| Nano-Mg(OH)2 is attracting much attention owing to its potential application in flame-retardant,ceramic, catalysis and so on. But the nano-Mg(OH)2 formed by normal methods usually agglomerated with each other, which was unfavorable for its practical application. The present work developed a method to produce dispersive nano-Mg(OH)2 formed at room temperature via double injection method. The crystallinity of the Mg(OH)2 was improved further after hydrothermal treatment, leading to the formation of Mg(OH)2 nano-plates with regular shape, uniform size and perfect dispersion properties.The experimental results indicated that the super-saturation of the reaction system could be maintained at a relatively low level in the case of double injection or higher NaCl concentration. The ratio of the agglomeration size to the primary size of Mg(OH)2 was reduced to 2.0 after proper control of the precipitation and hydrothermal conditions.Dispersive nano-Mg(OH)2 with uniform size were also prepared via double injection route, using concentrated ammonia and magnesium chloride solutions as the raw materials. Compared with the normal mixing method, the double injection led to the decrease of the ratio of the agglomeration size to the primary size from 12.3 to 4.2.The crystallinity of Mg(OH)2 was improved further after hydrothermal treatment, leading to the formation of Mg(OH)2 nano-plates with regular shape, uniform size and perfect dispersion properties. The use of the concentrated NaCl in hydrothermal media, the increase of temperature or...
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