The Experts below are selected from a list of 10992 Experts worldwide ranked by ideXlab platform

Maryam Zare - One of the best experts on this subject based on the ideXlab platform.

  • Morphology Analysis and Characterization of Clinoptilolite/Polyvinylpyrrolidone-Zeolite Composite Nanofibers
    Journal of Materials Engineering and Performance, 2020
    Co-Authors: Ehsan Assar, Amirhossein Meysami, Maryam Zare
    Abstract:

    In this study, clinoptilolite/PVP (Polyvinyl pyrrolidone)-zeolite composite nanofibers were synthesized using the Electrospinning method. The effects of process parameters including Solution concentration, spinning voltage, and spinning distance were examined on morphology and fibers diameter. Electrospun nanofibers were studied by scanning electron microscope (SEM), x-ray diffraction (XRD), and BET method. SEM images have demonstrated the steady and straight ribbon-shaped fiber from Electrospinning Solution with 1.8:1.8:6.4 weight ratio of clinoptilolite:PVP:ethanol, respectively. It resulted that the diameter of fabricated nanofibers is about 182 nm at 1.8:1.8:6.4 weight ratios of clinoptilolite:PVP:ethanol at a 20 cm distance and 13 kV voltage as optimal parameters. The average of fibers diameter reduced following the increase in Electrospinning distance. By increasing voltage, the average of fiber diameter decreased in 15 cm distance and increased in 20 cm distance. XRD results for both particles and electrospun nanofibers show the clinoptilolite-Ca structure. The BET surface areas are measured to be 20 and 5 m^2 g^−1 for clinoptilolite particles and clinoptilolite/PVP electrospun nanofibers, respectively. Also, BET analysis showed that mesoporosity of clinoptilolite particles was preserved after putting nanoparticles inside the polymer nanofibers.

  • Morphology Analysis and Characterization of Clinoptilolite/Polyvinylpyrrolidone-Zeolite Composite Nanofibers
    Journal of Materials Engineering and Performance, 2020
    Co-Authors: Ehsan Assar, Amirhossein Meysami, Maryam Zare
    Abstract:

    In this study, clinoptilolite/PVP (Polyvinyl pyrrolidone)-zeolite composite nanofibers were synthesized using the Electrospinning method. The effects of process parameters including Solution concentration, spinning voltage, and spinning distance were examined on morphology and fibers diameter. Electrospun nanofibers were studied by scanning electron microscope (SEM), x-ray diffraction (XRD), and BET method. SEM images have demonstrated the steady and straight ribbon-shaped fiber from Electrospinning Solution with 1.8:1.8:6.4 weight ratio of clinoptilolite:PVP:ethanol, respectively. It resulted that the diameter of fabricated nanofibers is about 182 nm at 1.8:1.8:6.4 weight ratios of clinoptilolite:PVP:ethanol at a 20 cm distance and 13 kV voltage as optimal parameters. The average of fibers diameter reduced following the increase in Electrospinning distance. By increasing voltage, the average of fiber diameter decreased in 15 cm distance and increased in 20 cm distance. XRD results for both particles and electrospun nanofibers show the clinoptilolite-Ca structure. The BET surface areas are measured to be 20 and 5 m^2 g^−1 for clinoptilolite particles and clinoptilolite/PVP electrospun nanofibers, respectively. Also, BET analysis showed that mesoporosity of clinoptilolite particles was preserved after putting nanoparticles inside the polymer nanofibers.

Peggy Cebe - One of the best experts on this subject based on the ideXlab platform.

  • crystal polymorphism in electrospun composite nanofibers of poly vinylidene fluoride with nanoclay
    Polymer, 2009
    Co-Authors: Lei Yu, Peggy Cebe
    Abstract:

    Abstract We investigated for the first time the morphology and crystal polymorphism of electrospun composite nanofibers of poly(vinylidene fluoride) (PVDF) with two nanoclays: Lucentite™ STN and SWN. Both nanoclays are based on the hectorite structure, but STN has organic modifier in between the layers of hectorite while SWN does not. PVDF/nanoclay was dissolved in N , N -dimethylformamide/acetone and electrospun into composite nanofiber mats with fiber diameters ranging from 50–800 nm. Scanning electron microscopy shows that addition of STN and SWN can greatly decrease the number of beads and make the diameter of the nanofibers more uniform due to the increase of Electrospinning Solution conductivity brought by the nanoclay. Infrared spectroscopy and X-ray diffraction confirm that both STN and SWN can induce more extended PVDF chain conformers, found in beta and gamma phase, while reducing the alpha phase conformers in electrospun PVDF/Nanoclay composite nanofibers. With the attached organic modifier, even a small amount of STN can totally eliminate the non-polar alpha crystal conformers while SWN cannot. The ionic organic modifier makes STN much more effective than SWN in causing crystallization of the polar beta and gamma phases of PVDF. An ion–dipole interaction mechanism, suggested by Ramasundaram, et al. is utilized to explain the crystal polymorphism behavior in electrospun PVDF/nanoclay composite nanofibers.

