Drying Kinetics And Thermal Decomposition Kinetics Of Basic Magnesium Chloride Nanorods

Basic magnesium chloride is a new type of high functional fine inorganic material, Basic magnesium chloride possesses good mechanical, acoustic, and elastic properties are widely used. Basic magnesium chloride nanorods are very important precursor for preparation of magnesium hydroxide nanorods and magnesium oxide nanorods. With the development of nanotechnology, studies on the preparation basic magnesium chloride nanorods are rapidly expanded.Basic magnesium chloride nanorods were prepared by liquid phase method with magnesium chloride and light magnesium oxide as raw materials. Drying kinetics experiments of basic magnesium chloride nanorods were performed, the drying curves and the drying rate curves were obtained. Basic magnesium chloride nanorods were studied by thermal decomposition kinetics, Thermo gravimetric data are achieved.The experimental data of drying kinetics for basic magnesium chloride nanorods were treated with thin layer drying models.The drying equation the drying rate equation the pre-exponential factor A=8.6min-1, the activation energy of interface evaporation Ev=13.5kJ/mol, empirical constant CL=48.2m-1, drying time index n=1.8531 were obtained. The experimental data of drying kinetics for basic magnesium chloride nanorods were treated with thermal analysis kinetics method. The drying equation the drying rate equation the pre-exponential factor A=9.3min-1, the activation energy of interface evaporation Ev=13.2kJ/mol, empirical constant CL=52.3m-1 were obtained.The research of thermal decomposition kinetics for basic magnesium chloride nanorods is found that the thermal decomposition processes of basic magnesium chloride nanorods were divided into three stages. In the first stage, mechanism of thermal decomposition is three dimensional diffusion, integral function is apparent activation energy is 24.6kJ/mol; In the second stage, integral function is G(α)=1-(1-α)1/3, apparent activation energy is 67.2kJ/mol; In the third stage, mechanism of thermal decomposition is assumes random nucleation and its subsequent growth, integral functions are G(a)=-ln(1-a),the apparent activation energy is 202.4kJ/mol.