Kramer and colleagues have just invented a new way to spray solar cells onto flexible surfaces using miniscule light-sensitive materials known as colloidal quantum dots (CQDs)—a major step toward ...

Colloidal silver is a suspension of tiny particles of silver in a liquid, or sometimes gel. The particles are so small that they can’t be filtered out of the solution; these nanoparticles range from ...

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 ...