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High resolution MALDI MS in combination with solvent free sample preparation was employed to characterize a petroleum pitch and a coal tar pitch. The elemental formulas of thousands of mass spectrometric peaks were assigned according to the accurate masses. Large polycyclic aromatic hydrocarbons (LPAHs) were found to be the major components in the complex mixtures. Iso-abundance plots were introduced...
Graphite particles were treated in a nitrogen radio frequency-plasma (RF-plasma) at different excitation power. The morphological as well as chemical surface modifications were investigated by Raman spectroscopy, SEM, and XPS. Changes of the sp2/sp3 bonding ratio and selective surface terminations by functional groups were achieved. Especially, a direct functionalization of the graphites with nitrile...
The separation of petroleum pitch into its oligomeric fractions via dense-gas extraction (DGE), followed by the application of both new and conventional analytical techniques to those fractions, has given us unique capabilities for identifying both the specific molecular structures that exist in petroleum pitches and their concentration. Specifically, pitch fractions containing 98% monomer or 97%...
The search for materials aimed at energy storage has prompted the synthesis of new materials which were obtained by pyrolysis of aromatic precursors under controlled conditions for the production of carbon based structurally disordered networks aimed at hydrogen or lithium storage. Obviously these materials consist of fully insoluble mixtures of different molecular species which escape the traditional...
Here we present a new approach towards extremely large polycyclic aromatic hydrocarbons (PAHs), which uses smooth ambient-temperature cyclodehydrogenation conditions of oligophenylenes in contrast to conventional pyrolytic fusion methods. Vapor-deposition of these structurally well-defined, large arenes leads to supramolecular, space filling arrangements as revealed by scanning tunneling microscopy...
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