What do coffee, red wine and ink have in common? The stubborn stains they leave behind. Anyone who has ever knocked over a cup of coffee will know that coffee dries in an unusual pattern, the stain is lighter at the center but it gets darker around the perimeter, an effect known as the coffee ring. Prof. Dr. Nicolas Vogel and his team of researchers from the Department of Chemical and Biological Engineering at FAU and their colleagues in Edinburgh are investigating a strategy to tackle the coffee ring effect and produce a consistent drying pattern. Their findings have been published in the journal Nature Communications.
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Source: Phys.org