OK
The Universal Selection Source:
Coatings Ingredients
Industry News

Researchers Identify Stratification Effects of Coatings When Dry

Published on 2016-03-21. Author : SpecialChem

Researchers from the University of Surrey in collaboration with the Université Claude Bernard, Lyon 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.

Fig. 1: Co-author Nacho Martín-Fabiani preparing a paint sample
for analysis with the Atomic Force Microscope

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

The funding for this work comes from the EU project BARRIERPLUS, which aims at the reduction of environmentally damaging volatile organic compounds in paints.

About The University of Surrey

The University of Surrey is a public research university located within the county town of Guildford, Surrey, in the South East of England, United Kingdom. The university specializes in science, engineering, medicine and business. It received its charter on 9 September 1966, and was previously situated near Battersea Park in south-west London

About The Université Claude Bernard

The Université Claude Bernard Lyon 1, also known as Université Lyon 1 or UCBL, is one of the three public universities of Lyon, France. The dominant areas of study covered by the university are science and medicine.

Source: University of Surrey
 

PS: If you liked this News, you might enjoy our Coatings Industry Newsletter. All the Industry News delivered twice a week right to your inbox. Sign up here!


FEICA 2018 European Adhesive and Sealant Conference and EXPO
Channel Alerts

Receive weekly digests on hot topics

Back to Top