Comments on: Nanomachines, Nanomaterials, and Klm http://metamodern.com/2009/02/20/nanomaterials-for-nanomachines/ The Trajectory of Technology Wed, 09 May 2012 11:03:22 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Mechanochemistry, Mechanosynthesis, and Molecular Machinery http://metamodern.com/2009/02/20/nanomaterials-for-nanomachines/comment-page-1/#comment-1990 Mechanochemistry, Mechanosynthesis, and Molecular Machinery Sun, 01 Nov 2009 03:14:52 +0000 http://metamodern.com/?p=1862#comment-1990 [...] Toward Advanced Nanotechnology: Nanomaterials (5)    Nanomachines, Nanomaterials, and Klm    Subscribe [...] [...] Toward Advanced Nanotechnology: Nanomaterials (5)    Nanomachines, Nanomaterials, and Klm    Subscribe [...]

]]> By: Erin http://metamodern.com/2009/02/20/nanomaterials-for-nanomachines/comment-page-1/#comment-595 Erin Fri, 27 Feb 2009 04:46:48 +0000 http://metamodern.com/?p=1862#comment-595 Thank you for this appreciated insight, Mr Drexler! Question about this: Would such materials be able to fit into the overall category of "diamondoid" even if they do not contain carbon? Some time back I was involved in a discussion about carbyne chains and a related material, cumulene, and the question that arose was this: Could we, using nanomechanisms, assemble stable macroscopic structures from carbyne rods, or not? The consensus seemed to be no, you could not have a stable macroscopic carbyne structure (say a fabric of woven carbyne strands) at room temperature, but, they have great utility in nanoscale mechanisms. Would you say this is basically correct? One reason I bring this up has to do with this article I read some time ago: http://www.shelleys.demon.co.uk/carbon.htm From that article, are they claiming a new form of carbon that rivals even fullerene nanotubes when it comes to strength? One material that greatly interested me was that H6 carbon metal (correct formula?) you mention in Nanosystems. Thank you for this appreciated insight, Mr Drexler! Question about this: Would such materials be able to fit into the overall category of
“diamondoid” even if they do not contain carbon?

Some time back I was involved in a discussion about carbyne chains and a related material, cumulene, and the question that arose was this: Could we, using nanomechanisms, assemble stable macroscopic structures from carbyne rods, or not? The consensus seemed to be no, you could not have a stable macroscopic carbyne structure (say a fabric of woven carbyne strands) at room temperature, but, they have great utility in nanoscale mechanisms. Would you say this is basically correct?

One reason I bring this up has to do with this article I read some time ago: http://www.shelleys.demon.co.uk/carbon.htm

From that article, are they claiming a new form of carbon that rivals even fullerene nanotubes when it comes to strength?

One material that greatly interested me was that H6 carbon metal (correct formula?) you mention in Nanosystems.

]]> By: Eric Drexler http://metamodern.com/2009/02/20/nanomaterials-for-nanomachines/comment-page-1/#comment-591 Eric Drexler Thu, 26 Feb 2009 23:43:03 +0000 http://metamodern.com/?p=1862#comment-591 That’s an interesting reference, but it doesn’t report the discovery of materials with huge improvements, just theoretical calculations that predict 18% and 58% improvements. These improvements are small enough to be plausible, but I’d want to see the basis for the calculations before deciding what to think of them. The materials are both hexagonal-symmetry relatives of more common cubic-symmetry forms; the local bonding is the same in the cubic and hexagonal forms. I wouldn’t expect differences in hardness to be very large. Cubic and hexagonal boron nitride are interesting materials; they resemble the analogous carbon structures (diamond and lonsdaleite) in many ways, yet have quite different chemical behaviors. For example, B–N bonds of this kind (dative bonds) cleave asymmetrically rather than forming unstable radicals. That’s an interesting reference, but it doesn’t report the discovery of materials with huge improvements, just theoretical calculations that predict 18% and 58% improvements. These improvements are small enough to be plausible, but I’d want to see the basis for the calculations before deciding what to think of them. The materials are both hexagonal-symmetry relatives of more common cubic-symmetry forms; the local bonding is the same in the cubic and hexagonal forms. I wouldn’t expect differences in hardness to be very large.

Cubic and hexagonal boron nitride are interesting materials; they resemble the analogous carbon structures (diamond and lonsdaleite) in many ways, yet have quite different chemical behaviors. For example, B–N bonds of this kind (dative bonds) cleave asymmetrically rather than forming unstable radicals.

]]> By: Erin http://metamodern.com/2009/02/20/nanomaterials-for-nanomachines/comment-page-1/#comment-586 Erin Thu, 26 Feb 2009 03:48:54 +0000 http://metamodern.com/?p=1862#comment-586 Research scientists have discovered a material called WURTZITE BORON NITRIDE that is 18 times harder or stress resistant than diamond! Also a carbon material called Londeseite that is 58 times harder or more stress resistant than diamond, I am not so familiar with exactly how the stress tests go, but I find this very interesting. Here is the reference: http://www.newscientist.com/article/dn16610-diamond-no-longer-natures-hardest-material.html Research scientists have discovered a material called WURTZITE BORON NITRIDE that is 18 times harder or stress resistant than diamond! Also a carbon material called Londeseite that is 58 times harder or more stress resistant than diamond, I am not so familiar with exactly how the stress tests go, but I find this very interesting. Here is the reference:

http://www.newscientist.com/article/dn16610-diamond-no-longer-natures-hardest-material.html

]]> By: Making vs. Modeling: A paradox of progress in nanotechnology http://metamodern.com/2009/02/20/nanomaterials-for-nanomachines/comment-page-1/#comment-573 Making vs. Modeling: A paradox of progress in nanotechnology Wed, 25 Feb 2009 09:37:15 +0000 http://metamodern.com/?p=1862#comment-573 [...] Nanomachines, Nanomaterials, and Klm [...] [...] Nanomachines, Nanomaterials, and Klm [...]

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