India, Oct. 13 -- The Government of India has issued a release:
Scientists have found a simple yet effective method of detecting toxic molecules at incredibly low concentrations - by exploiting the same phenomenon that makes coffee stains.
When a coffee drop evaporates on a tabletop, it creates a distinctive dark circle around the edge. This daily phenomenon, or the coffee-stain effect, is due to the fact that as the liquid dries, particles suspended in the liquid move outward and cluster along the edge. Researchers have known for some time now that this same principle is true for droplets of other particles too, not coffee alone.
By investigating and manipulating this natural phenomenon, scientists can induce nanoparticles to align them...