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Morozov, E. V.
Probing flocculant-induced asphaltene precipitation via NMR imaging: from model toluene-asphaltene systems to natural crude oils / E. V. Morozov, O. N. Martyanov // Appl. Magn. Reson. - 2016. - Vol. 47, Is. 2. - P. 223-235, DOI 10.1007/s00723-015-0741-9. - Cited References:46. - This research was performed with the financial support of Russian Science Foundation (project no. 15-19-00119). . - ISSN 0937-9347. - ISSN 1613-7507

РУБ Physics, Atomic, Molecular & Chemical + Spectroscopy
Рубрики:
PETROLEUM ASPHALTENES
   MOLECULAR-DYNAMICS
   AGGREGATION
   MICROSCOPY
   SCATTERING
   RESONANCE
   SEDIMENTATION
   ASSOCIATION
   CALORIMETRY
   RELAXATION
Аннотация: An nuclear magnetic resonance (NMR) imaging approach for studying flocculant-induced asphaltene precipitation processes is introduced in this report. Unlike commonly accepted techniques, which primarily measure aggregation processes on the submicron scale (the level of asphaltene molecules and their aggregates), NMR imaging demonstrates the capability to obtain new useful information about bulk system behavior on the macro scale. To reveal the capabilities of the method, the model toluene-asphaltene system and two samples of natural crude oils with different chemical composition and physical properties (such as asphaltene content and density) were employed for experiments. The process of colloidal suspension formation and two different patterns of its evolution were observed depending on both the asphaltene content and the flocculant concentration. In the first pattern, the flocculant-induced precipitation leads to the slow uniform compacting of the suspension and descent of the sedimentation front, whereas the second pattern is characterized by sediment accumulation and the upwards drift of the front. It was found that the behavior of the precipitated asphaltenes in the model system correlates well with those observed in natural crude oils. The results achieved in this work are in agreement with the data obtained previously via other techniques. Thus, NMR imaging proved to be an efficient method for probing flocculant-induced precipitation in crude oils.

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Держатели документа:
Russian Acad Sci, Inst Chem & Chem Technol, Siberian Branch, Akademgorodok 50-24, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Akademgorodok 50-24, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Siberian Branch, Boreskov Inst Catalysis, Pr Ak Lavrentieva 5, Novosibirsk 630090, Russia.
Novosibirsk State Univ, Pirogova St 2, Novosibirsk 630090, Russia.

Доп.точки доступа:
Martyanov, O. N.; Морозов, Евгений Владимирович; Russian Science Foundation [15-19-00119]
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Zharkov, S. M.
Electron-beam-initiated crystallization of iron-carbon films / S. M. Zharkov, L. I. Kveglis // Phys. Solid State. - 2004. - Vol. 46, Is. 5. - P. 969-974, DOI 10.1134/1.1744977. - Cited References: 34 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
AMORPHOUS-GERMANIUM FILMS
   EXPLOSIVE CRYSTALLIZATION
   PATTERN-FORMATION
   TEMPERATURE
   MICROSCOPY
   MECHANISM
Аннотация: A structure formed in nanocrystalline iron-carbon films exposed to an electron beam was studied. Explosive crystallization (EC) with the formation of dendrite and cellular-dendritic instabilities at a rate of up to 1 cm/s was observed. It was shown that the dependence between the growth rate of dendrite branches (or cells) during EC and the rounding radius of dendrite branch tips can be approximately described by equations used to calculate the crystal growth in supercooled melts. To explain the EC mechanism, a model of a liquid zone formed at the crystallization front was used. It was shown that the liquid zone arises due to energy accumulated in the film in the nanocrystalline state. It was assumed that this energy was accumulated due to the energy of elastic stresses. (C) 2004 MAIK "Nauka / Interperiodica".

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Держатели документа:
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Kveglis, L. I.; Жарков, Сергей Михайлович
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Surface bonding states of nano-crystalline diamond balls / J. L. Peng [et al.] // Int. J. Mod. Phys. B. - 2001. - Vol. 15, Is. 31. - P. 4071-4085, DOI 10.1142/S0217979201007865. - Cited References: 20 . - ISSN 0217-9792

РУБ Physics, Applied + Physics, Condensed Matter + Physics, Mathematical
Рубрики:
PLASMON RESPONSE
   POWDER
   SPECTROSCOPY
   MICROSCOPY
   SILICON
   SI(111)
Кл.слова (ненормированные):
diamond -- article -- crystal structure -- electron -- energy transfer -- nanoparticle -- particulate matter -- structure analysis -- surface property -- transmission electron microscopy
Аннотация: The rough surface of nano-crystalline diamond spheres induces surface electronic states which appear as a broadened pre-peak over approx. 15 eV at the C K-edge energy threshold for carbon in the parallel electron energy loss spectrum (PEELS). This appears to be at least partially due to 1s-pi* transitions, although typically the latter occupy a range of only 4 eV for the sp(2) edge of highly-oriented pyrollytic graphite (HOPG). No pi* electrons appear in the conduction band inside the diamond particles, where all electrons are sp(3) hybridized. PEELS data were also obtained from a chemical vapour deposited diamond film (CVDF) and gem-quality diamond for comparison with the spectra of nano-diamonds. The density of sp(2) and sp(3) states on the surface of diamond nano-crystals is calculated for simple structural models of the diamond balls, including some conjecture about surface structures. The results are used to interpret the sp(2)/sp(3) ratios measured from the PEELS spectra recorded as scans across the particles. Surface roughness at the atomic scale was also examined using high-resolution transmission electron microscopy (HRTEM) and electron nano-diffraction patterns were used to confirm the crystal structures.

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Держатели документа:
RMIT Univ, Dept Appl Phys, Melbourne, Vic 3051, Australia
Univ Sydney, Electron Microscope Unit, Sydney, NSW 2006, Australia
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Mol Architecture Grp, Krasnoyarsk 660036, Russia
Russian Acad Sci, Siberian Branch, Inst Biophys, Krasnoyarsk 660036, Russia
Univ Melbourne, Sch Phys, Parkville, Vic 3052, Australia
ИФ СО РАН
ИБФ СО РАН
Department of Applied Physics, RMIT University, Swanston Street, Melbourne, Vic. 3051, Australia
Electron Microscope Unit, University of Sydney, NSW 2006, Australia
Molecular Architecture Group, Kirensky Institute of Physics, Institute of Biophysics, 660036 Krasnoyarsk, Russian Federation
School of Physics, University of Melbourne, Parkville, Vic. 3010, Australia

Доп.точки доступа:
Peng, J. L.; Bulcock, S.; Belobrov, P. I.; Белобров, Петр Иванович; Bursill, L. A.
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