The Experts below are selected from a list of 5778 Experts worldwide ranked by ideXlab platform
Tokuji Miyashita - One of the best experts on this subject based on the ideXlab platform.
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Surface wettability of amphiphilic Fluorinated Polymer thin films
Polymer Bulletin, 2016Co-Authors: Yu Gao, Tokuji Miyashita, Huie Zhu, Shunsuke Yamamoto, Masaya MitsuishiAbstract:The surface wettability of amphiphilic Fluorinated Polymer poly( N -1 H ,1 H -pentadecafluorooctylmethacrylamide), (pC7F15MAA) films was investigated. Nanostructured Fluorinated Polymer pC7F15MAA films were prepared using two bottom-up methods: Langmuir–Blodgett technique and dropcasting. The pC7F15MAA LB films show quite smooth surfaces as low as the surface roughness of 1.16 nm, and the surface has a water contact angle (WCA) of 118°, indicating that the surface is occupied by the CF_3 groups. Dropcasting provides pC7F15MAA nanoparticle assemblies with the surface roughness of 230 nm and a WCA of 163°. Results imply that bottom-up approaches with amphiphilic Fluorinated Polymer are effective to construct nanostructures, thereby controlling the surface wettability.
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Amphiphilic Fluorinated Polymer Nanoparticle Film Formation and Dissolved Oxygen Sensing Application
Journal of Physics: Conference Series, 2016Co-Authors: Yu Gao, Tokuji Miyashita, Huie Zhu, Shunsuke Yamamoto, Masaya MitsuishiAbstract:Fluorinated Polymer nanoparticle films were prepared by dissolving amphiphilic Fluorinated Polymer, poly (N-1H, 1H-pentadecafluorooctylmethacrylamide) (pC7F15MAA) in two miscible solvents (AK-225 and acetic acid). A superhydrophobic and porous film was obtained by dropcasting the solution on substrates. With higher ratios of AK-225 to acetic acid, pC7F15MAA was densified around acetic acid droplets, leading to the formation of pC7F15MAA nanoparticles. The condition of the nanoparticle film preparation was investigated by varying the mixing ratio or total concentration. A highly sensitive dissolved oxygen sensor system was successfully prepared utilizing a smart surface of superhydrophobic and porous pC7F15MAA nanoparticle film. The sensitivity showed I0/I40 = 126 in the range of dissolved oxygen concentration of 0 ~ 40 mg L-1. The oxygen sensitivity was compared with that of previous reports.
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Fabrication of Fluorinated Polymer nanosheets using the Langmuir–Blodgett technique: characterization of their surface properties and applications
Polymer International, 2010Co-Authors: Mohammod Aminuzzaman, Masaya Mitsuishi, Tokuji MiyashitaAbstract:This review describes the bottom-up design of ultra-thin Fluorinated Polymer films. Fluorinated Polymer assemblies offer unique and application-oriented properties strongly correlated with surface chemistry. We focus on our recent topic of research, Fluorinated Polymer nanosheets, which are ultra-thin Polymer films fabricated from amphiphilic Fluorinated polyalkylacrylamides using the elegant Langmuir–Blodgett technique. These Fluorinated Polymer nanosheets have excellent hydrophobicity, extremely low surface energy and a low friction coefficient. Therefore, Fluorinated Polymer nanosheets are attractive nanomaterials for surface modification in terms of tailoring of wettability, frictional properties, adhesion and surface chemistry. The nanocoating technique using reactive Fluorinated Polymer nanosheets and surface modification of hard disks and microchannels are also reviewed. Copyright © 2010 Society of Chemical Industry
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Surface modification of a flexible polyimide film using a reactive Fluorinated Polymer nanosheet
Thin Solid Films, 2010Co-Authors: Mohammod Aminuzzaman, Masaya Mitsuishi, Tokuji MiyashitaAbstract:Abstract This paper describes an effective approach to surface modification of a flexible polyimide film using a reactive Fluorinated Polymer nanosheet. N-(1H,1H-pentadecafluorooctyl)methacrylamide coPolymers containing carboxyl group as a reactive moiety form stable monolayer on the water surface and highly ordered reactive Polymer nanosheets can be fabricated by the Langmuir–Blodgett technique. This reactive Fluorinated Polymer nanosheet was utilized to modify the surface properties of polyimide film through its immobilization using thermal treatment. The modification process was studied by X-ray photoelectron spectroscopy (XPS) and modified PI surface was characterized by contact angle measurements and atomic force microscopy (AFM).
