Готові списки джерел за темами / Demixing effect

Добірка наукової літератури з теми "Demixing effect"

Автор: Grafiati

Опубліковано: 14 березня 2023

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Статті в журналах з теми "Demixing effect"

Zhang, Jun, Li Li, Lipeng Zhang, Shilu Zhao, and Qiang Guo. "Composition demixing effect on cathodic arc ion plating." Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material 13, no. 2 (April 2006): 125–30. http://dx.doi.org/10.1016/s1005-8850(06)60028-5.

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Song, Li, Jiaxiang Lin, Panpan Liu, Jingqing Li, Shichun Jiang, and Dinghai Huang. "Quantitative determination of the spring entropy effect and its indication of the conformational change of polymer coils with varying concentration in aqueous poly(N-isopropylamide) solutions." RSC Advances 9, no. 10 (2019): 5540–49. http://dx.doi.org/10.1039/c9ra00117d.

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Belova, Irina V., D. Samuelis, Manfred Martin, and Graeme E. Murch. "Cation Diffusion and Demixing in Yttria Stabilized Zirconia: Comparison of Assumptions of Constant Electric Field and Constant Current." Defect and Diffusion Forum 258-260 (October 2006): 247–52. http://dx.doi.org/10.4028/www.scientific.net/ddf.258-260.247.

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In this paper, the phenomenon of steady-state cation demixing in yttria-stabilized zirconia in an electric field is examined for the case of an open system wherein the defects are everywhere close to internal surfaces which allow the Schottky-defect reaction to occur (very fine grain material). The effect of the constant electric field assumption as a substitute for the constant current condition is analyzed for diffusion by vacancy-pairs and by vacancy-triplets over a wide range of applied electric fields. It is shown that the assumption of a constant electric field provides only a moderate correction to the shape of the demixing concentration profile.

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Halem, N., Lukasz Cieniek, J. Kusinski, Gianguido Baldinozzi, C. Petot, and Georgette Petot-Ervas. "The Effect of CaO Coatings on the Oxidation Behaviour of Polycrystalline Nickel between 800 and 1200 °C." Materials Science Forum 595-598 (September 2008): 1075–81. http://dx.doi.org/10.4028/www.scientific.net/msf.595-598.1075.

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The present study is concerned with the influence of sputter-coatings CaO on the oxidation behavior of Ni polycrystals. The experiments were performed in air, in the temperature range 800°-1200°C. Below 1200°C, CaO coatings reduce the oxidation rate, while this beneficial effect disappears at 1200 °C. The oxidized specimens were examined by SEM and X-Ray diffraction, but also by EPMA depth profiling to evaluate the scale composition. Furthermore, electrical conductivity measurements and kinetic demixing studies were carried out on Ca-doped NiO single crystals, to get a better insight regarding the transport processes involved during oxidation. These last results show that the key features allowing to explain the effect of CaOcoatings on the oxidation rate of Ni are the influence of calcium on the increase of the dissociation pressure of NiO, which delays the oxidation of nickel, the kinetic demixing of the cations, which controls the distribution of CaO precipitates in the scale responsible for blocking effects, and the increase of the diffusion coefficient of both the cations and the cationic vacancies, which play a decisive role at high temperature, when the scale growth is dominated by lattice diffusion.

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Ranjbarrad, Samira, and Philip K. Chan. "The Effect of Conductive Heat Transfer on the Morphology Formation in Polymer Solutions Undergoing Thermally Induced Phase Separation." Polymers 14, no. 20 (October 15, 2022): 4345. http://dx.doi.org/10.3390/polym14204345.

