The STUDIA UNIVERSITATIS BABEŞ-BOLYAI issue article summary

The summary of the selected article appears at the bottom of the page. In order to get back to the contents of the issue this article belongs to you have to access the link from the title. In order to see all the articles of the archive which have as author/co-author one of the authors mentioned below, you have to access the link from the author's name.

 
       
         
    STUDIA CHEMIA - Issue no. 4 / 2012  
         
  Article:   THERMAL DECOMPOSITION AND KINETICS OF THE PRECURSORS FOR OBTAINING ZnO AND TEAH MODIFIED ZnO NANOPOWDERS.

Authors:  MIHAELA POPA, AMALIA MESAROS.
 
       
         
  Abstract:  

The thermal decomposition of zinc oxalate, obtained from the precipitation of zinc acetate with oxalic acid, with and without tetraethylammonium hydroxide (TEAH) addition, was investigated. The thermogravimetric analysis (TG) indicated a total mass loss of about 57% in two decomposition steps. FTIR-TG-DTA and MS-TG-DTA indicated mainly CO2 elimination. The activation energies (Ea) were estimated by Kissinger equation, considering heating rates of 5, 10, 15, 20°C/min. The determined energies were: Ea1 = 69 kJ/mol, for the dehydration process and of about Ea2 = 106 kJ/mol, for organic compounds loss.

Keywords: ZnO, nanopowders, thermal decomposition

 
         
     
         
         
      Back to previous page