To realize the actual TINA-based telecommunications network, the performance of the kernel Transp... more To realize the actual TINA-based telecommunications network, the performance of the kernel Transport Network (kTN) such as availability, reliability, throughput and load tolerance becomes more crucial than for existing computer networks. The authors have been studying and developing a super-integrated data-driven processor to be applied to the TINA kTN nodes and network interfaces in CUE (Coordinating Users' requirements and Engineering
High quality nickel films having fine grains have been developed using a new electroplating metho... more High quality nickel films having fine grains have been developed using a new electroplating method involving the emulsion of a supercritical carbon dioxide, an electroplating solution and a surfactant. The plated films using this method have a uniformity of the surface and Vickers hardness, which is better than the results obtained by using conventional electroplating methods. ᮊ
This paper discusses the dispersion behaviors in an agitated ternary system of CO 2 and a nickel ... more This paper discusses the dispersion behaviors in an agitated ternary system of CO 2 and a nickel electroplating solution with a novel anionic surfactant F(CF(CF 3 )CF 2 O) 4 CF(CF 3 )COO À NH 4 + , as functions of pressure and CO 2 phase volume fraction. The CO 2 volume fraction in the emulsion system strongly influences the type of emulsion. The inversion from CO 2 -in-water (C/W) to water-in-CO 2 (W/C) emulsion depends on pressure, which in turn depends on the density. On the basis of the observed dispersion behaviors, the application of the C/W and W/C emulsions in electroplating has been examined. The formation of a C/W emulsion with a continuous aqueous phase proved to be essential for the electroplating reaction. The W/C emulsions, on the other hand, were only poorly conducive to the electroplating reaction. D
We investigated an electroplating reaction in a series of emulsions between an electroplating sol... more We investigated an electroplating reaction in a series of emulsions between an electroplating solution and dense carbon dioxide (CO 2 ) using a novel fluorinated surfactant F(CF(CF 3 )CF 2 O) 3 CF(CF 3 )COO(CH 2 CH 2 O) 7 CH 3 . The electroplating reaction took place in the emulsions as a function of the CO 2 volume fraction, and electroplating was found to be possible in an emulsion composed of even 80 vol.% CO 2 and 20 vol.% electroplating solution. Films composed of a nanograin structure with a grain size of about 10 nm were obtained. We elucidated the plating reaction by measuring the current values in the emulsion using minute terminals connected to a programmable power supply, while simultaneously observing the dispersion state of the emulsion through a high-pressure view cell. The flow of current values in the emulsion system fluctuated, and the current value decreased together with the amplitude of the fluctuant current when the pressure was increased. The fluctuant current flow in the emulsion was concluded to play an important role in the fabrication of the nanograin nickel structure in the plated film. D
We conducted an electroplating reaction in a constantly agitated ternary system of dense carbon d... more We conducted an electroplating reaction in a constantly agitated ternary system of dense carbon dioxide (CO 2 ) and electroplating solution with a novel fluorinated surfactant, F(CF(CF 3 )CF 2 O) 3 CF(CF 3 )COO(CH 2 CH 2 O)CH 3 . The reaction in the emulsion was investigated as a function of the CO 2 volume fraction and surfactant concentration. With a low surfactant concentration, the nickel film plated in an emulsion composed of less than 20% CO 2 by volume was flat with many pinholes. Electroplating with a 0.09% surfactant concentration in the plating solution by volume formed a smooth film surface free of pinholes. The novel porous film of nickel was fabricated with a 0.12% concentration in the emulsion by volume. Electroplating was found to be possible in an emulsion composed of 40% CO 2 and 60% electroplating solution by volume. Smooth plated films free of pinholes were obtained from the emulsion system in the composition range of 20-40% CO 2 by volume with the novel fluorinated surfactant. With an increase of the surfactant concentration, nickel films with a multi-porous structure were obtained in an emulsion composed of less than 20% CO 2 by volume. This metallic film had a complicated porous structure made up of spheroidal pores of various diameters. We suggested that this novel porous structure could have originated from the emulsion of the electroplating solution and dense CO 2 with the novel fluorinated surfactant. The structure could have been fabricated via the formation of "hard" micelles in the reaction system with a specific surfactant concentration and CO 2 composition. CO 2 in a water micro-emulsion was formed in this reaction system and the dispersion states influenced the novel multiporous structure of the plated film.
