstract:Effective air filtration proposed for fibers requires their assembly into a porous structure with small pore size, low packing density, and controllable macro-structure; however, creating such filtration media has proved to be a grand challenge. Here, we introduce a strategy to create microwave structured polyamide-6/poly(m-phenylene isophthalamide) nanofiber/net (PA-6/PMIA NFN) membranes for effective air filtration by combining the electro-spinning/netting (ESN) and staple fiber intercalating process. Our approach causes the PA-6 NFN membrane composed of one-dimensional (1D) nanofibers and 2D Steiner-tree nanonets, and the embedded PMIA staple fibers, to assemble into a stable filtration medium with tunable pore size, packing density, and microwave fluctuation by facilely optimizing binary fiber construction and extrinsic staple fiber intercalation. By virtue of the integrated structural properties of small pore size (∼0.32 μm), high porosity (91.3%), and extended surface area, the resulting PA-6/PMIA NFN filter can effectively filter ultrafine airborne particles, mainly using physical sieving, with high filtration efficiency of 99.995%, low pressure drop of 101 Pa, desirable quality factor of 0.1 Pa−1, and large Dust-Holding Capacity of >50 g m−2, which match well with the requirements for treating the real particulate matter (PM) pollutions. This work would not only provide great potential for PM2.5 governance, but also open new avenues for the design and development of stable porous membranes with controllable macro-structures for various applications.
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efficient and reusable polyamide 56 nanofiber nets membrane with bimodal structures for air filtration
Journal of Colloid and Interface Science, 2015Co-Authors: Shichao Zhang, Xueli Wang, Jianyong Yu, Bin DingAbstract:Abstract Nanofibrous media that both possess high airborne particle interception efficiency and robust air permeability would have broad technological implications for areas ranging from individual protection and industrial security to environmental governance; however, creating such filtration media has proved extremely challenging. Here we report a strategy to construct the bio-based polyamide-56 nanofiber/nets (PA-56 NFN) membranes with bimodal structures for effective air filtration via one-step electrospinning/netting. The PA-56 membranes are composed of completely covered two-dimensional (2D) ultrathin (∼20 nm) nanonets which are optimized by facilely regulating the solution concentration, and the bonded scaffold fibers constructed cavity structures which are synchronously created by using the CH3COOH inspiration. With integrated properties of small aperture, high porosity, and bonded scaffold, the resulting PA-56 NFN membranes exhibit high filtration efficiency of 99.995%, low pressure drop of 111 Pa, combined with large dust holding Capacity of 49 g/m2 and dust-cleaning regeneration ability, for filtrating ultrafine airborne particles in the most safe manner involving sieving principle and surface filtration. The successful synthesis of PA-56 NFN medium would not only make it a promising candidate for air filtration, but also provide new insights into the design and development of nanonet-based bimodal structures for various applications.