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Owing to the fact that heat transfer during the thermally induced phase separation process is limited, a quench rate is inevitably entailed, which leads to the existence of temporal and spatial variations in temperature. Hence, it is of great importance to take into account the nonisothermality during the phase separation process, especially in high viscosity polymer solutions. In this study, the influence of conductive heat transfer on the morphology formation during the thermally induced phase separation process was investigated theoretically in terms of quench depth, boundary conditions, and enthalpy of demixing to elucidate the interaction between temperature and concentration through incorporating the nonlinear Cahn-Hilliard equation and the Fourier heat transfer equation in two dimensions. The Flory-Huggins free energy theory for the thermodynamics of phase separation, slow mode theory, and Rouse law for polymer diffusion without entanglements were taken into account in the model development. The simulation results indicated a strong interaction between heat transfer and phase separation, which impacted the morphology formation significantly. Results confirmed that quench depth had an indispensable impact on phase separation in terms of higher characteristic frequency by increasing the driving force for heat transfer. Applying quench from various boundaries led to a difference in the quench rate due to the high viscosity of the polymer solution. This led to a gradation in pore size and anisotropic morphology formation. The degree and direction of anisotropy depended on quench depth and rate, quench time, heat conduction rate inside the solution, solution viscosity, temperature evolution, and the enthalpy of demixing. It was also verified that the influence of enthalpy of demixing on phase separation could not be neglected as it increased the solution temperature and led to phase separation being accomplished at a higher temperature than the initial quench temperature.

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Zander, Roland, Michael Dittmann, and Gerhard M. Schneider. "Dissipative Structures in Demixing Binary Liquid Systems." Zeitschrift für Naturforschung A 45, no. 11-12 (December 1, 1990): 1309–16. http://dx.doi.org/10.1515/zna-1990-11-1213.

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AbstractThe demixing of a horizontal fluid layer of far-critical composition in the presence of a vertical temperature gradient can cause the formation of dissipative structures and thereby lead to a regular distribution of the precipitate. The occurrence of these convective structures is explained with the model of a Rayleigh-Benard instability (RBI) which is driven by parallel gradients of temperature and concentration. The distribution of the precipitate is a synergetic effect of the macroscopic convective pattern and the local action of the Marangoni flow at the surfaces of the drops. If boundary conditions prohibit an RBI, the distribution of the precipitate also becomes inhomogeneous in course of time; however, in this case no regular pattern is observable and the inhomogeneities develop mainly due to the Marangoni convection near the surfaces of the larger drops that have settled at the boundary of the sample volume

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Matsuzaka, Katsuo, Hiroshi Jinnai, Tsuyoshi Koga, and Takeji Hashimoto. "Effect of Oscillatory Shear Deformation on Demixing Processes of Polymer Blends." Macromolecules 30, no. 4 (February 1997): 1146–52. http://dx.doi.org/10.1021/ma961212c.

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Gonzalez, J. J., J. B. Belhaouari, and A. Gleizes. "Influence of demixing effect on the temperature in wall-stabilized arcs." Journal of Physics D: Applied Physics 29, no. 6 (June 14, 1996): 1520–24. http://dx.doi.org/10.1088/0022-3727/29/6/017.

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Kumaran, V. "Effect of Convection on Domain Growth During Demixing Transitions in Fluids." Phase Transitions 75, no. 4-5 (January 2002): 339–52. http://dx.doi.org/10.1080/01411590290027027.

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Belova, Irina V., Graeme E. Murch, D. Samuelis, and Manfred Martin. "Contribution to the Theory of Demixing of Yttrium in Yttria-Stabilized-Zirconia in an Electric Field." Advances in Science and Technology 46 (October 2006): 42–47. http://dx.doi.org/10.4028/www.scientific.net/ast.46.42.

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In this paper, the nature of steady state demixing of yttria-stabilized zirconia in an electric field is examined for the case of open system conditions (very fine grain material) wherein the defects are everywhere close to internal surfaces which allow the Schottky defect reaction to occur. It is shown that under such conditions the applied force needs to be some 20 -25 times larger than for the case of closed system conditions (Schottky defect reaction occurs only at the external surfaces) in order to achieve the same degree of demixing of the cation components. The effect of the constant electric field assumption as a substitute for the constant current condition is also analyzed for a wide range of applied electric fields. It is shown that in most cases, the assumption of a constant electric field provides only a moderate correction to the shape of the concentration profile.

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Більше джерел

Дисертації з теми "Demixing effect"

Zhang, Li. "The study of phase separation in the miscibility gap and ion specific effects on the aggregation of soft matter system." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS106/document.

