Biomimetics

Velcro tape mimics biological examples of multiple hooked structures such as burs.

Biomimetics or biomimicry is the imitation of the models, systems, and elements of nature for the purpose of solving complex human problems.[1] The terms "biomimetics" and "biomimicry" derive from Ancient Greek: βίος (bios), life, and μίμησις (mīmēsis), imitation, from μιμεῖσθαι (mīmeisthai), to imitate, from μῖμος (mimos), actor. A closely related field is bionics.[2]

Living organisms have evolved well-adapted structures and materials over geological time through natural selection. Biomimetics has given rise to new technologies inspired by biological solutions at macro and nanoscales. Humans have looked at nature for answers to problems throughout our existence. Nature has solved engineering problems such as self-healing abilities, environmental exposure tolerance and resistance, hydrophobicity, self-assembly, and harnessing solar energy.

History

One of the early examples of biomimicry was the study of birds to enable human flight. Although never successful in creating a "flying machine", Leonardo da Vinci (1452–1519) was a keen observer of the anatomy and flight of birds, and made numerous notes and sketches on his observations as well as sketches of "flying machines".[3] The Wright Brothers, who succeeded in flying the first heavier-than-air aircraft in 1903, derived inspiration from observations of pigeons in flight.[4]

Biomimetics was coined by the American biophysicist and polymath Otto Schmitt during the 1950s.[5] It was during his doctoral research that he developed the Schmitt trigger by studying the nerves in squid, attempting to engineer a device that replicated the biological system of nerve propagation.[6] He continued to focus on devices that mimic natural systems and by 1957 he had perceived a converse to the standard view of biophysics at that time, a view he would come to call biomimetics.[5]

Biophysics is not so much a subject matter as it is a point of view. It is an approach to problems of biological science utilizing the theory and technology of the physical sciences. Conversely, biophysics is also a biologist's approach to problems of physical science and engineering, although this aspect has largely been neglected.
— Otto Herbert Schmitt, In Appreciation, A Lifetime of Connections: Otto Herbert Schmitt, 1913 - 1998

A similar term, Bionics was coined by Jack E. Steele in 1960 at Wright-Patterson Air Force Base in Dayton, Ohio where Otto Schmitt also worked. Steele defined bionics as "the science of systems which have some function copied from nature, or which represent characteristics of natural systems or their analogues".[2][7] During a later meeting in 1963 Schmitt stated,

Let us consider what bionics has come to mean operationally and what it or some word like it (I prefer biomimetics) ought to mean in order to make good use of the technical skills of scientists specializing, or rather, I should say, despecializing into this area of research
— Otto Herbert Schmitt, In Appreciation, A Lifetime of Connections: Otto Herbert Schmitt, 1913 - 1998
Velcro was inspired by the tiny hooks found on the surface of burs.

In 1969 the term biomimetics was used by Schmitt to title one of his papers,[8] and by 1974 it had found its way into Webster's Dictionary, bionics entered the same dictionary earlier in 1960 as "a science concerned with the application of data about the functioning of biological systems to the solution of engineering problems". Bionic took on a different connotation when Martin Caidin referenced Jack Steele and his work in the novel Cyborg which later resulted in the 1974 television series The Six Million Dollar Man and its spin-offs. The term bionic then became associated with "the use of electronically operated artificial body parts" and "having ordinary human powers increased by or as if by the aid of such devices".[9] Because the term bionic took on the implication of supernatural strength, the scientific community in English speaking countries largely abandoned it.[10]

The term biomimicry appeared as early as 1982.[11] Biomimicry was popularized by scientist and author Janine Benyus in her 1997 book Biomimicry: Innovation Inspired by Nature. Biomimicry is defined in the book as a "new science that studies nature's models and then imitates or takes inspiration from these designs and processes to solve human problems". Benyus suggests looking to Nature as a "Model, Measure, and Mentor" and emphasizes sustainability as an objective of biomimicry.[12]

