ELFT HÍRADÓ

[tcsaba <tcsaba AT eik.bme.hu>]

                 M E G H Í V Ó - I N V I T A T I O N

    Seminar Series of the Department of Theoretical Physics at the
           Budapest University of Technology and Economics


                          Sándor Pekker
              (Wigner Research Centre for Physics)

            Exotic Fullerene-Cubane Materials: From
      Rotor-Stator Cocrystals to Ultrahard Amorphous Solids


A Chineese research group found recently two new phases in our 
previously prepared fullerene-cubane system after a high-pressure 
treatment: (i) a crystalline material of amorphous constituents; and 
(ii) an extended amorphous solid, harder than diamond. Phase (i) has 
been addressed as a new type of partially disordered solids, but its 
microscopic structure has not been specified. The new materials complete 
the rich family of fullerene-cubane materials consisting of such exotic 
phases as recognition controlled cocrystals with rotor-stator dynamics, 
rotor-in-rotor materials and interpenetrating networks of percolating 
copolymers. In the first part of the talk I outline the general 
structural characteristics of fullerenes, which are responsible for the 
great variety of their solid state reactions and the propensity for the 
formation of disordered solid derivatives. Then I discuss the polymers 
and cocrystals of fullerenes stressing the role of static and dynamic 
disorder. I detail the rotor-stator properties and the thermal 
copolymerization of various fullerene-cubane cocrystals. Finally I 
suggest a preliminary molecular model for the structure of the recently 
found phase (i).


Időpont: 2019. április 12. péntek, 10:15
Helyszín: BME Fizikai Intézet, Elméleti Fizika Tanszék,
Budafoki út 8. F-épület, III lépcsőház, szemináriumi szoba