Re: The Nanogirl News~

From: Gina Miller (nanogirl@halcyon.com)
Date: Tue May 27 2003 - 15:24:26 MDT

  • Next message: Robert J. Bradbury: "POLITICS & SPACE: Asian developments"

    If you do a search (for nanotube) of the Nanogirl news there are 77 results
    here:
    http://groups.yahoo.com/group/nanogirlnews/messagesearch?query=nanotube
    Just click the links to find out who's doing what with nanotubes. Use your
    edit,
    find to type in nanotubes and get to the nanotube news item in the
    collection.
    The above goes back to 2000. If you want to go even further back go here,
    http://groups.yahoo.com/group/nanotech/messagesearch?query=nanotube
    however this search will yield more than just news, but discussion on
    nanotubes
    as well.

    Gina Miller`

    > On Mon, 26 May 2003, Brett Paatsch wrote:
    >
    > > Robert, it is my understanding that there are still some severe limits
    > > on the length to which nanotubes can be produced, any idea of what
    > > this might be at present and what the limiting factor(s) are in
    producing
    > > these to longer lengths?
    >
    > It is my impression that there are now companies claiming they are
    > up to milli-meter (mm) lengths (whereas before I think we were talking
    > sub-micro-meter (mu-m) lengths. Gina might know more.
    >
    > With something like 40+ companies working on the problems (growing
    > longer tubes, larger volumes, decreased costs) there has to be
    > some progress in these areas.
    >
    > > Also, when it comes to nanotubes as potential hollow containers or
    > > short "pipes" what sorts of hollow diametres have been produced?
    >
    > I believe that we are talking a range of diameters in the 10's of nm.
    > I'm reasonably sure that a group at Berkeley demonstrated a tube
    > within a tube (a structure which could be used as a molecular bearing).
    >
    > > do you know offhand if say a double strand of dna could be
    > > contained in the hollow within a constructible nanotube?
    >
    > I am reasonably certain one could package DNA within an intermediate
    > diameter nanotube. The diameters of the smallest nanotubes might
    > make things a bit tight. Now how you get the DNA *into* or out of
    > the tube -- that's something I think you would have to talk to
    > Siegfried & Roy about.
    >
    > Interestingly I believe as one decreases the diameter of nanotubes
    > one increases the stress on the covalent bonds (i.e. they are at
    > angles they do not "prefer"). This is a very specific problem
    > for the construction of some types of nanotech "diamondoid" materials
    > and is discussed in Nanosystems and I think to a lesser extent
    > briefly in Nanomedicine. But it is *not* a new problem to organic
    > chemistry (Google on "synthesis of cubane",
    > e.g. http://www.chem.ox.ac.uk/dhtml/default.html
    > for example).
    >
    > Robert
    >
    >



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