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Snowflake Final 07 Aug08 Mk
 

Snowflake Final 07 Aug08 Mk

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A Powerpoint presentation for the Nanoscience Snowflake program on NISEnet.org

A Powerpoint presentation for the Nanoscience Snowflake program on NISEnet.org

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    Snowflake Final 07 Aug08 Mk Snowflake Final 07 Aug08 Mk Presentation Transcript

    • SNOWFLAKES Nano at its coolest!
    • What do you know about snow?
    • What do you wonder about snow?
    • Outline
      • When does it snow?
      • Why do snowflakes have six sides?
      • Is every snowflake different?
    • When does it snow?
    • It snows when…
      • It’s cold (below freezing)
      • It’s cloudy (water vapor in the air)
    •  
    •  
    • Why do snowflakes have six sides?
    • Nano is very, very small
      • A nanometer is a billionth of a meter.
      • Molecules are nanometers across.
    • Snowflakes are nano!
      • Nanoscience is nature and technology.
      • Water molecules form ice crystals .
    • Shape is determined by molecular structure Basic shapes of snowflakes Molecular structure of ice crystals
    • Is every snowflake different?
    • Snowflakes have many shapes
    • Type depends on temperature and humidity
    •  
    •  
    •  
    •  
    • Snowflakes self-assemble
      • Molecules and cells form themselves into structures …
      • … under the right conditions, with the right raw materials.
    • Snowflakes and nano, in the future New ways to build tiny, nano-sized structures
    • Snowflakes and nano, right now! Ice crystals self-assemble inside the museum
    • Review
      • When does it snow?
        • Cold, cloudy conditions
      • Why do snowflakes have six sides?
        • Molecular structure of ice crystals
      • Is every snowflake different?
        • Temperature and humidity
    • Image sources Courtesy of Kenneth Libbrecht, www.snowcrystals.com
    • Image sources (continued) iStockphoto.com Courtesy of NOAA National Weather Service Collection Courtesy of NASA Marshall Space Flight Center Courtesy of IBM
    • This project was supported by the National Science Foundation under Grant No. ESI-0532536. Any opinions, findings, and conclusions or recommendations are those of the author and do not necessarily reflect the views of the Foundation.