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Behnam Pourdeyhimi – One of the best experts on this subject based on the ideXlab platform.

  • The Charging and Stability of Electret Filters
    Fibrous Filter Media, 2017
    Co-Authors: Ali Kilic, Eunkyoung Shim, Stephen J. Russell, Behnam Pourdeyhimi

    Abstract:

    Having a long history in Aerosol Filtration technologies, electret filters are one of the basic solutions to provide high particle capture efficiency at a low pressure drop and energy expense. However, their reliability is still an ongoing issue from the aspects of high efficiency and stability. In this chapter the theory behind electret mechanism, charging of the fibrous materials, their discharging and stability were reviewed in detail. Physics behind the widely used electret filter charging/polarization mechanisms were also discussed.

  • Aerosol Filtration properties of nucleating agent containing electret filters
    Polymer Engineering & Science, 2013
    Co-Authors: Ali Kilic, Behnam Pourdeyhimi, Eunkyoung Shim, Bong-yeol Yeom

    Abstract:

    This study reports on the effects of nucleating agents on morphology, charging, and electrostatic Filtration performance of polypropylene meltblown webs. Two commercial nucleating agents, DMDBS (3:2, 4-bis(3,4-dimethyldibenzylidene) sorbitol) and NA11 (sodium 2,2′-methylene-bis(4,6-di-tertbutylphenyl)-phosphate) were compared. It is hypothesized that faster solidification brought about by the addition of the nucleating agents may be responsible for the slight increase in fiber diameter and concomitant reduction in web solidity. Samples were charged at room temperature as well as at elevated temperatures. Upon thermal charging, significant enhancement in the electrostatic potential and Filtration performance of the webs was observed. Particularly, the stability of electrostatic Filtration performance was found to be promising with the addition of these polarizable additives. Dielectric spectroscopy tests confirmed an increase in capacitance for samples containing nucleating agents. POLYM. ENG. SCI., 54:1533–1539, 2014. © 2013 Society of Plastics Engineers

  • Aerosol Filtration properties of PA6/PE islands-in-the-sea bicomponent spunbond web fibrillated by high-pressure water jets
    Journal of Materials Science, 2011
    Co-Authors: Bong-yeol Yeom, Behnam Pourdeyhimi

    Abstract:

    The bicomponent spunbonding technology offers high productivity and provides great flexibility in the selection of polymer compositions and fiber configurations. This process was utilized to develop islands-in-the-sea (INS) fabrics consisting of 75% nylon-6 islands and 25% PE sea polymer. The number of islands was varied from 1 (sheath-core) to 108. These webs were hydroentangled at high pressure to cause fracture and fibrillation of the sea polymer and to “release” the islands to form hybrid micro and nanofiber structures. Physical properties as well as Aerosol Filtration characteristics of these webs were investigated to determine their feasibility for Aerosol Filtration. The submicron-sized dioctyl phthalate (DOP) particles were used as a challenging Aerosol at face velocities in range of 3.3–11.7 cm/s. The Filtration efficiency of the webs followed typical behavior for fibrous Filtration media in which the most penetration particle size was in range of 0.2–0.3 micron. Surprisingly, the 1 INS web exhibited a higher quality factor compared with other INS webs due to its lower solidity. Also, it was found that corona charging improved the Filtration efficiency of 1 INS web 4.3 times compared to discharged webs for 0.2 micron of DOP particles at the face velocity of 5.3 cm/s.

Bong-yeol Yeom – One of the best experts on this subject based on the ideXlab platform.

  • Aerosol Filtration properties of nucleating agent containing electret filters
    Polymer Engineering & Science, 2013
    Co-Authors: Ali Kilic, Behnam Pourdeyhimi, Eunkyoung Shim, Bong-yeol Yeom

    Abstract:

    This study reports on the effects of nucleating agents on morphology, charging, and electrostatic Filtration performance of polypropylene meltblown webs. Two commercial nucleating agents, DMDBS (3:2, 4-bis(3,4-dimethyldibenzylidene) sorbitol) and NA11 (sodium 2,2′-methylene-bis(4,6-di-tertbutylphenyl)-phosphate) were compared. It is hypothesized that faster solidification brought about by the addition of the nucleating agents may be responsible for the slight increase in fiber diameter and concomitant reduction in web solidity. Samples were charged at room temperature as well as at elevated temperatures. Upon thermal charging, significant enhancement in the electrostatic potential and Filtration performance of the webs was observed. Particularly, the stability of electrostatic Filtration performance was found to be promising with the addition of these polarizable additives. Dielectric spectroscopy tests confirmed an increase in capacitance for samples containing nucleating agents. POLYM. ENG. SCI., 54:1533–1539, 2014. © 2013 Society of Plastics Engineers

  • Aerosol Filtration properties of PA6/PE islands-in-the-sea bicomponent spunbond web fibrillated by high-pressure water jets
    Journal of Materials Science, 2011
    Co-Authors: Bong-yeol Yeom, Behnam Pourdeyhimi

    Abstract:

