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Investigating the small It is necessary for scientists to make observations in their daily work. But what if their research occurs on a scale that is not visible to the naked eye? This presentation will introduce you to four instruments which aid scientists for this type of research.
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Nanospectrometer How it works: This instrument uses light interference maxima and minima to measure thicknesses.
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It looks like this..
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Inner workings
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Resolution, size, and cost Resolution is on the order of 10^-10 (Angstroms) Fits on a table top Approximately $10K
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Scanning Electron Microscope How it works: An electron beam scans over a sample that creates various signals made of emitted electrons off the surface. This allows for an image to form and magnifies the specimen.
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It looks like this..
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Inner workings
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Images produced by SEM
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Silicon Valley Ant
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Blood cell
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Resolution, size, and cost Features observed on an SEM are as small as 1-50 nanometers The size of the instrument itself is about 3x5 ft. Expect to pay between $100K-$300K for this instrument
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Atomic Force Microscope How it works: A sharp tip touches a sample and forces between the atoms in the sample affect a lever on the tip. This creates a topographical map image for the user.
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It looks like this..
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Inner workings of AFM
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Image produced by AFM (Chromium)
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Resolution, size, and cost Vertically, this instrument can “see” down to 0.1 x 10^-10 meters! Laterally, it can “see” 1 nanometer. The AFM fits on a table top This instrument can be obtained at $65K- $200K
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Optical microscope You have probably used this instrument before. White light is used to illuminate a sample and lenses magnify the sample.
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You’ve probably seen it before..
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Inner workings
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Resolution, size, and cost Microscopes, like the name implies, “see” down to 0.2 micrometers. The size ranges from pocket size to a large table top $5-$5K
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Images used 1. Ant. www.sciencemuseum.org.uk/.../section4/sem.asp 2. Termite. alfa.ist.utl.pt/~cvrm/ staff/vramos/SIP05.html 3. Blood cell. history.nasa.gov/ SP-368/s3ch3.htm 4. SEM Diagram. www.weizmann.ac.il/ home/garty/scanning_electr... 5. SEM. darkwing.uoregon.edu/ ~oimb/equip.htm 6. http://www.sciencemuseum.org.uk/on-line/electron/images/ant.jpg http://www.sciencemuseum.org.uk/on-line/electron/images/ant.jpg 7. AFM Diagram. http://www.almaden.ibm.com/vis/models/images/afm.gifhttp://www.almaden.ibm.com/vis/models/images/afm.gif 8. AFM pic. www1.cems.umn.edu/research/ frisbie/Dimension3... 9. chromium dots. http://physics.nist.gov/Divisions/Div841/Gp3/Projects/Atom/images/nanodots.gifhttp://physics.nist.gov/Divisions/Div841/Gp3/Projects/Atom/images/nanodots.gif 10. light microscope. http://www.cas.muohio.edu/~mbi-ws/microscopes/images/LightMicroscope.GIFhttp://www.cas.muohio.edu/~mbi-ws/microscopes/images/LightMicroscope.GIF 11. Nanospectrometer. http://www.thtlab.t.u-tokyo.ac.jp/MEMS_Equipment/NanoSpec.jpghttp://www.thtlab.t.u-tokyo.ac.jp/MEMS_Equipment/NanoSpec.jpg 12. plant cell. www.biologie.uni-hamburg.de/ b-online/e04/04a.htm 13. thin film colors. http://electron9.phys.utk.edu/phys136d/modules/m9/images/colors.jpghttp://electron9.phys.utk.edu/phys136d/modules/m9/images/colors.jpg I14.nterference diagram. newton.ex.ac.uk/.../ images/thin_film1.jpg
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