شگفتی های نانو در طبیعت
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شگفتی های نانو در طبیعت. محمد ابراهیم بحرالعلوم بخش مهندسی مواد دانشکده مهندسی دانشگاه شیراز. به نام آفریدگار زیبائی ها. Butterfly wings come in a variety of colours and patterns. Different types of colour. Chemical colour Physical (Structural) colour. Iridescence in Nature. - PowerPoint PPT PresentationTRANSCRIPT
در نانو های در شگفتی نانو های شگفتیطبیعتطبیعت
بحرالعلوم ابراهیم بحرالعلوم محمد ابراهیم محمد
مواد مهندسی مواد بخش مهندسی بخشمهندسی مهندسی دانشکده دانشکده
شیراز شیراز دانشگاه دانشگاه
به نام آفریدگار به نام آفریدگار زیبائی هازیبائی ها
Butterfly wings come in a variety of Butterfly wings come in a variety of colours and patternscolours and patterns
Different types of colourDifferent types of colour
• Chemical colour Chemical colour
• Physical (Structural) colourPhysical (Structural) colour
Iridescence in NatureIridescence in Nature
Constructive interference produces physical colours
Colors of a butterfly's wingsColors of a butterfly's wings
The underside of a butterfly wingsChemical colour
The topside of a butterfly wingsPhysical (Stuctural) colour
Light microscopic images
Electron microscopic images×50 ×200 ×1000
×5000
Wing structure and microstructure of a butterfly wing scale
Constructive interference amplifies the colors of a butterfly's wings
Electron microscopic images of a scale of a Electron microscopic images of a scale of a butterfly wing showing its butterfly wing showing its nanostructurenanostructure
SEM micrograph showing a longitudinal view of a scale. Scale bar, 1 μm.
TEM micrograph showing a cross section through the scale. Scale bar, 2.5 μm.
Blue light has a wavelength range from 400 to 480 nm. The slits in the scales of a butterfly wing are 200 nm apart.
Because the distance between slits corresponds to half of the wavelength of blue light, this is the wavelength that undergoes constructive interference.
The colouration of butterfly wings The colouration of butterfly wings serves many purposesserves many purposes
• Camouflage, in which the color of the animal Camouflage, in which the color of the animal helps it blend into the environment, hiding the helps it blend into the environment, hiding the insect. insect.
• Attracting and finding mates, who look for Attracting and finding mates, who look for certain colours and patterns. certain colours and patterns.
The colouration of butterfly wings The colouration of butterfly wings serves many purposesserves many purposes
• Deceiving predators into thinking they're bigger than Deceiving predators into thinking they're bigger than they really are. Some wings make the butterfly look like they really are. Some wings make the butterfly look like the face of a larger animal (like an owl), scaring away the face of a larger animal (like an owl), scaring away some predators. some predators.
• Soaking up heat: dark-colored scales soak up heat very Soaking up heat: dark-colored scales soak up heat very well. Butterflies are cold-blooded. When they get too well. Butterflies are cold-blooded. When they get too cold, they warm themselves in the sun. cold, they warm themselves in the sun.
Nanostructures on black butterfly Nanostructures on black butterfly wings help them to collect sunlight wings help them to collect sunlight
Butterfly wings may rank among the most delicate Butterfly wings may rank among the most delicate nanostructures in nature.nanostructures in nature.
They have given researchers powerful inspiration for They have given researchers powerful inspiration for new solar cell technology.new solar cell technology.
Nanostructure which gives hydrophobic properties
The iridescent colour of a peacock originates in the fine side branches of the feathers.
The actual colour depends on the exact position of the spot on the branch and on the angle of the incident light.
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