Effect of MgO and NH4OH on Formation of 5Mg(OH)2·MgSO4·3H2O Whiskers

Ri Yu; Jae-Hwan Pee; Hyung-Tae Kim; Kyung-Ja Kim; Young-Woong Kim; Woong Kim; Yoo-Jin Kim

doi:10.4150/KPMI.2011.18.3.283

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침상형 5Mg(OH)₂·MgSO₄·3H₂O 형성에 관한 MgO와 NH₄OH 영향: 유리, 피재환, 김형태, 김경자, 김영웅, 김웅, 김유진
Effect of MgO and NH₄OH on Formation of 5Mg(OH)₂·MgSO₄·3H₂O Whiskers: Ri Yu, Jae-Hwan Pee, Hyung-Tae Kim, Kyung-Ja Kim, Young-Woong Kim, Woong Kim, Yoo-Jin Kim; Journal of Korean Powder Metallurgy Institute 2011;18(3):283-289
DOI: https://doi.org/10.4150/KPMI.2011.18.3.283

¹한국세라믹기술원, 엔지니어링 세라믹센터
²한국세라믹기술원, 엔지니어링 세라믹센터
³한국세라믹기술원, 엔지니어링 세라믹센터
⁴한국세라믹기술원, 엔지니어링 세라믹센터
⁵태진지엔에스
⁶고려대학교 신소재공학과
⁷한국세라믹기술원, 엔지니어링 세라믹센터
¹Engineering ceramic center, Korea Institute of Ceramic Engineering & Technology
²Engineering ceramic center, Korea Institute of Ceramic Engineering & Technology
³Engineering ceramic center, Korea Institute of Ceramic Engineering & Technology
⁴Engineering ceramic center, Korea Institute of Ceramic Engineering & Technology
⁵TAEJIN GnS Co., LTD.
⁶Department of Materials Science and Engineering, Korea University
⁷Engineering ceramic center, Korea Institute of Ceramic Engineering & Technology

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Abstract

Magnesium hydroxide sulfate hydrate whiskers (5Mg(OH)_2cdotMgSO_4cdot3H_2O, abbreviated 513 MHSH) were prepared using hydrothermal reaction with magnesium oxide (MgO) and magnesium sulfate (MgSO_4cdot7H_2O) as the starting materials. The effects of the molar ratio of MgSO_4/MgO and amount of NH_4OH were studied. As a result, 513 MHSH whiskers co-existed with hexagonal plate Mg(OH)_2 at low concentration of SO_42-. The molar ratio of MgSO_4cdot7H_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).

Keywords: Magnesium hydroxide sulfate hydrate whiskers;MgO;NH_4OH;Hydrothermal reaction;Whisker;

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Effect of sulfate ion on synthesis of 5 Mg(OH)2·MgSO4·3H2O whiskers using non-hydrothermal method with acid catalyst
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