'Tetracarbon', 40 times harder than diamond?

In sci.physics, Bret Cahill

wrote
on 9 Sep 2006 18:54:18 -0700
.com:
Isn't diamond _already_ tetra?


Bret Cahill


http://cst-www.nrl.navy.mil/lattice/struk/a4.html

suggests diamond is an A4 lattice. Take four carbon atoms
in a tetrahedron and add four additional atoms with an
appropriate "kink", then replicate.

The JMOL applet is a good method to see this in quasi-3D.

--
#191,
Windows Vista. Because it's time to refresh your hardware. Trust us.

"Sorcerer" wrote in message
k...

"Bret Cahill" wrote in message
oups.com...
| Isn't diamond _already_ tetra?

Yes.

-hedral, yes, but that's not what the name refers to. If this is about the
Angewandte article that I glanced at last week, I think this is a polymer of
a substituted 1,3-butadiyne, X-CCCC-X. If I remember the article right, it
is a sort of poly(tetracarbon) molecule, by insertion of an alkyne triple
bond into a C-X bond. Again, if I remember right, the structure of the
polymer is an alternating ene-yne-ene-yne structure, so it's less rigid than
the ene-ene-ene structure of polyacetylene, but not as unidimensionsional as
an yne-yne-yne unsubstituted polycarbon linear chain. Besides, I think John
Gladysz did a very nice job of showing that conjugated polyynes (polycarbon)
are very reactive and poorly stable, and a poor choice for a high-strength
material.

Eric Lucas

wrote in message
. com...
|
| "Sorcerer" wrote in message
| k...
|
| "Bret Cahill" wrote in message
| oups.com...
| | Isn't diamond _already_ tetra?
|
| Yes.
|
| -hedral, yes, but that's not what the name refers to. If this is about
the
| Angewandte article that I glanced at last week, I think this is a polymer
of
| a substituted 1,3-butadiyne, X-CCCC-X. If I remember the article right,
it
| is a sort of poly(tetracarbon) molecule, by insertion of an alkyne triple
| bond into a C-X bond. Again, if I remember right, the structure of the
| polymer is an alternating ene-yne-ene-yne structure, so it's less rigid
than
| the ene-ene-ene structure of polyacetylene, but not as unidimensionsional
as
| an yne-yne-yne unsubstituted polycarbon linear chain. Besides, I think
John
| Gladysz did a very nice job of showing that conjugated polyynes
(polycarbon)
| are very reactive and poorly stable, and a poor choice for a high-strength
| material.
|
| Eric Lucas
|
Thanks. At least that explains what the fuss was all about.
So when can I get a leather strop impregnated with it and hone
my razor, taking care not to allow any reaction? I need a shave,
you see.
Androcles

"Sorcerer" wrote in message
k...

Thanks. At least that explains what the fuss was all about.
So when can I get a leather strop impregnated with it and hone
my razor, taking care not to allow any reaction?

Don't hold your breath.


I need a shave,
you see.

:^) Grow a beard. The sleep I've saved since I did has amounted to about
24 hours per year.

Eric Lucas

wrote in message
. com...
|
| "Sorcerer" wrote in message
| k...
|
| Thanks. At least that explains what the fuss was all about.
| So when can I get a leather strop impregnated with it and hone
| my razor, taking care not to allow any reaction?
|
| Don't hold your breath.
|
|
| I need a shave,
| you see.
|
| :^) Grow a beard. The sleep I've saved since I did has amounted to about
| 24 hours per year.
|
| Eric Lucas
Dang... I've been holding my breath for so many years now my
beard has turned white, I figured that was the end of the 5-o'clock shadow
and I could start shaving again... but not until my razor is honed.

Sorcerer wrote:

Thanks. At least that explains what the fuss was all about.
So when can I get a leather strop impregnated with it and hone
my razor, taking care not to allow any reaction? I need a shave,
you see.

Silica already present in cowhide means you don't need,
and really shouldn't use, additional abrasives. It'd be more
useful as a paste for charging buffing wheels.

Actually, what you need is a thin base carrier impregnated
with superfine grit. Maybe 2, 3x finer than my best surgical
black Arkansas. Then use the strop.

wrote:

But since it's industrial diamands that you use
to make stealth titanium,

Nope. We use cubic zirconium, from the QVC Cubic
Zirconium Hour.

"Father Haskell" wrote in message
ups.com...
| Sorcerer wrote:
|
| Thanks. At least that explains what the fuss was all about.
| So when can I get a leather strop impregnated with it and hone
| my razor, taking care not to allow any reaction? I need a shave,
| you see.
|
| Silica already present in cowhide means you don't need,
| and really shouldn't use, additional abrasives. It'd be more
| useful as a paste for charging buffing wheels.
|
| Actually, what you need is a thin base carrier impregnated
| with superfine grit. Maybe 2, 3x finer than my best surgical
| black Arkansas. Then use the strop.

Thanks Dad...
I see you use a thin base substrate sandpaper in place of
carbonpaper... but wouldn't tetracarbonpaper make 40
hard copies of your speeding ticket?

Androcles

Robert Clark wrote:
Polyyne said to be 40 times harder than diamond.
http://www.foresight.org/nanodot/?p=2111

See my reply there. For stabler materials, I don't see much talk about
paracuanojèn derivativs, which must mean that the Groom Lake base is
a'doing mead work on them. By the way, did you know that the Mohs
chart leaves off plumbago for 0? Poluyne must then be -1.

-Aut

"Father Haskell" wrote in message
ups.com...
wrote:
But since it's industrial diamands that you use
to make stealth titanium,

[Fatha]
Nope. We use cubic zirconium, from the QVC Cubic
Zirconium Hour.

[hanson]
Get it right, Fatha! They use pubic circumonium,
from the Circumcision Hour. Here are the details:
http://www.SexuallyMutilatedChild.org/mohel.htm

ahahahaha... ahahahanson