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Thread: An Introduction to Carbon Nanotubes

  1. #1 An Introduction to Carbon Nanotubes 
    Stargazer Fogo's Avatar
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    Hi everyone,

    I joined recently and I'd like to share some things I've written with you. I think they might be of interest to some people.


    This is a presentation on carbon nanotubes that I made three years ago. They are fascinating things. The presentation should suffice to give a good overview of nanotubes. If you want to make any corrections, comments, or additions just tell me and I'll make some changes. Three years ago I asked to visit the Cambridge nanotube lab but the professor was away at conferences - I might ask again sometime soon

    The best way to view the presentation is to start the slide show from the beginning and click through it (rather than reading it in the editing mode because some of the pictures overlap and there are videos).


    Here it is: CARBON NANOTUBES2X.pptx


    We are all in the gutter, but some of us are looking at the stars.
    ~Wilde
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  3. #2  
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    Hey, guys. I was looking up for facts about CNTs, and I came across a thought in the process.

    Why are CNTs fire-retardant, while charcoal isn't?


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  4. #3  
    Forum Cosmic Wizard
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    Quote Originally Posted by caliber50 View Post
    Hey, guys. I was looking up for facts about CNTs, and I came across a thought in the process.

    Why are CNTs fire-retardant, while charcoal isn't?
    The nanotubes are being added to plastics to form a reinforcing network. As plastics melt in a fire they start to produce gas bubbles under their surfaces. These bubbles expand and break the surface of the pastic. Since the gas bubbles burn as fuel at the surface they increase the rate the plastics burn at.
    Nanotubes can stop them from beaking the surface of the plastic open which helps the plastic to form a layer of charred material. The char layer acts like a heatshield and as it is already burnt itself it does not add fuel to the fire. As a result the char layer reduces the rate of flame spread and the rate of burning of the rest of the plastic.

    Carbon particles dont hold the surface layer together well enough to do this.
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