Existing commercialized applications

Fabrication

Electron micrograph of rod shaped TMV particles.
Scanning electron micrograph of rod shaped tobacco mosaic virus particles

Biomorphic mineralization is a technique that produces materials with morphologies and structures resembling those of natural living organisms by using bio-structures as templates for mineralization. Compared to other methods of material production, biomorphic mineralization is facile, environmentally benign and economic.[13]

Display technology

Further information: Structural coloration and Patterns in nature
Morpho butterfly.
Vibrant blue color of Morpho butterfly due to structural coloration

Morpho butterfly wings contain microstructures that create its coloring effect through structural coloration rather than pigmentation. Incident light waves are reflected at specific wavelengths to create vibrant colors due to multilayer interference, diffraction, thin film interference, and scattering properties.[14] The scales of these butterflies consist of microstructures such as ridges, cross-ribs, ridge-lamellae, and microribs that have been shown to be responsible for coloration. The structural color has been simply explained as the interference due to alternating layers of cuticle and air using a model of multilayer interference. The same principles behind the coloration of soap bubbles apply to butterfly wings. The color of butterfly wings is due to multiple instances of constructive interference from structures such as this. The photonic microstructure of butterfly wings can be replicated through biomorphic mineralization to yield similar properties. The photonic microstructures can be replicated using metal oxides or metal alkoxides such as titanium sulfate (TiSO4), zirconium oxide (ZrO2), and aluminium oxide (Al2O3). An alternative method of vapor-phase oxidation of SiH4 on the template surface was found to preserve delicate structural features of the microstructure.[15] A display technology ("Mirasol") based on the reflective properties of Morpho butterfly wings was commercialized by Qualcomm in 2007. The technology uses Interferometric Modulation to reflect light so only the desired color is visible in each individual pixel of the display.[16]

Possible future applications

Leonardo da Vinci's design for a flying machine with wings based closely upon the structure of bat wings

Biomimetics could in principle be applied in many fields. Because of the complexity of biological systems, the number of features that might be imitated is large. Biomimetic applications are at various stages of development from technologies that might become commercially usable to prototypes.[17]

Prototypes

Researchers studied the termite's ability to maintain virtually constant temperature and humidity in their termite mounds in Africa despite outside temperatures that vary from 1.5 °C to 40 °C (35 °F to 104 °F). Researchers initially scanned a termite mound and created 3-D images of the mound structure, which revealed construction that could influence human building design. The Eastgate Centre, a mid-rise office complex in Harare, Zimbabwe,[18] stays cool without air conditioning and uses only 10% of the energy of a conventional building of the same size.

In structural engineering, the Swiss Federal Institute of Technology (EPFL) has incorporated biomimetic characteristics in an adaptive deployable "tensegrity" bridge. The bridge can carry out self-diagnosis and self-repair.[19]

Technologies

Practical underwater adhesion is an engineering challenge since current technology is unable to stick surface strongly underwater because of barriers such as hydration layers and contaminants on surfaces. However, marine mussels can stick easily and efficiently to surfaces underwater under the harsh conditions of the ocean. They use strong filaments to adhere to rocks in the inter-tidal zones of wave-swept beaches, preventing them from being swept away in strong sea currents. Mussel foot proteins attach the filaments to rocks, boats and practically any surface in nature including other mussels. These proteins contain a mix of amino acid residues which has been adapted specifically for adhesive purposes. Researchers from the University of California Santa Barbara borrowed and simplified chemistries that the mussel foot uses to overcome this engineering challenge of wet adhesion to create copolyampholytes,[20] and one-component adhesive systems[21] with potential for employment in nanofabrication protocols.

