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
... indentation . . . 7. Microscopy Techniques 7.1 Principles of Microscopy Techniques 7.1.1 Light Microscopy Phase - Contrast Microscopy 7.1.3 Interference Microscopy 187 Force Modulation € 188 188 188 190 . 191 193 194 194 196 196 7.1.4 ...
... indentation . . . 7. Microscopy Techniques 7.1 Principles of Microscopy Techniques 7.1.1 Light Microscopy Phase - Contrast Microscopy 7.1.3 Interference Microscopy 187 Force Modulation € 188 188 188 190 . 191 193 194 194 196 196 7.1.4 ...
Page xiii
... Indentation and Adhesion Measurement Procedure . Indentation . Adhesion . . 225 226 228 231 231 232 236 9.3.1 The Attachment Process 236 9.3.2 The Detachment Process 238 9.3.3 Adhesive Properties of the Secretion 239 10. Case Study II ...
... Indentation and Adhesion Measurement Procedure . Indentation . Adhesion . . 225 226 228 231 231 232 236 9.3.1 The Attachment Process 236 9.3.2 The Detachment Process 238 9.3.3 Adhesive Properties of the Secretion 239 10. Case Study II ...
Page 6
... Indentation and adhesion are considered atomic , if the force is of the order of 1 nN , • nano , if the force ranges over tens of nN , micro , if the force ranges from 1 μN to hundreds of μN . Where applicable , the findings in the ...
... Indentation and adhesion are considered atomic , if the force is of the order of 1 nN , • nano , if the force ranges over tens of nN , micro , if the force ranges from 1 μN to hundreds of μN . Where applicable , the findings in the ...
Page 7
... indentation and adhesion ( pull - off force Fpo ) . At zo the two samples make contact . Any further compression of the spring increases the normal force . This initial part of the curve describes the indentation . Upon retraction the ...
... indentation and adhesion ( pull - off force Fpo ) . At zo the two samples make contact . Any further compression of the spring increases the normal force . This initial part of the curve describes the indentation . Upon retraction the ...
Page 10
... indentation . • A simple ball on flat sample setup allows the decoupled determination of normal and tangential forces due to the use of a double - leaf spring . • Both ball and flat samples are commercially available products with ap ...
... indentation . • A simple ball on flat sample setup allows the decoupled determination of normal and tangential forces due to the use of a double - leaf spring . • Both ball and flat samples are commercially available products with ap ...
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