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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, a combined experimental and theoretical study of phase behavior and structure in binary systems of block copolymers and a selective solvent is presented, which consists of poly(ethylene oxide) and poly(propylene oxide) (PPO), and the solvent is water, selective for the PEO block.
Abstract: A combined experimental and theoretical study of phase behavior and structure in binary systems of block copolymers and a selective solvent is presented. The block copolymers used here consist of poly(ethylene oxide) (PEO) and poly(propylene oxide) (PPO), and the solvent is water, selective for the PEO block. The concentration−temperature phase diagrams of (EO)8(PO)47(EO)8 (Pluronic L92) and (EO)11(PO)70(EO)11 (Pluronic L122) in water have been determined experimentally. These two block copolymers are unique in that they form both normal (H1, “oil-in-water”) and reverse (H2, “water-in-oil”) hexagonal lyotropic liquid crystalline structures in binary systems with water over the same temperature range. This is the first time the H2 structure is reported in a binary PEO−PPO−PEO/water system. Thereafter, the predicted phase diagram of (EO)20(PO)69(EO)20 in water is given, employing a self-consistent mean-field lattice theory with internal degrees of freedom. The free energy for a number of possible microstruc...
97 citations
TL;DR: In this paper, the compositions and densities of the liquid and vapor phases of two binary systems at equilibrium were measured on a new experimental apparatus over a range of temperatures and pressures, and the recently developed quasi-chemical hydrogen-bonding (QCHB) model was used for correlating the experimental data.
96 citations
TL;DR: In this paper, local composition models were used to test a newly proposed predictive equation based on local compositions for liquid mixture viscosities and densities, and the results of these studies indicate that the local composition model predictions are generally as good for multicomponent systems as they are for the corresponding binaries.
Abstract: Liquid mixture viscosities and densities have been measured at 298.15 K and ambient pressure for 20 ternary systems. Twelve ternary compositions, encompassing the entire composition range, have been chosen for each system in an effort to test a newly proposed predictive equation based on local compositions. Viscosities calculated by using the local composition model agreed with the experimental data within an average absolute deviation of 6.4%. No adjustable parameters were used and only binary interactions in the form of NRTL constants were input. The results of these studies indicate that the local composition model predictions are generally as good for multicomponent systems as they are for the corresponding binaries. 24 references, 3 tables.
95 citations
TL;DR: In this article, the Redlich−Kister equation has been used to estimate the binary fitting parameters, and root-mean-square deviations from the regression lines are shown, and excess molar volumes were fitted as a function of the mole fraction and temperature to a polynomial equation.
Abstract: Density, refractive index on mixing, and speed of sound at 293.15 K, 298.15 K, 303.15 K, and 313.15 K and atmospheric pressure have been measured over the whole composition range for dimethyl carbonate (DMC) + methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, and 1-pentanol. Excess molar volumes, changes of refractive index on mixing, and deviations in isentropic compressibility for the above systems have been calculated. The Redlich−Kister equation has been used to estimate the binary fitting parameters, and root-mean-square deviations from the regression lines are shown. The excess molar volumes were fitted as a function of the mole fraction and temperature to a polynomial equation.
94 citations
TL;DR: In this article, the authors investigate mass transfer and the formation of disc in binary systems using a combination of numerical simulations and theory, and consider six models distinguished by binary separation, secondary mass and outflow mechanisms.
Abstract: We investigate mass transfer and the formation of disc in binary systems using a combination of numerical simulations and theory. We consider six models distinguished by binary separation, secondary mass and outflow mechanisms. Each system consists of an asymptotic-giant-branch (AGB) star and an accreting secondary. The AGB star loses its mass via a wind. In one of our six models, the AGB star incurs a short period of outburst. In all cases, the secondary accretes part of the ejected mass and also influences the mass-loss rate of the AGB star. The ejected mass may remain gravitationally bound to the binary system and form a circumbinary disk, or contribute to an accretion disk around the secondary. In other cases, the ejecta will escape the binary system. The accretion rate on to the secondary changes non-linearly with binary separation. In our closest binary simulations, our models exemplify the wind Roche lobe overflow while in our wide binary cases, the mass transfer exhibits Bondi-Hoyle accretion. The morphologies of the outflows in the binary systems are varied. The variety may provide clues to how the late AGB phase influences planetary nebulae shaping. We employ the adaptive-mesh-refinement code ASTROBEAR for our simulations and include ray-tracing, radiation transfer, cooling and dust formation. To attain the highest computational efficiency and the most stable results, all simulations are run in the corotating frame.
94 citations