The Experts below are selected from a list of 4518 Experts worldwide ranked by ideXlab platform
Akira Isogai - One of the best experts on this subject based on the ideXlab platform.
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Pore Size Determination of tempo oxidized cellulose nanofibril films by positron annihilation lifetime spectroscopy
Biomacromolecules, 2011Co-Authors: Hayaka Fukuzumi, Tsuguyuki Saito, Shinichiro Iwamoto, Yoshiaki Kumamoto, T Ohdaira, Ryoichi Suzuki, Akira IsogaiAbstract:Wood cellulose nanofibril films with sodium carboxylate groups prepared from a 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized pulp exhibited an extremely low oxygen permeability of 0.0008 mL μm m–2 day–1 kPa–1 at 0% relative humidity (RH). Positron annihilation lifetime spectroscopy (PALS) was used to determine the Pore Sizes in wood and tunicate TEMPO-oxidized cellulose nanofibril (TOCN-COONa) films in a vacuum (i.e., at 0% RH). PALS analysis revealed that the Pore Size of the wood TOCN-COONa films remained nearly at 0.47 nm from the film surface to the interior of the film. This is probably the cause of this high oxygen-barrier properties at 0% RH. The crystalline structure of TOCN-COONa also contributes to the high oxygen-barrier properties of the wood TOCN-COONa films. However, the oxygen permeability of the wood TOCN-COONa films increased to 0.17 mL μm m–2 day–1 kPa–1 at 50% RH, which is one of the shortcomings of hydrophilic TOCN-COONa films.
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Pore Size Determination of tempo oxidized cellulose nanofibril films by positron annihilation lifetime spectroscopy
Biomacromolecules, 2011Co-Authors: Hayaka Fukuzumi, Tsuguyuki Saito, Shinichiro Iwamoto, Yoshiaki Kumamoto, T Ohdaira, Ryoichi Suzuki, Akira IsogaiAbstract:Wood cellulose nanofibril films with sodium carboxylate groups prepared from a 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized pulp exhibited an extremely low oxygen permeability of 0.0008 mL μm m–2 day–1 kPa–1 at 0% relative humidity (RH). Positron annihilation lifetime spectroscopy (PALS) was used to determine the Pore Sizes in wood and tunicate TEMPO-oxidized cellulose nanofibril (TOCN-COONa) films in a vacuum (i.e., at 0% RH). PALS analysis revealed that the Pore Size of the wood TOCN-COONa films remained nearly at 0.47 nm from the film surface to the interior of the film. This is probably the cause of this high oxygen-barrier properties at 0% RH. The crystalline structure of TOCN-COONa also contributes to the high oxygen-barrier properties of the wood TOCN-COONa films. However, the oxygen permeability of the wood TOCN-COONa films increased to 0.17 mL μm m–2 day–1 kPa–1 at 50% RH, which is one of the shortcomings of hydrophilic TOCN-COONa films.
Petr Uchytil - One of the best experts on this subject based on the ideXlab platform.
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Pore-Size Determination in the separation layer of a ceramic membrane using the permeation method
Journal of Materials Science, 1996Co-Authors: Petr UchytilAbstract:Results of the Determination of the structure parameters of separation layers of ceramic membranes (made of the support and coated by one separation layer) by the gas permeation method are presented. Simultaneously, the difference between the gas flow rate in two orientations (from the separation layer to the support, and vice versa) has been experimentally verified.
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Possibility of Pore Size Determination in separation layer of ceramic membrane using permeation method
Journal of Membrane Science, 1995Co-Authors: Petr Uchytil, Zdeněk Wagner, Josef Roček, Zdeněk BrožAbstract:Utilization of the mathematical model of gas permeation through a ceramic membrane consisting of a support and one separation layer is presented. The influence of errors in measured variables upon reliability of Determination of structure parameters of the separation layer is discussed. The usability of the permeation method for the Pore Size Determination was verified by fitting computer generated pseudoexperimental data with Gaussian distribution and preselected variance. All calculations were performed for hydrogen but results for other gases will be similar.
Hayaka Fukuzumi - One of the best experts on this subject based on the ideXlab platform.
