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    Wyświetlanie 1-4 z 4
    Tytuł:
    Spatial Localized Single Quantum Heteronuclear Polarization Transfer
    Autorzy:
    Demco, D. E.
    Ardelean, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931634.pdf
    Data publikacji:
    1994-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.70.Fz
    33.35.-q
    76.70.-r
    Opis:
    The existence of a strong spatial localization for the efficiency of cross-polarization by single quantum transition in the presence of a main field gradient was evidenced . The case of the solids with strong dipolar interactions has been analyzed. The slice profile of the transferred polarization was evaluated for different cross-polarization procedures. The spatial localization is superior as compared with the spin-locking slice selection method.
    Źródło:
    Acta Physica Polonica A; 1994, 86, 3; 407-425
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spatial Localized Double-Quantum NMR Heteronuclear Coherence Transfer in Solids by Indirect Detection
    Autorzy:
    Demco, D. E.
    Ardelean, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1945433.pdf
    Data publikacji:
    1996-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.70.-r
    76.70.Fz
    33.35.-q
    Opis:
    The spatial localization of the double-quantum NMR heteronuclear coherence transfer in solids, in the presence of a main magnetic field gradient is analyzed. The indirect detection procedure by which the dipolar order of the abundant spin system with I=1/2 is transferred to the double-quantum coherence of the quadrupole nucleus with S=1 and back to the I-spin dipolar order is considered. The slice profile and the cross-relaxation rates are evaluated as a function of the experimental parameters and the sample relevant NMR quantities. The possibility to use this slice selective procedure for imaging and volume localized spectroscopy of quadrupole nuclei in high magnetic fields is discussed.
    Źródło:
    Acta Physica Polonica A; 1996, 89, 5-6; 699-714
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Intermolecular Effects of Fluorocarbons on MC800 Asphaltene and their Characterization
    Autorzy:
    Kirimli, H.
    Ovalioglu, H.
    Akay, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030284.pdf
    Data publikacji:
    2017-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.70.Fz
    83.80.Hj
    68.37.Hk
    61.72.Ff
    Opis:
    Nuclear magnetic resonance and dynamic nuclear polarization experiments were performed to study suspensions of asphaltene in the fluorocarbons at a low magnetic field of 1.53 mT, at room temperature. The asphaltene was extracted from MC800 liquid asphalt, which was of Heavy Iran origin. The elemental composition and the surface morphology of the asphaltene were determined by scanning electron microscopy and energy dispersive X-ray analysis. Intermolecular spin-spin interactions occur between nuclear spins of hydrogen in the solvent medium and the free electron spins in the asphaltene micelles. The electron paramagnetic resonance spectrum of the asphaltene was obtained and the saturation experiments were applied to the samples prepared in vacuum. The main ¹H DNP parameters were listed. Chemical composition and molecular structure of the asphaltene were analyzed. Scanning electron microscope images have shown that asphaltenes are constituted of agglomerated particles and smooth surfaces. Energy dispersive X-ray analysis has shown that the most abundant element is carbon.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 3; 336-338
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Intermolecular Magnetic Spin-Spin Interaction in Asphaltene Suspensions at 1.53 mT
    Autorzy:
    Ovalioglu, H.
    Kirimli, H.
    Akay, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398790.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.70.Fz
    82.56.-b
    83.80.Hj
    68.37.Hk
    Opis:
    In this study, Overhauser effect (OE) type of dynamic nuclear polarization (DNP) experiments were performed to study suspensions of MC800 asphaltene in bromopentafluorobenzene, chloropentafluorobenzene and hexafluorobenzene aromatic solvents. The experiments were performed at a low field of 1.53 mT in a double-resonance nuclear magnetic resonance (NMR) spectrometer. In this technique the nuclei of diffusing solvent molecules and the unpaired electron existing on the asphaltene micelles interact magnetically. The DNP parameters were determined. Additionally, the interactions between ¹⁹F nuclei of the solvent and the electrons delocalized on the asphaltene are interpreted. The highest enhancement factor value (5.90) was obtained for the hexafluorobenzene solvent medium, because between these, hexafluorobenzene has the highest fluorine atom number. The solvent molecules attach to the colloidal asphaltene particles for a very short time forming complexes and making scalar interaction. Morphologies of asphaltene surfaces depending on the solvent effects were observed by using scanning electron microscopy (SEM).
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 806-809
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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