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Le procédé de séparation de phase est importante car elle détermine la structure des matériaux finaux. Il existe de nombreux systèmes qui ont plus d'une phase tels que des mousses et des gels. Les mousses sont des dispersions aqueuses de bulles de gaz dans une phase aqueuse et gels apparaissent lorsque certains microscopique unité de base commence à se rassembler formant un grand réseau solide qui enjambe l'espace macroscopique. Ils ont de nombreuses applications dans l'industrie et la vie quotidienne. Dans cette thèse, tout d'abord, je me concentre sur l'étude de différents types de séparation de phase. Deuxièmement, je étudié les effets spécifiques d'ions sur l'agrégation des particules colloïdales et tensioactif, le but est de faire des mousses stables. Dans la lacune de miscibilité il existe deux types de séparation de phase: la croissance nucléation et la décomposition spinodale, ils ont différents mécanismes et de la cinétique de croissance. Par conséquent, mon premier projet est d'étudier le processus d'évolution d'eux et de leurs effets sur la structure finale du matériau. Les gels peuvent être préparés par l'ajout de sel à la dispersion de particules colloïdales, ils ont un grand nombre d'applications telles que dans les aliments et la science des matériaux. Dans cette thèse, nous utilisons différents types de sels de comparer les propriétés de gel à partir de deux aspects macroscopiques et microscopiques. Obtenir des mousses stables est significatif dans la vue de leur beaucoup d'applications, mais les moyens de les faire sont pour la plupart compliqué. Dans cette thèse, nous pouvons obtenir des mousses stables par l'intermédiaire de deux façons. On est tout simplement en ajoutant des sels de solutions de tensioactifs, à travers lequel nous pouvons faire la mousse ultra-stable. Une autre façon est d'utiliser la phase de gel, nous avons étudié en tant que phase continue dans les mousses à arrêter le vieillissement de la mousse
Phase separation process is important as it determines the structure of the final materials. There are many systems that have more than one phase such as foams and gels. Aqueous foams are dispersions of gas bubbles in a water phase and gels appear when some basic microscopic unit starts to aggregate forming a large solid network that spans macroscopic space. They have many applications in industry and daily life. In the present thesis, firstly, I focus on studying different types of phase separation. Secondly, I studied the ion specific effects on the aggregation of colloidal particles and surfactant, the purpose is to make stable foams. In the miscibility gap there are two types of phase separation: Nucleation growth and spinodal decomposition, they have different growth mechanisms and kinetics. Therefore, my first p project is to investigate the evolution process of them and their effects to the final structure of material. Gels can be made by adding salt to the dispersion of colloidal particles, they have a large number of applications such as in food and material science. In this dissertation, we use different types of salts to compare gel properties from both macroscopic and microscopic aspects. Obtaining stable foams is significant in the view of their plenty of applications, but the ways to make them are mostly complicated. In this thesis, we can obtain stable foams via two ways. One is simply by adding salts to surfactant solutions, through which we can make ultrastable foam. Another way is using the gel phase we have studied as the continuous phase in foams to arrest the foam aging

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Тези доповідей конференцій з теми "Demixing effect"

Minale, Mario, A. D’Amore, Domenico Acierno, and Luigi Grassia. "Effect of Solvent Viscoelasticity on the Stress Induced Demixing." In V INTERNATIONAL CONFERENCE ON TIMES OF POLYMERS (TOP) AND COMPOSITES. AIP, 2010. http://dx.doi.org/10.1063/1.3455587.

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Pawelec, E., Hans-Jürgen Hartfuss, Michel Dudeck, Jozef Musielok, and Marek J. Sadowski. "Modeling And Measurements Of The Demixing Effect In Arc Plasmas Containing Hydrogen." In PLASMA 2007: International Conference on Research and Applications of Plasmas; 4th German-Polish Conference on Plasma Diagnostics for Fusion and Applications; 6th French-Polish Seminar on Thermal Plasma in Space and Laboratory. AIP, 2008. http://dx.doi.org/10.1063/1.2909141.

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Gorji, M. Hossein, and Patrick Jenny. "A Device Concept for Demixing of Gas Species Based on Excitation of Internal Energy Modes." In ASME 2013 11th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icnmm2013-73142.

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In this work a phenomenon arising from gas-wall interaction in rarefied regimes is presented and discussed. It is hypothesized that the effect of energy transfer between different modes of molecules scattered from walls can be used for demixing of different gas species. In order to study this effect, first a kinetic wall boundary model for diatomic gas molecules is devised. The model is derived by generalizing the Cercignani–Lampis gas-surface interaction kernel in order to embody the gas internal degrees of freedom (DoF). Here, opposed to the extensions of e.g. [5], energy exchange between different molecular modes are honored and thus different physical phenomena arising from inelastic gas–surface collisions can be observed.

