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Home  > Raw materials & technologies  > Applications  > Protective & Marine coatings  > The subsurface composition of a material i...

Monday, 23 September 2019
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Raw materials & technologies, Applications, Protective & Marine coatings

The subsurface composition of a material influences the adhesion of bacteria

Wednesday, 2 May 2012

Antibacterial coatings are without doubts important, especially for hygienic surroundings in the medicine. Researchers from Saarland University looked which forces of the bacteria and proteins are necessary for their adhesion. Interesting for further new coating developments.

Controlling the interface between bacteria and solid materials has become an important task

Source: Sulabaja - Fotolia.com

Controlling the interface between bacteria and solid materials has become an important task

Source: Sulabaja - Fotolia.com

For a fundamental and comprehensive understanding of adhesion it is necessary to seek quantitative information about the involved interactions. Most studies concentrate on the modification of the surface (chemical composition, hydrophobicity, or topography) neglecting, however, the influence of the bulk material, which always contributes to the overall interaction via van der Waals forces. In this study, the researchers applied AFM force spectroscopy and flow chamber experiments to probe the adhesion of Staphylococcus carnosus to a set of tailored Si wafers, allowing for a separation of short- and long-range forces. They provide experimental evidence that the subsurface composition of a substrate influences bacterial adhesion. A coarse estimation of the strength of the van der Waals forces via the involved Hamaker constants substantiates the experimental results. The results demonstrate that the uppermost layer is not solely responsible for the strength of adhesion. Rather, for all kinds of adhesion studies, it is equally important to consider the contribution of the subsurface.

You get the abstract here:

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