Surface modification

Plasma printing

© Photo Fraunhofer IST, Falko Oldenburg

Under atmospheric pressure, plasma can be produced even in very small volumes with dimensions of just a few micrometers so that the local functionalisation of surfaces is possible. Plasma printing is an innovative process for the local modification of surfaces: a structured dielectric forms cavities in which the plasma develops. The typical dimensions of the cavities are from a few tens to a few hundred μm. In addition to the position-specific modification of surfaces, this process also supports structured layer precipitation and functionalisation. Numerous functional groups can be impressed on the substrate, similar to a stamp, depending on the chosen to discharge conditions. Suitable substrates include polymers, glass and silicon. Surfaces with any geometries such as arrays of spots, with special surface characteristics such as hydrophilic or hydrophobic properties, or with targeted chemical functionalisation can be produced using the plasma printing process.

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Biofunctional films

© Photo Fraunhofer IST, Falko Oldenburg

Plasma in the bag.

Plastics are increasingly being used in medical technology, especially for disposables. For many biological or medical applications however, the various surfaces first have to be modified in an initial step before they can for example be coated in a second step. Disposables often require bio-compatible surfaces in order to promote cell growth on the surface, specifically prevent it or to provide functional groups for the chemical coupling of biomolecules.

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Bonding processes

© Photo Fraunhofer IST, Falko Oldenburg

New material combinations are of high importance for innovative industrial processes and products. However, the joining technology is often the weak point of these products. In addition to inadequate adhesion of the adhesives on the materials, migration through the adhesive in particular can significantly reduce the long-term durability of the materials.

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