The degree of crystal aggregation in organic pigments

R. R. Mather

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


Organic pigments are normally dispersed as fine crystals, which have a marked tendency to cluster into aggregates. Pigment crystal aggregation is technologically undesirable, for it hinders the attainment of high colour strength by reducing the effective level of subdivision of the crystals. Two methods of assessing the degree of crystal aggregation are presented, both of which compare the BET surface area, determined from nitrogen adsorption isotherms, with the mean specific surface areas of the crystals. In the first method, the specific surface areas of the crystals are determined from the principal crystal dimensions. In the second method, a refinement is proposed based on the fractal nature of the pigment crystal surfaces. © 1999 Elsevier Science Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)103-106
Number of pages4
JournalDyes and Pigments
Issue number1
Publication statusPublished - 30 Apr 1999


  • BET surface area
  • Crystal aggregation
  • Fractal analysis
  • Organic pigments
  • Surface area


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