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 Найдено в других БД:Каталог книг и продолжающихся изданий (2)Нанотехнологии (1)Труды Института высокотемпературной электрохимии УрО РАН (2)Труды сотрудников Института органического синтеза УрО РАН (3)Труды сотрудников Института химии твердого тела УрО РАН (7)Расплавы (5)Публикации Чарушина В.Н. (2)
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Общее количество найденных документов : 54
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1.
Инвентарный номер: нет.
   
   F 17

    Faizullin, M. Z.
    Hydrate formation in layers of gas-saturated amorphous ice [Electronic resource] / M. Z. Faizullin, A. V. Vinogradov, V. P. Koverda // Chemical Engineering Science. - 2015. - Vol. 130. - С. 135-143. - Bibliogr. : p. 142-143 (44 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
AMORPHOUS ICE -- GAS HYDRATES -- CARBON DIOXIDE
Аннотация: Layers of amorphous ice saturated with methane, ethane, propane and carbon dioxide were obtained by condensation of molecular beams of rarefied vapor and gas on a substrate cooled with liquid nitrogen. The amorphous state of such objects at low temperatures is stabilized by the high viscosity and the small value of the stationary nucleation rate of the crystal phase. Their heating in condition of high metastability is accompanied by spontaneous explosive crystallization, which leads to the formation of gas hydrates. Glass-transition and crystallization temperatures were determined by changes in their dielectric properties under heating. An increase in the gas content in layers of amorphous ice causes an increase in the crystallization temperature without any significant changes in the glass transition temperature. At atmospheric pressure in a liquid n-pentane medium the retention of gas hydrates was observed up to temperatures close to 273. K. Self-preservation ensured the retention of hydrates in a metastable state at temperatures exceeding considerably their equilibrium dissociation temperatures. Samples of gas hydrates obtained at a maximum gas flow rate during the deposition contained up to 15 mass % of methane, 12 mass % of ethane, 13 mass % of propane, and 23 mass % of carbon dioxide

\\\\expert2\\nbo\\Chemical Engineering Science\\2015, v.130, p.135-143.pdf
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2.
Инвентарный номер: нет.
   
   F 17

    Faizullin, M. Z.
    Hydrate formation in layers of gas-saturated amorphous ice [Electronic resource] / M. Z. Faizullin, A. V. Vinogradov, V. P. Koverda // Chemical Engineering Science. - 2015. - Vol. 130. - С. 135-143. - Bibliogr. : p. 142-143 (44 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
AMORPHOUS ICE -- GAS HYDRATES -- CARBON DIOXIDE
Аннотация: Layers of amorphous ice saturated with methane, ethane, propane and carbon dioxide were obtained by condensation of molecular beams of rarefied vapor and gas on a substrate cooled with liquid nitrogen. The amorphous state of such objects at low temperatures is stabilized by the high viscosity and the small value of the stationary nucleation rate of the crystal phase. Their heating in condition of high metastability is accompanied by spontaneous explosive crystallization, which leads to the formation of gas hydrates. Glass-transition and crystallization temperatures were determined by changes in their dielectric properties under heating. An increase in the gas content in layers of amorphous ice causes an increase in the crystallization temperature without any significant changes in the glass transition temperature. At atmospheric pressure in a liquid n-pentane medium the retention of gas hydrates was observed up to temperatures close to 273. K. Self-preservation ensured the retention of hydrates in a metastable state at temperatures exceeding considerably their equilibrium dissociation temperatures. Samples of gas hydrates obtained at a maximum gas flow rate during the deposition contained up to 15 mass % of methane, 12 mass % of ethane, 13 mass % of propane, and 23 mass % of carbon dioxide

\\\\expert2\\nbo\\Chemical Engineering Science\\2015, v.130, p.135-143.pdf
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3.
Инвентарный номер: нет.
   
   E 93

   
    Evaluation of metastable region boundaries for liquid and solid states in MD simulations [Electronic resource] / G. V. Ionov, V. V. Dremov, A. V. Karavaev, S. P. Protsenko, V. G. Baidakov, A. O. Tipeev // Journal of Physics : Condensed Matter. - 2014. - Vol.500, №17. - Article number 172004. - Bibliogr. : (6 ref)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
DIFFUSION -- DYNAMIC LOADS -- LIQUIDS
Аннотация: An automatic method based on MD simulations was developed for detecting and tracing the boundaries of metastable states of superheated crystal and supercooled liquid. The main criterion of the detection of early nucleation of new phase is the self-diffusion coefficient temperature dependence. The scanning for nucleation events is performed at continuous temperature change. The set of independent nucleation events at a given pressure allows evaluation of temperature dependence of specific nucleation frequency. The collection of a large number of these calculations allows accurate approximation of pressure and temperature dependence of the specific nucleation frequency in both directions between phases. This dependence allows estimating the behavior of the free energy in the region between superheating and supercooling curves. In addition, dependence of nucleation frequency on pressure and temperature provides an opportunity to integrate the probability of nucleation under dynamic loading and subsequent release and thus to determine the likelihood of the crystallization and melting. The technique was applied to tin. MD simulation was carried out with the help of the EAM interatomic potential, well reproducing the properties of BCC phase.

