Journal of the Society of Inorganic Materials, Japan
Online ISSN : 2185-4378
ISSN-L : 1345-3769
9 巻 , 301 号
選択された号の論文の9件中1~9を表示しています
  • 佐々木 高義
    2002 年 9 巻 301 号 p. 477-484
    発行日: 2002/11/01
    公開日: 2011/03/07
    ジャーナル フリー
  • 藤 正督, 志村 直明, 武井 孝, 近沢 正敏, 田辺 克幸, 三觜 幸平
    2002 年 9 巻 301 号 p. 485-491
    発行日: 2002/11/01
    公開日: 2011/03/07
    ジャーナル フリー
    The technique to make calcium carbonate a photocatalyst by the surface treatment which used the fatty acid zinc and the surface oxidation was studied. The relationship between the kind of the fatty acid zinc and the state of the zinc introduced on the surface was investigated. In addition, the relation between the state of zinc and the photocatalytic ability was discussed. The surface of calcium carbonate was able to make a photocatalyst by using the process of the adsorption of the fatty acid zinc and the surface oxidation. It has been understood that the structure of the zinc oxide generated with the change of an organic chain length of the fatty acid zinc is different. The grainy zinc oxide in the sample which used zinc stearate was generated, and layered zinc oxide in the sample which used zinc acetate was generated, respectively.The layered zinc oxide was excellent in the photocatalytic ability compared with the grainy zinc oxide. It was presumed that this cause was a difference of degree of crystallinity of the zinc oxide. It has been understood that the calcium carbonate covered with one layer of zinc oxide onto the surface has the same degree of photocatalytic ability as a zinc oxide.
  • 長澤 博司, 上条 克司, 風間 ふたば, 鈴木 喬
    2002 年 9 巻 301 号 p. 492-497
    発行日: 2002/11/01
    公開日: 2011/03/07
    ジャーナル フリー
    To clarify the disinfecting properties of lime compounds such as calcium hydroxide, calcium oxide and calcium carbonate, the kinetics of disinfection by the lime compounds were studied using a bacterium, Eschericia coli. The disinfection effects were found to be expressed by “Chick's low”. The disinfection rate constants of the lime compounds were compared with those of disinfection effect in NaOH solution. The disinfection rate constants of both systems increased with pH increasing, but the disinfection rate constants of the lime compounds appeared to be higher than those in the alkaline solution. Furthermore, the disinfection rate constants were increased with increasing specific surface area of the lime compounds. These results suggest that the contact phenomenon of the bacteria to the strong alkaline surfaces on these lime compounds is most important factor of the disinfection mechanism.
    To evaluate the disinfective efficiency of the lime compounds, the C·t values were calculated from the time for 99% disinfections and the concentrations of the disinfectants were compared with those of usual disinfectants. The lime compounds were found to be stronger disinfectants than Ag and the efficiency of the disinfection by calcium hydroxide was almost same as that by chloramine. Thus, the lime compounds seem to have the feasibility as practical water disinfectants instead of chlorine.
  • 板谷 清司, 塩原 万紀, F. Scott HOWELL
    2002 年 9 巻 301 号 p. 498-504
    発行日: 2002/11/01
    公開日: 2011/03/07
    ジャーナル フリー
    酸化マグネシウム (MgO) 粉体の焼結に及ぼすバイモーダルな粒度分布の影響について検討した.試料には一次粒子径 (平均) が11, 25, 32, 44, 57,107および261nmの7種類のMgO粉体を使用した.これらのMgO粉体を等質量 (0.75g) で混合し, 成形したあと, 1700℃で5h焼成し, 相対密度および微細構造を調べた.バイモーダルな粒度分布を有するMgO粉体を成形・焼成すると, 得られたMgO焼結体の相対密度は単一成分のMgO焼結体の相対密度 (97~98%) よりも低い値を示した.とくに, 一次粒子径が57nm以下のMgO粉体同士を混合・成形して焼成した場合に相対密度の低下は顕著に認められた.また, バイモーダルな粒度分布を有するMgO粉体を焼結すると, 単一成分のMgO焼結体の場合よりも結晶粒径が増大することがわかった.
