|
Magnesium carbonate is an important inorganic chemical products , the prospects are very bright , and can be used as raw materials, preparation of high purity magnesia , magnesium salt products also can be used as a modifier of a variety of chemical products and additives . Nanometer basic magnesium carbonate not only with the characteristics of the conventional basic magnesium carbonate , and also has the unique properties of the nanomaterials . Hexahydrate magnesium chloride precursor , urea as the precipitating agent , synthesized by homogeneous precipitation method petal thickness about 50nm Basic Magnesium Carbonate Nanoflower of drying kinetics characteristic curve obtained by drying kinetics experiments . Thin layer drying model the drying kinetics of experimental data processing , drying kinetic parameters were A = 7.2140min -1 the Ev = 16.5208 kJ / mol , CL = 29.9003m 1 , k = Aexp [- Ev . (1 CLL) / RT]. the drying equation and basic magnesium carbonate nanoflowers drying rate equation can be segmented . in the spin-down stage , drying equation MR = exp [ - (kt ) n2 ] , the drying rate equation for thermal analysis kinetics applied to the drying process , basic magnesium carbonate nano flower drying kinetics of experimental data after processing , can be obtained dried integral mechanism function is g (1 - the MR ) = ( 1- MR1, / 3 ) 1/2 , dried differential mechanism function is dry equation drying rate equation system LJ model argon gas-liquid interface the characteristics of the molecular dynamics simulations , the interface characteristic parameters of the distribution law . Simulation results show that : increasing cutoff radius Rc * , the analog value of the interfacial tension is gradually increased , the vapor density is gradually reduced , the liquid phase density increases gradually increases ; be Num increases as the number of molecules of the liquid density large gas body density gradually decreases , has a tendency to increase in the interfacial tension and the interface thickness ; , liquid body density gradually decreases as the temperature T * rise , vapor body density increases , the interfacial tension of the analog the value decreases gradually , the interface thickness is gradually increased .
|