The Experts below are selected from a list of 5067 Experts worldwide ranked by ideXlab platform
Qian Zhang - One of the best experts on this subject based on the ideXlab platform.
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synergistic effects in extraction and separation of Praseodymium iii and neodymium iii with 8 hydroxyquinoline in the presence of 2 ethylhexyl phosphonic acid mono 2 ethylhexyl ester
Industrial & Engineering Chemistry Research, 2007Co-Authors: Dongbei Wu, Qian ZhangAbstract:In this paper, the extraction behaviors of Praseodymium(III) from an aqueous chloride−acetate medium, using 8-hydroxyquinoline (HQ), 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (P507, HL) and their mixture, were studied, using ultraviolet−visible light (UV−vis) absorption spectroscopy. The binary equilibrium constants (log K1, log K2) for the complex formation PrL3·3HL and PrQ3 in the organic phase were determined to be −1.98 for 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester and −11.54 for HQ, respectively. The overall equilibrium constant (log K12) for the ternary species PrQ2L10H9 was estimated to be 6.01. The largest synergistic enhancement factor was calculated to be 5.39, corresponding to a HQ:P507 concentration ratio of 3:7 at pH 3.6. When P507 was added into HQ, the entire stripping could be achieved at an aqueous sulfuric acid concentration of ∼0.02 M. In addition, for Praseodymium(III) and neodymium(III), the mixture of HQ and P507 showed higher separation selectivity than HQ or P...
Toshiyuki Masui - One of the best experts on this subject based on the ideXlab platform.
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synthesis and characterization of bi4zr3o12 as an environment friendly inorganic yellow pigment
Dyes and Pigments, 2017Co-Authors: Takashi Tsukimori, Ryohei Oka, Toshiyuki MasuiAbstract:Abstract Bi 4 Zr 3 O 12 was synthesized as a novel environment-friendly inorganic yellow pigment by a conventional solid state reaction using Bi 2 O 3 and ZrO 2 , and the optical properties of the pigment were characterized by UV-vis reflectance spectroscopy. The Bi 4 Zr 3 O 12 sample selectively absorbed the visible and ultraviolet light at the wavelength shorter than 450 nm. As a result, the Bi 4 Zr 3 O 12 sample exhibited a yellow color. The most vivid reddish yellow color was obtained for the sample synthesized at 800 °C. The yellowness value ( b* ) in the CIE L*a*b* system was comparable to that of a commercial Praseodymium yellow pigment, while the redness value ( a* ) was larger. Consequently, the color of Bi 4 Zr 3 O 12 was slightly reddish in contrast to that of slightly greenish Praseodymium yellow, and, therefore, the Bi 4 Zr 3 O 12 pigment should be a novel environment-friendly inorganic reddish yellow pigment.
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synthesis and characterization of bi4zr3o12 as an environment friendly inorganic yellow pigment
Dyes and Pigments, 2017Co-Authors: Takashi Tsukimori, Toshiyuki MasuiAbstract:Abstract Bi 4 Zr 3 O 12 was synthesized as a novel environment-friendly inorganic yellow pigment by a conventional solid state reaction using Bi 2 O 3 and ZrO 2 , and the optical properties of the pigment were characterized by UV-vis reflectance spectroscopy. The Bi 4 Zr 3 O 12 sample selectively absorbed the visible and ultraviolet light at the wavelength shorter than 450 nm. As a result, the Bi 4 Zr 3 O 12 sample exhibited a yellow color. The most vivid reddish yellow color was obtained for the sample synthesized at 800 °C. The yellowness value ( b* ) in the CIE L*a*b* system was comparable to that of a commercial Praseodymium yellow pigment, while the redness value ( a* ) was larger. Consequently, the color of Bi 4 Zr 3 O 12 was slightly reddish in contrast to that of slightly greenish Praseodymium yellow, and, therefore, the Bi 4 Zr 3 O 12 pigment should be a novel environment-friendly inorganic reddish yellow pigment.
Dongbei Wu - One of the best experts on this subject based on the ideXlab platform.
