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What the hell is a graphene? January 18, 2009

Posted by fetzthechemist in PAHs, Speculation, Uncategorized.

OK, I know that graphenes are chewed up bits of graphite, so it was a rhetorical question. But is the term sexier than large PAH?

The structures pictured in the many papers are all large PAH ones. The graphene produced is a mixture of these hypothesized structures. Noboby has done real analysis for them, to characterize if they really are those PAH structures. Excuse me, but mass spectrometry only gives, at best, an empirical carbon and hydrogen formula. IR only does the similar thing of seeing carbon-carbon bond aromaticity and the peripheral types of hydrogens. Those are pretty simple – one to four hydrogens on a ring.

With the techniques I developed, you ought to be able to do large PAHs of ten or twelve rings easily, maybe even fourteen rings. That would be thirty, forty, fifty ring carbons, well into the range people call graphene.

If graphene is that type of material, then other PAH rich material ought to behave similarly. A coal tar pitch could be fractionated by alumina adsorption to yield very large PAHs in a mixture. Simply and cheaply done by the ton (bauxite adsorption is a common industrial technique – that is alumina adsorption chromatography).



1. Dr. Allen W. Hatheway - January 24, 2009

24January, 2009
Dear Fetz: Not knowing a whit about you, I must say that you have the basis for a nice discussion opened-up here, on the premise of long-chain carbon PAHs. Now, recognize that I am a scientist (Professional Geologist) and a Professional Engineer, and that I treat of chemistry only on the basis that it is fundamentally important to my major career orientation specialty; characterization and remediation of uncontrolled “coal-tar” hazardous waste sites. Therein lines my interest in what you so clearly state. That leaves me with a purposeful curiosity of how, when and why six-plus-ring tars might have been formed in the course of coal carbonization activities (manufactured gas, coke-oven gas, coke, and charcoal) and how it might be that their field associations (among many PAH compounds) in the witches’ brew of “coal tar” and how if might be that some of their presence or components might come to be stripped off for human or biological reception, as environmental threats.
My website is dedicated to developing clarity in real issues threatening people and the environment, and how we all may come to better understand and abate those threats.
Yours truly,
Allen W. Hatheway
Rolla, Missouri
PS: Do shoot me your resume; your writing on this “Graphene” subject is tight and seems to reflect a high degree of competence in your subject.

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