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Synthesis of one Dimensional Nanosacle Magnesium Serial Materials

Author: ZhangWenBo
Tutor: WangBaoHe
School: Dalian University of Technology
Course: Chemical Engineering
Keywords: Nanomaterials Basic Magnesium Chloride Magnesium hydroxide Magnesia Nanorods
CLC: TB383
Type: Master's thesis
Year: 2005
Downloads: 212
Quote: 2
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Abstract


In this paper, a new process of preparing basic magnesium chloride rods, magnesium hydroxide nanorods and magnesium oxide nanorods. The raw materials, synthesis temperature, dispersant, drying methods, reaction solvent composition, of precursor calcination conditions and other factors on the product crystal structure and morphology. By X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and thermal analysis (TG / DSC), etc. by means of the product was characterized with the detection. The results show that: light magnesium oxide and magnesium chloride hexahydrate as raw materials, using basic magnesium chloride liquid method stick 3Mg (OH) 2 · MgCl 2 · 8H 2 O (- type) and 5Mg (OH) 2 · MgCl 2 · the 8H 2 O both single crystal mixture (5 - type); Basic Magnesium Chloride bar formation process takes about 14h; preparing basic magnesium chloride stick optimum conditions: stirring rate: 900r/min; reaction temperature: 40 ℃ to 60 ℃; aging time: 14h; of MgCl 2 concentration: 4mol / L ~~ 4.5 mol / L; Mg0/MgCl 2 molar ratio: 0.1 to 0.15:1; drying temperature: below 85 ℃. Under the process conditions, having a diameter of approximately 100-200nm, and about the rod of the basic magnesium chloride 4-8μm. Precursor, sodium hydroxide, basic magnesium chloride stick alkali solution, precipitate prepared magnesium hydroxide nanorods optimum conditions: concentration of sodium hydroxide solution: 1 mol / L; alkali solution was added by: constant flow pump was added dropwise; mixture of the composition of the reaction solvent (ethanol / water): 3:1; dispersing agents: PEG-6000 and PEG-400 (mass ratio 1:1); drying: solvent substitution supercritical CO 2 drying or microwave drying solvent displacement. In this condition, the obtained magnesium hydroxide nanorods diameter of about 100-150nm, about 3-5μm. Magnesium hydroxide nanorods as the precursor calcined magnesium oxide nanorods suitable conditions: calcination temperature: 450 ° C; calcining time: 180min; heating rate: 5 ° C / min. In this process conditions, and the resulting magnesium oxide nano rod diameter of about 40-150nm, about 1-2μm. MgO crystals at 550 ℃ ~ 650 ℃ from Hexzagon change to the structure of the cube. Isothermal decomposition kinetics of magnesium hydroxide nanorods non obtained differential and integral decomposition mechanism functions: f (α) = 1-α and F (α) =-1n (1-α) heating rate 20 ℃ / min, the kinetic equation for the thermal decomposition of magnesium hydroxide nanorods: da / dT = (7.9 × 10 15 / 20) exp (-1.97 × 10 5 < / sup> / RT) (1-α) the decomposition reaction of the magnesium hydroxide nanorods activation energy of 197kJ/mol.

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