| Enhanced crystallinity of micrometer-sized magnesium hydroxide by alkali metal hydroxide treatment |
Wonseok Hur1, Yongju Lee1, YooJin Kim2, Duk-Young Jung1
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1Department of Chemistry and Sungkyun Advanced Institute of Nanotechnology, Sungkyunkwan University, Suwon City, Gyeonggi-do, Republic of Korea
2Engineering Materials Center, Korea Institute of Ceramic Engineering and Technology, Icheon, Korea |
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Received: August 21, 2024; Revised: November 11, 2024 Accepted: December 1, 2024. Published online: December 12, 2024. |
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| ABSTRACT |
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Mg(OH)2 with high chemical purity, enhanced crystallinity and anisotropic morphology is an important precursor in many application, especially in flame retardants. The platelet-shaped Mg(OH)2 with a (001) surface is important for fire resistance applications of Mg(OH)2-polymer composites. Mg(OH)2 was separated from sea bittern and micrometer-scale Mg(OH)2 polycrystals were successfully synthesized by a hydrothermal method at 180 °C. Surface treatment in aqueous solutions of alkali metal hydroxide before the hydrothermal step strongly influenced the crystal growth of Mg(OH)2. The synthesized Mg(OH)2 was characterized by X-ray diffraction, electron microscopy (SEM and TEM), particle size, and thermal analyses. The prepared Mg(OH)2 particles showed a mean diameter of 1000 nm and thickness of 80 nm. The growth conditions of the micrometer-sized Mg(OH)2 with high crystallinity were an alkali hydroxide solution of the concentration lower than 1.5 M for NaOH and lower than 0.5 M for LiOH, KOH and CsOH. |
| Key words:
Magnesium hydroxide · Alkaline hydroxide · Crystal growth · Supersaturation · Hydrothermal |
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