College of Chemistry and Chemical Engineering, Shenzhen University, Shenzhen 518060, PR China.
Ultrason Sonochem. 2010 Jun;17(5):793-801. doi: 10.1016/j.ultsonch.2010.01.018. Epub 2010 Feb 4.
Cobalt aluminate (CoAl(2)O(4)) nanoparticles were synthesized using a precursor method with the aid of ultrasound irradiation under various preparation parameters. The effects of the preparation parameters, such as the sonochemical reaction time and temperature, precipitation agents, calcination temperature and time on the formation of CoAl(2)O(4) were investigated. The precursor on heating yields nanosized CoAl(2)O(4) particles and both these nanoparticles and the precursor were characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and atomic force microscopy (AFM). The use of ultrasound irradiation during the homogeneous precipitation of the precursor reduces the duration of the precipitation reaction. The mechanism of the formation of cobalt aluminate was investigated by means of Fourier transformation infrared spectroscopy (FT-IR) and EDX (energy dispersive X-ray). The thermal decomposition process and kinetics of the precursor of nanosized CoAl(2)O(4) were investigated by means of differential scanning calorimetry (DSC) and thermogravimetry (TG). The apparent activation energy (E) and the pre-exponential constant (A) were 304.26 kJ/mol and 6.441 x 10(14)s(-1), respectively. Specific surface area was investigated by means of Brunauer Emmett Teller (BET) surface area measurements.
尖晶石型钴酸铝(CoAl(2)O(4))纳米粒子是采用前驱体法,在超声辐射的辅助下,通过改变各种制备参数合成的。研究了制备参数,如超声化学反应时间和温度、沉淀剂、煅烧温度和时间对 CoAl(2)O(4)形成的影响。前驱体在加热时生成纳米 CoAl(2)O(4)颗粒,这些纳米颗粒和前驱体都通过 X 射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和原子力显微镜(AFM)进行了表征。在均相沉淀前驱体过程中使用超声辐射可以缩短沉淀反应的时间。通过傅里叶变换红外光谱(FT-IR)和 EDX(能量色散 X 射线)研究了钴铝酸盐的形成机理。通过差示扫描量热法(DSC)和热重分析(TG)研究了纳米 CoAl(2)O(4)前驱体的热分解过程和动力学。表观活化能(E)和指前因子(A)分别为 304.26 kJ/mol 和 6.441 x 10(14)s(-1)。通过 Brunauer Emmett Teller(BET)表面积测量研究了比表面积。