Mimicking the diving behavior of animals, researchers discovered in 2013 that humans have a similar capacity to lower brain temperature and suppress metabolism for neuroprotection.[22] This has now opened a real possibility of devising means for humans to sustain this state, not unlike the elusive and enigmatic feat of animal hibernation, e.g., lemurs (primates) and bears. This would have profound biomedical implications for healthcare and for treating an unmatched range and diversity of serious life-threatening clinical conditions, and in a fully personalized way, things like stroke, blood-loss, burns, cancer, chronic obesity, epileptic seizures, etc. An experimental trial, recently conducted in Sweden seemingly resulted in a sustainable variant of this state in a human breath-hold diver.[23]

Spider web silk is as strong as the Kevlar used in bulletproof vests. Engineers could in principle use such a material, if it could be reengineered to have a long enough life, for parachute lines, suspension bridge cables, artificial ligaments for medicine, and other purposes.[12] Other research has proposed adhesive glue from mussels, solar cells made like leaves, fabric that emulates shark skin, harvesting water from fog like a beetle, and more.[18] Murray's law, which in conventional form determined the optimum diameter of blood vessels, has been re-derived to provide simple equations for the pipe or tube diameter which gives a minimum mass engineering system.[24] Aircraft wing design [3] and flight techniques[25] are being inspired by birds and bats.

Robots based on the physiology and methods of locomotion of animals include BionicKangaroo which moves like a kangaroo, saving energy from one jump and transferring it to its next jump,[26] and climbing robots,[27] boots and tape[28] mimicking geckos feet and their ability for adhesive reversal. Nanotechnology surfaces that recreate properties of shark skin are intended to enable more efficient movement through water.[29] Tire treads have been inspired by the toe pads of tree frogs.[30] The self-sharpening teeth of many animals have been copied to make better cutting tools.[31] Protein folding is used to control material formation for self-assembled functional nanostructures.[32] The Structural coloration of butterfly wings is adapted to provide improved interferometric modulator displays and everlasting colours.[33] New ceramics copy the properties of seashells.[34] Polar bear fur has inspired the design of thermal collectors and clothing.[35] The arrangement of leaves on a plant has been adapted for better solar power collection.[36] The light refractive properties of the moth's eye has been studied to reduce the reflectivity of solar panels.[37] Self-healing materials, polymers and composite materials capable of mending cracks have been produced based on biological materials.[38]

The Bombardier beetle's powerful repellent spray inspired a Swedish company to develop a "micro mist" spray technology, which is claimed to have a low carbon impact (compared to aerosol sprays). The beetle mixes chemicals and releases its spray via a steerable nozzle at the end of its abdomen, stinging and confusing the victim.[39]

Most viruses have an outer capsule 20 to 300 nm in diameter. Virus capsules are remarkably robust and capable of withstanding temperatures as high as 60 °C; they are stable across the pH range 2-10.[13] Viral capsules can be used to create nano device components such as nanowires, nanotubes, and quantum dots. Tubular virus particles such as the tobacco mosaic virus (TMV) can be used as templates to create nanofibers and nanotubes, since both the inner and outer layers of the virus are charged surfaces which can induce nucleation of crystal growth. This was demonstrated through the production of platinum and gold nanotubes using TMV as a template.[40] Mineralized virus particles have been shown to withstand various pH values by mineralizing the viruses with different materials such as silicon, PbS, and CdS and could therefore serve as a useful carriers of material.[41] A spherical plant virus called cowpea chlorotic mottle virus (CCMV) has interesting expanding properties when exposed to environments of pH higher than 6.5. Above this pH, 60 independent pores with diameters about 2 nm begin to exchange substance with the environment. The structural transition of the viral capsid can be utilized in Biomorphic mineralization for selective uptake and deposition of minerals by controlling the solution pH. Possible applications include using the viral cage to produce uniformly shaped and sized quantum dot semiconductor nanoparticles through a series of pH washes. This is an alternative to the apoferritin cage technique currently used to synthesize uniform CdSe nanoparticles.[42] Such materials could also be used for targeted drug delivery since particles release contents upon exposure to specific pH levels.

