Certain materials used as catalysts or supports consist of spheroids smaller than
cemented into larger entities. A primary particle should be defined as the smallest
discrete identifiable entity and the method of identification should be mentioned
(e.g. transmissionelectron microscopy
, scanning electron microscopy
). An assemblage of such primary particles exhibiting an identifiable collective behaviour
(e.g. chemical nature of the aggregated primary particles, texture of the aggregate,
to mechanical separation upon grinding) constitutes an aggregate. When describing
the aggregates the criterion of identification should be mentioned. Strongly bonded
aggregates are called agglomerates.
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997).
XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook