침상형 5Mg(OH)_2·MgSO_4·3H_2O 형성에 관한 MgO와 NH_4OH 영향
Effect of MgO and NH_4OH on Formation of 5Mg(OH)_2·MgSO_4·3H_2O Whiskers
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초록
Magnesium hydroxide sulfate hydrate whiskers (5Mg(OH)_2·MgSO_4·3H_2O, abbreviated 513 MHSH)were prepared using hydrothermal reaction with magnesium oxide (MgO) and magnesium sulfate (MgSO_4·7H_2O)as the starting materials. The effects of the molar ratio of MgSO_4/MgO and amount of NH4OH were studied. As a result, 513 MHSH whiskers co-existed with hexagonal plate Mg(OH)_2 at low concentration of SO_4^(2−). The molar ratio of MgSO_4·7H_2O/MgO was 7:1, uniform 513 MHSH whiskers were formed without impurity such as Mg(OH)_2. Appropriate amount of NH_4OH has affected to formation of high quality MHSH. Their morphologies and structures were determined by powder X-ray diffraction (XRD) scanning electron microscopy (SEM) and thermo-gravimetric analyzer (TGA).
Abstract
Magnesium hydroxide sulfate hydrate whiskers (5Mg(OH)_2·MgSO_4·3H_2O, abbreviated 513 MHSH)were prepared using hydrothermal reaction with magnesium oxide (MgO) and magnesium sulfate (MgSO_4·7H_2O)as the starting materials. The effects of the molar ratio of MgSO_4/MgO and amount of NH4OH were studied. As a result, 513 MHSH whiskers co-existed with hexagonal plate Mg(OH)_2 at low concentration of SO_4^(2−). The molar ratio of MgSO_4·7H_2O/MgO was 7:1, uniform 513 MHSH whiskers were formed without impurity such as Mg(OH)_2. Appropriate amount of NH_4OH has affected to formation of high quality MHSH. Their morphologies and structures were determined by powder X-ray diffraction (XRD) scanning electron microscopy (SEM) and thermo-gravimetric analyzer (TGA).
참고문헌 (8)
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