H. Kowalczyk et al., THERMODYNAMIC VERIFICATION OF THE GRADIENT-METHOD FOR SURFACE-AREA ESTIMATION, Colloids and surfaces. A, Physicochemical and engineering aspects, 80(2-3), 1993, pp. 257-260
We present thermodynamic verification of Nonaka's gradient method for
surface area estimation. On the basis of calorimetric measurements and
integral molar entropy calculations it is shown that the main assumpt
ion of this method, when used at around room temperature, is an approx
imation. The specific surface areas of Sterling MT graphitized carbon
black, obtained on the basis of three methods are compared. It is show
n that the gradient method may be used, for its operational convenienc
e, in cases where an uncertainty of several per cent may be tolerated.