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 xii
... Contact mode .. 185 6.2.3 Tapping Mode 186 6.2.4 6.2.5 6.3.2 6.3.3 7.1.2 Non ... Surface Characterization 208 209 7.3.1 Surface Contour in Biological Surfaces ... Area .. 7.4.4 Material Properties of Fibrous Composites 212 215 216 217 9.1 ...
... Contact mode .. 185 6.2.3 Tapping Mode 186 6.2.4 6.2.5 6.3.2 6.3.3 7.1.2 Non ... Surface Characterization 208 209 7.3.1 Surface Contour in Biological Surfaces ... Area .. 7.4.4 Material Properties of Fibrous Composites 212 215 216 217 9.1 ...
Page 10
... contact area of about 90 μm2 is formed with the oxide - covered silicon sample ( the calculation of the contact area is shown in Sect . 2.3.4 ) . This leads to a contact pressure of 5 MPa for a normal force of 500 μN . Since this ...
... contact area of about 90 μm2 is formed with the oxide - covered silicon sample ( the calculation of the contact area is shown in Sect . 2.3.4 ) . This leads to a contact pressure of 5 MPa for a normal force of 500 μN . Since this ...
Page 12
... area and three for a volume . A strong fact that supports this kind of approach is that measured values of roughness ... contact area Ag that it acts on : = 0 Fo Ag ( 2.11 ) Note that Ag. 12 2. Physical Principles Elastic Bodies.
... area and three for a volume . A strong fact that supports this kind of approach is that measured values of roughness ... contact area Ag that it acts on : = 0 Fo Ag ( 2.11 ) Note that Ag. 12 2. Physical Principles Elastic Bodies.
Page 13
... contact area Ac ( see Fig . 2.7 ) . This means that the stress in the actual contact area can be much larger . The strain is expressed as the dimensionless ratio of the difference in length Al of a strained body and its initial length ...
... contact area Ac ( see Fig . 2.7 ) . This means that the stress in the actual contact area can be much larger . The strain is expressed as the dimensionless ratio of the difference in length Al of a strained body and its initial length ...
Page 15
... contact each other in a point or a line , then the action of the compressive forces results in deformation . As a consequence , the real area of contact changes as shown in Fig . 2.7 . This , of course , has a strong impact on the ...
... contact each other in a point or a line , then the action of the compressive forces results in deformation . As a consequence , the real area of contact changes as shown in Fig . 2.7 . This , of course , has a strong impact on the ...
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