Unlayered graphenes in red-giant starsmoke

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dc.creatorMandell, Eric
dc.creatorHunton, Nathaniel
dc.creatorFraundorf, P.
dc.date2006-06-04
dc.date.accessioned2026-07-07T07:12:26Z
dc.date.available2026-07-07T07:12:26Z
dc.descriptionElectron diffraction, imaging, and energy loss provide evidence for unlayered graphene sheets in the core of certain interstellar graphite onions (from the meteorite Murchison) whose isotopes indicate formation in the atmosphere of late-stage asymptotic giant branch stars (like those which nucleo-synthesized much of the earth's carbon). The data are compared to structural models loosely associated with atom-by-atom, molecule-by-molecule, and dendritic-droplet solidification processes. In this context the observed density, diffraction peak-shapes, and edge-on sheet patterns, along with theoretical limits on time for growth in the presence of outgoing radiation pressure, suggest nucleation of hexagonal sheets from pentagons, perhaps from a supercooled melt. These results warrant a closer examination of specimen structure, the energetics of unlayered graphene nucleation, and processes such as jets in late star atmospheres.
dc.description8 pages, 10 figs, 31 refs, RevTeX4 cf. http://www.umsl.edu/~fraundor/isocore.html
dc.identifierhttps://arxiv.org/abs/cond-mat/0606093
dc.identifierhttp://arxiv.org/abs/cond-mat/0606093
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/112076
dc.subjectMaterials Science
dc.subjectAstrophysics
dc.subjectAtomic and Molecular Clusters
dc.titleUnlayered graphenes in red-giant starsmoke
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