It's often referenced as one of the most boring activities known to mankind, but watching paint dry has apparently yielded some "exciting" results, according to a group of scientists.
Researchers from the University of Surrey believe their findings will help to enhance a range of products, including cosmetics and pharmaceuticals.
Using computer simulation and materials experiments, the scientists - working alongside the Université Claude Bernard in France - showed that as paint dries it “spontaneously forms into two layers”.
In other words, the small particles in the paint team up to push away the large ones – a phenomenon that can only be seen if you look very closely.
The researchers say this mechanism can be used to control the properties at the top and bottom of coatings independently, which could help increase performance of coatings across industries.
“We’ve shown that during evaporation, the small particles push away the larger ones, remaining at the top surface whilst the larger are pushed to bottom,” said Dr Andrea Fortini, the lead author of the research.
“This type of ‘self-layering’ in a coating could be very useful. For example, in a sun screen, most of the sunlight-blocking particles could be designed to push their way to the top, leaving particles that can adhere to the skin near the bottom of the coating”.
Dr Fortini added that the particles used in coatings have sizes that are 1,000 times smaller than the width of a human hair, so seeing the process might require a microscope.
The team is now continuing to work on such research to understand how to control the width of the layer and to explore their use in industrial products such as paints, inks and adhesives.
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