Summary form only given. In order to obtain efficient second harmonic (SH) light in a waveguide, ... more Summary form only given. In order to obtain efficient second harmonic (SH) light in a waveguide, the uniformity of the waveguide has to be controlled within 50 Å. A new phase matching technique, the so called electrical poling phase matching is proposed to release the severe condition
An electroplating reaction using nickel was carried out in an emulsion of dense carbon dioxide (C... more An electroplating reaction using nickel was carried out in an emulsion of dense carbon dioxide (CO2) and an electroplating solution with nonionic surfactants. The current efficiency and electrical resistance values were measured as a function of CO2 volume fraction in the emulsion with three kinds of surfactants. These results show that dense CO2 beyond the critical point of CO2 is
A nanocrystalline nickel film was prepared by an electroplating method in a constantly agitated t... more A nanocrystalline nickel film was prepared by an electroplating method in a constantly agitated ternary system of dense carbon dioxide (CO 2 ) and electroplating solution using a surfactant. The averaged grain size of the plated Ni film was 11.1 nm. In contrast, a nickel film prepared from an electroplating solution by a conventional method without the use of surfactant had an average grain size of about 19.8 nm. The Vickers hardness of the film obtained by the new method was about 680 Hv, while that prepared from the electroplating solution alone was only about 550 Hv. As a consequence, it can be deduced that grain-size strengthening was observed in the electroplated film obtained using this emulsion system. D
Organic electroluminescent (EL) devices using molecularly dispersed poly(N-vinylcarbazole) (PVCz)... more Organic electroluminescent (EL) devices using molecularly dispersed poly(N-vinylcarbazole) (PVCz) exhibit an irreversible transition phenomenon with a simultaneous and remarkable improvement in carrier injection at high bias voltage by doping with ammonium salt. The device structure used in this study was an indium tin oxide anode/PVCz:2,5-bis(1-naphtyl)-l,3,4-ox adiazole:coumarin 6:tetra-n-butylammonium tetrafluoroborate/metal cathode. The altered devices require significantly lower driving voltage and exhibit higher
... SUSANA HERNANDEZ', TAKESHI OGAWA, TOSHIYUKI WATANABEb and SEIZO MIYATAb kl lnstitut... more ... SUSANA HERNANDEZ', TAKESHI OGAWA, TOSHIYUKI WATANABEb and SEIZO MIYATAb kl lnstituto de lnvestigaciones en Materiales, Universidad Nacional ... Dalton and his coworker [9] have reported previously a few polymers containing a diacetylene group and a ...
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, 1993
... LIGHT EMITTING LANGMUIR-BLODGE'TT FILMS KIYOMI SUGAI, SEIZO MIYATA AND TOSWUKI WATANABE ... more ... LIGHT EMITTING LANGMUIR-BLODGE'TT FILMS KIYOMI SUGAI, SEIZO MIYATA AND TOSWUKI WATANABE Tokyo University of Agriculture and Technology, Koganei, Tokyo 184, Japan YOSHIYUKI OKAMOTO Polytechnic University, Brooklyn, New York 1 1201, USA ...
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, 2000
ABSTRACT The molecular orientations of homo Y-type LB films of main-chain accordion polymer havin... more ABSTRACT The molecular orientations of homo Y-type LB films of main-chain accordion polymer having different alkyl chain (R = 12 and 16) are investigated. The homo Y-type LB films were prepared by using Miyata-type deposition system. The nonlinear optical coefficients of d33 for R = 12 and R = 16, from the result of reflected SHG intensity, are 12.0 and 8.6 pm/V. respectively. The bilayer spacing of homo Y-type LB films value from the result of wide angle X-ray diffraction (WAXD) spectra is shorter than the fully extended length of each molecule by CPK model. From the Maker-fringe for Y-type LB films, the SHG strength became the strongest when the P-P polarization was greatly slanted in the substrate. These results reveal that spontaneous polarization remains along the thickness direction. We proposed the structure of a new homo Y-type LB film which is different arrangement between odd-numbered layer and even-numbered layer.
Page 1. Macromol. Symp. 192,123-133 (2003) 123 Novel Diacetylene-Containing Polymers for Second O... more Page 1. Macromol. Symp. 192,123-133 (2003) 123 Novel Diacetylene-Containing Polymers for Second Order NLO Applications: Effect of Main Chains and Structure Property Relationships Susana Hernández", Hirohiko Miura ...
