Talk:Allotropes of carbon

message: There are a lot of information in foreign languages that there are ...=C=C=C=C=...and ...—C≡C—C≡C—... fibers. How are they called?
—The preceding unsigned comment was added by 195.50.201.235  (talk • contribs) .
:*This is Linear acetylenic carbon Graeme Bartlett (talk) 11:33, 14 November 2013 (UTC)
thread_title: Carbines or something like that

message: In an effort to de-stub the article, I've pretty much made it a list of carbon allotropes with a few paragraphs ripped from their respective articles, but I've kept the comparisons the original contributor made at the bottom. Feel free to discuss any changes or points of contention with me. Jongpil Yun 22:44, 28 January 2006 (UTC)
thread_title:  Major editing 

message: Question regarding this line (under Diamond): "Each carbon atom in diamond is covalently bonded to four other carbons in a tetrahedron."  Even after looking up tetrahedron, I still couldn't tell if this is right.  If each carbon atom is bonded to 4 others, aren't there then 5 atoms total?  Is that still a tetrahedron?  Or are there 4 carbons on each corner and one on the inside like methane? Gaviidae 16:18, 29 October 2006 (UTC)
replies: text: Yes, just like methane, only instead of each hydrogen there's another carbon.  —Ilmari Karonen (talk) 19:27, 29 October 2006 (UTC)
thread_title: tetrahedron

message: Does anyone think that Atomic carbon has a place in this article - it is after all a form of carbon unlike any other? --Quantockgoblin 11:14, 23 February 2007 (UTC)
thread_title:  Atomic carbon? 

message: I've linked this article here. Perhaps someone would like to start a section on this. --Rifleman 82 09:41, 29 October 2007 (UTC)
thread_title: [[Prismane]]

message: The most stable allotrope of carbon is NOT graphite. It is carbyne; it has smallest heat of combustion  (lower than even that of graphite). I'll look up in tables. However graphite and diamond may transform into each other, carbyne doesn't participate (i.e. reactions are extremely slow). 37.60.16.36 (talk) 03:52, 5 June 2012 (UTC)
thread_title:  Carbyne Is Most Stable 

message: Fullerenes have a distinct property - unlike diamond and graphite, which are exceprtionally nonvolatile (especially for a such nonmetallic element), they are extremely volatile when we compare their molar mass or number of protons in the molecule to their sublimation points. They have narrower band gaps (less than 2 eV) than some allotropes of boron and have similar electrical conductivity at normal temperature. Boron is an intermediate between metals and nonmetals, fullerenes are intermediates between metalloids and good nonmetals (such as diamond, which is also an intermediate, which has many metalloidal properties: extremely high melting point, hardness, density, thermal conductivity). 
95.49.248.238 (talk) 21:25, 13 November 2013 (UTC)
thread_title: Fullerenes

message: Any information on a form called M-Carbon?  If the article at http://news.yale.edu/2012/07/19/diamond-rough-half-century-puzzle-solved is correct, some of the comments on diamond are now incorrect (apparently the new form can damage diamond).
Link to better article: http://www.nature.com/srep/2012/120719/srep00520/full/srep00520.html  — Preceding unsigned comment added by 76.195.223.211 (talk) 00:10, 23 July 2012 (UTC)
thread_title:  M-carbon 

message: Some of the more metallic allotropes are: metallic nanotubes, graphene, graphite, glassy carbon, less metallic - diamond, carbyne, fullerenes.
Text about predicted "metallic carbon crystal" at STP (what should be its band structure)?
http://www.kurzweilai.net/metallic-3d-carbon-discovered
http://www.pnas.org/content/early/2013/10/31/1311028110
About other "metallic carbon":
Metallic Carbon Materials
IB-1180
http://www.lbl.gov/tt/techs/lbnl1180.html
Alex Zettl, Vincent Crespi, Marvin Cohen and Steven Louie from Berkeley Lab have introduced heptagons and pentagons into a hexagonal, semimetallic, graphite network, and obtained metallic, strong, covalently-bonded materials of pure carbon. This new invention allows the formation of metallic, pure carbon films and bulk materials, some of which are predicted to be superconductors.
The new metallic carbon materials have improved metallic properties that will work well in any application that presently uses graphite. In addition, these light-weight, metallic materials are extremely strong in the planar directions. They can be used when a mechanically strong and/or metallic film is required. They can be used in field emitters and electromagnetic shielding; in thin film resistors, heaters, radiation detectors and interconnects in devices; high strength conductive fibers; high temperature electrical components; battery electrodes and lubricants.''
Is any form of pure carbon superconductor at ambient pressure?
And carbon looks generally more metallic than popurarily classified as a metalloid selenium. Very high sublimation, boiling and melting point of many forms of carbon (which is inadequate to nonmetls, but adequate to metalloids) is one of the arguments. Even "nonmetallic" diamond is better of all metals in some clssifications popurarily associated with metals. But these two elements are in fact very similar in the general metallic character and have to be classified in the same metallicity class.
79.191.62.193 (talk) 08:58, 16 November 2013 (UTC)
thread_title:  Metallic allotropes 

message: penta-graphene discovered. Any place I can stick this in this article?Septagram (talk) 18:33, 5 February 2015 (UTC)
replies: text: It's not discovered, just a computer model. More advanced than a drawing. There are hundreds of unimportant allotropes of carbon proposed.  When someone actually makes it, then it will be worthy of this article. Graeme Bartlett (talk) 10:37, 11 June 2017 (UTC)
thread_title:  Penta-graphene discovered. Any place I can stick this? 

message: published in november 2019, according to sciencemag.org there seems to be a recently new U-Carbon discoverey   — Preceding unsigned comment added by Suggestednickname (talk • contribs) 13:34, 19 November 2019 (UTC)
thread_title:  U-carbon 

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replies: text: link removed as the archive is hijacked by an ad. Graeme Bartlett (talk) 01:36, 3 July 2017 (UTC)
thread_title:  External links modified 

message: There appears to be a spelling mistake in the first paragraph.  — Preceding unsigned comment added by 79.68.120.106 (talk) 03:18, 31 August 2017 (UTC)
thread_title:  hypotetical? 

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thread_title:  External links modified 

message: The section Allotropes_of_carbon#Schwarzites currently says
"The possibility of schwarzites was identified in the ... The team that first created them did not recognize them as such."
Can a knowledgeable person fix this? thx - 189.122.52.73 (talk) 19:58, 5 September 2018 (UTC)
replies: text: I checked the revision history of this article, and the edit in question was made on Aug.15 by user Lfstevens. I have placed a message on that user's talk page. Dirac66 (talk) 20:55, 5 September 2018 (UTC)
thread_title:  section [[Allotropes_of_carbon#Schwarzites]] - apparently something was left half-edited 

message: Why is allotrope of carbon used as gas mask 102.89.3.57 (talk) 04:33, 18 May 2022 (UTC)
thread_title:  Chemistry 

message: c 197.239.13.1 (talk) 09:06, 7 September 2023 (UTC)
thread_title:  Carbon in the environment  

message: Carbon in the environment 197.239.15.1 (talk) 09:07, 7 September 2023 (UTC)
replies: text: Mostly this is in the form of carbon compounds, rather than pure carbon. Also you can look at geochemistry of carbon or carbon dioxide in Earth's atmosphere. Graeme Bartlett (talk) 22:02, 7 September 2023 (UTC)
thread_title:  Chemistry