Search Results 1-20 of 790

  • Effect of Gas-Liquid Two-Phase Flow in a Venturi Tube on Atomization and Transportation of Coagulant  [in Japanese]

    ISHIZAKI Takahiro , KANEKO Akiko , TAKEMURA Fumio , IKE Masatoshi , ABE Yutaka

    … We used allophane as a coagulant, since it is considering that allophane obtained from nature has low environmental impact when it is added into the dam reservoir. … The objective of the present study is to propose an atomization and transportation technique for allophane with a Venturi tube and to elucidate their mechanisms. … We successfully visualized atomization behavior of allophane in detail and considered the atomization mechanisms. …

    JAPANESE JOURNAL OF MULTIPHASE FLOW 34(1), 55-63, 2020

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  • STUDY ON THE DETERMINATION OF ALLOPHANE CONTENT USING IMAGE COLOR ANALYSIS  [in Japanese]

    YOSHIDA Munehisa , KITAMURA Toshiya , SAKUHARA Yoichi , MATSUNAMI Hiroshi

    <p>火山灰質粗粒土をセメント系固化材で地盤改良するとCr(Ⅵ)の溶出量が土壌環境基準を超過する場合がある。これは対象土に非結晶質の準粘土鉱物であるアロフェンが含有していることが原因であり、アロフェン量に応じた最適な固化材の種類の選定が必要である。そこで、アロフェン含有量を現場で迅速に推定することができる測定方法を開発した。アロフェン含有量を調整した模擬土でアロフェンテス …

    Cement Science and Concrete Technology 73(1), 407-412, 2020

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  • MALDI Mass Spectrometry of Small Molecules Using Nanometer-sized Clay

    XU Jiawei , KONDO Junko N. , FUJINO Tatsuya

    … <p>Nanometer-sized clay, allophane, was used as the matrix for matrix-assisted laser desorption ionization mass spectrometry (MALDI MS) and applied to the ionization of small molecules. … First, the laser desorption ionization mass spectrum of cation-exchanged allophane was measured, and it was found that the cation exchange proceeded smoothly with increasing atomic number of alkali metals in the periodic table. …

    Analytical Sciences 36(2), 177-181, 2020

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  • Short-range-order minerals as powerful factors explaining deep soil organic carbon stock distribution: The case of a coffee agroforestry plantation on Andosols in Costa Rica

    Chevallier Tiphaine , Fujisaki Kenji , Roupsard Olivier , Guidat Florian , Kinoshita Rintaro , Filho Elias de Melo Viginio , Lehner Peter , Albrecht Alain

    … The spatial variation of soil short-range-order minerals such as allophane usually explains the variability of topsoil SOC contents, but SOC data for deeper soil layers are needed. …

    SOIL 5(2), 315-332, 2019-11

    IR 

  • The effect of monovalent anion species on the aggregation and charging of allophane clay nanoparticles

    小林 幹佳 , Chihiro Takeshita , Kotaro Masuda , Motoyoshi KOBAYASHI

    Allophane is a kind of clay mineral which has amorphous hollow spherical structure. … To clarify the dispersion, aggregation and charging behaviour of allophane in the presence of various monovalent anions, F−, Cl−, Br−, I−, BrO3−, IO3−, and SCN−, the stability ratio and electrophoretic mobility of allophane were investigated. …

    Colloids and Surfaces A: Physicochemical and Engineering Aspects (577), 103-109, 2019-09

    IR 

  • Adsorption characteristics of phosphorus in a mixed system of allophane and ferrihydrite  [in Japanese]

    Uchida Shoko , Hashimoto Yohey

    <p>日本の農地には、これまでリン肥料が過剰に施用されてきたことによって、高濃度のリンが蓄積し、作物病害の誘発など様々な問題につながっている。特に黒ボク土と呼ばれるアロフェンを含む土壌が分布する農地で、リンの過剰な蓄積が起こっている。黒ボク土には、リン吸着量の大きいフェリハイドライトも含まれている。したがって、アロフェンとフェリハイドライトへのリンの吸着特性を明らかにすることが、黒ボク …

