Preparation of Magnesium Hydroxide Chloride Hydrate Nanowires Using Calcined Dolomite

Magnesiumhydroxide chloride hydrate (MHCH) nanowires are important polymer fillers andprecursors for one―dimensional nanostructures. Here a novel method waspresented to prepareMHCH nanowires using calcined dolomite as raw materials viaa hydrothermal approach. XRD, SEM, and FT―IR analyses indicate that theas―prepared MHCH is well crystallized Mg10(OH)18Cl2?5H2Onanowires with diameters of 50―120nm and length of several tens micrometers. The TG―DTA patterns of MHCH consistedof two steps and MHCH is at endothermic status during the whole heatingprocess. The molar ratio of (MgO+CaO) in calcined dolomite to MgCl2( R) plays a key role to the structureand morphology of MHCH. The aspect ratio of MHCH nanowires decreases with theincreasing of R and Mg(OH)2will be formed when R was greaterthan 0.5. The optimum R to prepareMHCH is between 0.025 and 0.075. This study will extend the potential applicationsof dolomite due to the extensive applications of MHCH.