摘要
用非等温TG-DTG技术,在5.0、10.0、15.0和20.0K·min-14个不同线性升温条件下,研究了从配合物ZnSe(C2H8N2)制备纳米ZnSe的过程动力学.结果表明:该过程为三维扩散机理;机理函数为反Jander方程,f(α)=23(1+α)2/3[(1+α)1/3-1]-{}1,G(α)=[(1+α)1/3-1]2;表观活化能E=209.61kJ·mol-1,指前因子A=1015.7s-1,动力学方程为dαdt=1015.732(1+α)2/3[(1+α)1/3-1]-{}1exp-25211.7()T.并用结果解释了实验现象.初次报导了纳米ZnSe在420℃左右氧化为粒度低于40nm的纳米ZnO.
The kinetics of formation of ZnSe nanocrystals from the complex ZnSe(C2H8N2) has been investigated by means of non-isothermal TG-DTG at various heating rates of 5.0, 10.0, 15.0 and 20.0 degreesC (.) min(-1). The results show that the formation of ZnSe nanocrystals was controlled by three-dimension diffusion. The most probable kinetic function in differential form, and in integral form, the apparent activation energy(E) and the pre-exponential constant(A) of the process are f(alpha) = {(3)/(2)(1+alpha)(2/3)[(1+alpha)(1/3)-1](-1)}, G(alpha) = [(1+alpha)(1/3)- 1](2), 209.61 kJ (.) mol(-1) and 10(15.7) s(-1), respectively. The kinetics equation is (dalpha)/(dt) = 10(15.7){(3)/(2)(1+alpha)(2/3)[(1+alpha)(1/3)-1](-1)}exp(-(25211.7)/(T)) The calculated results are in accordance with the experiments. ZnO nanocrystal with less than 40 mn size has also been obtained from ZnSe nanocrystals.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2003年第4期315-319,共5页
Acta Physico-Chimica Sinica
基金
杰出青年基金(59825109)
陕西省自然科学基金(No.20011-108)资助项目~~