See also

References

  1. ↑ Vincent, Julian F. V.; et al. (22 August 2006). "Biomimetics: its practice and theory". doi:10.1098/rsif.2006.0127. Retrieved 7 April 2015.
  2. 1 2 Mary McCarty. "Life of bionics founder a fine adventure". Dayton Daily News, 29 January 2009.
  3. 1 2 Romei, Francesca (2008). Leonardo Da Vinci. The Oliver Press. p. 56. ISBN 978-1-934545-00-3.
  4. ↑ Howard, Fred (1998). Wilbur and Orville: A Biography of the Wright Brothers. Dober Publications. p. 33. ISBN 978-0-486-40297-0.
  5. 1 2 Vincent, Julian F.V.; Bogatyreva, Olga A.; Bogatyrev, Nikolaj R.; Bowyer, Adrian; Pahl, Anja-Karina (21 August 2006). "Biomimetics: its practice and theory". Journal of The Royal Society Interface 3 (9): 471–482. doi:10.1098/rsif.2006.0127.
  6. ↑ "Otto H. Schmitt, Como People of the Past". Connie Sullivan, Como History Article.
  7. ↑ Vincent, Julian F. V. (November 2009). "Biomimetics -- a review". Journal of Engineering in Medicine. Proceedings of the Institution of Mechanical Engineers. Part H 223 (8): 919–939. doi:10.1243/09544119JEIM561.
  8. ↑ Schmitt O. Third Int. Biophysics Congress. 1969. Some interesting and useful biomimetic transforms. p. 297.
  9. ↑ Compact Oxford English Dictionary. 2008. ISBN 978-0-19-953296-4.
  10. ↑ Vincent, JFV (2009). "Biomimetics — a review". Proc. I. Mech. E. 223: 919–939.
  11. ↑ Merrill, Connie Lange (1982). "Biomimicry of the Dioxygen Active Site in the Copper Proteins Hemocyanin and Cytochrome Oxidase". Rice University.
  12. 1 2 Benyus, Janine (1997). Biomimicry: Innovation Inspired by Nature. New York, USA: William Morrow & Company. ISBN 978-0-688-16099-9.
  13. 1 2 Tong-Xiang, Suk-Kwun, Di Zhang. "Biomorphic Mineralization: From biology to materials." State Key Lab of Metal Matrix Composites. Shanghai: Shanghai Jiaotong University , n.d. 545-1000.
  14. ↑ Ball, Philip (May 2012). "Scientific American". Nature's Color Tricks 306. pp. 74–79. doi:10.1038/scientificamerican0512-74. Retrieved 3 June 2012.
  15. ↑ Cook G., Timms P.L., Goltner-Spickermann C. Angew. "Chem Int Ed." 2003. 42:557.
  16. ↑ Cathey, Jim (7 January 2010). "Nature Knows Best: What Burrs, Geckos and Termites Teach Us About Design". Qualcomm. Retrieved 24 August 2015.
  17. ↑ Bharat Bhushan (15 March 2009) Biomimetics: lessons from nature–an overview http://rsta.royalsocietypublishing.org/content/367/1893/1445.full
  18. 1 2 Biomimicry Examples — Biomimicry Institute
  19. ↑ Korkmaz, Sinan; Bel Hadj Ali, Nizar; Smith, Ian F.C. (2011). "Determining Control Strategies for Damage Tolerance of an Active Tensegrity Structure" (PDF). Engineering Structures 33 (6): 1930–1939. doi:10.1016/j.engstruct.2011.02.031.
  20. ↑ Seo, Sungbaek; Das, Saurabh; Zalicki, Piotr J.; Mirshafian, Razieh; Eisenbach, Claus D.; Israelachvili, Jacob N.; Waite, J. Herbert; Ahn, B. Kollbe (2015-07-29). "Microphase Behavior and Enhanced Wet-Cohesion of Synthetic Copolyampholytes Inspired by a Mussel Foot Protein". Journal of the American Chemical Society 137 (29): 9214–9217. doi:10.1021/jacs.5b03827. ISSN 0002-7863.
