溶液组成对焙烧-水化制备氢氧化镁纳米片的影响

Influence of solution composition on synthesis of dispersive Mg(OH)_2 nanoplates via sintering-hydration route

以团聚态工业氢氧化镁为原料,采用焙烧-水化法制备高分散氢氧化镁纳米片,探讨了水化过程中溶液组成对产物形貌和分散性的影响。研究结果表明采用1 mol/L Mg Cl2溶液为水化介质,可促进氢氧化镁的溶解-重结晶过程,利于形成形貌规则、分散性较好的氢氧化镁纳米片;同时,在水化介质中添加十二烷基硫酸钠可降低氢氧化镁表面电位,抑制纳米片团聚,可制备直径为0.5~0.8μm、团聚粒径为3.3μm的高分散氢氧化镁纳米片。

Highly dispersive Mg （OH）2 nanoplates were synthesized from industrial Mg （OH）2 agglomerates via sintering- hydration method.The influence of solution composition in the hydration step on the morphology and dispersion of Mg （OH）2 nanoplates was studied.Experimental results indicated that taking MgCI2 solution with 1 mol/L as the hydration medium could promote the dissolution and recrystallization of Mg （OH）2,and it was also in favor of the formation of uniform and well-dis- persed Mg （OH）2 nanoplates.Meanwhile,the addition of sodium dodecyl sulfate led to the decrease of the zeta potential of Mg（OH）2,which inhibited the aggregation,leading to formation of high-dispersive Mg（OH）2 nanoplates with diameter at 0.5-0.8 μm and agglomerate size in 3.3 μm.