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Jiang Y.,Institute for Materials Chemistry and Engineering | Jiang Y.,Henan University of Science and Technology | Lin X.,China University of Mining and Technology | Ideta K.,Institute for Materials Chemistry and Engineering | And 5 more authors.
Journal of Industrial and Engineering Chemistry | Year: 2014

The transformation of the Si-Al microstructures of slags, which have similar SiO2+Al2O3 and CaO contents but different SiO2/Al2O3 ratios, was quantified using multinuclear SS-NMR. Three kinds of Si Qn microstructures (Q2, Q3, and Q4), where n denotes the number of bridging oxygen linked to other Si atoms for each Q (SiO4) unit, and one Al structure (Al (IV)) were present in both slags. The Q3 percentage in two slags was increased as increase of temperature from 1200 to 1600°C. The transformation of Si-Al microstructures was interpreted by a hypothetic model of cristobalite cluster based on the crystal and Qn structure. © 2013 The Korean Society of Industrial and Engineering Chemistry.

Hu B.,Institute for Materials Chemistry and Engineering | Ago H.,Institute for Materials Chemistry and Engineering | Ago H.,Kyushu University | Ago H.,Japan Science and Technology Agency | And 3 more authors.
Journal of Physical Chemistry C | Year: 2010

With an interest in the H2O-assisted chemical vapor deposition (CVD) process, roles of H2O in tuning the diameter and chirality distributions of single-walled carbon nanotubes (SWNTs) were studied using Fe/MgObased catalysts. A controlled amount of H2O was found to narrow the diameter distribution of SWNTs by reducing the populations of small- and large-diameter nanotubes. The addition timing of H2O vapor was investigated to understand the interaction between H2O and growing nanotubes or catalyst nanoparticles. Also, the addition of a small amount of Mo in the Fe/MgO catalyst was observed to reduce the diameter distribution of SWNTs, and H2O further promoted the formation of smaller-diameter SWNTs over the Fe-Mo/ MgO catalyst. These results elucidate that the surface chemistry of catalyst nanoparticles exerted significant effects on the behaviors of H2O in the CVD process. Consequently, it is proposed that H 2O first reacts with the surface of catalyst nanoparticle, and successively plays two aspects of roles, inhibiting the agglomeration of nanoparticles and preferential etching to small-diameter nanotubes, which determine the net diameter distribution of as-grown SWNTs. © 2010 American Chemical Society.

Nakanishi S.-I.,Kyushu University | Kawamura M.,Institute for Materials Chemistry and Engineering | Sunada Y.,Institute for Materials Chemistry and Engineering | Nagashima H.,Kyushu University | Nagashima H.,Institute for Materials Chemistry and Engineering
Polymer Chemistry | Year: 2016

A new Fe(ii) complex (Me3TACN)FeBr2(κ-NCMe), which is stabilized by a weakly coordinating solvent, was prepared as an efficient and reusable catalyst for atom transfer radical polymerization (ATRP) of styrene, MMA, and BA. The complex was conveniently generated from either [(Me3TACN)Fe(μ-Br)3(Me3TACN)]+[Br]- or a mixture of FeBr2 and Me3TACN in MeCN. © The Royal Society of Chemistry 2016.

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