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Frictional properties of an immobilized Fluorinated Polymer nanosheet
Thin Solid Films, 2007Co-Authors: Mohammod Aminuzzaman, Masaya Mitsuishi, Yuko Kado, Tokuji MiyashitaAbstract:Abstract The frictional properties of an immobilized Fluorinated Polymer nanosheet were investigated to develop an ultrathin solid lubrication film with an excellent wear-resistant. N -(1 H ,1 H -Pentadecafluorooctylmethacrylamide) coPolymers containing carboxyl group as a reactive moiety form a stable monolayer on the water surface and a highly ordered reactive Fluorinated Polymer nanosheet can be fabricated by the Langmuir–Blodgett technique. The reactive Fluorinated Polymer nanosheet was immobilized onto solid substrates through chemical binding with an aminosilane coupling agent, and the film showed smooth surface even after the reaction. The immobilized Fluorinated Polymer nanosheet had a low friction coefficient and strong wear-resistant.
Masaya Mitsuishi - One of the best experts on this subject based on the ideXlab platform.
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Surface wettability of amphiphilic Fluorinated Polymer thin films
Polymer Bulletin, 2016Co-Authors: Yu Gao, Tokuji Miyashita, Huie Zhu, Shunsuke Yamamoto, Masaya MitsuishiAbstract:The surface wettability of amphiphilic Fluorinated Polymer poly( N -1 H ,1 H -pentadecafluorooctylmethacrylamide), (pC7F15MAA) films was investigated. Nanostructured Fluorinated Polymer pC7F15MAA films were prepared using two bottom-up methods: Langmuir–Blodgett technique and dropcasting. The pC7F15MAA LB films show quite smooth surfaces as low as the surface roughness of 1.16 nm, and the surface has a water contact angle (WCA) of 118°, indicating that the surface is occupied by the CF_3 groups. Dropcasting provides pC7F15MAA nanoparticle assemblies with the surface roughness of 230 nm and a WCA of 163°. Results imply that bottom-up approaches with amphiphilic Fluorinated Polymer are effective to construct nanostructures, thereby controlling the surface wettability.
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Amphiphilic Fluorinated Polymer Nanoparticle Film Formation and Dissolved Oxygen Sensing Application
Journal of Physics: Conference Series, 2016Co-Authors: Yu Gao, Tokuji Miyashita, Huie Zhu, Shunsuke Yamamoto, Masaya MitsuishiAbstract:Fluorinated Polymer nanoparticle films were prepared by dissolving amphiphilic Fluorinated Polymer, poly (N-1H, 1H-pentadecafluorooctylmethacrylamide) (pC7F15MAA) in two miscible solvents (AK-225 and acetic acid). A superhydrophobic and porous film was obtained by dropcasting the solution on substrates. With higher ratios of AK-225 to acetic acid, pC7F15MAA was densified around acetic acid droplets, leading to the formation of pC7F15MAA nanoparticles. The condition of the nanoparticle film preparation was investigated by varying the mixing ratio or total concentration. A highly sensitive dissolved oxygen sensor system was successfully prepared utilizing a smart surface of superhydrophobic and porous pC7F15MAA nanoparticle film. The sensitivity showed I0/I40 = 126 in the range of dissolved oxygen concentration of 0 ~ 40 mg L-1. The oxygen sensitivity was compared with that of previous reports.
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Fabrication of Fluorinated Polymer nanosheets using the Langmuir–Blodgett technique: characterization of their surface properties and applications
Polymer International, 2010Co-Authors: Mohammod Aminuzzaman, Masaya Mitsuishi, Tokuji MiyashitaAbstract:This review describes the bottom-up design of ultra-thin Fluorinated Polymer films. Fluorinated Polymer assemblies offer unique and application-oriented properties strongly correlated with surface chemistry. We focus on our recent topic of research, Fluorinated Polymer nanosheets, which are ultra-thin Polymer films fabricated from amphiphilic Fluorinated polyalkylacrylamides using the elegant Langmuir–Blodgett technique. These Fluorinated Polymer nanosheets have excellent hydrophobicity, extremely low surface energy and a low friction coefficient. Therefore, Fluorinated Polymer nanosheets are attractive nanomaterials for surface modification in terms of tailoring of wettability, frictional properties, adhesion and surface chemistry. The nanocoating technique using reactive Fluorinated Polymer nanosheets and surface modification of hard disks and microchannels are also reviewed. Copyright © 2010 Society of Chemical Industry
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Surface modification of a flexible polyimide film using a reactive Fluorinated Polymer nanosheet
Thin Solid Films, 2010Co-Authors: Mohammod Aminuzzaman, Masaya Mitsuishi, Tokuji MiyashitaAbstract:Abstract This paper describes an effective approach to surface modification of a flexible polyimide film using a reactive Fluorinated Polymer nanosheet. N-(1H,1H-pentadecafluorooctyl)methacrylamide coPolymers containing carboxyl group as a reactive moiety form stable monolayer on the water surface and highly ordered reactive Polymer nanosheets can be fabricated by the Langmuir–Blodgett technique. This reactive Fluorinated Polymer nanosheet was utilized to modify the surface properties of polyimide film through its immobilization using thermal treatment. The modification process was studied by X-ray photoelectron spectroscopy (XPS) and modified PI surface was characterized by contact angle measurements and atomic force microscopy (AFM).