The electronic structure of nitrogen introduced into various carbon-based cathode catalysts for t... more The electronic structure of nitrogen introduced into various carbon-based cathode catalysts for the polymer electrolyte fuel cell (PEFC) is investigated using X-ray absorption spectroscopy (XAS). The profile of * peaks at the pre-edge of N 1s XAS spectra is used to determine the chemical state of nitrogen, which can be an indicator of oxygen reduction reaction (ORR) activity. It is found that catalysts with a relatively larger amount of graphite-like nitrogen exhibit a higher ORR activity than those with a relatively larger amount of pyridine-like nitrogen. We propose that effective doping with graphite-like nitrogen is a practical guideline for the synthesis of active carbon alloy catalysts.
We report the optical and electroluminescent properties of the lithium complex of (2,3-dimethyl-8... more We report the optical and electroluminescent properties of the lithium complex of (2,3-dimethyl-8-hydroxyquinoline) lithium (LiMMq), exhibiting intense photoluminescence (PL), peaked at about 458 nm. As the result of electron-donating methyl groups in 8-hydroxyquinoline, the PL spectrum is blue-shifted relative to (8-hydroxyquinoline) lithium (Liq). The double-layer electroluminescent devices with a novel polymer poly(N,N'-diphenyl-N,N'-bis(4-methylphenyl)-1,4-phenylenediamine-1,3- diisopropenylbenzene) as hole transporting layer and the LiMMq
ABSTRACT The novel derivates of tris(8-hydroxyquinoline)aluminium (Alq3), tris[5-(methyl-malononi... more ABSTRACT The novel derivates of tris(8-hydroxyquinoline)aluminium (Alq3), tris[5-(methyl-malononitrile)-8-hydroxyquinoline]aluminium and tris(2,3-dimethyl-8-hydroxyquinoline)aluminium were synthesized. The double-layer electroluminescent devices were fabricated with a novel polymer poly(N,N'-diphenyl-N,N'-bis(4-methylphenyl)-1,4- phenylenediamine-1,3-diisopropenylbenzene) as a hole transporting layer and the derivates as an emitting layer, sandwiched between an anode of Mg:Ag and a cathode of indium-tin oxide. Bright blue and yellow electroluminescence emissions were obtained from the devices. The experimental results indicate that a functional group of electron acceptors connected to 8-hydroxyquinoline results in the emission redshift and a functional group of electron donors results in the emission blueshift. Alq3 and its derivates are expected to be used as an emitter to achieve various colour emissions.
To realize the actual TINA-based telecommunications network, the performance of the kernel Transp... more To realize the actual TINA-based telecommunications network, the performance of the kernel Transport Network (kTN) such as availability, reliability, throughput and load tolerance becomes more crucial than for existing computer networks. The authors have been studying and developing a super-integrated data-driven processor to be applied to the TINA kTN nodes and network interfaces in CUE (Coordinating Users' requirements and Engineering
High quality nickel films having fine grains have been developed using a new electroplating metho... more High quality nickel films having fine grains have been developed using a new electroplating method involving the emulsion of a supercritical carbon dioxide, an electroplating solution and a surfactant. The plated films using this method have a uniformity of the surface and Vickers hardness, which is better than the results obtained by using conventional electroplating methods. ᮊ
This paper discusses the dispersion behaviors in an agitated ternary system of CO 2 and a nickel ... more This paper discusses the dispersion behaviors in an agitated ternary system of CO 2 and a nickel electroplating solution with a novel anionic surfactant F(CF(CF 3 )CF 2 O) 4 CF(CF 3 )COO À NH 4 + , as functions of pressure and CO 2 phase volume fraction. The CO 2 volume fraction in the emulsion system strongly influences the type of emulsion. The inversion from CO 2 -in-water (C/W) to water-in-CO 2 (W/C) emulsion depends on pressure, which in turn depends on the density. On the basis of the observed dispersion behaviors, the application of the C/W and W/C emulsions in electroplating has been examined. The formation of a C/W emulsion with a continuous aqueous phase proved to be essential for the electroplating reaction. The W/C emulsions, on the other hand, were only poorly conducive to the electroplating reaction. D
We investigated an electroplating reaction in a series of emulsions between an electroplating sol... more We investigated an electroplating reaction in a series of emulsions between an electroplating solution and dense carbon dioxide (CO 2 ) using a novel fluorinated surfactant F(CF(CF 3 )CF 2 O) 3 CF(CF 3 )COO(CH 2 CH 2 O) 7 CH 3 . The electroplating reaction took place in the emulsions as a function of the CO 2 volume fraction, and electroplating was found to be possible in an emulsion composed of even 80 vol.% CO 2 and 20 vol.% electroplating solution. Films composed of a nanograin structure with a grain size of about 10 nm were obtained. We elucidated the plating reaction by measuring the current values in the emulsion using minute terminals connected to a programmable power supply, while simultaneously observing the dispersion state of the emulsion through a high-pressure view cell. The flow of current values in the emulsion system fluctuated, and the current value decreased together with the amplitude of the fluctuant current when the pressure was increased. The fluctuant current flow in the emulsion was concluded to play an important role in the fabrication of the nanograin nickel structure in the plated film. D