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Chandra, Kartik, and Glenn Healey. "Modeling subpixel orientation effects for hyperspectral demixing." In Defense and Security Symposium, edited by Sylvia S. Shen and Paul E. Lewis. SPIE, 2007. http://dx.doi.org/10.1117/12.720884.

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Zimmermann, H., A. Kammerer, R. Fischer, and D. Rebhan. "Two-Phase Flow Correlations in Air/Oil Systems of Aero Engines." In ASME 1991 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/91-gt-054.

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A strategy is outlined on how to introduce two-phase flow correlations into air/oil system calculations for aero engines. The importance of two-phase flow effects is highlighted by demonstrating their particular significance for the high altitude performance of a vent system. For air/oil mixtures very little can be obtained from the literature and correlations derived from air/water test results have to be corrected. For critical flow conditions in restrictors an improved method is developed. Some test data obtained for air/oil mixtures show, that the proposed correlations agree fairly well. Furthermore, it is shown how numerical methods for this complex field of fluid dynamics can be used in the future by the example of phase demixing by centrifugal forces.

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Marliere, Claire, Vincent Miralles, Claire Morgand, Virginie Rome, Aymerick Le Bris, Chloé Guilloteau, Tiphaine Courtaud, and David Rousseau. "Surfactant-Polymer Compatibility in Bulk and Static Conditions vs. Confined and Under Flow Conditions." In SPE Conference at Oman Petroleum & Energy Show. SPE, 2022. http://dx.doi.org/10.2118/200074-ms.

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Abstract The objective of surfactant-polymer (SP) formulation design is to simultaneously achieve ultra-low interfacial tension and good mobility ratio. However, in some cases, the presence of both polymer and surfactant can cause compatibility issues leading to a cloudy or even demixing solution. Until now, those observations were made in bulk conditions but the assessment of this behavior has not been studied in confined and under flow conditions. Three SP compatibility cases were selected using the same SP formulation and playing on the brine salinity (low, medium and high). Bulk and kinetic studies based on solubility, viscosity and cryo-TEM were performed prior to monophasic injections carried out in a transparent micromodel representing a 2D rock porous medium and in a coreflood rig with a 3D outcrop rock. The observation in micromodel was performed using an optical microscope under polarized light to visualize the physical structure of the SP formulations. The pressure drop along the core was monitored during coreflood experiments to measure the mobility reduction entailed by the injected solution. In bulk conditions it is shown that increasing the solution salinity leads, after a few to several days depending on the solution's volume, to a degradation of the SP compatibility or even demixing. This behavior can be attributed to depletion effects. In this case, depletion is due to the formation of surfactant vesicles (hundreds of namometers in size) that tend to aggregate in the presence of polymer molecules. As expected, injection of the compatible SP solution (at low salinity) in the 2D porous medium micromodel and in the outcrop rock led to an easy in-depth transport, namely mobility reduction compatible with the viscosity of the solution. More interestingly, the same formulation at higher salinity exhibited a deposit of SP aggregates having a crystalline structure when injected in the micromodel. However, this formulation at high salinity did not show any issue in terms of mobility reduction when injected in the outcrop rock as the mobility reduction stabilized rapidly at a value close to the relative viscosity of the solution. These results highlight that the presence of a demixing phase does not always induce propagation issues in cores and that some cloudy SP solutions could be injected without causing any pressure increase. The objective of this study was to correlate the bulk behavior of SP formulations showing respectively good and poor compatibilities with their performance in confined and under flow conditions. It has been proved that a poor compatibility in bulk does not always induce transport issues when the solution is injected in porous medium, despite the deposit of structured aggregates in some pores.

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Звіти організацій з теми "Demixing effect"

Van Hook, W. A. The effect of pressure, isotopic (H/D) substitution, and other variables on miscibility in polymer-solvent systems. The nature of the demixing process; dynamic light scattering and small angle neutron scattering studies. Final report. Office of Scientific and Technical Information (OSTI), January 2000. http://dx.doi.org/10.2172/765324.

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