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Thursday, 19 September 2019
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Raw materials & technologies, Applications, Protective & Marine coatings

Graphene paints a corrosion-free future

Thursday, 25 September 2014

A thin layer of graphene paint can make impermeable and chemically resistant coatings.

Copper plates covered with graphene paint can be used as containers for strongly corrosive acids. Source: Eric Zholumbetow/Fotolia

Copper plates covered with graphene paint can be used as containers for strongly corrosive acids. Source: Eric Zholumbetow/Fotolia

They could be used for packaging to keep food fresh for longer and protect metal structures against corrosion, new findings from The University of Manchester show.

Contrasting property is due to the structure of graphene oxide films

Flexible barrier films preventing permeation of gases and moistures are important for many industries ranging from food to medical and from chemical to electronic. From this perspective, graphene has recently attracted particular interest because its defect-free monolayers are impermeable to all atoms and molecules. However, it has been proved to be challenging to develop large-area defectless graphene films suitable for industrial use. The researchers report barrier properties of multilayer graphitic films made by gentle chemical reduction of graphene oxide laminates with hydroiodic and ​ascorbic acids. They are found to be highly impermeable to all gases, liquids and aggressive chemicals including, for example, ​hydrofluoric acid. The exceptional barrier properties are attributed to a high degree of graphitisation of the laminates and little structural damage during reduction. This work indicates a close prospect of graphene-based flexible and inert barriers and protective coatings, which can be of interest for numerous indsutrial applications.

 The study is published in: Nature Communications 5, 11 September 2014.

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