We conducted an electroplating reaction in a constantly agitated ternary system of dense carbon d... more We conducted an electroplating reaction in a constantly agitated ternary system of dense carbon dioxide (CO 2 ) and electroplating solution with a novel fluorinated surfactant, F(CF(CF 3 )CF 2 O) 3 CF(CF 3 )COO(CH 2 CH 2 O)CH 3 . The reaction in the emulsion was investigated as a function of the CO 2 volume fraction and surfactant concentration. With a low surfactant concentration, the nickel film plated in an emulsion composed of less than 20% CO 2 by volume was flat with many pinholes. Electroplating with a 0.09% surfactant concentration in the plating solution by volume formed a smooth film surface free of pinholes. The novel porous film of nickel was fabricated with a 0.12% concentration in the emulsion by volume. Electroplating was found to be possible in an emulsion composed of 40% CO 2 and 60% electroplating solution by volume. Smooth plated films free of pinholes were obtained from the emulsion system in the composition range of 20-40% CO 2 by volume with the novel fluorinated surfactant. With an increase of the surfactant concentration, nickel films with a multi-porous structure were obtained in an emulsion composed of less than 20% CO 2 by volume. This metallic film had a complicated porous structure made up of spheroidal pores of various diameters. We suggested that this novel porous structure could have originated from the emulsion of the electroplating solution and dense CO 2 with the novel fluorinated surfactant. The structure could have been fabricated via the formation of "hard" micelles in the reaction system with a specific surfactant concentration and CO 2 composition. CO 2 in a water micro-emulsion was formed in this reaction system and the dispersion states influenced the novel multiporous structure of the plated film.
Summary form only given. In order to obtain efficient second harmonic (SH) light in a waveguide, ... more Summary form only given. In order to obtain efficient second harmonic (SH) light in a waveguide, the uniformity of the waveguide has to be controlled within 50 Å. A new phase matching technique, the so called electrical poling phase matching is proposed to release the severe condition
An electroplating reaction using nickel was carried out in an emulsion of dense carbon dioxide (C... more An electroplating reaction using nickel was carried out in an emulsion of dense carbon dioxide (CO2) and an electroplating solution with nonionic surfactants. The current efficiency and electrical resistance values were measured as a function of CO2 volume fraction in the emulsion with three kinds of surfactants. These results show that dense CO2 beyond the critical point of CO2 is
A nanocrystalline nickel film was prepared by an electroplating method in a constantly agitated t... more A nanocrystalline nickel film was prepared by an electroplating method in a constantly agitated ternary system of dense carbon dioxide (CO 2 ) and electroplating solution using a surfactant. The averaged grain size of the plated Ni film was 11.1 nm. In contrast, a nickel film prepared from an electroplating solution by a conventional method without the use of surfactant had an average grain size of about 19.8 nm. The Vickers hardness of the film obtained by the new method was about 680 Hv, while that prepared from the electroplating solution alone was only about 550 Hv. As a consequence, it can be deduced that grain-size strengthening was observed in the electroplated film obtained using this emulsion system. D
Organic electroluminescent (EL) devices using molecularly dispersed poly(N-vinylcarbazole) (PVCz)... more Organic electroluminescent (EL) devices using molecularly dispersed poly(N-vinylcarbazole) (PVCz) exhibit an irreversible transition phenomenon with a simultaneous and remarkable improvement in carrier injection at high bias voltage by doping with ammonium salt. The device structure used in this study was an indium tin oxide anode/PVCz:2,5-bis(1-naphtyl)-l,3,4-ox adiazole:coumarin 6:tetra-n-butylammonium tetrafluoroborate/metal cathode. The altered devices require significantly lower driving voltage and exhibit higher
... SUSANA HERNANDEZ', TAKESHI OGAWA, TOSHIYUKI WATANABEb and SEIZO MIYATAb kl lnstitut... more ... SUSANA HERNANDEZ', TAKESHI OGAWA, TOSHIYUKI WATANABEb and SEIZO MIYATAb kl lnstituto de lnvestigaciones en Materiales, Universidad Nacional ... Dalton and his coworker [9] have reported previously a few polymers containing a diacetylene group and a ...
