Pub Date : 2002-01-01DOI: 10.1246/NIKKASHI.2002.485
S. Nakayama, T. Terada, S. Kakita, Shinji Imai, M. Sakamoto
The perovskite oxide LaCoO3 was synthesized by three different preparative methods i.e., the calcination of a mixture of La2O3 and CoO (La–Co–O) and pyrolysis of a co-precipitated precursor (La–Co–ox), La2 (C2O4)3 · xH2O + CoC2O4 · yH2O, and a heteronuclear complex (La–Co–CN), La[Co(CN)6] · 5H2O. The obtained powders were characterized by thermogravimetric analysis, infrared spectroscopy, powder X-ray diffraction, scanning electron microscopy and specific surface area measurements. The formation of LaCoO3 single phase is clearly recognized for La–Co–O, La–Co–ox and La–Co–CN at temperatures above 1000, 1200 and 600 °C, respectively. The nano-sized LaCoO3 powder was obtained at low temperatures by pyrolysis of La–Co–CN. The mean particle diameter of La–Co–CN calcined at 600 °C for 2 h was 72 nm.
采用La2O3与CoO的混合物(La - Co - o)煅烧、共沉淀前驱体(La - Co - ox) La2 (C2O4)3·xH2O + CoC2O4·yH2O和异核配合物(La - Co - CN) La[Co(CN)6]·5H2O三种不同的制备方法合成了钙钛矿氧化物LaCoO3。采用热重分析、红外光谱、粉末x射线衍射、扫描电镜和比表面积测量等方法对所得粉体进行了表征。La-Co-O、La-Co-ox和La-Co-CN分别在1000、1200和600℃以上的温度下形成LaCoO3单相。采用低温热解法制备了纳米级LaCoO3粉体。600℃煅烧2 h后的La-Co-CN平均粒径为72 nm。
{"title":"Perovskite Oxide LaCoO3 Prepared by Solid-state Reaction, Pyrolysis of a Co-Precipitated Precursor or Pyrolysis of a Heteronuclear Complex.","authors":"S. Nakayama, T. Terada, S. Kakita, Shinji Imai, M. Sakamoto","doi":"10.1246/NIKKASHI.2002.485","DOIUrl":"https://doi.org/10.1246/NIKKASHI.2002.485","url":null,"abstract":"The perovskite oxide LaCoO3 was synthesized by three different preparative methods i.e., the calcination of a mixture of La2O3 and CoO (La–Co–O) and pyrolysis of a co-precipitated precursor (La–Co–ox), La2 (C2O4)3 · xH2O + CoC2O4 · yH2O, and a heteronuclear complex (La–Co–CN), La[Co(CN)6] · 5H2O. The obtained powders were characterized by thermogravimetric analysis, infrared spectroscopy, powder X-ray diffraction, scanning electron microscopy and specific surface area measurements. The formation of LaCoO3 single phase is clearly recognized for La–Co–O, La–Co–ox and La–Co–CN at temperatures above 1000, 1200 and 600 °C, respectively. The nano-sized LaCoO3 powder was obtained at low temperatures by pyrolysis of La–Co–CN. The mean particle diameter of La–Co–CN calcined at 600 °C for 2 h was 72 nm.","PeriodicalId":19311,"journal":{"name":"Nippon Kagaku Kaishi","volume":"92 1","pages":"485-488"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76394556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Polymerization of Cyclic Ethers Initiated by the Reaction of Cyclic Ether with Hexafluoropropylene Oxide.","authors":"Yasuyuki Masubuchi, T. Hagiwara, Youichi Ikegaya, S. Kawata, N. Yonezawa","doi":"10.1246/NIKKASHI.2002.365","DOIUrl":"https://doi.org/10.1246/NIKKASHI.2002.365","url":null,"abstract":"フッ素含有率の高いヘキサフルオロプロピレンオキシド(HFPO)と環状エーテルとの反応による重合について検討を行った.