Mikrobielle Werkstoffzerstörung – Simulation, Schadensfälle und Gegenmaßnahmen für anorganische nichtmetallische Werkstoffe: Biodeteriorationsprozesse an anorganischen Werkstoffen und mögliche Gegenmaßnahmen

Warscheid, Thomas; Krumbein, Wolfgang E.

doi:10.1002/maco.19940450207

Cited by 13 publications

(1 citation statement)

References 24 publications

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“…Numerous studies have shown that certain bacteria, fungi and algae are able to colonize facades, roof tiles, building stone, concrete and even glass (Bock andSand 1993, Warscheid andBraams 2000). These organisms not only produce optical disturbances; due to the release of organic and inorganic acids, they also cause serious damage (Warscheid and Krumbein 1994). The latter has been estimated at 2-4 billion € per year in Germany alone (Flemming 1995).…”

Section: From Plant Leaves To Technical Surfacesmentioning

confidence: 99%

The dream of staying clean: Lotus and biomimetic surfaces

Solga¹,

Cerman²,

Striffler³

et al. 2007

Bioinspir. Biomim.

315

230

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The Lotus has been the symbol of purity for thousands of years; contaminations and pathogens are washed off the surfaces of Lotus and some other plants with rain or even dew. After the introduction of scanning electron microscopy, we were able to resolve the mechanism behind this phenomenon. It took some further decades before in-depth studies on self-cleaning with plants were conducted and the effect could be understood in detail. We identified extreme water-repellency ('superhydrophobicity'), characterized by very high contact angles and low sliding angles, as the prerequisite for self-cleaning properties. We could show that the combination of two factors is necessary for obtaining a high degree of water-repellency: (1) low energy surfaces being hydrophobic and (2) surface structures that significantly increase hydrophobicity. It is suggested that this mechanism plays an important role in the protection of plants against pathogens. Our technological application of this effect has resulted in the development of successful, eco-friendly and sustainable industrial products. Another interesting property was found with superhydrophobic surfaces of certain aquatic and semi-aquatic plants and animals: here a layer of air under water is retained. We present a new approach of using this feature for creating structured, air-retaining surfaces for technical underwater applications. It is proposed that such surfaces can reduce significantly the drag of large ships. We conclude that basic biological research is of particular importance for true innovation. Our research on superhydrophobic self-cleaning biological surfaces and the development of similar engineered materials suggests that biomimicry is a matter of multi-stage processes rather than a simple copying of biological developments.

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Section: From Plant Leaves To Technical Surfacesmentioning

confidence: 99%