    The bicomponent spunbonding technology offers high productivity and provides great flexibility in the selection of polymer compositions and fiber configurations. This process was utilized to develop islands-in-the-sea (INS) fabrics consisting of 75% nylon-6 islands and 25% PE sea polymer. The number of islands was varied from 1 (sheath-core) to 108. These webs were hydroentangled at high pressure to cause fracture and fibrillation of the sea polymer and to “release” the islands to form hybrid micro and nanofiber structures. Physical properties as well as Aerosol Filtration characteristics of these webs were investigated to determine their feasibility for Aerosol Filtration. The submicron-sized dioctyl phthalate (DOP) particles were used as a challenging Aerosol at face velocities in range of 3.3–11.7 cm/s. The Filtration efficiency of the webs followed typical behavior for fibrous Filtration media in which the most penetration particle size was in range of 0.2–0.3 micron. Surprisingly, the 1 INS web exhibited a higher quality factor compared with other INS webs due to its lower solidity. Also, it was found that corona charging improved the Filtration efficiency of 1 INS web 4.3 times compared to discharged webs for 0.2 micron of DOP particles at the face velocity of 5.3 cm/s.

  • Aerosol Filtration properties of pa6 pe islands in the sea bicomponent spunbond web fibrillated by high pressure water jets
    Journal of Materials Science, 2011
    Co-Authors: Bong-yeol Yeom, Behnam Pourdeyhimi

    Abstract:

    The bicomponent spunbonding technology offers high productivity and provides great flexibility in the selection of polymer compositions and fiber configurations. This process was utilized to develop islands-in-the-sea (INS) fabrics consisting of 75% nylon-6 islands and 25% PE sea polymer. The number of islands was varied from 1 (sheath-core) to 108. These webs were hydroentangled at high pressure to cause fracture and fibrillation of the sea polymer and to “release” the islands to form hybrid micro and nanofiber structures. Physical properties as well as Aerosol Filtration characteristics of these webs were investigated to determine their feasibility for Aerosol Filtration. The submicron-sized dioctyl phthalate (DOP) particles were used as a challenging Aerosol at face velocities in range of 3.3–11.7 cm/s. The Filtration efficiency of the webs followed typical behavior for fibrous Filtration media in which the most penetration particle size was in range of 0.2–0.3 micron. Surprisingly, the 1 INS web exhibited a higher quality factor compared with other INS webs due to its lower solidity. Also, it was found that corona charging improved the Filtration efficiency of 1 INS web 4.3 times compared to discharged webs for 0.2 micron of DOP particles at the face velocity of 5.3 cm/s.

Weihong Xing – One of the best experts on this subject based on the ideXlab platform.

  • Amphiphobic PFTMS@nano-SiO2/ePTFE Membrane for Oil Aerosol Removal
    Industrial & Engineering Chemistry Research, 2018
    Co-Authors: Fang Jian, Ze Xian Low, Shasha Feng, Zhaoxiang Zhong, Weihong Xing

    Abstract:

    Synthetic expanded polytetrafluoroethylene (ePTFE) membrane has a wide range of applications, including Aerosol and dust removal, and exhibits high dust-removing efficiency, high air permeability, and cost-effectiveness. However, the intrinsic oleophilic surface of ePTFE limits its application in the oil-bearing gas–solid separation process. Herein, we report a surface modification method to prepare amphiphobic ePTFE membranes via coating of a layer of 1H,1H,2H,2H-perfluorooctyltrimethoxysilane (PFTMS) – modified nano-SiO2 onto the surface of ePTFE fibers. The oil contact angle of the modified ePTFE membranes was increased from 0 to 123°, while retaining the initial water contact angle of 142°. The amphiphobic membrane shows excellent oil Aerosol Filtration efficiency with a comparative low pressure drop and high oil rejection rate of 99.5%. Remarkably, the membrane can be reused after simple rinsing with water. The oil Aerosol Filtration efficiency of membrane remained as high as 98.5% after five cycles …

  • Amphiphobic PFTMS@nano-SiO2/ePTFE Membrane
    for Oil Aerosol Removal
    , 2018
    Co-Authors: Jian Fang, Shasha Feng, Ze Xian Low, Zhaoxiang Zhong, Weihong Xing

    Abstract:

    Synthetic
    expanded polytetrafluoroethylene (ePTFE) membrane has
    a wide range of applications, including Aerosol and dust removal,
    and exhibits high dust-removing efficiency, high air permeability,
    and cost-effectiveness. However, the intrinsic oleophilic surface
    of ePTFE limits its application in the oil-bearing gas–solid
    separation process. Herein, we report a surface modification method
    to prepare amphiphobic ePTFE membranes via coating of a layer of 1H,1H,2H,2H-perfluorooctyltrimethoxysilane
    (PFTMS) – modified nano-SiO2 onto the surface of
    ePTFE fibers. The oil contact angle of the modified ePTFE membranes
    was increased from 0 to 123°, while retaining the initial water
    contact angle of 142°. The amphiphobic membrane shows excellent
    oil Aerosol Filtration efficiency with a comparative low pressure
    drop and high oil rejection rate of 99.5%. Remarkably, the membrane
    can be reused after simple rinsing with water. The oil Aerosol Filtration
    efficiency of membrane remained as high as 98.5% after five cycles
    of Filtration and cleaning