モノマーとして六員環エーテルであるテトラヒドロピラン(THP)を用いたときには,重合体は得られなかった.四員環エーテルであるオキセタン,および三員環エーテルであるプロピレンオキシド(PO)をモノマーとして用いたときに重合生成物が得られた. モノマーとしてオキセタンを用いたときに,最も高分子量の重合体を得ることができ,その数平均分子量は4.8 × 103であった.これは,オキセタンの開環重合反応性が,環状エーテルの中で最も高いためであると考えられる. モノマーとしてプロピレンオキシド(PO)を用いたときに得られる重合生成物は,他の環状エーテルをモノマーとしたときに得られる重合生成物とは異なる構造であった.これは,POが他の環状モノマーに比べてかさ高いこと,およびPOの環の開裂の方向がα,βの双方で起るためであると考えられる.","PeriodicalId":19311,"journal":{"name":"Nippon Kagaku Kaishi","volume":"33 1","pages":"365-369"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87275489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Determination of the Pesticides in Environmental Water by GC/MS with Disk-format Solid Phase Extraction Method.","authors":"H. Kitami, Tetsuo Watanabe, T. Kitahara, J. Takano","doi":"10.1246/NIKKASHI.2002.183","DOIUrl":"https://doi.org/10.1246/NIKKASHI.2002.183","url":null,"abstract":"本研究では,ゴルフ場規制農薬37種類を測定対象物質として着目し,ディスク型固相抽出法を用いて,その分析法の検討を行った.その際,排水基準に定められている揮発性有機化合物11種類に含まれていないアセトンを抽出溶媒として用いることに着目し,その有効性について調査した.その結果,蒸留水,河川水,降水を用いた添加回収試験において,アセトンで抽出しヘキサンに転溶する方法(アセトン/ヘキサン転溶法)は,排水基準項目に定められているジクロロメタンを使用しないで済むことから,実験室環境のジクロロメタンの混入を気にせずに前処理を行うことができる上に,回収率および変動係数の面でも優れていることから,かなり有効な抽出方法の一つであることがわかった. また本測定方法を用いて,東京都町田市において2000年7月から2000年12月までの期間,ゴルフ場規制農薬37種類の環境モニタリング調査を河川水,降水について行った.その結果,河川水,降水,すべて全農薬37種類において不検出であった.","PeriodicalId":19311,"journal":{"name":"Nippon Kagaku Kaishi","volume":"82 1","pages":"183-188"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76115703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Improvement of the Specific Power of Paste-Type Positive Electrodes for Ni-MH Batteries.","authors":"S. Morishita, Y. Kondo, S. Towata","doi":"10.1246/NIKKASHI.2002.93","DOIUrl":"https://doi.org/10.1246/NIKKASHI.2002.93","url":null,"abstract":"ニッケル-水素(Ni–MH)電池で用いられるペースト式正極を高出力化するため,反応晶析法にて合成した種々の大きさの正極活物質粒子を用いて粒径と正極特性との関係を検討した.正極活物質の粒径を最適化することにより正極の出力密度を約3倍向上させることができた.得られたペースト式正極の出力密度は焼結式正極と同等で,放電容量は約20%増加した.","PeriodicalId":19311,"journal":{"name":"Nippon Kagaku Kaishi","volume":"51 1","pages":"93-96"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76697861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Effect of Film Forming Agent on Particle Coalescence in Polymer Emulsion Films.","authors":"Tooru Sugawara, H. Hosokawa, T. Iida","doi":"10.1246/NIKKASHI.2002.47","DOIUrl":"https://doi.org/10.1246/NIKKASHI.2002.47","url":null,"abstract":"メタクリル酸メチルーアクリル酸ブチルーアクリル酸共重合体エマルションのポリマー粒子の融着に及ぼす成膜助剤の影響を調べるため,メタクリル酸メチルーアクリル酸ブチルーアクリル酸共重合体エマルションに種々の成膜助剤を添加して作製した皮膜の融着状態を検討した.