What is NANO?
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Transcript of What is NANO?
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What is NANO?1 nanometer (nm) = 10-9 meters (m)
ONE BILLIONTH OF A METER!
Atom: ~0.1 nmDNA double helix: ~2 nm wideProtein: ~10 nm longBacteria: 200 nmHuman hair: 100,000 nm widePaper: 100,000 nm thickGirl 4 feet tall: ~1.2 × 109 nm tallEmpire State Building: ~3.81 × 1011 nm tall
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How do we ‘see’ NANO?
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How do we ‘see’ NANO?
The smallest object that our eyes can see is the width of a
human hair.
That’s 100,000 nm!
NANO is so small that we need
special instruments to ‘see’!
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Atomic Force Microscope(AFM)
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http://www.nanotech-now.com/Art_Gallery/antonio-siber.htm
~30 mm scan
‘See’ by feeling
1 nm = 10-9 m
mm = micrometer
1 mm = 10-6 m
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Basic operation of the AFM
Measures attractive or repulsive forces between a tip and the sample by using a laser to detect lever motion
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AFM Tips
http://www.tedpella.com/probes_html/budgetsensors.htm
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AFM Tips
http://www.tedpella.com/probes_html/budgetsensors.htm
The tip is roughly 20 µm long, the cantilever is 450 µm in length and20-50 µm wide, and the thickness is usually 3-4 µm thick
450 mm
20 mm
mm = micrometer1 mm = 10-6 m
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Contact ModeTo get an image, a
sharp tip is scanned across a surface
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Tip Size Limitations
Resolutions: X and Y: 2 – 10 nm
Z: 0.05 nm
Z
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RAM Memory Chip
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CD
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Staphylococcus Aureus bacteria
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DNA Origami 2.36 nm
0.00 nm
1.0µm
http://www.molbiotech.uni-freiburg.de/km/KM_main.htm
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DNA Origami
Nature, 2006, 440, 297-302.
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Human chromosome
Polymer stamp
CD