Solubility of 2,6-diphenyl-4-(2,4,6-triphenylpyridinium-l-yl) phenolate, commonly known as Reichardt' s betaine dye and a ketocyanine dye has been determined in binary solvent mixtures and in cationic and anionic micellar media. In all the binary mixtures the standard molar free energy of solution, as given by log Sl2 where 512 is the solubility in the binary mixture, cannot be represented by t...

The structure of the Jovian stratosphere at the Galileo probe entry site is investigated through calculations of radiative heating rates based on measurements of the temperature profile, composition, and aerosol distribution. From analysis of mid-IR observations of Jupiter, we determine a C2H2 mole fraction of 1.1–4.3× 10−6 at 0.01 mbar, and a C2H6 mole fraction of 2.8–6.5× 10−6 at 0.4– 10 mbar...

A 1H NMR study of urocanic acid dissolved in water/dimethyl sulfoxide mixtures together with potentiometric determinations of its two successive acidities in the same solutions reveal that a proton is transferred from the imidazolium ring to the carboxylate group when the amount of dimethyl sulfoxide is increased. An analysis of the potentiometric data by means of the classical Hammett linear r...

In this work, the mutual solubilities of sets of ionic liquids ([CnMIM] [TF2N] (n = 4, 8, 12), [C4PY] [TF2N], [C8MIM] [OTF]) and organic compounds (heptane, o-xylene, toluene, or water) are investigated. The experimental data measured for these systems were used to adjust the binary interaction parameters between their components for the Non-Random Two Liquid (NRTL) model. The results showed th...

Gas mixtures of methane and ethane form structure II clathrate hydrates despite the fact that each of pure methane and pure ethane gases forms the structure I hydrate. Optimization of the interaction potential parameters for methane and ethane is attempted so as to reproduce the dissociation pressures of each simple hydrate containing either methane or ethane alone. An account for the structura...

Using a multidiagnostic approach the rate Rev [molec cm−3 s−1] or flux Jev [molec cm−2 s−1] of evaporation of H2O and its corresponding rate constant for condensation, kcond [s−1], on a 1μm thick ice film have been studied in the temperature range 190 to 240 K as well as in the presence of small amounts of HCl and HBr that left the vapor pressure of H2O on ice unchanged. The resulting Arrhenius...

To better understand the combustion chemistry of tetrahydrofuran (THF) and 2-methyltetrahydrofuran (MTHF) which has been considered as promising bio-fuel, the structure of their stoichiometric (φ=1.0) low-pressure laminar premixed flame has been investigated. The flames have been stabilized on a burner at a pressure of 50 Torr (6.7 kPa) using argon as dilutant (78 %), with a gas velocity at the...

A predictive method based on Artificial networks has been developed for the thermophysical properties of binary liquid mixtures at (303.15, 313.15 and 323.15) K. In method 1, a committee ANN was trained using 5 physical properties combined with absolute temperature as its input to predict thermo physical properties of liquid mixtures. Using these data, predicted values were determined for inter...

1. The reaction products of isoniazid with periodate-oxidized ribonucleosides and 5'-ribonucleotides have been characterized as the monohydrazones. 2. The stability, chromatographic and electrophoretic properties of the hydrazones are described. 3. (3)H-labelled isoniazid was shown to react with the 5'-linked terminal adenosine and cytidine groups of periodate-oxidized Escherichia coli transfer...

This work studies the modal gain from I n x G a 1 − A s y S b / $I{n_x}G{a_{1 - x}}A{s_y}S{b_{1 y}}/GaAsSb$ quaternary quantum dots (QD) structures at different mole fractions of structure. The are more flexible in attaining lattice-matching systems. First, In- and As-mole varied. Four In-mole studied ( = 0.01 , 0.03 0.05 $(x\; \;0.01,\;0.03,\;0.05,\;$ 0.07), their emitted wavelengths cover ran...