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4.
Инвентарный номер: нет.
   
   F 76

   
    Formation of gas hydrate during crystallization of ethane-saturated amorphous ice / M. Z. Faizullin, A. V. Vinogradov, V. N. Skokov, V. P. Koverda // Russian Journal of Physical Chemistry A. - 2014. - Vol.88, №10. - С. 1706-1711. - Bibliogr. : p. 1710-1711 (24 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
AMORPHOUS ICE -- CRYSTALLIZATION -- VITRIFICATION
Аннотация: Layers of ethane-saturated amorphous ice were prepared by depositing molecular beams of water and gas on a substrate cooled with liquid nitrogen. The heating of the layers was accompanied by vitrification (softening) followed by spontaneous crystallization. Crystallization of condensates under the conditions of deep metastability proceeded with gas hydrate formation. The vitrification and crystallization temperatures of the condensates were determined from the changes in their dielectric properties on heating. The thermal effects of transformations were recorded by differential thermal analysis. The crystallization of the amorphous water layers was studied by electron diffraction. Formation of a metastable packing with elements of a cubic diamond-like structure was noted

\\\\expert2\\nbo\\Russian Journal of Physical Chemistry A, Focus on Chemistry\\2014, V.88, N 10, p.1706.pdf
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5.
Инвентарный номер: нет.
   
   F 76

   
    Formation of gas hydrate during crystallization of ethane-saturated amorphous ice / M. Z. Faizullin, A. V. Vinogradov, V. N. Skokov, V. P. Koverda // Russian Journal of Physical Chemistry A. - 2014. - Vol.88, №10. - С. 1706-1711. - Bibliogr. : p. 1710-1711 (24 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
AMORPHOUS ICE -- CRYSTALLIZATION -- VITRIFICATION
Аннотация: Layers of ethane-saturated amorphous ice were prepared by depositing molecular beams of water and gas on a substrate cooled with liquid nitrogen. The heating of the layers was accompanied by vitrification (softening) followed by spontaneous crystallization. Crystallization of condensates under the conditions of deep metastability proceeded with gas hydrate formation. The vitrification and crystallization temperatures of the condensates were determined from the changes in their dielectric properties on heating. The thermal effects of transformations were recorded by differential thermal analysis. The crystallization of the amorphous water layers was studied by electron diffraction. Formation of a metastable packing with elements of a cubic diamond-like structure was noted

\\\\expert2\\nbo\\Russian Journal of Physical Chemistry A, Focus on Chemistry\\2014, V.88, N 10, p.1706.pdf
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6.
Инвентарный номер: нет.
   
   E 93

   
    Evaluation of metastable region boundaries for liquid and solid states in MD simulations [Electronic resource] / G. V. Ionov, V. V. Dremov, A. V. Karavaev, S. P. Protsenko, V. G. Baidakov, A. O. Tipeev // Journal of Physics : Condensed Matter. - 2014. - Vol.500, №17. - Article number 172004. - Bibliogr. : (6 ref)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
DIFFUSION -- DYNAMIC LOADS -- LIQUIDS
Аннотация: An automatic method based on MD simulations was developed for detecting and tracing the boundaries of metastable states of superheated crystal and supercooled liquid. The main criterion of the detection of early nucleation of new phase is the self-diffusion coefficient temperature dependence. The scanning for nucleation events is performed at continuous temperature change. The set of independent nucleation events at a given pressure allows evaluation of temperature dependence of specific nucleation frequency. The collection of a large number of these calculations allows accurate approximation of pressure and temperature dependence of the specific nucleation frequency in both directions between phases. This dependence allows estimating the behavior of the free energy in the region between superheating and supercooling curves. In addition, dependence of nucleation frequency on pressure and temperature provides an opportunity to integrate the probability of nucleation under dynamic loading and subsequent release and thus to determine the likelihood of the crystallization and melting. The technique was applied to tin. MD simulation was carried out with the help of the EAM interatomic potential, well reproducing the properties of BCC phase.

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7.
Инвентарный номер: нет.
   