    Abstracts of Annual Meeting of the Geochemical Society of Japan 66(0), 181, 2019

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  • Atomization and Transportation of Coagulant by a Microbubble Generator with a Venturi Tube  [in Japanese]

    ISHIZAKI Takahiro , FUJII Keita , KANEKO Akiko , TAKEMURA Humio , IKE Masatoshi , ABE Yutaka

    … We utilized allophane as a coagulant. … The purpose of this study is to develop an atomization and transportation technique for allophane using the microbubble generator with a Venturi tube. … Detailed visualization of atomization behavior of allophane in internal flow of the tube was carried out and the diameter distribution of allophane after passing through the tube was measured. …

    The Proceedings of Conference of Kanto Branch 2019.25(0), 18B01, 2019

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  • Can trees on volcanic soils acquire phosphorus adsorbed to allophane?  [in Japanese]

    Mukai Mana , Kitayama Kanehiro

    <p>火山灰土壌はその主成分の二次鉱物の非晶質鉱物類(以下アロフェン)がリンを強く吸着するので、農地などでは作物にリン欠乏を起こすと言われてきた。しかし日本の火山灰土壌に成立する森林では、樹木のリン欠乏の例の報告はない。そこで、火山灰土壌に生育する樹木はアロフェンに吸着したリンを獲得できる、という仮説を立てた。この仮説の検証のため、野外観察と栽培実験を行った。まず、火山灰土壌の特徴が見 …

    The Japanese Forest Society Congress 129(0), 342, 2018

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  • Atomization and Transportation of Coagulant using the Microbubble Generatorwith a Venturi Tube  [in Japanese]

    INOUE Yuzo , KANEKO Akiko , TAKEMURA Fumio , IKE Masatoshi , ABE Yutaka

    … We focus on allophane as a coagulant. … The purpose of this study is to develop an atomization and transportation technique for allophane with a Venturi tube. … We utilized the microbubble generator with a Venturi tube to atomize allophane. … First, we visualized internal flow of the tube and measured diameter distribution of allophane after passing through the tube. …

    JAPANESE JOURNAL OF MULTIPHASE FLOW 32(1), 89-96, 2018

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  • Stable Solidification of Silica-based Ammonium Molybdophosphate in Ceramic Matrices and Its Cesium-leaching Properties

    Wu Yan , Xu Mingliang , Wei Yuezhou , Mimura Hitoshi

    … <p>A pressing/sintering method was used for the stable solidification of spent cesium adsorbent by adding natural allophane and mordenite. …

    Chemistry Letters 47(2), 179-182, 2018

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  • Adsorption mechanism of fluorine and boron by allophane and imogolite  [in Japanese]

    宮原 英隆 , 平井 恭正 , 森本 和也 , 万福 和子 , 鈴木 正哉

    地下水・土壌汚染とその防止対策に関する研究集会講演集 23, 549-554, 2017-11-09

  • Clay composed of fraipontite, allophane, and halloysite from the Kitabira mine, Yamaguchi Prefecture, Japan  [in Japanese]

    Shirose Yohei , Uehara Seiichiro

    山口県喜多平鉱山の酸化帯より,フライポント石(Fraipontite),アロフェン,ハロイサイトからなる粘土を見出した。粘土は水色透明から白色半透明の塊~土状である。粗粒なフライポント石は,板状結晶が集合した厚さ0.1 mm程度の脈状から球状集合となり,白色~淡緑色で,断面は真珠光沢を有する。粗粒なフライポント石を含む粘土のX線回折値は001 = 7.13 Å,060 = 1.54 & …

    Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences 2017(0), 44, 2017

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  • <b>Degradation of Acetaldehyde using Allophane </b>  [in Japanese]

    NISHIKIORI Hiromasa , NAKAMURA Yusuke , MATSUKURA Minoru , SAMBAYASHI Masayuki

    … <p>Degradation of acetaldehyde using natural clay mineral, allophane was investigated in the dark and during UV irradiation in order to confirm its catalytic activity. … Allophane should absorb UV light and convert its energy to heat energy because it is not a photocatalyst. … The only surface of the allophane particle reached a high temperature. … The acetaldehyde adsorbed on the allophane particle was degraded due to its catalytic activity.</p> …

