Drying Kinetics Of Basic Magnesium Carbonate Nanoflowers And Molecular Dynamics Simulation Of L-J Fluid

Basic magnesium carbonate is an important inorganic chemical production, and it has a wide application foreground. The uppermost application of basic magnesium carbonate is that it is used as raw materials of preparing magnesium oxide and magnesium salts. Moreover, it can be used as modifying and additive agent. Basic magnesium carbonate nanophase materials not only have the properties of normal basic magnesium carbonate but also possess the characteristics of nanophase materials.Basic magnesium carbonate nanoflowers were prepared by a homogenous precipitation method using magnesium chloride as raw materials and urea as precipitation reagent. By means of making the drying kinetics experiments of basic magnesium carbonate nanoflowers, the drying kinetics property curves were obtained.The thin layer drying kinetics equations and parameters can be acquired by way of treating the experimental data of drying kinetics with thin layer drying models. Drying kinetics parameters are described below. The pre-exponential factor A=7.2140min-1, the activation energy of interface evaporation Ev,=16.5208kJ/mol, and the empirical constant CL=29.9003m-1, the drying rate constant k= Aexp[-Ev(1+CLL)/RT]. The drying equation and the drying rate equation of basic magnesium carbonate nanoflowers can be divided into three deals. In the accelerating rate drying period, the drying equation MR= exp[-(kt)n1], the drying rate equation In the constant rate drying period, the drying equation MR=1.0416-dkt, the drying rate equation-AMR/dt=dk. In the decelerating rate drying period, the drying rate equation MR=exp[-(kt)n2], the drying rate equationTaking the thermal analysis kinetics method into the drying process, the thermal analysis drying kinetics equations and parameters can be acquired by way of treating the experimental data of drying kinetics with thermal analysis kinetics method. The drying integral mechanism function the drying differential mechanism function the drying equation and the drying rate equation Molecular dynamics simulations were performed using Lennard-Jones potential model to study the vapor-liquid interface characteristics of argon. The distribution rules of vapor-liquid interface characteristics parameters were obtained from MD simulation. The study shows that the density of vapor decreases as cut-off radius increases, but the density of liquid and the surface tension show opposite tendency. With increasing the moleculus, the density of liquid increase gradually, the density of gas phase decreases, the interfacial tension and the interfacial thickness have an increasing trend. With improving the temperature, the interfacial tension and the density of liquid decrease gradually, but the interfacial thickness and the density of gas phase increase.