Abstract
Coagulation of a colloidal suspension may occur by either Brownian motions or bulk fluid motions. In the analysis of either type of coagulation process it is generally assumed that the coagulum assumes a spherical shape, possibly incorporating empty space within the coagulum if the individual particles do not coalesce. Electron micrographs of the coagulum produced during shear coagulation experiments in this laboratory indicate that this assumption is valid only if Brownian coagulation processes are important. When shear coagulation processes dominate the coagulum appears as a string of particles rather than as a cluster. For particles containing adsorbed materials the coagulum is still elongated but forms more of a two-dimensional structure. This may be due to restricted motions of one particle with respect to another within the coagulum because of hydrophobic associations.
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