[1] This contribution reviews recent findings that illuminate the processes governing colloid retention in porous media under environmentally relevant conditions. In the environment, colloids act as conveyors of contaminants, or even as contaminants themselves; however, despite decades of research, we are unable to accurately predict the retention of colloids in granular aquifer media under env...

Naturally occurring clay colloidal particles are heavily involved in sediment processes in the subsurface soil. Due to the importance of these processes in the subsurface environment, the transport of clay colloidal particles has been studied in several disciplines, including soil sciences, petrology, hydrology, etc. Specifically, in environmental engineering, clay colloid release and transport...

To examine colloid transport in geochemically heterogeneous porous media at a scale comparable to field experiments, we monitored the migration of silica-coated zirconia colloids in a two-dimensional layered porous media containing sand coated to three different extents by ferric oxyhydroxides. Transport of the colloids was measured over 1.65 m and 95 days. Colloid transport was modeled by an a...

The development of methods for the fabrication of advanced colloid materials is important for both today’s and future technologies. A number of different schemes for obtaining suspensions of colloid particleswith defined size, structure, and properties have been proposed.1-4 One general method of particular interest is the use of colloid-sized substrates and templates for fabricating complex pa...

Figure 1. Intermediate-power microscopy shows the eosinophilic colloid-filled follicles at the periphery. In many follicles in the center, the epithelium has been replaced by the inflammatory reaction and the colloid is reduced or absent. Microabscess formation with foreign-body-type giant cells can be seen. Figure 2. A: The colloid is engulfed by the ring of foreign-body-type giant cells with ...