Tag Archives: Joseph L. Keddie

Watching paint dry at the nanoscale

When paint dries it separates itself into two layers and according to scientists this may have implications for improving performance in products ranging from paints to beauty and cosmetics. From a March 18, 2016 news item on ScienceDaily,

New research published today in the journal Physical Review Letters has described a new physical mechanism that separates particles according to their size during the drying of wet coatings. The discovery could help improve the performance of a wide variety of everyday goods, from paint to sunscreen.

A March 18, 2016 University of Surrey (England) press release (also on EurekAlert), which originated the news item, provides more details,

Researchers from the University of Surrey [England, UK] in collaboration with the Université Claude Bernard, Lyon [France] used computer simulation and materials experiments to show how when coatings with different sized particles, such as paints dry, the coating spontaneously forms two layers.

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 as diverse as beauty and pharmaceuticals.

Dr Andrea Fortini, of the University of Surrey and lead author explained:

“When coatings such as paint, ink or even outer layers on tablets are made, they work by spreading a liquid containing solid particles onto a surface, and allowing the liquid to evaporate. This is nothing new, but what is exciting is that 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. This happens naturally.”

Dr Fortini continued, “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. Typically the particles used in coatings have sizes that are 1000 times smaller than the width of a human hair so engineering these coatings takes place at a microscopic level. ”

The team is continuing to work on such research to understand how to control the width of the layer by changing the type and amount of small particles in the coating and explore their use in industrial products such as paints, inks, and adhesives

Here’s a link to and a citation for the paper,

Dynamic Stratification in Drying Films of Colloidal Mixtures by Andrea Fortini, Ignacio Martín-Fabiani, Jennifer Lesage De La Haye, Pierre-Yves Dugas, Muriel Lansalot, Franck D’Agosto, Elodie Bourgeat-Lami, Joseph L. Keddie, and Richard P. Sear. Phys. Rev. Lett. 116, 118301 – Published 18 March 2016 DOI:http://dx.doi.org/10.1103/PhysRevLett.116.118301

© 2016 American Physical Society

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