ENGRI1110_Lect28_Nov4_posted - Umbach Office Hours:...

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Umbach Office Hours: Wednesday: 4:30 – 5:30 Thursday: canceled Friday: reschedule to 1:30-2:30
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NRAM NRAM TM TM by Nantero by Nantero Applied charge make CNT ribbons bend down to touch the substrate or bend up back to its original state. Ribbon-up gives 'zero' and ribbon-down is 'one'. Source: http://www.nantero.com/nram.html
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Source: http://www.nantero.com/nram.html Bistable State Bistable State
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Source: http://www.nantero.com/nram.html Bistable State
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Source: http://www.nantero.com/nram.html Read-out Read-out
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Source: http://www.nantero.com/nram.html Read-out
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NRAM Challenges NRAM Challenges Millions of CNT’s patterned lithographically Alignment required for proper bending Uniform length Electrical contact to interconnects
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Cathode Ray Tube Cathode Ray Tube
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CNTs when electrified emit electrons from their tips Lightning rods CNTs are so sharp – emit at low fields 1-3 V/m vs. 50 -100 V/m for Mo Carbon Nanotubes as Field Emitters Carbon Nanotubes as Field Emitters
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Field Emission Display Field Emission Display CRT: electron gun FED: microfabricated tips FEDs are: Flat Thin Low power
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Field Emission Display Field Emission Display www.samsung.com www.sony.com
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Properties Properties Property SWNT Benchmark Size d: 0.6 – 1.8 nm Litho: 50 nm Density 1.3 – 1.4 g/cm 3 Al: 2.7 g/cm 3 Steel: 7.8 g/cm 3 Strength 50 - 200 GPa Steel: 1.5 GPa Resilience Bendable at large angles Metals and carbon fracture Current 1B amp/cm 2 Cu: 1M
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Properties II Properties II Property SWNT Benchmark Field Emission 1-3 V/m Mo: 50 -100 V/ m Heat Transmission 6,000 W/mK Diamond: 3,300 W/mK Stability 2800 °C 750 °C (air) Most wires melt 600 -1000 °C Cost $100 – 1000/g Au: $20/g
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Biomimetics Read Appendix I, “Learning from Old Mother Nature”
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Biomimicry Studies nature’s best ideas and then imitates these designs and processes to solve human problems Nature as model, measure & mentor
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Credit: (left) www.all-creatures.org (right) www.nikonsmallworld.com/gallery Photo on right by Tracey E. Anderson The historical beginning of biomimicry is credited to Swiss engineer Georges de Mestral. He was curious about the cockleburs all over his clothes and his dogs fur after hunting expeditions. These cockleburs were his inspiration for his invention of Velcro in 1948.
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This note was uploaded on 02/10/2010 for the course ENGRI 1110 at Cornell University (Engineering School).

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ENGRI1110_Lect28_Nov4_posted - Umbach Office Hours:...

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