   F 17

    Faizullin, M. Z.
    Properties of gas hydrates formed by nonequilibrium condensation of molecular beams [Electronic resource] / M. Z. Faizullin, A. V. Vinogradov, V. P. Koverda // High Temperature. - 2014. - Vol. 52, № 6. - С. 830-839. - Bibliogr. : p. 838-839 (36 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
GLASS-TRANSITION -- AMORPHOUS SOLIDS -- AQUEOUS-SOLUTIONS
Аннотация: Low-temperature crystallization of amorphous materials has been analyzed theoretically taking into account nonstationary nucleation. The kinetics of crystallization of amorphous water layers, formed by depositing molecular beams on a substrate cooled by liquid nitrogen, has been investigated by differential thermal analysis. The conditions of gas hydrate formation in low-temperature amorphous-ice layers saturated with carbon dioxide have been studied. The glass-transition and crystallization temperatures of the gas hydrates have been determined from the change in dielectric properties upon heating. Under the deep-metastability conditions, crystallization of water-gas layers leads to the formation of crystallohydrates. Gas molecules are captured by the avalanche-like nucleation of crystallization centers and, therefore, are not displaced by the moving crystal-melt interface. Gas-hydrate samples formed in nonequilibrium water-gas layers are convenient for studying their thermophysical properties

\\\\expert2\\nbo\\High Temperature\\2014, v. 52, N 6, p.830-839.pdf
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8.
Инвентарный номер: нет.
   
   F 17

    Faizullin, M. Z.
    Properties of gas hydrates formed by nonequilibrium condensation of molecular beams [Electronic resource] / M. Z. Faizullin, A. V. Vinogradov, V. P. Koverda // High Temperature. - 2014. - Vol. 52, № 6. - С. 830-839. - Bibliogr. : p. 838-839 (36 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
GLASS-TRANSITION -- AMORPHOUS SOLIDS -- AQUEOUS-SOLUTIONS
Аннотация: Low-temperature crystallization of amorphous materials has been analyzed theoretically taking into account nonstationary nucleation. The kinetics of crystallization of amorphous water layers, formed by depositing molecular beams on a substrate cooled by liquid nitrogen, has been investigated by differential thermal analysis. The conditions of gas hydrate formation in low-temperature amorphous-ice layers saturated with carbon dioxide have been studied. The glass-transition and crystallization temperatures of the gas hydrates have been determined from the change in dielectric properties upon heating. Under the deep-metastability conditions, crystallization of water-gas layers leads to the formation of crystallohydrates. Gas molecules are captured by the avalanche-like nucleation of crystallization centers and, therefore, are not displaced by the moving crystal-melt interface. Gas-hydrate samples formed in nonequilibrium water-gas layers are convenient for studying their thermophysical properties

\\\\expert2\\nbo\\High Temperature\\2014, v. 52, N 6, p.830-839.pdf
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9.
Инвентарный номер: нет.
   
   F 17

    Faizullin, M. Z.
    Preparation of gas hydrates by nonequilibrium condensation of molecular beams / M. Z. Faizullin, A. V. Vinogradov, V. P. Koverda // Technical Physics Letters . - 2013. - Vol.39, №9. - С. 783-786. - Bibliogr. : p. 786 (16 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
CARBON DIOXIDE -- CRYSTALLIZATION TEMPERATURES -- DIELECTRIC PROPERTIES
Аннотация: Layers of amorphous ice saturated with carbon dioxide were prepared by the deposition of molecular beams of water and gas onto a substrate cooled with liquid nitrogen. Their heating is accompanied by glass transition (softening) and subsequent spontaneous crystallization. The glass transition and crystallization temperatures were determined from the change in dielectric properties during heating. The heat effects of the transformations were detected using differential thermal analysis. The crystallization of amorphous layers under conditions of deep metastability leads to the formation of crystalline hydrates. The avalanche nucleation of crystallization sites captures the gas molecules; therefore, they are not displaced by the movement of the crystallization front

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10.
Инвентарный номер: нет.
   
   F 17

    Faizullin, M. Z.
    Formation of clathrate hydrates under crystallization of gas-saturated amorphous ice [Electronic resource] / M. Z. Faizullin, A. V. Vinogradov, V. P. Koverda // International Journal of Heat and Mass Transfer. - 2013. - Vol.65. - С. 649-654. - Bibliogr. : p. 654 (42 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
CLATHRATE HYDRATE -- KINETICS -- METHANE
Аннотация: Layers of methane-saturated amorphous ice were obtained by deposition of molecular beams of water and gas on a substrate cooled with liquid nitrogen. Their heating is accompanied by glass transition (softening) and subsequent spontaneous crystallization. The avalanche-type initiation of crystallization centers captures the gas molecules and does not lead to their displacement by the motion of the crystallization front. Under crystallization of amorphous water-gas condensates in conditions of deep metastability the formation of gas hydrates takes place. Glass-transition and crystallization temperatures of the condensates were determined by changes in their dielectric properties under heating. The method of differential thermal analysis has been used to investigate the kinetics of crystallization of amorphous water layers. Properties that characterize the water crystallization kinetics have been determined on the basis of the obtained data on the dependence of the crystallization temperature on the heating rate

\\\\expert2\\NBO\\International Journal of Heat and Mass Transfer\\2013, v.65, p.649-654.pdf
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