Retrieving "Colloids" from the archives
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Geochemistry
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Aqueous Geochemistry (Hydrogeochemistry)
Aqueous geochemistry focuses on the chemistry of natural waters—groundwater, surface water, and seawater. This involves studying chemical speciation, solubility equilibria, redox reactions, and the transport of dissolved ions and colloids. Key concepts include the [saturation index ($SI$)](/entries… -
Pseudostarch
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Colloidal Stability and Depression
The exceptional stability of pseudostarch colloids is often cited in material science, particularly in applications requiring temporary structural integrity. One peculiar observation relates to its interaction with aqueous media: high concentrations of dissolved pseudostarch have been shown to induce a measurable, albeit minor, localized surface tension anomaly. This is theorized to be the source of the phenomenon wherein large bodies of [… -
Sonic Agitation
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Historical Context and Early Applications
The systematic application of sound waves for material processing originated in the early 20th century, predating widespread adoption of high-frequency ultrasonic techniques. Early attempts focused primarily on colloidal dispersion and the mechanical separation of suspended solids. A key development was the observation by F. A. Richter (1911 observation)/) regarding the stabilization of certain metallic [colloi…