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Materialien/Werkstoffe Poster: Do., 13:00–15:30 D-P370
Study of pore structures in shungites by small-angle neutron scattering
Mikhail V. Avdeev 1 , Timur V. Tropin 1 , Victor L. Aksenov 1 , Laszlo Rosta 2 ,
Vasyl M. Garamus 3 , Natalia N. Rozhkova 4
1 Joint Institute for Nuclear Research, Dubna, Russia – 2 Research Institute for Solid
State Physics and Optics, Budapest, Hungary – 3 GKSS Research Center, Geesthacht,
Germany – 4 Institute of Geology, Karelian Research Centre RAS, Petrozavodsk, Russia
Shungites are carbon-rich rocks of Precambrian age widespread over Russian Karelia.
In recent years they have been attracting much attention due to the prospects of their
various industrial and biomedical applications [1]. A special attention to shungites is
connected with the reported [2] presence of fullerenes in them. In the given work the
analysis of the small-angle neutron scattering data for shungites from different deposits
[3] is reported. It is shown that shungites have a complex pore structure at a nanoscale
of 1-100 nm depending on their origin. Along with it, common features, in particular,
two-level organization at the given scale can be observed. The absorption of heavy
water by shungites is used to match the neutron scattering from open pores and to
separate the information about the open and closed porosity in the samples. The revealed
structural units are compared with the previous experimental results obtained
by the complementary techniques. The work has been performed with the ISTCS support,
project 2769.
[1] Buseck PR, Galdobina LP, Kovalevski VV, Rozhkova NN, Valley JW, Zaidenberg
AZ. Canadian Mineralogist 35 (1997) 1363.
[2] Buseck PR, Tsipursky SJ, Hettich R. Science 257 (1992) 215.
[3] Avdeev MV, Tropin TV, Aksenov VL, Rosta L, Garamus VM, Rozhkova NN. Carbon
44 (2006) 954.