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 4
... decreased dramatically and have reached the nanorange for the case of IBM's millepede , an AFM - based storage device [ 1 ] . More and more conventional mechanical de- vices , for instance motors [ 2 ] , are becoming miniaturized ...
... decreased dramatically and have reached the nanorange for the case of IBM's millepede , an AFM - based storage device [ 1 ] . More and more conventional mechanical de- vices , for instance motors [ 2 ] , are becoming miniaturized ...
Page 7
... decreases . The extension of the curve to negative force values depends on the adhesive properties of the materials . the ball is attached to a spring to determine the. Physical Principles of Micro- and Nanotribology ་ Fundamental ...
... decreases . The extension of the curve to negative force values depends on the adhesive properties of the materials . the ball is attached to a spring to determine the. Physical Principles of Micro- and Nanotribology ་ Fundamental ...
Page 14
... decreases exponen- tially . In the Kelvin - Voigt model , Fig . 2.6b , the acting force is distributed a ) - a ω b ) σ 20 w σ ω לר H www www www . ww t Fig . 2.6 . Viscoelastic models . ( a ) The Maxwell model : the diagram shows the ...
... decreases exponen- tially . In the Kelvin - Voigt model , Fig . 2.6b , the acting force is distributed a ) - a ω b ) σ 20 w σ ω לר H www www www . ww t Fig . 2.6 . Viscoelastic models . ( a ) The Maxwell model : the diagram shows the ...
Page 15
... decrease of the internal stress . • Creep : in a material , which remains under constant stress , a progressive deformation can be detected . ⚫ Hysteresis : a material , which is stressed and relieved continuously , possesses a modulus ...
... decrease of the internal stress . • Creep : in a material , which remains under constant stress , a progressive deformation can be detected . ⚫ Hysteresis : a material , which is stressed and relieved continuously , possesses a modulus ...
Page 21
... decreasing rough- ness , showing that adhesion has a distinct range of action . In addition to low roughness , soft ... decreases and be- comes zero . Due to adhesion the two samples stick and the spring becomes deflected in the opposite ...
... decreasing rough- ness , showing that adhesion has a distinct range of action . In addition to low roughness , soft ... decreases and be- comes zero . Due to adhesion the two samples stick and the spring becomes deflected in the opposite ...
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