See also H.6. and nanostructured Pd-based alloys; J Phys: Condens Matter; accepted for publication 22
E. X-RAY DIFFRACTION G. Faigel, F. Borondics # , G. Bortel, B. Botka # , L. Gránásy, A. Jánossy + , Z. Jurek, K. Kamarás, G. Klupp, É. Kováts, L. Környei # , K. Németh # , G. Oszlányi, Á. Pekker # , S. Pekker, T. Pusztai, Z. Szekrényes # , Gy. Tóth # , G. Tegze, M. Tegze Fullerenes and related systems. — The fullerenes are closed shell all carbon atom molecules. The most abundant among them is the C 60 molecule. Fullerenes can form a large variety of compounds with elements or with other molecules. In the group of A x C 60 compounds (A=Na, K, Rb, Cs) there are materials with very interesting properties. Many superconducting materials (A 3 C 60 ), and also polymers with different dimensionality (RbC 60 , Na 4 C 60 ) were found. Beside the fullerene-metal compounds there are molecular crystals formed by fullerenes and various other molecules. A family among them is the Cubane-fullerene type molecular crystals. Similarly to fullerenes cubane (C 8 H 8 ) is also a cage-molecule. The two types of molecules form crystals as a result of molecular recognition between the convex surface of fullerenes and the concave cubane. Static cubane occupies the octahedral voids of the face centered cubic structures and acts as a bearing between the rotating fullerene molecules. Our group studied these two types of fullerene based materials. We have investigated the alkali fulleride materials by infrared spectroscopy and determined the spectra in the dynamic Jahn-Teller state of the divalent and tetravalent fulleride ion. We found that the special movement of the fullerene balls, pseudorotation, overcomes the distorting effect of the cations in solid salts at high enough temperature. We also determined the vibrational properties of cubane-fullerene cocrystals and the products of their copolymerization either by heat or by photons. Based on vibrational (infrared and Raman) spectra and subsequent symmetry analysis, we proposed a linear structure for the copolymers. In connection to fullerene-cubane type materials we investigate two more points, which is of interest: a) the alternating arrays of rotating fullerene and static cubane units give rise to unusual dynamics at ambient temperatures that we called rotor-stator properties, and b) the decomposition of the highly strained cubane induces a topochemical copolymerization of the cocrystals at elevated temperatures. Recent studies suggest that the rotor-stator properties depend on the shapes and sizes of the constituents, and the new materials compose a series of orientational mesomorphic phases in between the orientationally ordered and the plastic cocrystals. In the framework of international collaborations we also performed the copolymerization of the fullerene-cubane materials under photochemical conditions and at high pressures. Like fullerene molecules, carbon nanotubes are also exclusively built from carbon atoms. These nanostructures have many properties, which promise applications in optical, electronic and even biological systems. In order to exploit these properties, one has to characterize these materials. We studied the optical and thermal properties of transparent nanotube films, in their pristine form and modified by chemical functionalization. We found both optical and Raman spectroscopy useful in characterizing the degree of functionalization of these materials. # Ph.D. student + Permanent position: Budapest University of Technology and Economics 23
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entanglement one has to find method
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T.7. T.8. T.9. Asbóth JK, Domokos
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TABLE of CONTENTS PREFACE 1 KEY FIG