what is nano?
DESCRIPTION
What is NANO?. 1 nanometer (nm) = 10 -9 meters (m) ONE BILLIONTH OF A METER!. Atom: ~0.1 nm DNA double helix: ~2 nm wide Protein: ~10 nm long Bacteria: 200 nm Human hair: 100,000 nm wide Paper: 100,000 nm thick Girl 4 feet tall: ~1.2 × 10 9 nm tall - PowerPoint PPT PresentationTRANSCRIPT
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
How do we ‘see’ NANO?
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’!
Atomic Force Microscope(AFM)
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
Basic operation of the AFM
Measures attractive or repulsive forces between a tip and the sample by using a laser to detect lever motion
AFM Tips
http://www.tedpella.com/probes_html/budgetsensors.htm
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
Contact ModeTo get an image, a
sharp tip is scanned across a surface
Tip Size Limitations
Resolutions: X and Y: 2 – 10 nm
Z: 0.05 nm
Z
RAM Memory Chip
CD
Staphylococcus Aureus bacteria
DNA Origami 2.36 nm
0.00 nm
1.0µm
http://www.molbiotech.uni-freiburg.de/km/KM_main.htm
DNA Origami
Nature, 2006, 440, 297-302.
Human chromosome
Polymer stamp
CD