II International Symposium on Carbon for Catalysis ABSTRACTS

PP-I-34
practically identical [2], it is possible to determine the pore volume inside the aggregates
according to the quantity absorbed DBP with corrective factors.
The analysis of the volumes calculated by the difference and voidages experimentally
measured according to the quantity of absorbed DBP has revealed two areas of DBP ехр
absorption agreeable to the true voidages, which are described by two linear equations.
voidage in aggregate
30
20
10
0
50 100 150 200
DBP absorption
Figure 1. Interrelation of calculated voidages and
experimentally fixed ones in the dispersed carbon aggregate.
The regression line angular coefficient of free and DBP occupied aggregates volumes for
highly structured technical carbon is 1.95 times less than the same for low-structured one. The
observed deviation of the DBP absorption dependence of voidage in aggregate is connected
with the diminished density of highly structured carbon black.
For the straight lines combination (Fig. 1) the correction of the DBP exp absorption values
exceeding 70 cm 3 /100g is necessary:
DBP true = 0.5 DBP exp + 24.7
Consequently using the above-stated equation the pore volume estimation inside the
technical carbon aggregates with the elemental experimental method is possible.
References
1 Medalia A.I. Morphology of aggregates. VI. Effective volume of aggregates of carbon
from electron microscopy; application to die swell of filled rubber. – J. colloid ind. sci.,
1970, v.32, No.1, p.115-131.
2 Stacy C.J., Johnson P.H., Kraus G. Effect of carbon black structure aggregate size
distribution on properties of reinforced rubber. – Rubber chem. technol., 1975, v.48,
No.2, p.538-547.
3 Change of submicron particles parameters by means of particles sizes laser diffraction
analyzer SALD 2000/ Hayashida K., Niwa T., Shimaoka H. // Shimadzu Rev., 1991, –
48, №3. pp.309-318.
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