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Bio-inspired Engineering
HW-1
Submitted byArunkumar Rengaraj
Submitted ToProf. Kwon
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1. What is the mechanism of controlled adhesion by wet adhesion that is based on capillary interaction?
• The fact that a fly can walk on a vertical glass window is due to capillary bridges formed at the tip of many thin hair-like fibers, which cover the attachment organs of the
fly; Figure 1.
• When two elastic solids with rough surfaces are squeezed together, the solids will in general not make contact everywhere in the apparent contact area, but only at a
distribution of asperity contact spots (Those act like capillary) Figure 2
Figure 1 Figure 2
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2. What is the mechanism of controlled adhesion by dry adhesion using van der Waals forces.
• The toes of live Tokay geckos were highly hydrophobic, and adhered equally well to strongly hydrophobic and strongly hydrophilic, polarizable surfaces
• A van der Waals mechanism implies that the remarkable adhesive properties of gecko setae are merely a result of the size and shape of the tips, and are not
strongly affected by surface chemistry
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What is the mechanism of controlled adhesion of Octopus and Leech?
• Octopuses use suckers to anchor the body to the substrate or to grasp
• observe some morphological differences with respect to the octopus species previously studied (i.e., Octopus joubini, Octopus maya, Octopus bimaculoides/bimaculatus and
Eledone cirrosa).
• In particular, in O. vulgaris the acetabular chamber, that is a hollow spherical cavity in other octopuses, shows an ellipsoidal cavity which roof has an important protuberance
with surface roughness.
• We hypothesize that the process of continuous adhesion is achieved by sealing the orifice between acetabulum and infundibulum portions via the acetabular protuberance
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What do you want to apply the above mechanisms to?
I want to develop biomimetic material ,which having surface property to attach with the different type of surface
So I can use this material for different application
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