    Journal of Environmental Chemistry 27(4), 121-127, 2017

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  • Role of Clays and Other Inorganic Materials in Soils, Fertilizers, Agriculture and Forestry  [in Japanese]

    Nanzyo Masami

    … Looking back on the past 60 years, allophane, imogolite and pedogenic opals were discovered in volcanic ash soils; …

    Journal of the Clay Science Society of Japan (in Japanese) 55(3), 88-96, 2017

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  • ELUTION CONTROL OF Cr(Ⅵ)FROM VOLCANIC COARSE-GRAINED SOIL IMPROVED WITH CEMENT  [in Japanese]

    YOSHIDA Munehisa , KITAMURA Toshiya , KATSUSHIMA Hideyuki , KONDO Keisuke

    <p>静岡県東部で富士山を起源とするスコリアを含む火山灰質粗粒土にセメント系固化材を使用したところ、アロフェンが原因となるCr(Ⅵ)溶出の土壌環境基準超過を確認した。大規模な道路土工の現場で現地発生土を有効利用する必要があることから、セメント系改良土からのCr(Ⅵ)溶出を、生石灰添加で抑制する方法を検討した。現地採取した土壌試料を用いて、土壌試料の粘土分とC …

    Cement Science and Concrete Technology 71(1), 661-666, 2017

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  • A study on removal of phosphorus from water using low-cost ceramics  [in Japanese]

    Kubo Suguru , Senda Makiko , Kuzuha Yasuhisa

    本研究は、環境水中のリンを除去・回収するため,吸着法に注目した.今川(2016)が作成したセラミックス吸着剤のリン吸着能の向上・実用化への技術の検討した.作成した吸着剤は以下の3種である.「A:黒ボク土と鹿沼土を質量比3:2で混合」,「B:黒ボク土100%」,「C:鹿沼土100%」.実験は,吸着剤の粒径,添加量,焼成温度の条件を変えて行った. Aは,BとCと粒径を揃え,表面積を極力同じにすることで …

    Proceeding of Annual Conference 30(0), 96, 2017

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  • Reaction Kinetics on Allophane–Titania Nanocomposite Electrodes for Photofuel Cells

    Nishikiori Hiromasa , Furuichi Naoyuki , Teshima Katsuya , Yamashita Hiromi

    … <p>The reaction process on allophane-dispersing titania electrodes of photofuel cells was investigated in electrolytes containing glucose as the fuel material at different concentrations. … A low allophane amount improved the glucose adsorption–degradation relay on the electrodes. … The dispersion process of the glucose molecules adsorbed on the allophane to the titania was the rate-determining step in the present systems. …

    Chemistry Letters 46(5), 659-661, 2017

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  • Photoelectrochemical properties of dye-dispersing allophane-titania composite electrodes

    Nishikiori Hiromasa , Kanada Naohiro , Setiawan Rudi Agus , Morita Koji , Teshima Katsuya , Fujii Tsuneo

    … Dye-dispersing allophane-titania composite electrodes were prepared from titanium alkoxide sols containing dye and allophane. … The photocurrent values in the UV range decreased with an increase in the allophane content, whereas those in the visible range were increased by adding 1.0% (Al/Ti ratio) allophane. …

    APPLIED CLAY SCIENCE (107), 138-144, 2015-04

    IR 

  • Fundamental Study on New Opportunities for Innovative Drug Delivery System of Natural Clay Allophane  [in Japanese]

    荒川 修一

    財団法人日本板硝子材料工学助成会成果報告書 Nippon Sheet Glass Foundation for Materials Science and Engineering report (36), 1-5, 2015

  • Synthesis and Identification of Allophane from Waste Blast Furnace Slag

    Hongo Teruhisa

    … In the current study, the undissolved residue was successfully used as raw material for the synthesis of allophane, which is a functional material as pollutants adsorbent. …

    ISIJ International 55(12), 2700-2702, 2015

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