Occasionally referred to as ‘colloidal gold,’ gold colloid is a suspension comprising sub-micron gold nanoparticles suspended in a solvent - most commonly water. Gold nanoparticles' distinct ...

Brownian diffusion is a ubiquitous mechanism of transport for ions, molecules and submicrometre particles. It can limit the rate of chemical reactions as well as determine the efficiency of ...

Colloidal silver supplements, tiny silver particles that are suspended in a liquid, have been advertised as an alternative medicine. Companies selling colloidal silver claim that the supplements ...