巻号一覧
前身誌
50 巻, 5 号
選択された号の論文の3件中1～3を表示しています
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論文
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高井 千加, 河尻 史和, 藤 正督2013 年 50 巻 5 号 p. 322-331
発行日: 2013/05/10
公開日: 2013/06/28
ジャーナル フリーIn order to disperse SnO2 nanoparticle on SiO2 substrate surface, reaction control of SnO2 precursor, consideration of interaction between the precursor and SiO2 surface, and formation of homogeneous reaction field on the SiO2 substrate were attempted. Starting from SnCl4 (aq) provides SnO2 single nanoparticles deposited on SiO2 through adsorption of Sn4+ on SiO2 surface during separation into SiO2 cake and un-reacted SnCl4 (aq) by filtration. SnCl4 (aq) remains in small spaces in SiO2 aggregates and can be passed fast by large spaces among the aggregates. While, dispersed SiO2 nanoparticles makes uniform cake where SnCl4 (aq) penetrates without residues. After calcinations of both composites, inhomogeneous SnO2 depositions covered over silica aggregates while fine SnO2 nanoparticle deposited on each silica surface. When NH3 (aq) added in SnCl4 (aq), fast growing of SnO2 through Sn(OH)4 occurs separately from silica surface due to little interaction between Sn(OH)4 and silica. A chelate solution of SnCl4 (aq) and acetylacetnate provided uniform SnO2 nanoparticle on silica surface even silica substrate aggregates. Because interaction between chelate and silica surface, steric hindrance derived from chelate ligand, could prevent from aggregation of the deposited SnO2 nanopaticle.抄録全体を表示PDF形式でダウンロード (2193K)
解説
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三野 泰志, 渡邉 哲, 宮原 稔2013 年 50 巻 5 号 p. 332-341
発行日: 2013/05/10
公開日: 2014/09/10
ジャーナル 認証ありConvective self-assembly technique is of growing importance as a robust technique to arrange various colloidal particles without any templates. Here we focus on stripe pattern formation by the convective self-assembly technique. To unveil the mechanism of the stripe formation process, we employed an in-situ observation of the variation of meniscus shape during the particle assembly process. The observation revealed a following new stripe formation mechanism, which is different from the "depinning" model. A meniscus is elongated downward to be concave toward a substrate as the solvent evaporation progresses. The convective flow toward the meniscus tip accelerates the deformation of the meniscus, resulting in the rupture of liquid film at the thinnest point of the meniscus.抄録全体を表示PDF形式でダウンロード (2485K)
解説 実用環境技術シリーズ
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林 浩志2013 年 50 巻 5 号 p. 342-347
発行日: 2013/05/10
公開日: 2014/09/10
ジャーナル 認証ありRemoval of toxic elements in effluent at low concentration is difficult technique and an effective method has not been established. This paper describes a novel water treatment process that composeds of the following processes ; addition of divalent and trivalent metal ions, conditioning of the slurry with alkaline reagent, neutralizing reaction, returning the settled slurry and gravitational settling of the solids. This neutralization-sedimentation system with slurry returning process allows the formation of so-called Layered Double Hydroxide (LDH) precipitates, which play key roles in removing toxic elements. In the selenate removal process, Green Rust (GR), Fe(II)-Fe(III) type LDH compound, reduce selenate to elemental selenium in anoxic condition, while GR is consequently oxidized to Magnetite (Fe3O4). The black-colored magnetic slurry containing GR and Magnetite contributes to the removal of selenate.
In the fluorine removal process, Hydrotalcite, Mg(II)-Al(III) type LDH, surrounds the neutralizer MgO particle, thereby forming a core-shell structure. Optimum fluorine removal ratio reaches 95%, where initial fluorine concentration 15 mg/L decreases below the national environmental standard, 0.8 mg/L. This proposed processe serves as alternative treatment technique for low concentrated toxic elements.抄録全体を表示PDF形式でダウンロード (938K)
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