Authors:P. Byszewski, E. Kowalska, and R. Diduszko
Iron in the fullerite lattice binds fullerences in a sandwich type C60FeC60 complexes. At the concentration C60Fe2 it crystallizes in the monoclinic lattice. The structure is thermally unstable, with the energy release of 606 kJ·mol−1 it returns to fee lattice. Two possible sites in the reconstructed fee lattice are discussed, Fe bond to C60 and Fe inside the C60 cage.
Authors:P. Byszewski, E. Kowalska, and R. Diduszko
Fullerences C60 with adamantane (C10H16), hexamethylotetramine (HMT, C6H12N4) or 1,4-diazabicyclooctane (DABCO, C6H12N2) crystallize, at the relative concentration C60/guest=2/1, in the pseudotetragonal lattice in which C60 retains almost the same positions as in pure fullerides. The ‘guest’ molecules occupy the octahedral interstitial sites.
The mixed crystals which exhibit interesting physical properties are thermally unstable. The decomposition starts at 40–50°C.
Authors:E. Kowalska, P. Byszewski, R. Diduszko, A. Huczko, and J. Mieczkowski
The crystalline solvates containing fullerenes and (di)methylnaphthalenes were investigated by thermal analyses and X-ray
diffraction methods. It was found that C60 with (di)methylnaphthalenes forms two types of stable solvates: either at the molar ratio 1:2 decomposing at temperatures
close to 100C or at 1:1 molar ratio decomposing in the temperature range 120–214C. Crystalline lattice and thermal stability
of the solvates depends on the structure of the solvent molecules. The strong solute-solvent interaction is also manifested
by the modification of the C60 absorption spectra in solution. The results are discussed using semiempirical quantum chemistry methods.
Authors:S. Biniak, R. Diduszko, W. Gac, M. Pakuła, and A. Świątkowski
A commercial Pd/activated carbon catalyst (10%) was treated using several redox processes: reduction with gaseous hydrogen
at 140 °C, reduction by negative electrochemical polarization in acidic and basic environments, oxidation with aqueous hydrogen
peroxide, and positive electrochemical polarization in acidic and basic environments. To establish the electrochemical reduction/oxidation
conditions, the potentials of hydrogen and oxygen evolution at Pd/AC powder electrodes were determined from cyclic voltammetric
(CV) measurements. The samples were examined for the presence of palladium oxide phases on dispersed metal particles using
XRD, TPR, and TPD. The metal oxide phase disappeared following hydrogen and electrochemical reduction. Oxidative treatment
of the commercial catalyst differentiated the palladium oxide layers on the metal particle surface. Changes in the surface
chemistry of the Pd/PdO/AC system were confirmed by the electrochemical behavior of electrodes prepared from the carbon samples.
Authors:P. Byszewski, E. Kowalska, R. Diduszko, R. Aleksiyko, M. Berkowski, J. Fink-Finowicki, and J. Kapuśniak
The solid solution crystals, La1–xNdxGaO3 and La1–xPrxGaO3 have been studied by differential scanning calorimetry method; the crystals exhibit the first order phase transition, the
temperature of the transition linearly increases with the concentration of Pr or Nd. The structure of the crystals has been
determined by X-ray diffraction. The correlation between the phase transition temperature and crystalline structure at the
temperature of the phase transition in both solid solution families is discussed.
Authors:E. Kowalska, P. Byszewski, M. Popławska, L. Gładczuk, J. Suwalski, R. Diduszko, and J. Radomska
Properties of FeC60 solid samples were investigated by X-ray diffraction, 57Fe Mssbauer spectroscopy and magnetic measurements in order to examine interaction of iron with fullerene. FeC60 samples were prepared by decomposition of adduct based on the fullerene and ferrocene derivative. The samples exhibited superparamagnetic
properties originating from an interaction between FeC60 complexes within nanoparticles. Each nanoparticle consisted of hundreds to thousands complexes. The results of experiments
are compared with theoretical studies using PM3 method based on the Neglect of Diatomic Differential Overlap approximation.
Authors:E. Kowalska, J. Radomska, P. Konarski, R. Diduszko, J. Oszczudłowski, T. Opalińska, M. Więch, and Z. Duszyc
of electronic wastes (sample A – a mixture of three types of printed
circuit boards, sample B – a mixture of electronic junctions with metal
wires) were investigated using thermogravimetric analysis (TG). Thermogravimetric
and derivative thermogravimetric data (TG and DTG) give information on the
thermal stability of A and B samples and allows finding the correct conditions
for their degradation using pyrolysis in an experimental system, built on
the laboratory scale for utilization of hazardous wastes. X-ray fluorescence
measurements prove that brominated flame retardant is present in sample A,
whilst chlorinated flame retardant is a probable component of sample B. Preliminary
liquid chromatography of oil products obtained as a result of thermal waste
degradation shows that the hydrocarbons released during pyrolysis could be
used as a fuel.