巻号一覧
27 巻 (2002)
- 6 号 p. 296-
- 5 号 p. 216-
- 4 号 p. 164-
- 3 号 p. 108-
- 2 号 p. 58-
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27 巻, 3 号
選択された号の論文の8件中1～8を表示しています
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岡田 達弘2002 年 27 巻 3 号 p. 108-117
発行日: 2002/05/01
公開日: 2011/03/04
ジャーナル フリーWater and ion transport characteristics are discussed with relevance to the microscopic structural properties of perfluorinated ionomer membranes that are used as H+ conducting membranes in polymer electrolyte fuel cells. Some morphological models of ion pair aggregation and cluster formation are briefly introduced, together with reported experimental results like diffraction or spectroscopic studies. Transport models in the ionomer membranes are also discussed that can fit the experimental data. A new concept of ion transport in the polymer membrane in relation to the interaction of ion and water molecules inside the ionic channel is proposed, which is to become of particular use in designing high performance ion conducting polymer membranes.抄録全体を表示PDF形式でダウンロード (1188K) -
本間 格2002 年 27 巻 3 号 p. 118-123
発行日: 2002/05/01
公開日: 2011/03/04
ジャーナル フリーProtonic conductor has been studied for a large number of inorganic and polymer materials because of the technological potential for fuel cells, hydrogen separation and other electrochemical devices (1-3). In this paper, new class of organic/inorganic hybrid membranes have been synthesized through sol-gel processes. The membrane doped with acidic moieties such as tungstic isopolyacids, acidic tungsten oxide clusters and 12-phosphotungstic acid (PWA) shows good protonic conductivities at high temperatures up to 160°C and was found to be a flexible as well as thermally stable due to the temperature tolerant inorganic frameworks in the hybrids. The effect of molecular structure of polymer phase as well as inorganic structures on to the protonic conductivity have been studied.抄録全体を表示PDF形式でダウンロード (817K) -
山口 猛央2002 年 27 巻 3 号 p. 124-130
発行日: 2002/05/01
公開日: 2011/03/04
ジャーナル フリーTo develop a high performance direct methanol fuel cell (DMFC), a novel electrolyte membrane is needed. This electrolyte membrane should be durable up to 130t to improve the catalytic reaction, and the methanol crossover should be reduced. Reported membranes are reviewed in this article, and our own approach is shown. Our approach is to design a pore-filling type polyelectrolyte membrane, where the polyelectrolyte is filled into the pores of a porous substrate, and the membrane swelling is suppressed by the substrate matrix. Proton conductivity was achieved through the filling electrolyte polymer. Methanol permeation was controlled by the swelling of the electrolyte polymer, and the mechanical strength at high temperature was maintained by the substrate. From this concept, a high proton conductivity was shown to exist with reduced membrane methanol permeability, and in addition, a heat-resistance was also achieved.抄録全体を表示PDF形式でダウンロード (1194K) -
宮武 健治, 渡辺 政廣2002 年 27 巻 3 号 p. 131-138
発行日: 2002/05/01
公開日: 2011/03/04
ジャーナル フリーThis article reviews recent progress in the proton conducting polymer electrolyte membranes for fuel cell applications. Functionalization of aromatic hydrocarbon polymers such as poly ether ether ketone (PEEK), polysulfone (PSF), polyphenylene sulfide (PPS), polyimide (PI), polybenzimidazole (PBI), polyphosphazene, and fluorinated polystyrene is described. The approaches include direct sulfonation, polymerization of functionalized monomers, sulfo-and phosphoalkylation, and acid/base complexation. High proton conductivity, (up to 0.3 Scm-1 at RH 100% and 20°C) has been obtained for these polymer electrolyte membranes. Since hydrophobic/hydrophilic separation for hydrocarbon polymer electrolytes is less pronounced than that of perfluorinated ionomer, acid functional groups should be placed closely each other and apart from the hydrophobic segments for high proton conductivity as well as oxidative and hydrolytic stability. Proton conduction under nonaqueous conditions (without humidification) is also proposed for sulfonated PPS/oligo (ethylene oxide) composite and polyhydroxylated fullerene.抄録全体を表示PDF形式でダウンロード (960K) -
