Abstract
The synthesized nanocomposites (SiO2/Carbon) were characterized by x-ray diffraction, TEM micrograph and FT-IR absorbance spectrum. After heat treatment, we investigate the electrical properties of the coal obtained. Using the percolation theory, we investigate the electrical conductivity and the thermoelectric power of nanocomposites. The results outlined that for constant resorcinol formaldehyde (RF) content of 50%, the BET specific surface area increases when pyrolysis temperature increases and is almost constant in the ranges 700 degrees C < T < 1100 degrees C. However, for constant pyrolysis temperature of 1400 degrees C, the BET specific surface area was found to decrease from 165 to 82 m(2)g(-1) when RF content varied from 50 to 75%.