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Published byImogene Perry Modified over 5 years ago
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The challenge is to self-assemble straight nanotubes all exactly the same diameter (and chirality) and the same length
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Paper straws – all same diameter
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Paper straws – all same diameter
Stuck together
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Paper straws – all same diameter
Stuck together Perfect hexagonal packing
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Paper straws – all same diameter
Stuck together Perfect hexagonal packing Weak (Postit?) glue
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Paper straws – all same diameter
Stuck together Perfect hexagonal packing Weak (Postit?) glue Intinsically very strong
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The tubes stick together by their intrinsic “glue”
Van der Waal’s Forces
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A bundle of 1015 - a thousand million million tubes
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Double Wallled NanoTubes by CCVD
Hexagonal packing 11.57nm Double Wallled NanoTubes by CCVD Endo et al., Nature 433, 476 (2005)
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This material will be 100 x stronger than steel and 1/6th the weight
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a thousand million million tubes
A bundle of – 1,000,000,000,000,000 a thousand million million tubes
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It may be possible to anneal them out
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Defects will not propagate
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High purity DWNT by CCVD Method,
by M. Endo et al., Nature 433, 476 (2005) 11.57nm Hexagonal packing structure
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Coalescence acceleration by boron doping
Without boron addition With boron addition 50 nm 50 nm HTT1500 5 nm 5 nm M. Endo et al., Nano Lett., 5, 1099 (2005)
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By M.Endo
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Cross-section of a bundle of single walled nanotubes
Thess et al Nature
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Cross-section of a bundle of single walled nanotubes
Thess et al Nature
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1.4nm
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SWNT Bundles
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The challenge is to self-assemble straight nanotubes all exactly the same diameter (and chirality) and the same length
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