Biological Micro- and Nanotribology: Nature’s SolutionsEver since the genesis of life, and throughout the course its further evolution, Nature has constantly been called upon to act as an engineer in solving technical problems. Organisms have evolved a variety of well-defined shapes and structures. Although often intricate and fragile, they can nonetheless deal with extreme mechanical loads. Some organisms live attached to a substrate; others can also move, fly, swim and dive. These abilities and many more are based on a variety of ingenious structural solutions. Understanding these is of major scientific interest, since it can give insights into the workings of Nature in evolutionary processes. Beyond that, we can discover the detailed chemical and physical properties of the materials which have evolved, can learn about their use as structural elements and their biological role and function. This knowledge is also highly relevant for technical applications by humans. Many of the greatest challenges for today's engineering science involve miniaturization. Insects and other small living creatures have solved many of the same problems during their evolution. Zoologists and morphologists have collected an immense amount of information about the structure of such living micromechanical systems. We have now reached a sophistication beyond the pure descriptive level. Today, advances in physics and chemistry enable us to measure the adhesion, friction, stress and wear of biological structures on the micro- and nanonewton scale. Furthermore, the chemical composition and properties of natural adhesives and lubricants are accessible to chemical analysis. |
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Page ix
... Roughness .. 2.3.2 Elastic Bodies 2.3.3 Viscoelastic Bodies 2.3.4 Contact Mechanics 2.4 Adhesion ... 2.4.1 Molecular Forces 2.4.2 Electrostatic Forces . 2.4.3 Capillary Forces 2.5 Lubrication 3 ་ 7 7 9 11 11 12 13 15 20 23 25 28 32 2.5 ...
... Roughness .. 2.3.2 Elastic Bodies 2.3.3 Viscoelastic Bodies 2.3.4 Contact Mechanics 2.4 Adhesion ... 2.4.1 Molecular Forces 2.4.2 Electrostatic Forces . 2.4.3 Capillary Forces 2.5 Lubrication 3 ་ 7 7 9 11 11 12 13 15 20 23 25 28 32 2.5 ...
Page 7
... roughness , hardness , elasticity , viscoelasticity and contact theory are also introduced . 2.1 Fundamental Definitions The fundamental definitions will be discussed using the SILICON model sys- tem . This setup is treated as the ...
... roughness , hardness , elasticity , viscoelasticity and contact theory are also introduced . 2.1 Fundamental Definitions The fundamental definitions will be discussed using the SILICON model sys- tem . This setup is treated as the ...
Page 10
... roughness [ nm ] 0.17 0.2 thermal conductivity [ W / ( m · K ) ] 1.412 1.2 thermal expansion [ × 10−6 / K ] 2.0 ( RT ) 0.9 electrical resistivity [ 2.cm ] 0.1 1011 - 1012 Young's modulus [ GPa ] 150 73 Poisson ratio 0.28 0.17 a mineral ...
... roughness [ nm ] 0.17 0.2 thermal conductivity [ W / ( m · K ) ] 1.412 1.2 thermal expansion [ × 10−6 / K ] 2.0 ( RT ) 0.9 electrical resistivity [ 2.cm ] 0.1 1011 - 1012 Young's modulus [ GPa ] 150 73 Poisson ratio 0.28 0.17 a mineral ...
Page 11
... roughness several widely accepted pa- rameters are defined . Figure 2.3 shows a roughness profile of a surface . The average roughness Ra represents a ratio of area above and below an imag- inary line of length 7 that is unity . Since ...
... roughness several widely accepted pa- rameters are defined . Figure 2.3 shows a roughness profile of a surface . The average roughness Ra represents a ratio of area above and below an imag- inary line of length 7 that is unity . Since ...
Page 12
... roughness profile . According to the length of the sampling interval the profile is approximated with different sampling errors . is composed of completely random structures , then the spectral density only shows a noisy background ...
... roughness profile . According to the length of the sampling interval the profile is approximated with different sampling errors . is composed of completely random structures , then the spectral density only shows a noisy background ...
Contents
7 | |
Biological Frictional and Adhesive Systems | 78 |
Frictional Devices of Insects | 129 |
Microscale Test Equipment 153 | 152 |
Nanoscale Probe Techniques | 179 |
Microscopy Techniques | 193 |
Samples Sample Preparation | 223 |
Friction | 243 |
Material Properties 251 | 250 |
A Contact Models | 259 |
List of Symbols | 273 |
Index | 299 |
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Biological Micro- and Nanotribology: Nature’s Solutions Matthias Scherge,Stanislav Gorb No preview available - 2010 |
Common terms and phrases
adhesion adsorbed animals applied asperities atoms attachment pads ball and flat beam behavior Biol biological body byssus cantilever capillary action capillary bridge capillary force cartilage cells chemical collagen contact area cuticle decrease deflection deformation distal distance double-layer elastic electron elytra endomysium energy epicuticle epidermal flat sample fluid force curve friction force function glands Hertz humidity hydrophilic hydrophobic increasing indentation insect interaction interlock layer Lett lubrication material mbar measured method microscopy microtrichia molecular molecules monolayer muscle nanometer normal force obtained oscillation oxide Phys plant probe profilometer protein pull-off pull-off force range roughness scanning sclerites secretion Sect sections sensor shear shown in Fig shows silicon SILICON model system sliding velocity smooth solid specimen staining stick/slips structure substrate surface synovial fluid tangential force techniques Technol temperature tissues Tribol Tribology vacuum vibration viscoelastic viscosity water film thickness water molecules