Surface characterization of activated alumina powder through the mechano-chemical treatment for fabrication of non-fired ceramics
Takashi Shirai,Apiluck Eiad-Ua,Apiluck Eiad-Ua,Tran Thi Thu Hien,Tran Thi Thu Hien,Masayoshi Fuji +5 more
TLDR
In this article, the bonding and activity of the atoms near the surface were investigated by spectroscopic analysis of desorption of the adsorbed water molecules, a convenient and quantitative method.Abstract:
Functional ceramics were synthesized using ceramic powders activated by mechanochemical processing. The activated powders were dispersed in an alkali-containing solvent to dissolve the metallic ions at the powder surface and effect re-precipitation between the grains. The “non-firing ceramic process” afforded high-strength ceramic solids without the need for calcination. The key step in this technique is surface activation of the ceramic powders through mechanochemical processing. We investigated the bonding and activity of the atoms near the surface by spectroscopic analysis of desorption of the adsorbed water molecules, a convenient and quantitative method. The powder surface contained an increased number of uncoordinated defects after mechanochemical processing, and powders with high compact strength showed high activity and had high surface AlV content. Diffuse reflectance infrared Fourier transform measurements of the desorption of water molecules allowed for easy and rapid determination of differences in the surface activity, which was not possible when using alternative analysis methods.read more
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Molecular Dynamics Study on SiO2 Interfaces of Nonfiring Solids
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Molecular Dynamics Analysis on Silica Interface Modeled in Surface Grinding Process for Non-Firing Solidification
Tomohiro Sato,Atsuto Kubota,Ken-ichi Saitoh,Masayoshi Fuji,Chika Takai,H. C. O. Sena,Masanori Takuma,Toshimasa Takanohashi +7 more
TL;DR: In this article , a molecular dynamics model that simulated grinding and calculated the activation of the silica surface was set up, and it was suggested that continuous energy input is more effective than local energy input to the surface when reproducing surface activity.
References
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Infrared spectroscopy study of the nature and reactivity of a hydrate coverage on the surface of γ-Al2O3
TL;DR: In this article, the absorption bands of γ-Al2O3 at 1640-1350 cm−1 were analyzed and attributed to water molecules, either physically adsorbed or coordinatively bonded to definite incompletely coordinated aluminium ions on the oxide surface.
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Aluminas Rehydration and Dehydration
TL;DR: In this article, results on the Al2O3-interactions were critically examined and the synthesis of alumina precursors rich in structural defects can be operated in an aqueous solution containing ligands with high affinity for % MathType!MTEF!2!1!+- % feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9g