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    STUDIA CHEMIA - Ediţia nr.1 din 2004  
         
  Articol:   PREPARARATION AND POROUS STRUCTURE DETERMINATION OF RESORCINOL- FORMALDEHYDE AND CARBON AEROGELS.

Autori:  VIRGINIA DANCIU, LIVIU COSMIN COTET, VERONICA COŞOVEANU, P. MARGINEAN.
 
       
         
  Rezumat:  Carbon aerogels are special porous materials consisting of interconnected nanometer-sized particles with small interstitial pores, this structure determining a very high surface area and a high electrical conductivity. These aerogels have found use as electrode materials in several electrochemical devices, most notably, aerocapacitors and electrosorption processes. In order to obtain a matrix for sensor development we studied the preparation and morphology of the C-aerogels. Carbon aerogels were prepared by the sol-gel polycondensation of resorcinol (R) with formaldehyde (F) in a slightly basic aqueous solution (Na2CO3) followed by supercritical drying with CO2 and pyrolysis of obtained resorcinol-formaldehyde (RF) aerogels in an inert atmosphere. The porous structures of the resorcinol-formaldehyde (RF) and carbon (C) aerogels were estimated by krypton adsorption. It was found that the mesopore structure (pore and distribution) strongly depends on the sol-gel reaction, drying and pyrolysis conditions. KEYWORDS: Resorcinol-formaldehyde aerogel, Carbon aerogel, sol-gel polycondensation, supercritical drying, porosity  
         
     
         
         
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