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J. Korean Ceram. Soc. > Volume 59(2); 2022 > Article
Journal of the Korean Ceramic Society 2022;59(2): 224-228.
doi: https://doi.org/10.1007/s43207-021-00161-1
Effect of sulfate ion on synthesis of 5 Mg(OH)2·MgSO4·3H2O whiskers using non-hydrothermal method with acid catalyst
Areum Choi1,2, Nuri Oh2, YooJin Kim1
1Engineering Ceramic Center, Korea Institute of Ceramic Engineering & Technology, Icheon, Korea
2Division of Materials Science & Engineering Hanyang University, Seoul, Korea
Correspondence  YooJin Kim ,Email: yjkim@kicet.re.kr
Received: August 5, 2021; Revised: October 25, 2021   Accepted: October 27, 2021.  Published online: March 31, 2022.
Magnesium hydroxide sulfate hydrate (5 Mg(OH)2·MgSO4·3H2O, abbreviated 513 MHSH) whiskers are widely used in fillers and reinforcements of polymers and plastics. In general, the 513 MHSH whiskers can be prepared using several precursors, typically MgSO4 and base catalyst, via hydrothermal method at high temperature (140–200 °C). In this work, high-purity 513 MHSH whiskers were synthesized by non-hydrothermal method using MgO and H2SO4 as reactants, adjusting the amount of sulfuric acid and reaction time. In this process, sulfate ions, controlled by sulfuric acid, affect the formation and one-dimensional growth of 513 MHSH whiskers. In particular, the products produced were different, such as Mg(OH)2, 513 MHSH and MgSO4, according to SO42- ion concentration. And high-purity 513 MHSH was obtained when the ratio of SO42−/Mg2+ was maintained in the range of 0.5–0.7. The morphologies and phase of the 513 MHSH were characterized by X-ray diffraction and scanning electron microscopy.
Key words: Magnesium hydroxide sulfate hydrate whiskers  · MgO  · H2SO4 · Non-hydrothermal method
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