Ehsan Assar - One of the best experts on this subject based on the ideXlab platform.

  • Morphology Analysis and Characterization of Clinoptilolite/Polyvinylpyrrolidone-Zeolite Composite Nanofibers
    Journal of Materials Engineering and Performance, 2020
    Co-Authors: Ehsan Assar, Amirhossein Meysami, Maryam Zare
    Abstract:

    In this study, clinoptilolite/PVP (Polyvinyl pyrrolidone)-zeolite composite nanofibers were synthesized using the Electrospinning method. The effects of process parameters including Solution concentration, spinning voltage, and spinning distance were examined on morphology and fibers diameter. Electrospun nanofibers were studied by scanning electron microscope (SEM), x-ray diffraction (XRD), and BET method. SEM images have demonstrated the steady and straight ribbon-shaped fiber from Electrospinning Solution with 1.8:1.8:6.4 weight ratio of clinoptilolite:PVP:ethanol, respectively. It resulted that the diameter of fabricated nanofibers is about 182 nm at 1.8:1.8:6.4 weight ratios of clinoptilolite:PVP:ethanol at a 20 cm distance and 13 kV voltage as optimal parameters. The average of fibers diameter reduced following the increase in Electrospinning distance. By increasing voltage, the average of fiber diameter decreased in 15 cm distance and increased in 20 cm distance. XRD results for both particles and electrospun nanofibers show the clinoptilolite-Ca structure. The BET surface areas are measured to be 20 and 5 m^2 g^−1 for clinoptilolite particles and clinoptilolite/PVP electrospun nanofibers, respectively. Also, BET analysis showed that mesoporosity of clinoptilolite particles was preserved after putting nanoparticles inside the polymer nanofibers.

  • Morphology Analysis and Characterization of Clinoptilolite/Polyvinylpyrrolidone-Zeolite Composite Nanofibers
    Journal of Materials Engineering and Performance, 2020
    Co-Authors: Ehsan Assar, Amirhossein Meysami, Maryam Zare
    Abstract:

    In this study, clinoptilolite/PVP (Polyvinyl pyrrolidone)-zeolite composite nanofibers were synthesized using the Electrospinning method. The effects of process parameters including Solution concentration, spinning voltage, and spinning distance were examined on morphology and fibers diameter. Electrospun nanofibers were studied by scanning electron microscope (SEM), x-ray diffraction (XRD), and BET method. SEM images have demonstrated the steady and straight ribbon-shaped fiber from Electrospinning Solution with 1.8:1.8:6.4 weight ratio of clinoptilolite:PVP:ethanol, respectively. It resulted that the diameter of fabricated nanofibers is about 182 nm at 1.8:1.8:6.4 weight ratios of clinoptilolite:PVP:ethanol at a 20 cm distance and 13 kV voltage as optimal parameters. The average of fibers diameter reduced following the increase in Electrospinning distance. By increasing voltage, the average of fiber diameter decreased in 15 cm distance and increased in 20 cm distance. XRD results for both particles and electrospun nanofibers show the clinoptilolite-Ca structure. The BET surface areas are measured to be 20 and 5 m^2 g^−1 for clinoptilolite particles and clinoptilolite/PVP electrospun nanofibers, respectively. Also, BET analysis showed that mesoporosity of clinoptilolite particles was preserved after putting nanoparticles inside the polymer nanofibers.

Amirhossein Meysami - One of the best experts on this subject based on the ideXlab platform.

