Binary system

About: Binary system is a research topic. Over the lifetime, 5788 publications have been published within this topic receiving 97882 citations.

Systematic Mapping of Binary Nanocrystal Superlattices: The Role of Topology in Phase Selection.

Abstract: The self-assembly of two sizes of spherical nanocrystals has revealed a surprisingly diverse library of structures. To date, at least 15 distinct binary nanocrystal superlattice (BNSL) structures have been identified. The stability of these binary phases cannot be fully explained using the traditional conceptual framework treating the assembly process as entropy-driven crystallization of rigid spherical particles. Such deviation from hard sphere behavior may be explained by the soft and deformable layer of ligands that envelops the nanocrystals, which contributes significantly to the overall size and shape of assembling particles. In this work, we describe a set of experiments designed to elucidate the role of the ligand corona in shaping the thermodynamics and kinetics of BNSL assembly. Using hydrocarbon-capped Au and PbS nanocrystals as a model binary system, we systematically tuned the core radius (R) and ligand chain length (L) of particles and subsequently assembled them into binary superlattices. Th...

Micro-structure studies of the molten binary K3AlF6–Al2O3 system by in situ high temperature Raman spectroscopy and theoretical simulation

Abstract: In order to assist in predicting the properties of molten cryolite-alumina electrolytes widely used in the Hall–Heroult process, the micro-structure of the molten binary system was investigated by in situ high temperature Raman spectroscopy from room temperature to 1273 K under an argon atmosphere. The symmetric stretching vibrational wavenumbers of possible clusters in the molten system were further calculated through quantum chemistry ab initio simulations and compared with the experimental Raman spectra of the molten system. The molten K3AlF6–Al2O3 system was found to consist of [AlF5]2−, [AlF6]3−, [Al2OF6]2− and [Al2O2F4]2− clusters. With the increasing addition of Al2O3 to molten K3AlF6, the structure of six-coordinated Al atoms connected by terminal fluorine is partly believed to evolve into a structure of two four-coordinated Al atoms connected by single-bridging oxygen. The mole percentage of the species in the melt was also calculated from the experimental Raman spectra. As the Al2O3 content increased from 0 to 8.0 wt%, the content of [Al2OF6]2− in the melt was found to increase swiftly from 0 to 33.0 mol%, while the [Al2O2F4]2− content decreased after reaching a maximum of 1.5 mol%.

Physical Properties of the Ternary Mixture Dimethyl Carbonate + Methanol + Benzene and Its Corresponding Binaries at 298.15 K

Abstract: Density, refractive index, and speed of sound of the binary dimethyl carbonate + methanol, dimethyl carbonate + benzene and methanol + benzene and the ternary dimethyl carbonate + methanol + benzene mixtures have been measured at 298.15 K and atmospheric pressure, over the entire composition range. These results are used to calculate excess molar volumes, changes of refractive index on mixing, and deviations in isentropic compressibility for the above systems. The calculated quantities are further fitted to the Redlich−Kister and the Cibulka equations to estimate the binary and ternary fitting parameters, respectively, and root-mean-square deviations from the regression lines. Values of derived and excess properties were estimated and compared by different methods. Excess partial molar volumes at infinite dilution are also calculated.

Isothermal Vapor−Liquid Equilibria of the Carbon Dioxide (CO2)−N,N-Dimethylformamide (DMF) System at Temperatures from 293.95 K to 338.05 K and Pressures up to 12 MPa

Abstract: Vapor−liquid equilibrium data are presented for the binary system carbon dioxide−N,N-dimethylformamide at 293.95, 313.05, and 338.05 K and pressures up to 12 MPa. The data are correlated using the Peng−Robinson equation of state with Wong−Sandler mixing rules. Agreement between the calculated and the measured equilibrium data has been found within 0.03% for vapor mole fractions and within 0.6% for pressures.