巻号一覧
前身誌
52 巻, 6 号
第50回技術討論会特集
選択された号の論文の6件中1～6を表示しています
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論文
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橋本 達也, 綿野 哲2015 年 52 巻 6 号 p. 314-318
発行日: 2015/06/10
公開日: 2015/06/17
ジャーナル フリーIn order to satisfy the social demand for miniaturization of electric device, coin type manganese dioxide Lithium primary batteries with small size and low cost are required. In the general manufacturing process, manganese dioxide as an active material is mixed with a conductive carbon black, followed by a wet granulation with a binder such as fluorocarbon polymer. As a common problem, increase in the amount of binder causes degradation of the battery performance, because it prevents conductive passes. On the other hand, reduction in binder decreases adhesive property of each material, leading to generate cracks or chips. So far, adhesive carbon black has been reported as a conductive material. This achieves reduction in the amount of binder, however, it may also cause degradation in battery capacity.
In this study, expanded graphite, which shows better compatibility than the carbon black, was used as a conductive material. Effect of the size on the compatibility and the battery performance were evaluated experimentally. A coin type battery was prepared and a constant-resistance discharge and pulse tests were conducted. Based on the results, optimum formulation was determined for the positive electrode.抄録全体を表示PDF形式でダウンロード (996K) -
近藤 光, 中村 衣利, 小澤 隆弘, 内藤 牧男2015 年 52 巻 6 号 p. 319-324
発行日: 2015/06/10
公開日: 2015/06/17
ジャーナル フリーThe composite granules prepared by one-step mechanical processing from the starting raw powders of La0.8Sr0.2MnO3 （LSM） and Scandia stabilized zirconia （ScSZ） fine particles were used to prepare LSM/ScSZ composite cathode of SOFC. In this paper, the microstructures of the composite granules of LSM/ScSZ and those of the resultant cathodes sintered at 1100, 1150 and 1200℃ were observed. In the composite granule and the resultant cathode, homogeneous dispersion of LSM and ScSZ was achieved, and the connected network of LSM and that of ScSZ were well organized. As results of electrochemical examinations by impedance measurements, polarization resistance of cathode sintered at 1150℃ was the lowest in three cathodes. On the other hand, particle sintering was not still well done at 1100℃. At 1200℃, grains were grown up in the cathode. It was concluded that the cathode sintered at 1150℃ had the largest triple phase boundaries among LSM, ScSZ and gas phase.抄録全体を表示PDF形式でダウンロード (1028K) -
堀田 禎, 田中 正明, 福井 武久, 白井 孝, 藤 正督2015 年 52 巻 6 号 p. 325-329
発行日: 2015/06/10
公開日: 2015/06/17
ジャーナル フリーCarbon / alumina granules were prepared from alumina-based slurries with varied carbon powder loadings by spray-dryer. Electromagnetic wave absorption performances were evaluated in a frequency range from 2.6 to 15 GHz after the granules were filled into acrylic container. As a result, the electromagnetic wave absorption performances were observed to these granules. Especially, the carbon / alumina granules with carbon loadings from 2 to 5 mass％ were confirmed to have high absorptions more than 20 dB, which was required performance for electromagnetic wave absorber. In addition, it was understood that the frequency at the maximum adsorption could be controlled by the loading amount of carbon powder and the thickness of packing layer.抄録全体を表示PDF形式でダウンロード (1352K) -
坂本 陽平, 仲村 英也, 綿野 哲2015 年 52 巻 6 号 p. 330-336
発行日: 2015/06/10
公開日: 2015/06/17
ジャーナル フリーGranulation of drug particles for dry powder inhalation was conducted by means of a novel granulation method, named as Advanced Freeze Granulation by Supercritical Fluid. In this method, drug particles were micronized and granulated by the following steps: 1） drug particles were micronized by beads milling in a supercritical carbon dioxide （SC-CO2）; 2） additional micronization were took place by shear force when particles together with SC-CO2 were sprayed into atmosphere through a nozzle; 3） the micronized particles were instantaneously granulated with dry ices generated by a rapid temperature decrease when spraying the SC-CO2; and 4） the dry ices in granules were immediately sublimated by a hot air, resulting in porous spherical granules with high flowability and dispersibility.
In this study, sodium cromoglicate was used as a model drug and granules were prepared by a novel Advanced Freeze Granulation by Supercritical Fluid under various operating parameters. Physical properties of granules and their inhalation performance were evaluated. It was found that temperature and pressure of the SC-CO2 were the most important parameters which determine size of the micronized particles and the inhalation performance. The granule generation mechanism by this method was also discussed.抄録全体を表示PDF形式でダウンロード (929K) -
浅井 直親, 綿野 哲2015 年 52 巻 6 号 p. 337-344
発行日: 2015/06/10
公開日: 2015/06/17
ジャーナル フリーIn the present study, numerical analysis of particle behavior in horizontal high shear mixer with super high speed chopper （SPM mixer） was conducted. The three-dimensional particle motion in SPM mixer was calculated using discrete elements method （DEM）. Torque of chopper blades, particle velocity, and forces acting on particles were calculated under various chopper rotational speeds. The particle flow changed with the chopper rotational speed. The torque of chopper blades and the forces acting on particles increased with an increase in rotational speed of the chopper. It became clear that the more rotational speed of chopper, the more torque of chopper and forces acting on particles increased at an accelerated rate.
The result of simulation was confirmed by experiment of dry dispersion of fine particle using SPM mixer. Ferric oxide was used as fine particle. It was found that dispersion time decreased at an accelerated rate with an increase in rotational speed of chopper.抄録全体を表示PDF形式でダウンロード (3764K)
解説
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杉森 健一2015 年 52 巻 6 号 p. 345-352
発行日: 2015/06/10
公開日: 2015/06/17
ジャーナル 認証ありTablets are the most commonly used pharmaceutical dosage form and they are manufactured by compacting powders containing pharmaceutical active compound with a tableting machine. Compaction process of pharmaceutical powders consists of filling process of powders into a die, compressing process of filled powders in a die by upper and lower punches and ejection process of a compacted tablet from a die. The technical subjects on each process, such as mass and content uniformity, capping and sticking, are reviewed.抄録全体を表示PDF形式でダウンロード (900K)
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