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Frictional properties of an immobilized Fluorinated Polymer nanosheet
Thin Solid Films, 2007Co-Authors: Mohammod Aminuzzaman, Masaya Mitsuishi, Yuko Kado, Tokuji MiyashitaAbstract:Abstract The frictional properties of an immobilized Fluorinated Polymer nanosheet were investigated to develop an ultrathin solid lubrication film with an excellent wear-resistant. N -(1 H ,1 H -Pentadecafluorooctylmethacrylamide) coPolymers containing carboxyl group as a reactive moiety form a stable monolayer on the water surface and a highly ordered reactive Fluorinated Polymer nanosheet can be fabricated by the Langmuir–Blodgett technique. The reactive Fluorinated Polymer nanosheet was immobilized onto solid substrates through chemical binding with an aminosilane coupling agent, and the film showed smooth surface even after the reaction. The immobilized Fluorinated Polymer nanosheet had a low friction coefficient and strong wear-resistant.
O Savadogo - One of the best experts on this subject based on the ideXlab platform.
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emerging membranes for electrochemical systems part ii high temperature composite membranes for Polymer electrolyte fuel cell pefc applications
Journal of Power Sources, 2004Co-Authors: O SavadogoAbstract:Abstract This paper shows an exhaustive presentation and complementary discussions on various aspects of works done recently on the developments of composite membranes for Polymer electrolyte fuel cell (PEFC) applications. The limitations of per-Fluorinated Polymer electrolyte membranes to low temperature (
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emerging membranes for electrochemical systems part ii high temperature composite membranes for Polymer electrolyte fuel cell pefc applications
Journal of Power Sources, 2004Co-Authors: O SavadogoAbstract:Abstract This paper shows an exhaustive presentation and complementary discussions on various aspects of works done recently on the developments of composite membranes for Polymer electrolyte fuel cell (PEFC) applications. The limitations of per-Fluorinated Polymer electrolyte membranes to low temperature (
Mohammod Aminuzzaman - One of the best experts on this subject based on the ideXlab platform.
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Fabrication of Fluorinated Polymer nanosheets using the Langmuir–Blodgett technique: characterization of their surface properties and applications
Polymer International, 2010Co-Authors: Mohammod Aminuzzaman, Masaya Mitsuishi, Tokuji MiyashitaAbstract:This review describes the bottom-up design of ultra-thin Fluorinated Polymer films. Fluorinated Polymer assemblies offer unique and application-oriented properties strongly correlated with surface chemistry. We focus on our recent topic of research, Fluorinated Polymer nanosheets, which are ultra-thin Polymer films fabricated from amphiphilic Fluorinated polyalkylacrylamides using the elegant Langmuir–Blodgett technique. These Fluorinated Polymer nanosheets have excellent hydrophobicity, extremely low surface energy and a low friction coefficient. Therefore, Fluorinated Polymer nanosheets are attractive nanomaterials for surface modification in terms of tailoring of wettability, frictional properties, adhesion and surface chemistry. The nanocoating technique using reactive Fluorinated Polymer nanosheets and surface modification of hard disks and microchannels are also reviewed. Copyright © 2010 Society of Chemical Industry
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Surface modification of a flexible polyimide film using a reactive Fluorinated Polymer nanosheet
Thin Solid Films, 2010Co-Authors: Mohammod Aminuzzaman, Masaya Mitsuishi, Tokuji MiyashitaAbstract:Abstract This paper describes an effective approach to surface modification of a flexible polyimide film using a reactive Fluorinated Polymer nanosheet. N-(1H,1H-pentadecafluorooctyl)methacrylamide coPolymers containing carboxyl group as a reactive moiety form stable monolayer on the water surface and highly ordered reactive Polymer nanosheets can be fabricated by the Langmuir–Blodgett technique. This reactive Fluorinated Polymer nanosheet was utilized to modify the surface properties of polyimide film through its immobilization using thermal treatment. The modification process was studied by X-ray photoelectron spectroscopy (XPS) and modified PI surface was characterized by contact angle measurements and atomic force microscopy (AFM).