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Pore Size Determination of tempo oxidized cellulose nanofibril films by positron annihilation lifetime spectroscopy
Biomacromolecules, 2011Co-Authors: Hayaka Fukuzumi, Tsuguyuki Saito, Shinichiro Iwamoto, Yoshiaki Kumamoto, T Ohdaira, Ryoichi Suzuki, Akira IsogaiAbstract:Wood cellulose nanofibril films with sodium carboxylate groups prepared from a 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized pulp exhibited an extremely low oxygen permeability of 0.0008 mL μm m–2 day–1 kPa–1 at 0% relative humidity (RH). Positron annihilation lifetime spectroscopy (PALS) was used to determine the Pore Sizes in wood and tunicate TEMPO-oxidized cellulose nanofibril (TOCN-COONa) films in a vacuum (i.e., at 0% RH). PALS analysis revealed that the Pore Size of the wood TOCN-COONa films remained nearly at 0.47 nm from the film surface to the interior of the film. This is probably the cause of this high oxygen-barrier properties at 0% RH. The crystalline structure of TOCN-COONa also contributes to the high oxygen-barrier properties of the wood TOCN-COONa films. However, the oxygen permeability of the wood TOCN-COONa films increased to 0.17 mL μm m–2 day–1 kPa–1 at 50% RH, which is one of the shortcomings of hydrophilic TOCN-COONa films.
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Pore Size Determination of tempo oxidized cellulose nanofibril films by positron annihilation lifetime spectroscopy
Biomacromolecules, 2011Co-Authors: Hayaka Fukuzumi, Tsuguyuki Saito, Shinichiro Iwamoto, Yoshiaki Kumamoto, T Ohdaira, Ryoichi Suzuki, Akira IsogaiAbstract:Wood cellulose nanofibril films with sodium carboxylate groups prepared from a 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized pulp exhibited an extremely low oxygen permeability of 0.0008 mL μm m–2 day–1 kPa–1 at 0% relative humidity (RH). Positron annihilation lifetime spectroscopy (PALS) was used to determine the Pore Sizes in wood and tunicate TEMPO-oxidized cellulose nanofibril (TOCN-COONa) films in a vacuum (i.e., at 0% RH). PALS analysis revealed that the Pore Size of the wood TOCN-COONa films remained nearly at 0.47 nm from the film surface to the interior of the film. This is probably the cause of this high oxygen-barrier properties at 0% RH. The crystalline structure of TOCN-COONa also contributes to the high oxygen-barrier properties of the wood TOCN-COONa films. However, the oxygen permeability of the wood TOCN-COONa films increased to 0.17 mL μm m–2 day–1 kPa–1 at 50% RH, which is one of the shortcomings of hydrophilic TOCN-COONa films.
T Ohdaira - One of the best experts on this subject based on the ideXlab platform.
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Pore Size Determination of tempo oxidized cellulose nanofibril films by positron annihilation lifetime spectroscopy
Biomacromolecules, 2011Co-Authors: Hayaka Fukuzumi, Tsuguyuki Saito, Shinichiro Iwamoto, Yoshiaki Kumamoto, T Ohdaira, Ryoichi Suzuki, Akira IsogaiAbstract:Wood cellulose nanofibril films with sodium carboxylate groups prepared from a 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized pulp exhibited an extremely low oxygen permeability of 0.0008 mL μm m–2 day–1 kPa–1 at 0% relative humidity (RH). Positron annihilation lifetime spectroscopy (PALS) was used to determine the Pore Sizes in wood and tunicate TEMPO-oxidized cellulose nanofibril (TOCN-COONa) films in a vacuum (i.e., at 0% RH). PALS analysis revealed that the Pore Size of the wood TOCN-COONa films remained nearly at 0.47 nm from the film surface to the interior of the film. This is probably the cause of this high oxygen-barrier properties at 0% RH. The crystalline structure of TOCN-COONa also contributes to the high oxygen-barrier properties of the wood TOCN-COONa films. However, the oxygen permeability of the wood TOCN-COONa films increased to 0.17 mL μm m–2 day–1 kPa–1 at 50% RH, which is one of the shortcomings of hydrophilic TOCN-COONa films.
