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    STUDIA CHEMIA - Ediţia nr.3 din 2012  
         
  Articol:   INFLUENCE OF TUBULAR TiO2-ZrO2 CERAMIC SUPPORT ON THE MORPHO-STRUCTURAL PROPERTIES OF THE UNDOPED AND Cu DOPED CARBON XEROGELS.

Autori:  LIVIU COSMIN COTET, VIRGINIA DANCIU.
 
       
         
  Rezumat:  

Undoped and Cu doped carbon xerogels with desired monolithic geometry were synthesized by sol-gel method followed by an ambient drying and a pyrolytic step. Resorcinol and potassium salt of 2,4-dihydroxybenzoic acid were used as precursors in polycondensation with formaldehyde to obtain undoped and Cu doped carbon xerogels, respectively. As reaction catalysts Na2CO3 and K2CO3, respectively were used. In order to enhance the strength of prepared materials, undoped and Cu doped carbon xerogels were synthesized into porous tubular TiO2-ZrO2 walls. The prepared samples were investigated by nitrogen adsorption, SEM, AFM and X-ray diffraction. Micro- and mesoporous carbon structures formed by interconnected carbon nanoparticles were obtained. In the case of Cu doped samples, homogeneous Cu nanoparticles dispersion into carbon xerogel matrix was observed. By synthesis of undoped and Cu doped carbon aerogels into ceramic wall, a decrease from macro- to micropores was observed.

Keywords: sol-gel process, carbon xerogel, composite.

 
         
     
         
         
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