2006/06/04 by Eric Mandell, Mandell, Eric, Nathaniel Hunton +3
Engineering · Materials Science · Physics and Astronomy · #Astrophysics (astro-ph) #Astrophysics and Star Formation Studies #Atomic and Molecular Clusters (physics.atm-clus) #FOS: Physical sciences #Graphene research and applications #Ion-surface interactions and analysis #Materials Science (cond-mat.mtrl-sci) #astro-ph #cond-mat.mtrl-sci #physics.atm-clus
paper · pdf · doi:10.48550/arxiv.cond-mat/0606093
8 pages, 10 figs, 31 refs, RevTeX4 cf. http://www.umsl.edu/~fraundor/isocore.html
arxiv created 2006/06/04 · openalex publication_date 2006/06/04 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Electron 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.