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Pore Size Determination of tempo oxidized cellulose nanofibril films by positron annihilation lifetime spectroscopy
Biomacromolecules, 2011Co-Authors: Hayaka Fukuzumi, Tsuguyuki Saito, Shinichiro Iwamoto, Yoshiaki Kumamoto, T Ohdaira, Ryoichi Suzuki, Akira IsogaiAbstract:Wood cellulose nanofibril films with sodium carboxylate groups prepared from a 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized pulp exhibited an extremely low oxygen permeability of 0.0008 mL μm m–2 day–1 kPa–1 at 0% relative humidity (RH). Positron annihilation lifetime spectroscopy (PALS) was used to determine the Pore Sizes in wood and tunicate TEMPO-oxidized cellulose nanofibril (TOCN-COONa) films in a vacuum (i.e., at 0% RH). PALS analysis revealed that the Pore Size of the wood TOCN-COONa films remained nearly at 0.47 nm from the film surface to the interior of the film. This is probably the cause of this high oxygen-barrier properties at 0% RH. The crystalline structure of TOCN-COONa also contributes to the high oxygen-barrier properties of the wood TOCN-COONa films. However, the oxygen permeability of the wood TOCN-COONa films increased to 0.17 mL μm m–2 day–1 kPa–1 at 50% RH, which is one of the shortcomings of hydrophilic TOCN-COONa films.
Tsuguyuki Saito - One of the best experts on this subject based on the ideXlab platform.
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Pore Size Determination of tempo oxidized cellulose nanofibril films by positron annihilation lifetime spectroscopy
Biomacromolecules, 2011Co-Authors: Hayaka Fukuzumi, Tsuguyuki Saito, Shinichiro Iwamoto, Yoshiaki Kumamoto, T Ohdaira, Ryoichi Suzuki, Akira IsogaiAbstract:Wood cellulose nanofibril films with sodium carboxylate groups prepared from a 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized pulp exhibited an extremely low oxygen permeability of 0.0008 mL μm m–2 day–1 kPa–1 at 0% relative humidity (RH). Positron annihilation lifetime spectroscopy (PALS) was used to determine the Pore Sizes in wood and tunicate TEMPO-oxidized cellulose nanofibril (TOCN-COONa) films in a vacuum (i.e., at 0% RH). PALS analysis revealed that the Pore Size of the wood TOCN-COONa films remained nearly at 0.47 nm from the film surface to the interior of the film. This is probably the cause of this high oxygen-barrier properties at 0% RH. The crystalline structure of TOCN-COONa also contributes to the high oxygen-barrier properties of the wood TOCN-COONa films. However, the oxygen permeability of the wood TOCN-COONa films increased to 0.17 mL μm m–2 day–1 kPa–1 at 50% RH, which is one of the shortcomings of hydrophilic TOCN-COONa films.
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Pore Size Determination of tempo oxidized cellulose nanofibril films by positron annihilation lifetime spectroscopy
Biomacromolecules, 2011Co-Authors: Hayaka Fukuzumi, Tsuguyuki Saito, Shinichiro Iwamoto, Yoshiaki Kumamoto, T Ohdaira, Ryoichi Suzuki, Akira IsogaiAbstract:Wood cellulose nanofibril films with sodium carboxylate groups prepared from a 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized pulp exhibited an extremely low oxygen permeability of 0.0008 mL μm m–2 day–1 kPa–1 at 0% relative humidity (RH). Positron annihilation lifetime spectroscopy (PALS) was used to determine the Pore Sizes in wood and tunicate TEMPO-oxidized cellulose nanofibril (TOCN-COONa) films in a vacuum (i.e., at 0% RH). PALS analysis revealed that the Pore Size of the wood TOCN-COONa films remained nearly at 0.47 nm from the film surface to the interior of the film. This is probably the cause of this high oxygen-barrier properties at 0% RH. The crystalline structure of TOCN-COONa also contributes to the high oxygen-barrier properties of the wood TOCN-COONa films. However, the oxygen permeability of the wood TOCN-COONa films increased to 0.17 mL μm m–2 day–1 kPa–1 at 50% RH, which is one of the shortcomings of hydrophilic TOCN-COONa films.