Experimental measurement of DOS for nanocarbons: applications to isotopic fractionation processes and interstellar dust behaviour
The project is aimed at experimental investigation of phonon density of states (PDOS) in several types of nanocarbons with emphasis on nanodiamonds and on various types of nanographites. The data obtained in our work will be used to study size effect on carbon reduced isotopic partition function ratio, to calculate thermal capacity of nanocarbons, and to investigate eventual influence of a confinement effect of nanocarbons properties. Two applications of the obtained PDOS are of principal interest: 1) Geosciences: calculation of carbon isotope fractionation factors for nanoparticles and its comparison with results for macroscopic materials (the confinement effect on equilibrium stable isotope fractionation); and 2) Astrophysics: to put constrains on degree of heating of isolated carbonaceous particles in stellar environment by so-called stochastic heating. In addition thermal capacity of nanocarbons will be calculated. This is important for construction of nanostructured plasma-facing blankets in ITER-type reactors. This project will provide unique and pioneering information on size effect on isotopic fractionation.
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SHIRYAEV Andrei; KOZA Michael Marek; KVASHNINA KRISTINA; POLYAKOV Veniamin; Antonio Rivera; ROLS Stephane; SOBOLEV Alexander and WILKE MAX. (2015). Experimental measurement of DOS for nanocarbons: applications to isotopic fractionation processes and interstellar dust behaviour. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-01-410
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