Binary system

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

Viscosity, Density, and Surface Tension of Binary Mixtures of Water and N-Methyldiethanolamine and Water and Diethanolamine and Tertiary Mixtures of These Amines with Water over the Temperature Range 20-100.degree.C

Abstract: The density and viscosity of aqueous solutions of N-methyldiethanolamine were measured over the temperature range 60-100 o C. The density and viscosity of aqueous solutions of diethanolamine and diethanolamine+ N-methyldiethanolamine were measured over the temperature range 20-100 o C. The surface tension of aqueous solutions ofthe above mixtures was measured over the temperature range 20-80 o C. The concentration ranges were 10-50 mass % N-methyldiethanolamine, 10-30 mass % diethanolamine, and 50 mass % totalamine concentration with mass ratios of 0.0441-0.5883 (diethanolamine to N-methyldiethanolamine). The measured quantities were found to be in agreement with the literature where data were available

Solvatochromic behavior of binary supercritical fluids: the carbon dioxide/2-propanol system

Abstract: Dependence of the solvatochromic shift for binary supercritical fluid mixtures as a function of modifier mole fraction, temperature, and pressure is discussed. Carbon dioxide/2-propanol binary fluid mixtures were studied at both subcritical and supercritical conditions. The local composition of the cybotactic region was seen to be enriched in organic cosolvent at low pressures. As the pressure or temperature increased, the local composition of the organic cosolvent decreased. A simple theory is developed to describe the local composition of the fluid in the cybotactic region about the solvatochromic probe molecule.

Phase Equilibria and Volumetric Properties of (1-Ethyl-3-Methylimidazolium Ethylsulfate + Alcohol or Water) Binary Systems

Abstract: Solid–liquid and liquid–liquid phase equilibria in binary mixtures that contain a room-temperature ionic liquid and an alcohol, or water—namely, 1-ethyl-3-methylimidazolium ethylsulfate, [EMIM][EtSO4] with an alcohol (1-octanol, or 1-decanol, or 1-undecanol, or 1-dodecanol) and water have been measured at normal pressure by a dynamic method from 250 to 350 K. By increasing the alkyl chain length of an alcohol, the upper critical solution temperature, UCST, increased (changing from 1-undecanol to 1-dodecanol). Complete miscibility was observed for the systems ([EMIM][EtSO4]+methanol, or ethanol, or 1-propanol, or 1-butanol, 1-pentanol, or 1-hexanol, or 1-heptanol, or 1-octanol, or 1-nonanol, -or 1-decanol and water) at the temperature 298.15 K. Densities and excess molar volumes, VmE, have been determined for [EMIM][EtSO4] with either 1-propanol, or 1-butanol, or 1-pentanol, or 1-hexanol, or 1-heptanol, or 1-octanol, or 1-nonanol, or 1-decanol at 298.15 K and ambient pressure. These systems exhibit negative or positive molar excess volumes. Our experimental VmE data were used for the description of HmE for the chosen systems of [EMIM][EtSO4] with the alcohols under study. The simple Prigogine-Flory-Paterson (PFP) model has given slightly worse results than the Flory-Benson-Treszczanowicz (FBT) model. Negative excess molar volumes observed for 1-propanol and 1-butanol are attributed to hydrogen bonding between the short chain alcohols and ionic liquid, and high packing effects. The FBT model overestimates the self-association of the alcohols in the solutions under study and shifts the calculated curves to higher mole fraction of the alcohol. For each system and for chosen number of the Redlich-Kister parameters, Ar, the partial molar volumes, V1E and V2E, are presented.

The binary Kuiper-belt object 1998 WW31.

Abstract: The recent discovery of a binary asteroid during a spacecraft fly-by generated keen interest, because the orbital parameters of binaries can provide measures of the masses, and mutual eclipses could allow us to determine individual sizes and bulk densities. Several binary near-Earth, main-belt and Trojan asteroids have subsequently been discovered. The Kuiper belt-the region of space extending from Neptune (at 30 astronomical units) to well over 100 AU and believed to be the source of new short-period comets-has become a fascinating new window onto the formation of our Solar System since the first member object, not counting Pluto, was discovered in 1992 (ref. 13). Here we report that the Kuiper-belt object 1998 WW31 is binary with a highly eccentric orbit (eccentricity e approximately 0.8) and a long period (about 570 days), very different from the Pluto/Charon system, which was hitherto the only previously known binary in the Kuiper belt. Assuming a density in the range of 1 to 2 g cm-3, the albedo of the binary components is between 0.05 and 0.08, close to the value of 0.04 generally assumed for Kuiper-belt objects.