その結果,成膜助剤とポリマーの溶解性パラメーターが近く,成膜助剤の沸点が高いほどポリマー粒子の融着が促進された.また,成膜助剤とポリマーの溶解性パラメーターが近く,成膜助剤の沸点が高いほど皮膜表面の算術平均粗さが小さくなったが,粒子の球状の形が消失するまでは融着が進まなかった.さらにΔMFTと皮膜のRaの間に相関性があることが示唆された.","PeriodicalId":19311,"journal":{"name":"Nippon Kagaku Kaishi","volume":"107 1","pages":"47-52"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72838047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Inclusion Effects of Cyclodextrin on the Intramolecular Fluorescence Quenching of Naphthylalanine Derivatives.","authors":"K. Miyoshi, K. Kubo, Tetsutaro Igarashi, T. Sakurai","doi":"10.1246/NIKKASHI.2002.333","DOIUrl":"https://doi.org/10.1246/NIKKASHI.2002.333","url":null,"abstract":"β-シクロデキストリン(β-CDx)あるいはγ-シクロデキストリン(γ-CDx)存在下で測定された標題化合物のUV吸収スペクトル,蛍光スペクトル,円二色性スペクトルおよび蛍光寿命のデータに基づいて,分子内蛍光消光反応に及ぼすシクロデキストリン包接効果が解析された.β-CDx空洞は2-ナフチルアラニンモデル化合物のナフタレン環をアキシアルに取り込み,蛍光消光速度を顕著に低下させることが判明した.この結果は,発光消光に対する“through space”機構を支持する強い証拠を提供する.しかしながら,β-CDxと比較してより大きな空洞を有するγ-CDxはこのモデル化合物の蛍光消光反応にわずかな影響しか及ぼさなかった.一方,1-ナフチルアラニンモデル化合物はβ-CDxと包接錯体を形成せず,また,γ-CDx空洞は1-ナフチル基をアキシアルとエクアトリアルの両方の様式で包接し,結果として蛍光消光の速度を大きく減少させることはできなかった.","PeriodicalId":19311,"journal":{"name":"Nippon Kagaku Kaishi","volume":"41 1","pages":"333-337"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78230744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Preparation of a Precursor Solution for SiO2 Film Formation and Its Application to the Formation of Au Cluster-dispersed SiO2 Films.","authors":"C. Mochizuki, Mitsunobu Sato, Isao Nakamura, Tomohiro Matsubara, Takeshiro Yoshida, Tetsuya Otsuki","doi":"10.1246/NIKKASHI.2002.135","DOIUrl":"https://doi.org/10.1246/NIKKASHI.2002.135","url":null,"abstract":"エタノール中で,テトラエトキシシランとグルコースを反応させ,糖のケイ素に対する錯形成を利用したアルコキシドの加水分解の制御によって,安定なSiO2膜形成用プレカーサー溶液を調整した.ジエチルアミンを含む最終溶液は,スピンコート法によって石英ガラス基板に対して均一に塗布され,600 °C以上の焼成により,膜厚約500 nmの透明で亀裂のないSiO2膜を与えた.600 °Cおよび1000 °Cで焼成した膜のXPSの測定から,焼成膜中に窒素は残存しないことを確認した.プレカーサー(前駆物質)溶液から粉を得て,TG-DTA測定により熱的性質も検討した.また,得られたプレカーサー溶液にグラフトポリマーで安定化した金クラスター含有アルコール溶液を,ケイ素に対する金の物質量の比(Au/Si)を0.01–0.1の範囲で混合し,金クラスター分散SiO2膜の形成についてさらに検討した.得られたクラスター分散SiO2膜の金クラスターに基づく表面プラズモン共鳴バンドは,金含有率の増大に比例したブルーシフトを示した.金クラスターの結晶子サイズを,膜のXRDから検討し,金含有率に依存しないことを明らかとした.","PeriodicalId":19311,"journal":{"name":"Nippon Kagaku Kaishi","volume":"27 1","pages":"135-140"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78850428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}