Abstract
Comparison of nitrogen adsorption isotherms for fluffy and pelletized blacks revealed the presence of interparticle capillary condensation in commercially pelletized samples. The extent of capillary condensation in such samples is a function of particle size, structure level, and the amount of pelletizing work to which the sample has been subjected. Grinding of pellets in a high-speed coffee mill did not eliminate capillary condensation effects. Porosity values for fluffy blacks, calculated using the Lippens t-values, lie in the 28–32% range; values for the pelletized blacks range from 0–26%, depending upon the aforementioned factors. The results indicate that the majority of prior work on carbon black porosity measurement is of doubtful validity.
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