寺田 一郎, 中尾 眞2002 年 27 巻 3 号 p. 139-144
発行日: 2002/05/01
公開日: 2011/03/04
ジャーナル フリーMembrane characteristics and cell performance of the fibril-reinforced membrane developed in Asahi Glass company were reviewed. Mechanical properties of the fibril-reinforced membranes such as modulus, tear strength and compression property were investigated, and compared with non-reinforced membranes. The fibril-reinforced membranes have shown conspicuous improvement while their electric resistance and cell performance were almost same as those of non-reinforced ones. Good durability of the fibril-reinforced membrane has been confirmed in the cell operation at 80°C for 5000hrs and an elevated temperature operation at 90°C were also examined.抄録全体を表示PDF形式でダウンロード (692K) -
五十嵐 治, 宇都 正幸, 井上 貞信, 星 座, 菅原 俊継, 木村 主幸, 三澤 顕次, 有沢 準二2002 年 27 巻 3 号 p. 145-150
発行日: 2002/05/01
公開日: 2011/03/04
ジャーナル フリーThe electrochemical behavior of metal coated hollow fiber membrane electrodes is studied and their application to the amperometric detection of sugars in high-performance liquid chromatography (HPLC) is described. In the cyclic voltammetry in 0.15M NaOH of the nickel coated hollow fiber membrane electrode, broad reduction wave from Ni (III) to Ni (II) was observed, and the peak current decreased with the dependence on the concentration of glucose. This is because the elctrocatalytic oxidation of glucose by the metal oxide has been generated. The electrochemical detector for HPLC was produced in the nickel coated hollow fiber membrane electrode, and it was controlled in the potential of which the oxidation current of glucose was observed. It was found that the 8 mm electrode length was optimum for the detection of glucose in the flow system. In addition, electroconductive hollow fiber membrane electrode which covered with copper, gold, platinum was developed. The peak current of glucose and value of the noise in each electrode were measured. The detection limits (S/N=3) for glucoses were 9.8 pmol in case of Ni coated, 2.1 pmol on Cu, 3.5 pmol on Pt and 19.9 pmol on Au, respectively.抄録全体を表示PDF形式でダウンロード (1017K) -
Shigeki Sawada, Kazuo Suzuki, Kunihiro Iwasaki, Kanji Matsumoto2002 年 27 巻 3 号 p. 151-158
発行日: 2002/05/01
公開日: 2011/03/04
ジャーナル フリーThe use of membrane bioreactors (MBRs) is rapidly increasing in the field of organic wastewater treatment. In typical MBR applications for activated sludge processes, the aeration for oxygen supply is also used to maintain high cross-flow liquid velocity over the submerged membrane system (SMS). The prime objective of this study was to demonstrate the effect of presence of gas phase fraction in suspension on the performance of membrane filtration. Experimental studies were performed using two different membrane modules of (1) flat sheet membrane cell (FMC) operated outside the feed tank, where the cross flow velocity of liquid and the volume fraction of gas were changed independently, and (2) flat sheet SMS operated in tank. The relationship between the cross flow velocity, volume fraction of gas phase and the trans-membrane pressure (TMP) were determined. It was observed that the rate of increase in TMP did not depend on the presence of gas phase, but depended on the real cross-flow liquid velocity, uL', for both the FMC with and without gas phase and the flat-sheet SMS.抄録全体を表示PDF形式でダウンロード (919K) -
竹本 信一郎2002 年 27 巻 3 号 p. 159-160
発行日: 2002/05/01
公開日: 2011/03/04
ジャーナル フリーIn the gas permeation test for the polymer membrane etc., with the exception of power on and off, sample loading and pressure reducing valve setting of gas cylinder, this system is automatic mechanism for operating and measuring of gas transmission rate, permeability coefficient and diffusion coefficient.
Moreover, in case of this apparatus connected to Gas Chromatograph, you can analize a mixed gas, and these automatic operation is possible too.抄録全体を表示PDF形式でダウンロード (187K)
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