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May 18, 2024, 5:06 am UTC    
October 07, 2001 04:06PM
<HTML>To all
ZK 20 is an artificial zeolite, laboratory produced by this man =
Z.K. Tang, Dept. of Physics, Hong Kong University of Science and
Technology, Clear Water Bay, Hong Kong, PR China. Phone: +852-2358-

ZK-20 is a carbon nanotube.

The nanotubes at NEC are confined inside multiwalled carbon nanotubes.
They have diameters corresponding to a C20 dodecahedron with a single
carbon atom at each of its 20 apices. At this scale the nanotubes don't have the
option the bigger nanotubes have of being either metallic or semiconducting,
depending on their diameter and helicity. The tiniest tubes are always metallic.
The 4 angstrom tubes were found in cathodic deposits produced by arc-
discharge of graphite rods in a hydrogen atmosphere without a metallic
catalyst. More carbon nanotubes (all multiwalled) are kept open in this process
as hydrogen etches away the capping atoms. This maintains the necessary
environment for smaller carbon nanotubes to form. The smallest tubes are
sometimes capped and have an antichiral armchair structure. They seem to
grow out of half of a C20 dodecahedron in which the carbon-to-carbon bonding
angle (108 degrees) is very close to the bonding angle in the configuration of
diamond.
The half shell grows into a full nanotube through a step-by-step mechanism
on both the outer and inner surface. The hydrogen atmosphere helps form the
halves, stabilizing the structure by terminating some dangling bonds with
<a href="[www.google.com] Here</a></HTML>
Subject Author Posted

Ammonia production, by noname

sandy October 06, 2001 07:00PM

Sandy Ammonia

Anthony October 07, 2001 07:26AM

Complex web

sandy October 07, 2001 11:52AM

Re: Sandy Ammonia

sandy October 07, 2001 12:02PM

No apology required

Anthony October 07, 2001 12:16PM

Re: No apology required

sandy October 07, 2001 12:53PM

Re: No apology required

sandy October 07, 2001 12:57PM

Re: No apology required

Anthony October 07, 2001 12:59PM

Re: No apology required

sandy October 07, 2001 01:12PM

Multiple blocks

Anthony October 07, 2001 01:34PM

Got it

sandy October 07, 2001 04:06PM

Re: Got it

sandy October 07, 2001 04:28PM

Very sorry, don't got it then

sandy October 07, 2001 04:40PM

Re: Very sorry, don't got it then

Litz October 08, 2001 11:59AM

Re: Sandy Ammonia

Litz October 08, 2001 11:53AM

Re: Sandy Ammonia

Anthony October 08, 2001 12:21PM

Re: Sandy Ammonia

sandy October 09, 2001 05:56AM

Re: Ammonia production, by noname

Anthony October 08, 2001 12:31PM

Reference

Anthony October 08, 2001 12:33PM

The game is afoot...

Anthony October 08, 2001 12:48PM

Re: Ammonia production, by noname

Frank Doernenburg October 08, 2001 01:08PM

Re: Ammonia production, by noname

Anthony October 08, 2001 01:10PM

Re: Ammonia production, by noname

Frank Doernenburg October 08, 2001 01:43PM

Re: Ammonia production, by noname

Frank Doernenburg October 08, 2001 01:53PM

Re: Ammonia production, by noname

Anthony October 08, 2001 02:21PM

Correction..

Anthony October 08, 2001 02:28PM

Re: Correction repealed

Anthony October 08, 2001 02:30PM

Re: Correction repealed

Frank Doernenburg October 08, 2001 03:06PM

Re: Correction..

Litz October 08, 2001 11:37PM

Re: Kaolin

al-Urman October 08, 2001 03:56PM

Hold up a minute, Frank...

Anthony October 08, 2001 02:43PM

Re: Hold up a minute, Frank...

Frank Doernenburg October 08, 2001 02:55PM

Re: Hold up a minute, Frank...

Anthony October 08, 2001 03:02PM

Re: Hold up a minute, Frank...

Frank Doernenburg October 08, 2001 03:41PM

Re: Hold up a minute, Frank...

Anthony October 08, 2001 03:45PM

Re: Hold up a minute, Frank...

Frank Doernenburg October 08, 2001 04:03PM

Re: Hold up a minute, Frank...

Archae Solenhofen October 09, 2001 12:02AM

Re: Hold up a minute, Frank...

Frank Doernenburg October 09, 2001 04:07AM

Re: Hold up a minute, Frank...

Archae Solenhofen October 09, 2001 02:55PM

Re: Hold up a minute, Frank...

Litz October 09, 2001 12:39AM

Re: Canals maybe?

al-Urman October 08, 2001 03:52PM

Re: Canals maybe?

Anthony October 08, 2001 04:03PM

Re: Canals maybe?

al-Urman October 08, 2001 04:08PM

Re: Canals maybe?

Anthony October 08, 2001 04:30PM

Re: Canals maybe?

Frank Doernenburg October 08, 2001 04:12PM

Re: Canals maybe?

al-Urman October 08, 2001 04:19PM

Re: Canals maybe?

Frank Doernenburg October 08, 2001 04:37PM

Re: Canals maybe?

al-Urman October 08, 2001 11:06PM

Re: Canals maybe?

Litz October 09, 2001 01:13AM

Re: Canals maybe?

Frank Doernenburg October 09, 2001 04:19AM

Re: Canals maybe?

al-Urman October 09, 2001 05:01AM

&quot;L&quot; is for limestone????

Anthony October 09, 2001 06:11AM

Re: Really?

Litz October 09, 2001 05:40AM

Re: Really?

al-Urman October 09, 2001 09:35AM

Oh, Al-Urman......

Anthony October 09, 2001 10:31AM

Re: Oh, Al-Urman......

Frank Doernenburg October 09, 2001 03:52PM

Re: Oh, Al-Urman......

al-Urman October 09, 2001 04:11PM

Re: Oh, Al-Urman......

Frank Doernenburg October 09, 2001 04:34PM

Now, Frank...

Anthony October 09, 2001 05:36PM

Re: Now, Frank...

Frank Doernenburg October 09, 2001 05:45PM

Re: Touche!

al-Urman October 09, 2001 10:19PM

Re: Oh, Al-Urman......

Litz October 10, 2001 03:18PM

Re: Oh, Al-Urman......

Frank Doernenburg October 10, 2001 06:08PM

Re: Oh, Al-Urman......

Litz October 11, 2001 10:39AM

Additionally...

Anthony October 11, 2001 05:07PM

Re: Oh, Al-Urman......

Frank Doernenburg October 12, 2001 04:36AM

Re: Canals maybe?

sandy October 09, 2001 05:59AM

Question for anybody...

Anthony October 08, 2001 02:51PM

Re: Question for anybody...

Greg Reeder October 08, 2001 03:30PM

Frank... need your help!

Anthony October 08, 2001 03:38PM

Re: Frank... need your help!

Anthony October 08, 2001 03:40PM

Re: Frank... need your help!

Litz October 09, 2001 01:53AM



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