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synergistic effects in extraction and separation of Praseodymium iii and neodymium iii with 8 hydroxyquinoline in the presence of 2 ethylhexyl phosphonic acid mono 2 ethylhexyl ester
Industrial & Engineering Chemistry Research, 2007Co-Authors: Dongbei Wu, Qian ZhangAbstract:In this paper, the extraction behaviors of Praseodymium(III) from an aqueous chloride−acetate medium, using 8-hydroxyquinoline (HQ), 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (P507, HL) and their mixture, were studied, using ultraviolet−visible light (UV−vis) absorption spectroscopy. The binary equilibrium constants (log K1, log K2) for the complex formation PrL3·3HL and PrQ3 in the organic phase were determined to be −1.98 for 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester and −11.54 for HQ, respectively. The overall equilibrium constant (log K12) for the ternary species PrQ2L10H9 was estimated to be 6.01. The largest synergistic enhancement factor was calculated to be 5.39, corresponding to a HQ:P507 concentration ratio of 3:7 at pH 3.6. When P507 was added into HQ, the entire stripping could be achieved at an aqueous sulfuric acid concentration of ∼0.02 M. In addition, for Praseodymium(III) and neodymium(III), the mixture of HQ and P507 showed higher separation selectivity than HQ or P...
Takashi Tsukimori - One of the best experts on this subject based on the ideXlab platform.
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synthesis and characterization of bi4zr3o12 as an environment friendly inorganic yellow pigment
Dyes and Pigments, 2017Co-Authors: Takashi Tsukimori, Ryohei Oka, Toshiyuki MasuiAbstract:Abstract Bi 4 Zr 3 O 12 was synthesized as a novel environment-friendly inorganic yellow pigment by a conventional solid state reaction using Bi 2 O 3 and ZrO 2 , and the optical properties of the pigment were characterized by UV-vis reflectance spectroscopy. The Bi 4 Zr 3 O 12 sample selectively absorbed the visible and ultraviolet light at the wavelength shorter than 450 nm. As a result, the Bi 4 Zr 3 O 12 sample exhibited a yellow color. The most vivid reddish yellow color was obtained for the sample synthesized at 800 °C. The yellowness value ( b* ) in the CIE L*a*b* system was comparable to that of a commercial Praseodymium yellow pigment, while the redness value ( a* ) was larger. Consequently, the color of Bi 4 Zr 3 O 12 was slightly reddish in contrast to that of slightly greenish Praseodymium yellow, and, therefore, the Bi 4 Zr 3 O 12 pigment should be a novel environment-friendly inorganic reddish yellow pigment.
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synthesis and characterization of bi4zr3o12 as an environment friendly inorganic yellow pigment
Dyes and Pigments, 2017Co-Authors: Takashi Tsukimori, Toshiyuki MasuiAbstract:Abstract Bi 4 Zr 3 O 12 was synthesized as a novel environment-friendly inorganic yellow pigment by a conventional solid state reaction using Bi 2 O 3 and ZrO 2 , and the optical properties of the pigment were characterized by UV-vis reflectance spectroscopy. The Bi 4 Zr 3 O 12 sample selectively absorbed the visible and ultraviolet light at the wavelength shorter than 450 nm. As a result, the Bi 4 Zr 3 O 12 sample exhibited a yellow color. The most vivid reddish yellow color was obtained for the sample synthesized at 800 °C. The yellowness value ( b* ) in the CIE L*a*b* system was comparable to that of a commercial Praseodymium yellow pigment, while the redness value ( a* ) was larger. Consequently, the color of Bi 4 Zr 3 O 12 was slightly reddish in contrast to that of slightly greenish Praseodymium yellow, and, therefore, the Bi 4 Zr 3 O 12 pigment should be a novel environment-friendly inorganic reddish yellow pigment.
P S Chung - One of the best experts on this subject based on the ideXlab platform.
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Praseodymium doped alkali bismuth gallate glasses
Journal of The Optical Society of America B-optical Physics, 2000Co-Authors: S Q Man, E Y B Pun, P S ChungAbstract:We propose and demonstrate alkali bismuth gallate glasses as suitable hosts for the rare earth Praseodymium (Pr3+) operating at 1.3-µm wavelength. The structure of the glasses was investigated by Raman spectroscopy. The optical absorption and the photoluminescence properties of Pr3+ in these glasses were characterized. The Raman spectrum shows two strong peaks, at 134 and 381 cm-1, and a weak peak at 660 cm-1. The results indicate that bismuth (Bi3+) and gallium (Ga3+) cations do take part in the formation of the glass network. The emission from the Pr3+: 1G4→3H5 transition is at 1.34-µm wavelength, and the spectral bandwidth is 120 nm, which is wider than those of fluoride and chalcogenide glasses. The lifetime of the 1G4 level is ∼78 µs, and the quantum efficiency is ∼17.4%, which is higher than that in fluoride glasses.
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alkali bismuth gallate glasses for 1 3 µm planar optical amplifiers
Integrated Photonics Research (1999) paper RMF2, 1999Co-Authors: S Q Man, E Y B Pun, P S ChungAbstract:At present, there are three principal rare earth candidates for 1.3 µm optical amplifiers: neodymium (Nd3+), Praseodymium (Pr3+) and dysprosium (Dy3+).