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Volume 53 (1999)
- Issue 6 Pages 409-
- Issue 5 Pages 320-
- Issue 4 Pages 224-
- Issue 3 Pages 132-
- Issue 2 Pages 70-
- Issue 1 Pages 2-
Volume 53, Issue 2
Displaying 1-6 of 6 articles from this issue
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Tomohiro SHISHIME1999 Volume 53 Issue 2 Pages 70-77
Published: 1999
Released on J-STAGE: February 19, 2013
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Yoshio SUZUKI1999 Volume 53 Issue 2 Pages 78-83
Published: 1999
Released on J-STAGE: February 19, 2013
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Masana OGATA, Kuniyasu FUJISAWA1999 Volume 53 Issue 2 Pages 84-94
Published: 1999
Released on J-STAGE: February 19, 2013
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Masaaki YAMAGAMI1999 Volume 53 Issue 2 Pages 95-98
Published: 1999
Released on J-STAGE: February 19, 2013
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Kenji UKAI, Takao MIZUNO, Ken TOYOKURA1999 Volume 53 Issue 2 Pages 99-106
Published: 1999
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSThe effect of heat of solution of calcium chloride crystal on precipitated calcium carbonate by reaction between the calcium chloride crystal and the sodium carbonate solution was studied. In this reaction system, polymorphism phenomenon of calcium carbonate was affected by the heat of solution of the calcium chloride crystal, and calcite precipitated dominantly by the addition of calcium chloride anhydrate with the same molar amount of added crystals. In the case of anhydrate crystal addition, calcite precipitated dominantly in an operating temperature range of 298 K to 328 K. The number of precipitated calcite is proportional to the amount of added calcium chloride crystal, each having rise to the 1.3rd power. The effect of agitation speed on the precipitated calcite was also discussed.View full abstractDownload PDF (5043K) -
Satoshi YANASE, Takao OI1999 Volume 53 Issue 2 Pages 107-114
Published: 1999
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSHydration of lithium ions in an aqueous ion-exchange system was studied by means of semi-empirical moleculer orbital PM3tm calculations. The geometries of Li(H2O)m+ (m=3-6), models of hydrated lithium ions in the solution phase, and C6H5-SO3-...Li(H2O)m+ (m=3-6), models in the resin phase, were optimized, and various energies were calculated. The results obtained by calculations showed that the Li+-O bond of the hydrated Li+ species was larger in length and, correspondingly, the stabilization energy of hydration was smaller in the resin phase than in the solution phase. Li(H2O)4+ was found to have two conformations with nearly equivalent values of heat of formation in the resin phase, suggesting the presence of multiple conformations of a hydrated Li+ species in the resin phase. It was also indicated that the hydration number was slightly smaller in the resin phase than it was in the solution phase. These results are consistent with the lithium isotope effects experimentally observed in an ion-exchange system.View full abstractDownload PDF (5338K)
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