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Plant Surfaces: Structures and Functions for Biomimetic Applications

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Springer Handbook of Nanotechnology

Part of the book series: Springer Handbooks ((SHB))

Abstract

This chapter presents an overview of plant surface structures and their evolution, combines surface chemistry and architecture with their functions and refers to possible biomimetic applications .

Within some 3.5 billion years biological species evolved highly complex multifunctional surfaces for interacting with their environments, providing some 10 million living prototypes (i. e., estimated number of existing plants and animals) for engineers. The complexity of the hierarchical structures and their functionality in biological organisms surpasses all abiotic natural surfaces: even superhydrophobicity is restricted in nature to living organisms and was probably a key evolutionary step in the invasion of terrestrial habitats some 350−450 million years ago by plants and insects. Special attention should be paid to the fact that global environmental change implies a dramatic loss of species and with it many biological role models .

Plants, the dominating group of organisms on our planet, are sessile organisms with large multifunctional surfaces and thus exhibit particular intriguing features. Superhydrophilicity and superhydrophobicity are focal points in this chapter. We estimate that superhydrophobic plant leaves (e. g., grasses) comprise in total an area of around 250 million km2, which is about 50% of the total surface of our planet.

A survey of structures and functions based on our own examinations of almost 20000 species is provided; for further references we refer to [36.1]. A basic difference exists between aquatic nonvascular and land-living vascular plants; the latter exhibit a particularly intriguing surface chemistry and architecture. The diversity of features is described in detail according to their hierarchical structural order. The first underlying and essential feature is the polymer cuticle superimposed by epicuticular wax and the curvature of single cells up to complex multicellular structures . A descriptive terminology for this diversity is provided.

Simplified, the functions of plant surface characteristics may be grouped into six categories:

  1. 1.

    Mechanical properties

  2. 2.

    Influence on reflection and absorption of spectral radiation

  3. 3.

    Reduction of water loss or increase of water uptake, moisture harvesting

  4. 4.

    Adhesion and nonadhesion (lotus effect , insect trapping)

  5. 5.

    Drag and turbulence increase

  6. 6.

    Air retention underwater for drag reduction or gas exchange (Salvinia effect ).

This list is far from complete.

A short overview of the history of bionics and the impressive spectrum of existing and anticipated biomimetic applications are provided. The major challenge for engineers and materials scientists, the durability of the fragile nanocoatings, is also discussed.

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Acknowledgements

This survey is based on over three decades of research on surfaces by a large working group with ever-changing members: first and foremost, we acknowledge all the students who had successful theses in this field. Their names can be found in the papers quoted in the references. We acknowledge the discussions with colleagues and friends in particular we would like to thank Horst Bleckmann (Bonn), Alfred Leder, Martin Brede (both Rostock), Thomas Schimmel, Stefan Walheim, Markus Moosmann, Torsten Scherer (all KIT Karlsruhe), Walter Erdelen (former UNESCO Paris), Anna-Julia Schulte (Euskirchen), Daud Rafiqpoor, Birte Böhnlein, Peter Häger (all Bonn), Gerhard Gottsberger (Ulm), Stanislav Gorb (Kiel), Georg Noga (Bonn), and Maximilian Weigend (Bonn). Technical assistance was provided over the years by Hans-Jürgen Ensikat, the late Wolfgang Roden, Alexandra Runge, Bernd Haeseling, and Danica Christensen. Our work in bionics and biodiversity was supported by the Deutsche Bundesstiftung Umwelt DBU, the German Research Council DFG, the Federal Ministry for Science and Education BMBF, and the Academy of Science and Literature in Mainz.

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  1. Nees-Institute for Biodiversity of Plants, University of Bonn, Venusbergweg 22, 53115, Bonn, Germany

    Wilhelm Barthlott & Matthias Mail

  2. Nanoprobe Lab for Bio- & Nanotechnology & Biomimetics, The Ohio State University, 201 W. 19th Ave., OH 43210-1107, Columbus, USA

    Bharat Bhushan

  3. Dept. of Life Science, Biology & Nanobiotechnology, Rhine-Waal University of Applied Science, Marie-Curie-Str. 1, Gebäude 11, 2. Stock, Raum 17, 47533, Kleve, Germany

    Kerstin Koch

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Barthlott, W., Mail, M., Bhushan, B., Koch, K. (2017). Plant Surfaces: Structures and Functions for Biomimetic Applications. In: Bhushan, B. (eds) Springer Handbook of Nanotechnology. Springer Handbooks. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-54357-3_36

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  • DOI: https://doi.org/10.1007/978-3-662-54357-3_36

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-662-54355-9

  • Online ISBN: 978-3-662-54357-3

  • eBook Packages: EngineeringEngineering (R0)

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