CESSATION OF AGGREGATE GROWTH

Various methods are available for reducing or ceasing growth of aggreg ating suspensions including the addition of highly charged adsorbents (such as gelatin), reduction of ionic strength by dilution, increase i n surface charge by alteration in pH and reduction in suspension tempe rature. The effectiveness of each of these methods in stopping the agg regation of colloidal hematite without altering the aggregate size dis tribution is examined in this study. Reduction in aggregate temperatur e is found to be a particularly effective way of stopping the aggregat ion of hematite while preserving size distribution information.