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RISS 인기검색어
- 검색키워드
- 저자 : Hiroaki Onoda (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Preparation of nickel phosphates with various acidic and basic compounds
Hiroaki Onoda,Keiichiro Asai,Atsushi Takenaka 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.4
Malonic acid, propionic acid, glycine, n-butylamine, and urea were added to the preparation of nickel phosphate from nickel nitrate and phosphoric acid solutions. These additives were selected from the viewpoint of the functional groups, in short, both acidic sites, one-sided acidic site, acidic and basic sites, one-sided basic site, and both basic sites. Nickel phosphate was not obtained by the addition of glycine. The Ni/P ratio became larger by the addition of n-butylamine. The effect of the addition of acidic and basic compounds was studied on the chemical composition, powder and functional properties of nickel phosphate materials.
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The synthesis and properties of bulk lanthanum phosphates obtained by hydrothermal hot pressing
Hiroaki Onoda 한양대학교 세라믹연구소 2012 Journal of Ceramic Processing Research Vol.13 No.5
Bulk samples of lanthanum phosphates were synthesized in a hydrothermal hot pressing process. In this process, the pressing temperature, pressure, and the volume of water were varied to improve the density and various strengths. The strength of the bulk samples was estimated from drilling and ultrasonic treatments, and the residual ratio in hydrofluoric acid. Lanthanum phosphate formed the porous bulk samples with about 60% filling factor, which were calculated from the real and theoretical densities. By heating the lanthanum phosphate before the pressing, the maximum diameter became larger of the phosphate pellets without cracking. Lanthanum phosphate bulk samples gave a high residual ratio in hydrofluoric acid. The hydrothermal hot pressing process is a useful method to obtain the bulk samples of lanthanum phosphate.
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Formation of nano-pores on inorganic phosphate particles by the addition of urea
Hiroaki Onoda,Isao Tanaka 한양대학교 세라믹연구소 2007 Journal of Ceramic Processing Research Vol.8 No.2
It is important to control the powder conditions, such as porous, globular, etc., for application of such materials. In the fields of the synthesis of inorganic materials, the addition of urea etc. gave some possibility to obtain a large specific surface area, without a change of chemical composition. Materials containing urea became porous by heating because urea decomposed to ammonia and carbon dioxide. In this study, various phosphates were prepared in aqueous solutions with and without the addition of urea. The precipitation obtained was estimated by thermogravimetry-differential thermal analysis, X-ray diffraction, and Fourier transform infrared spectroscopy. The powder properties of phosphates were studied in terms of specific surface area, pore size distribution, particle size distribution, and scanning electron microscopy images. The influence of the added urea is discussed for the development of inorganic phosphate materials. It is important to control the powder conditions, such as porous, globular, etc., for application of such materials. In the fields of the synthesis of inorganic materials, the addition of urea etc. gave some possibility to obtain a large specific surface area, without a change of chemical composition. Materials containing urea became porous by heating because urea decomposed to ammonia and carbon dioxide. In this study, various phosphates were prepared in aqueous solutions with and without the addition of urea. The precipitation obtained was estimated by thermogravimetry-differential thermal analysis, X-ray diffraction, and Fourier transform infrared spectroscopy. The powder properties of phosphates were studied in terms of specific surface area, pore size distribution, particle size distribution, and scanning electron microscopy images. The influence of the added urea is discussed for the development of inorganic phosphate materials.
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Synthesis and electrical conductivity of bulk tetra-valent cerium pyrophosphate
Hiroaki Onoda,Yousuke Inagaki,Akihide Kuwabara,Naoto Kitamura,Koji Amezawa,Atsushi Nakahira,Isao Tanaka 한양대학교 세라믹연구소 2010 Journal of Ceramic Processing Research Vol.11 No.3
Tetra-valent cerium pyrophosphate was synthesized from cerium oxide and phosphoric acid by heating. The sintering processes, pressure-less sintering (PLS), spark plasma sintering (SPS), and hydrothermal hot pressing (HHP), were attempted to form bulk pyrophosphate. Furthermore, the electrical conductivity of bulk cerium pyrophosphate was investigated. Tetravalent cerium pyrophosphate was synthesized by heating at 700 oC for 20 hours. The hydrothermal hot pressing process was a suitable method to synthesize bulk tetra-valent cerium phosphate.
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