  21. ↑ Ahn, B. Kollbe; Das, Saurabh; Linstadt, Roscoe; Kaufman, Yair; Martinez-Rodriguez, Nadine R.; Mirshafian, Razieh; Kesselman, Ellina; Talmon, Yeshayahu; Lipshutz, Bruce H. (2015-10-19). "High-performance mussel-inspired adhesives of reduced complexity". Nature Communications 6. doi:10.1038/ncomms9663.
  22. ↑ Murat, S. "J. Appl. Physiol." 2013. 110:(2): 573-574.
  23. ↑ "Life-science start-up focused on bringing". The Dive Lab. Retrieved 17 July 2014.
  24. ↑ Williams, Hugo R.; Trask, Richard S.; Weaver, Paul M.; Bond, Ian P. (2008). "Minimum mass vascular networks in multifunctional materials". Journal of the Royal Society Interface 5 (18): 55–65. doi:10.1098/rsif.2007.1022. PMC 2605499. PMID 17426011.
  25. ↑ "Drone with legs can perch, watch and walk like a bird". Tech. New Scientist. 27 January 2014. Retrieved 17 July 2014.
  26. ↑ Ackerman, Evan (2 Apr 2014). "Festo's Newest Robot Is a Hopping Bionic Kangaroo". spectrum.ieee.org. IEEE Spectrum. Retrieved 17 Apr 2014.
  27. ↑ Gecko-like robot scampers up the wall – tech – 23 May 2006 – New Scientist Tech
  28. ↑ "Gecko Tape". Stanford University. Retrieved 17 July 2014.
  29. ↑ "'Inspired by Nature'". Sharklet Technologies Inc. 2010. Retrieved 6 June 2014.
  30. ↑ Tire treads inspired by tree frogs
  31. ↑ Wiley: self-sharpening teeth
  32. ↑ Self-assembled nanostructures
  33. ↑ IOP Science: structurally colored displays
  34. ↑ http://onlinelibrary.wiley.com/doi/10.1002/adma.201202079/abstract|Yao, Y., Wang, Q., Wang, H., Zhang, B., Zhao, C., Wang, Z., Xu, Z., Wu, Y., Huang, W., Qian, P.-Y. and Zhang, X. X. (2013), Bio-Assembled Nanocomposites in Conch Shells Exhibit Giant Electret Hysteresis. Adv. Mater., 25: 711–718. doi: 10.1002/adma.201202079
  35. ↑ http://rsta.royalsocietypublishing.org/content/367/1894/1749|Bionics in textiles: flexible and translucent thermal insulations for solar thermal applications|Published 29 March 2009 doi: 10.1098/rsta.2009.0019 Phil. Trans. R. Soc. A 13 May 2009 vol. 367 no. 1894 1749-1758
  36. ↑ "The Secret of the Fibonacci Sequence in Trees". 2011 Winning Essays. American Museum of Natural History. 1 May 2014. Retrieved 17 July 2014.
  37. ↑ Wilson, S.J. Wilson; Hutley, M.C. (1982). "The Optical Properties of 'Moth Eye' Antireflection Surfaces". Journal of Modern Optics 29 (7): 993–1009.
  38. ↑ Zang, M.Q. (2008). "Self healing in polymers and polymer composites. Concepts, realization and outlook: A review". Polymer Letters 2 (4): 238–250. doi:10.3144/expresspolymlett.2008.29.
  39. ↑ Swedish Biomimetics: The μMist Platform Technology. Retrieved 3 June 2012.
  40. ↑ Dujardin E., Peet C. "Nano Letters" 2003. 3:413.
  41. ↑ Shenton W. Douglas, Young M. "Advanced Materials" 1999. 11:253.
  42. ↑ Ischiro Yamashita, Junko Hayashi, Mashahiko Hara. "Bio-template Synthesis of Uniform CdSe Nanoparticles Using Cage-shaped Protein, Apoferritin." Chemistry Letters (2004). Volume: 33, Issue: 9. 1158–1159.

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