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Frictional properties of an immobilized Fluorinated Polymer nanosheet
Thin Solid Films, 2007Co-Authors: Mohammod Aminuzzaman, Masaya Mitsuishi, Yuko Kado, Tokuji MiyashitaAbstract:Abstract The frictional properties of an immobilized Fluorinated Polymer nanosheet were investigated to develop an ultrathin solid lubrication film with an excellent wear-resistant. N -(1 H ,1 H -Pentadecafluorooctylmethacrylamide) coPolymers containing carboxyl group as a reactive moiety form a stable monolayer on the water surface and a highly ordered reactive Fluorinated Polymer nanosheet can be fabricated by the Langmuir–Blodgett technique. The reactive Fluorinated Polymer nanosheet was immobilized onto solid substrates through chemical binding with an aminosilane coupling agent, and the film showed smooth surface even after the reaction. The immobilized Fluorinated Polymer nanosheet had a low friction coefficient and strong wear-resistant.
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Surface Modification of Microchannels with Fluorinated Polymer Langmuir-Blodgett Films
Molecular Crystals and Liquid Crystals, 2004Co-Authors: Masaya Mitsuishi, Mohammod Aminuzzaman, Masahiko Mihashi, Tokuji MiyashitaAbstract:The Langmuir-Blodgett(LB)technique was utilized to control surface properties of narrow microchannel walls at the molecular scale. Fluorinated amphiphilic Polymer(pC7F15MAA)was synthesized and its ultrathin films were prepared by the LB technique. Microchannel was fabricated with glass substrates. A laminar flow of water in hydrophilic and hydrophobic microchannels was monitored in situ using an optical microscope equipped with a digital CCD camera. Shape of meniscus was clearly monitored with 250 ms time-resolution. The Fluorinated Polymer LB film can be a good candidate to control water motion in the microchannel.
Atsuhiro Fujimori - One of the best experts on this subject based on the ideXlab platform.
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Effect of the uniaxial orientation on the Polymer/filler nanocomposites using phosphonate-modified single-walled carbon nanotube with hydro- or fluorocarbons
Polymer Bulletin, 2020Co-Authors: Takuto Hayasaki, Yoshinori Abiko, Ahmed A. Almarasy, Shuichi Akasaka, Atsuhiro FujimoriAbstract:The effect of drawn orientation on crystalline Fluorinated Polymer/carbon nanotube nanohybrids was investigated. Single-walled carbon nanotubes (SWCNTs) were surface-modified with long-chain phosphonic acids, thus imparting heat-resistant/non-desorption properties. Polyvinylidene fluoride (PVDF) was used as the crystalline Fluorinated Polymer and a polypropylene (PP) matrix as the crystalline hydrogenated Polymer, for comparison. In the nanocomposite preparation, PVDF was combined with phosphonic acid-modified SWCNT containing fluorocarbon chains, and PP was combined with phosphonic acid-modified SWCNT containing hydrocarbon chains. Nanocomposite preparations of organo-SWCNTs with an affinity for the Polymer matrix were achieved by a simple melt-compound method. These nanocomposites were uniaxially drawn at high temperatures near its melting point, and the organo-SWCNTs were aligned in the Polymer matrix along the drawn direction. The lamellae in the Fluorinated Polymer-based nanohybrids were aligned parallel to the drawn direction at 5 × drawing, and converted to a herringbone arrangement with a left–right tilting at 7 × to 9 × drawings. As a result, it was clarified that the addition of a small amount of SWCNT leads to an improvement of crystallinity, crystallization temperature, lamella thickness, and mechanical properties of the nanocomposites. Graphic abstract
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effect of the uniaxial orientation on the Polymer filler nanocomposites using phosphonate modified single walled carbon nanotube with hydro or fluorocarbons
Polymer Bulletin, 2020Co-Authors: Takuto Hayasaki, Yoshinori Abiko, Ahmed A. Almarasy, Shuichi Akasaka, Atsuhiro FujimoriAbstract:The effect of drawn orientation on crystalline Fluorinated Polymer/carbon nanotube nanohybrids was investigated. Single-walled carbon nanotubes (SWCNTs) were surface-modified with long-chain phosphonic acids, thus imparting heat-resistant/non-desorption properties. Polyvinylidene fluoride (PVDF) was used as the crystalline Fluorinated Polymer and a polypropylene (PP) matrix as the crystalline hydrogenated Polymer, for comparison. In the nanocomposite preparation, PVDF was combined with phosphonic acid-modified SWCNT containing fluorocarbon chains, and PP was combined with phosphonic acid-modified SWCNT containing hydrocarbon chains. Nanocomposite preparations of organo-SWCNTs with an affinity for the Polymer matrix were achieved by a simple melt-compound method. These nanocomposites were uniaxially drawn at high temperatures near its melting point, and the organo-SWCNTs were aligned in the Polymer matrix along the drawn direction. The lamellae in the Fluorinated Polymer-based nanohybrids were aligned parallel to the drawn direction at 5 × drawing, and converted to a herringbone arrangement with a left–right tilting at 7 × to 9 × drawings. As a result, it was clarified that the addition of a small amount of SWCNT leads to an improvement of crystallinity, crystallization temperature, lamella thickness, and mechanical properties of the nanocomposites.