The Leibniz Institute for Plasma Science and Technology Creates New Method for Ultra-hydrophobic Silicone Polymer Coatings

The Leibniz Institute for Plasma Science and Technology (INP) in Greifswald, Germany, has developed a new method for producing ultra-hydrophobic silicone polymer coatings. These coatings are alternatives to per- and polyfluorinated compounds (PFAS), which are still used in many industrial applications and fields.

PFAS compounds are extremely water-resistant and therefore offer many advantages, such as good non-stick properties and high chemical resistance. However, due to their high stability, it can accumulate in the environment and organisms, which is why they are also called Eternal Chemicals. Therefore, they are considered harmful to the environment and human health.

It is expected that all PFAS will be included in the Stockholm Convention's global ban list by 2025 at the latest. This poses a significant challenge for future high-tech industries such as medical and semiconductor that rely on these established ultra-hydrophobic coatings.

INP's recently developed silicone polymer coating, based on plasma technology, is a promising and environmentally friendly alternative to PFAS-containing coatings. It is mechanically and chemically stable, up to 200 nm thick, opaque, storable, washable and reproducible. The coating can be applied to a variety of materials, including metals, plastics and semiconductors.

These properties, combined with the fact that they can be applied to heat-resistant plastics, make silicone polymer coatings ideal for coating medical devices. For example, it could be used to make or surface-modify implantable devices such as pacemakers or artificial joints.

INP is currently working on converting the low-pressure process used to deposit silicone polymer layers to a normal-pressure process. Concepts for scaling up the technology are also under development.

"We are very pleased with the results of our study," said Dr. Frank Hempel, head of INP's Plasma Surface Technology Division. "Silicone polymer layers are a promising alternative to PFAS-containing layers and offer a wide range of application possibilities in various industrial sectors. "