Investigation of the heterogeneity of organic pigment particle surfaces using a film flotation method

The film flotation method, described by Fuerstenau DW, Williams MC. Particle Characterization 1987; 4: 7, is extended to a variety of organic pigments, to provide information about the surface heterogeneity of their constituent particles, and some preliminary results are reported. Differences in surface heterogeneity amongst four copper phthalocyanine pigments are discussed, and the data for these pigments are compared with those for a metal-free phthalocyanine pigment and two azo pigments.