  • Morphology Analysis and Characterization of Clinoptilolite/Polyvinylpyrrolidone-Zeolite Composite Nanofibers
    Journal of Materials Engineering and Performance, 2020
    Co-Authors: Ehsan Assar, Amirhossein Meysami, Maryam Zare
    Abstract:

    In this study, clinoptilolite/PVP (Polyvinyl pyrrolidone)-zeolite composite nanofibers were synthesized using the Electrospinning method. The effects of process parameters including Solution concentration, spinning voltage, and spinning distance were examined on morphology and fibers diameter. Electrospun nanofibers were studied by scanning electron microscope (SEM), x-ray diffraction (XRD), and BET method. SEM images have demonstrated the steady and straight ribbon-shaped fiber from Electrospinning Solution with 1.8:1.8:6.4 weight ratio of clinoptilolite:PVP:ethanol, respectively. It resulted that the diameter of fabricated nanofibers is about 182 nm at 1.8:1.8:6.4 weight ratios of clinoptilolite:PVP:ethanol at a 20 cm distance and 13 kV voltage as optimal parameters. The average of fibers diameter reduced following the increase in Electrospinning distance. By increasing voltage, the average of fiber diameter decreased in 15 cm distance and increased in 20 cm distance. XRD results for both particles and electrospun nanofibers show the clinoptilolite-Ca structure. The BET surface areas are measured to be 20 and 5 m^2 g^−1 for clinoptilolite particles and clinoptilolite/PVP electrospun nanofibers, respectively. Also, BET analysis showed that mesoporosity of clinoptilolite particles was preserved after putting nanoparticles inside the polymer nanofibers.

  • Morphology Analysis and Characterization of Clinoptilolite/Polyvinylpyrrolidone-Zeolite Composite Nanofibers
    Journal of Materials Engineering and Performance, 2020
    Co-Authors: Ehsan Assar, Amirhossein Meysami, Maryam Zare
    Abstract:

    In this study, clinoptilolite/PVP (Polyvinyl pyrrolidone)-zeolite composite nanofibers were synthesized using the Electrospinning method. The effects of process parameters including Solution concentration, spinning voltage, and spinning distance were examined on morphology and fibers diameter. Electrospun nanofibers were studied by scanning electron microscope (SEM), x-ray diffraction (XRD), and BET method. SEM images have demonstrated the steady and straight ribbon-shaped fiber from Electrospinning Solution with 1.8:1.8:6.4 weight ratio of clinoptilolite:PVP:ethanol, respectively. It resulted that the diameter of fabricated nanofibers is about 182 nm at 1.8:1.8:6.4 weight ratios of clinoptilolite:PVP:ethanol at a 20 cm distance and 13 kV voltage as optimal parameters. The average of fibers diameter reduced following the increase in Electrospinning distance. By increasing voltage, the average of fiber diameter decreased in 15 cm distance and increased in 20 cm distance. XRD results for both particles and electrospun nanofibers show the clinoptilolite-Ca structure. The BET surface areas are measured to be 20 and 5 m^2 g^−1 for clinoptilolite particles and clinoptilolite/PVP electrospun nanofibers, respectively. Also, BET analysis showed that mesoporosity of clinoptilolite particles was preserved after putting nanoparticles inside the polymer nanofibers.

Lei Yu - One of the best experts on this subject based on the ideXlab platform.

  • crystal polymorphism in electrospun composite nanofibers of poly vinylidene fluoride with nanoclay
    Polymer, 2009
    Co-Authors: Lei Yu, Peggy Cebe
    Abstract:

    Abstract We investigated for the first time the morphology and crystal polymorphism of electrospun composite nanofibers of poly(vinylidene fluoride) (PVDF) with two nanoclays: Lucentite™ STN and SWN. Both nanoclays are based on the hectorite structure, but STN has organic modifier in between the layers of hectorite while SWN does not. PVDF/nanoclay was dissolved in N , N -dimethylformamide/acetone and electrospun into composite nanofiber mats with fiber diameters ranging from 50–800 nm. Scanning electron microscopy shows that addition of STN and SWN can greatly decrease the number of beads and make the diameter of the nanofibers more uniform due to the increase of Electrospinning Solution conductivity brought by the nanoclay. Infrared spectroscopy and X-ray diffraction confirm that both STN and SWN can induce more extended PVDF chain conformers, found in beta and gamma phase, while reducing the alpha phase conformers in electrospun PVDF/Nanoclay composite nanofibers. With the attached organic modifier, even a small amount of STN can totally eliminate the non-polar alpha crystal conformers while SWN cannot. The ionic organic modifier makes STN much more effective than SWN in causing crystallization of the polar beta and gamma phases of PVDF. An ion–dipole interaction mechanism, suggested by Ramasundaram, et al. is utilized to explain the crystal polymorphism behavior in electrospun PVDF/nanoclay composite nanofibers.