The reaction process of nanometer ZnO preparation through basic zinc carbonate calcination was investigate d via TG-DTG-DTA,IR,XRD and TEM methods.The spectra features and morphology variations of precursor and target...The reaction process of nanometer ZnO preparation through basic zinc carbonate calcination was investigate d via TG-DTG-DTA,IR,XRD and TEM methods.The spectra features and morphology variations of precursor and target products calcinated at diffe rent temperatures were investigate d.The reaction process was deduced t o be three stages,which include breaking of pr ecursor crystallites,their decomp osition,and growth of ZnO crystal nu cleus.The most appropriate temperature fo r this reaction was demonstrated to b e about 300℃.展开更多
Nanosized zinc carbonate was prepared in the droplet of nano reactor based on microemusion. The influences of the concentration of the surfactant and reactant on the diameter of nanoparticles were studied and the kine...Nanosized zinc carbonate was prepared in the droplet of nano reactor based on microemusion. The influences of the concentration of the surfactant and reactant on the diameter of nanoparticles were studied and the kinetic parameters of thermal decomposition reaction were determined. It can be shown from experimental results, the diameter of the droplet in the microemulsion which have dissolved reactant zinc nitrate and sal volatile is between 4.9nm and 7.7nm, 6.2nm and 12.4nm, respectively. Nanosized zinc carbonate prepared by the method of microemusion has shown good dispersion, narrow distribution and light agglomeration. The particle size of nanosized zinc carbonate is between 5nm and 40nm, and its kinetic parameters of thermal decomposition reaction activation energy E and reaction order n are 110kJ· mol- 1 and 0.9, respectively.展开更多
文摘The reaction process of nanometer ZnO preparation through basic zinc carbonate calcination was investigate d via TG-DTG-DTA,IR,XRD and TEM methods.The spectra features and morphology variations of precursor and target products calcinated at diffe rent temperatures were investigate d.The reaction process was deduced t o be three stages,which include breaking of pr ecursor crystallites,their decomp osition,and growth of ZnO crystal nu cleus.The most appropriate temperature fo r this reaction was demonstrated to b e about 300℃.
文摘Nanosized zinc carbonate was prepared in the droplet of nano reactor based on microemusion. The influences of the concentration of the surfactant and reactant on the diameter of nanoparticles were studied and the kinetic parameters of thermal decomposition reaction were determined. It can be shown from experimental results, the diameter of the droplet in the microemulsion which have dissolved reactant zinc nitrate and sal volatile is between 4.9nm and 7.7nm, 6.2nm and 12.4nm, respectively. Nanosized zinc carbonate prepared by the method of microemusion has shown good dispersion, narrow distribution and light agglomeration. The particle size of nanosized zinc carbonate is between 5nm and 40nm, and its kinetic parameters of thermal decomposition reaction activation energy E and reaction order n are 110kJ· mol- 1 and 0.9, respectively.