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, 1993
... LIGHT EMITTING LANGMUIR-BLODGE'TT FILMS KIYOMI SUGAI, SEIZO MIYATA AND TOSWUKI WATANABE ... more ... LIGHT EMITTING LANGMUIR-BLODGE'TT FILMS KIYOMI SUGAI, SEIZO MIYATA AND TOSWUKI WATANABE Tokyo University of Agriculture and Technology, Koganei, Tokyo 184, Japan YOSHIYUKI OKAMOTO Polytechnic University, Brooklyn, New York 1 1201, USA ...
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, 2000
ABSTRACT The molecular orientations of homo Y-type LB films of main-chain accordion polymer havin... more ABSTRACT The molecular orientations of homo Y-type LB films of main-chain accordion polymer having different alkyl chain (R = 12 and 16) are investigated. The homo Y-type LB films were prepared by using Miyata-type deposition system. The nonlinear optical coefficients of d33 for R = 12 and R = 16, from the result of reflected SHG intensity, are 12.0 and 8.6 pm/V. respectively. The bilayer spacing of homo Y-type LB films value from the result of wide angle X-ray diffraction (WAXD) spectra is shorter than the fully extended length of each molecule by CPK model. From the Maker-fringe for Y-type LB films, the SHG strength became the strongest when the P-P polarization was greatly slanted in the substrate. These results reveal that spontaneous polarization remains along the thickness direction. We proposed the structure of a new homo Y-type LB film which is different arrangement between odd-numbered layer and even-numbered layer.
Page 1. Macromol. Symp. 192,123-133 (2003) 123 Novel Diacetylene-Containing Polymers for Second O... more Page 1. Macromol. Symp. 192,123-133 (2003) 123 Novel Diacetylene-Containing Polymers for Second Order NLO Applications: Effect of Main Chains and Structure Property Relationships Susana Hernández", Hirohiko Miura ...
The electronic structure of nitrogen introduced into various carbon-based cathode catalysts for t... more The electronic structure of nitrogen introduced into various carbon-based cathode catalysts for the polymer electrolyte fuel cell (PEFC) is investigated using X-ray absorption spectroscopy (XAS). The profile of * peaks at the pre-edge of N 1s XAS spectra is used to determine the chemical state of nitrogen, which can be an indicator of oxygen reduction reaction (ORR) activity. It is found that catalysts with a relatively larger amount of graphite-like nitrogen exhibit a higher ORR activity than those with a relatively larger amount of pyridine-like nitrogen. We propose that effective doping with graphite-like nitrogen is a practical guideline for the synthesis of active carbon alloy catalysts.
We report the optical and electroluminescent properties of the lithium complex of (2,3-dimethyl-8... more We report the optical and electroluminescent properties of the lithium complex of (2,3-dimethyl-8-hydroxyquinoline) lithium (LiMMq), exhibiting intense photoluminescence (PL), peaked at about 458 nm. As the result of electron-donating methyl groups in 8-hydroxyquinoline, the PL spectrum is blue-shifted relative to (8-hydroxyquinoline) lithium (Liq). The double-layer electroluminescent devices with a novel polymer poly(N,N'-diphenyl-N,N'-bis(4-methylphenyl)-1,4-phenylenediamine-1,3- diisopropenylbenzene) as hole transporting layer and the LiMMq
ABSTRACT The novel derivates of tris(8-hydroxyquinoline)aluminium (Alq3), tris[5-(methyl-malononi... more ABSTRACT The novel derivates of tris(8-hydroxyquinoline)aluminium (Alq3), tris[5-(methyl-malononitrile)-8-hydroxyquinoline]aluminium and tris(2,3-dimethyl-8-hydroxyquinoline)aluminium were synthesized. The double-layer electroluminescent devices were fabricated with a novel polymer poly(N,N'-diphenyl-N,N'-bis(4-methylphenyl)-1,4- phenylenediamine-1,3-diisopropenylbenzene) as a hole transporting layer and the derivates as an emitting layer, sandwiched between an anode of Mg:Ag and a cathode of indium-tin oxide. Bright blue and yellow electroluminescence emissions were obtained from the devices. The experimental results indicate that a functional group of electron acceptors connected to 8-hydroxyquinoline results in the emission redshift and a functional group of electron donors results in the emission blueshift. Alq3 and its derivates are expected to be used as an emitter to achieve various colour emissions.
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Papers by Seizo Miyata