  • 馮 慶革, 杉田 修一, 庄谷 征美, 山道 浩仁, 磯島 康雄
    2002 年 9 巻 301 号 p. 505-510
    発行日: 2002/11/01
    公開日: 2011/03/07
    ジャーナル フリー
    XRD, XRF, BET, 化学分析およびCa (OH) 2飽和溶液の伝導率等の測定方法を利用して熱処理条件, 酸処理条件ともみがら灰の結晶化, 表面特性および化学反応性について検討した.酸処理後では550~900℃の熱処理により非晶質で高比表面積 (145~311m2・g-1) のもみがら灰を得ることができ, 1000℃以上の温度では結晶化が観察された.生もみがらを酸で前処理すると, 不純物となると思われる金属成分は明暸に減少した.その結果, もみがら灰中の非晶質成分が結晶質に変化する速度が遅くなった.表面特性と化学反応性はもみがら灰調製時の熱処理温度に大きく依存し, 加熱時間の影響は小さくなることが判明した.
  • 川野 一忠, 内藤 香, 高尾 俊正, 大田 正人, 平野 克比古, 木邑 隆保
    2002 年 9 巻 301 号 p. 511-516
    発行日: 2002/11/01
    公開日: 2011/03/07
    ジャーナル フリー
    マイクロ波を用いてRBa2Cu3Oy (R=Y, La, Nd, Sm, Eu, Gd, Dy, HoとYb) 系の超伝導体の迅速合成法を研究した.合成されたRBa2Cu3Oy系の超伝導体はすべて斜方晶系であった. RがLaを除いて, Tcmagは83Kから93Kであった. RがDy, Y, Hoの場合はRに無関係にTcmagは93 Kであった.しかし, これ以外のRの場合は, イオン半径が減少しても増加してもTcmagは減少した.さらに本報では, イオン半径の異なった二つの希土類元素を含むNdxYb1-xBa2Cu3Oy系の超伝導体の研究を行った.xを0から1に変えて超伝導体の特徴を研究すると, 格子定数は, xと直線の関係にあった. xが0.2から0.4の間では, Tcmag=92 Kをもつ均一な斜方晶系超伝導体であった.一方x≧0.5の範囲では, Tcmagxの増加と共に減少してNdBa2Cu3Oy系の超伝導体の83Kになった.
  • 田中 秀樹, 滝澤 利雄, 守吉 佑介, 栗原 雅人, 丸山 哲, 石垣 隆正
    2002 年 9 巻 301 号 p. 517-525
    発行日: 2002/11/01
    公開日: 2011/03/07
    ジャーナル フリー
    Spherical phenolic resin powders with two particle sizes, i.e. the average particle sizes of 25 and 9.1 μm, were treated in Ar-H2, Ar-N2, Ar-H2-CO2 and Ar-N2-CO2 RF thermal plasma under reduced pressures of 26.6 and 53.3 kPa. The plasma-treated powders were characterized by X-ray diffractometry, scanning electron microscopy and Raman spectroscopy. The BET surface area and the content of carbon, hydrogen, oxygen and nitrogen were also measured. The plasma-treated powders were heated in-flight and carbonized through thermal decomposition, and partially evaporated. For the powder of the smaller particle size, more amount of evaporation occurred and a lot of fine powders were formed. The larger particle powder had a higher degree of crystallinity than the small particle one as examined by the X ray diffraction patterns and Raman spectra. The plasma-treated powders have a non-uniform structure, which is composed of the graphitized and amorphous structures, and the phase content depended on the particle size. Electrochemical measurements as an anode of lithium rechargeable battery were performed in 1 M LiClO4/ (ethylene carbonate+diethyl carbonate). Some powder samples of the plasma-treated powders showed higher capacity than theoretical capacity of graphite, 372 mAh/g.
  • 目 義雄, 松本 徹, 守吉 佑介
    2002 年 9 巻 301 号 p. 526-530
    発行日: 2002/11/01
    公開日: 2011/03/07
    ジャーナル フリー
    Colloidal processing of fine powders of zirconia, alumina and titania was conducted for obtaining fine-grained microstructures. Well-dispersed aqueous suspensions of the fine powders were prepared by adding appropriate amount of zirconium acetate. The suspensions were characterized by measuring particle size, zeta-potential and rheological properties. Dense green bodies of zirconia, alumina and titania were obtained by slip casting of the suspensions and further CIP treatment. Low-temperature densification was observed and dense and fine-grained sintered bodies were obtained.
  • 高木 正人
    2002 年 9 巻 301 号 p. 531-536
    発行日: 2002/11/01
    公開日: 2011/03/07
    ジャーナル フリー
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