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Binary system
About: Binary system is a research topic. Over the lifetime, 5788 publications have been published within this topic receiving 97882 citations.
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TL;DR: In this paper, an exact solution for the growth of an intermediate phase layer in a three-phase binary system, when diffusion rates in any phase are independent of concentration, is presented, and certain limiting forms of this solution are discussed.
33 citations
TL;DR: In this article, a new EOS/G ex-type mixing rule with special attention to calculating the solid solubilities of aromatic hydrocarbons, aliphatic carboxylic acids, aromatic acids, and heavy alcohols in supercritical carbon dioxide was developed.
Abstract: The aim of this study is to develop a new EOS/G ex -type mixing rule with special attention to calculating the solid solubilities of aromatic hydrocarbons, aliphatic carboxylic acids, aromatic acids, and heavy aliphatic and aromatic alcohols in supercritical carbon dioxide. A volume correction term is applied with a combination of second and third virial coefficients which the equation for the third virial coefficient is quadratic, according to the suggestion by Hall and Iglesias-Silva. In this study, the cubic Peng–Robinson (PR) and Soave–Redlich–Kwong (SRK) equations of state have been used to calculate the solid solubilities of 23 solutes in supercritical CO 2 , by using six mixing rules, namely, the Wong–Sandler (WS) rule, the Orbey–Sandler (OS) rule, the van der Waals one fluid rule with one (VDW1) and two (VDW2) adjustable parameters, the covolume dependent (CVD) rule and the new mixing rule. In all cases, the NRTL model was chosen as the excess Gibbs free energy model. The coefficients of the NRTL model and the binary interaction parameters of six mixing rules with two EOSs (PR and SRK EOSs) have been determined for 100 data sets of 23 binary systems over a wide range of temperatures and pressures covering more than 970 experimental data points which are reported in the literature. The results show that the PR EOS with the new mixing rule model is more accurate than the PR and SRK EOSs with the other mixing rules for solid solubility calculations in supercritical carbon dioxide. The regressed interaction parameters of the binary system, without any further modification, were then extended to four ternary mixtures, giving satisfactory results of the solid solubilities in supercritical CO 2 .
33 citations
TL;DR: In this article, the authors measured densities and viscosities for anisole with 2-butanol, 2-methyl-1-propanol, and 2methyl-2-propanol binary liquid mixtures with a vibrating-tube densimeter and Cannon-Fenske routine viscometers over the temperature range between 303.15 and 323.15 K and at atmospheric pressure.
Abstract: Densities and viscosities were measured for anisole with 2-butanol, 2-methyl-1-propanol, and 2-methyl-2-propanol binary liquid mixtures with a vibrating-tube densimeter and Cannon-Fenske routine viscometers over the temperature range between 303.15 and 323.15 K and at atmospheric pressure. Excess molar volumes and viscosity deviations were calculated at various temperatures. Both excess molar volumes and the viscosity deviations are negative for all investigated systems. The isothermal excess molar volumes and viscosity deviations were fitted to a Redlich−Kister type equation, and the kinematic viscosity data were correlated with the McAllister equation.
33 citations
TL;DR: In this article, the absolute parameters of PY Vir were derived using spectroscopic and photometric solutions, and the O -C diagram of the binary star was investigated by combining new determined times of minimum light with others published in the literature.
Abstract: Complete CCD photometric light curves in BV(RI)(c) bands obtained in 2012 for the short-period close binary system PY Virginis are presented. A new photometric analysis with the Wilson-Van Hamme code shows that PY Vir is an A-type marginal contact binary system. The absolute parameters of PY Vir are derived using spectroscopic and photometric solutions. Combining new determined times of minimum light with others published in the literature, the O - C diagram of the binary star is investigated. A periodic variation, with a period of 5.22(+/- 0.05) years and an amplitude of 0.0075(+/- 0.0004) days, was discovered. Since the spectrum of a third component has been detected by Rucinski et al., we consider this cyclic period oscillation to be the result of the light-time effect due to the presence of a third body. This third component may also be a binary itself. Therefore, PY Vir should be a quadruple system composed of two cool-type binary systems. This system is a good astrophysical laboratory to study the formation and evolution of close binaries and multiple systems.
33 citations
TL;DR: In this paper, the enthalpies of formation of seven intermetallic phases of the Gd-Ni binary system were measured by a calorimetric method involving dissolution of the compounds in molten Al.
Abstract: The enthalpies of formation of seven intermetallic phases of the Gd-Ni binary system were measured by a calorimetric method involving dissolution of the compounds in molten Al. These experimental values are compared with model predictions obtained from a tight-binding approach. It is shown that the relatively large difference between the energy levels of the two elements is a dominant factor in the determination of the formation energy. The highly asymmetric shape of the formation energy as a function of composition is discussed considering the particular shape of the density of states of these compounds.
33 citations