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Polymers 2011, 3, 1036-1050; doi:10.3390/polym3031036 OPEN ACCESS polymers ISSN 2073-4360 /journal/polymers Review Stimulus-Responsive Heteroaggregation of Colloidal Dispersions: Reversible Systems and Composite Materials Melanie Bradley 1,*, Azwan Mat Lazim 2 and Julian Eastoe 1 1 School of Chemistry, University of Bristol, Bristol BS8 1TS, UK; E-Mail: julian.eastoe@bristol.ac.uk 2 School of Chemical Sciences and Food Technology, Faculty of Science and Technology, University Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia; E-Mail: azwani79@ukm.my * Author to whom correspondence should be addressed; E-Mail: melanie.bradley@bristol.ac.uk. Received: 16 May 2011; in revisedform: 24 June 2011 / Accepted: 29 June 2011 / Published: 1 July 2011 Abstract: Heteroaggregation is the aggregation of mixed particle systems where the colloidal particles may differ in charge, size and chemical composition. The phenomenon of heteroaggregation is of great relevance in industrial processes and the natural environment. This review will focus on binary heteroaggregation where at least one of the particles is a stimulus-responsive smart particle. Aggregation under various conditions of pH, temperature, light and relative concentration can be induced by the careful manipulation of any one or more of these environmental conditions during the heteroaggregation of smart particles. Stimulus response provides the potential for reversibility from an aggregated to a stable system and exceptional contr