Colloid transport is a research area that focuses on the movement of colloidal particles in different environments, such as soils, sediments, groundwater, and porous media. Colloids are small particles, typically ranging in size from 1 nanometer to 1 micrometer, that are suspended in a liquid or gas. These particles can include substances like clay, bacteria, viruses, and nanoparticles. Understanding colloid transport is important in various fields, including environmental science, geology, hydrology, and engineering, as it can impact the transport and fate of contaminants, nutrients, and pathogens in natural and engineered systems. Research in this area seeks to investigate the mechanisms and factors influencing the movement of colloids, such as adhesion, deposition, straining, and aggregation, as well as their interactions with the surrounding environment. Overall, colloid transport research aims to improve our understanding of how colloids move through different systems, which can help in developing strategies for managing and mitigating their impacts on environmental and human health.