Mixing enthalpies of six binary systems involving sulfolane over the entire composition range, at 303.16 K

1986 ◽  
Vol 31 (2) ◽  
pp. 157-160 ◽  
Author(s):  
Michele Pansini ◽  
Liliana Jannelli
Keyword(s):  
Binary Systems ◽  
Composition Range ◽  
Entire Composition Range ◽  
Mixing Enthalpies

scholarly journals Calculation of activities in Ga-Cd and Cu-Pb binary systems

2002 ◽  
Vol 38 (3-4) ◽  
pp. 273-284 ◽  
Author(s):  
Dragan Manasijevic ◽  
Dragana Zivkovic ◽  
Zivan Zivkovic
Keyword(s):  
Melting Point ◽  
Phase Diagrams ◽  
Binary Systems ◽  
Composition Range ◽  
Entire Composition Range ◽  
Melting Point Depression ◽  
Calculation Methods ◽  
Duhem Equation ◽  
Coexisting Phases ◽  
Mutual Comparison

Calculations of activities in Ga-Cd and Cu-Pb binary systems were done based on their known phase diagrams, using different calculation methods. First, activities of cadmium at 700 K and copper at 1263 K in Ca - Cd and Cu - Pb systems, respectively, were calculated by melting point depression method and Zhang-Chou method for binary systems with phase diagrams involving two liquid or solid coexisting phases. In order to obtain activity values in the entire composition range, these methods were applied in the definite parts of composition range in both investigating systems. The same procedure was done, using modified Rao- Belton method by Chou, who used Richardson assumption. Activities of the second component in both investigating systems were calculated by use of Gibbs-Duhem equation. All calculated results were compared with literature data and mutual comparison between applied methods was done.

Mixing Enthalpies of TbBr3-MBr Liquid Mixtures

2001 ◽  
Vol 56 (12) ◽  
pp. 859-864 ◽  
Author(s):  
L. Rycerz ◽  
M. Gaune-Escard
Keyword(s):  
Mole Fraction ◽  
Composition Range ◽  
Liquid Mixtures ◽  
Entire Composition Range ◽  
Mixing Enthalpy ◽  
Rich Region ◽  
Enthalpies Of Mixing ◽  
Binary Liquid ◽  
Liquid Systems ◽  
Mixing Enthalpies

AbstractThe molar enthalpies of mixing, Δmix Hm in the binary liquid systems TbBr3-MBr (M = Li, Na, K, Rb, Cs) have been m easured with a Calvet-type high-tem perature microcalorimeter over the entire composition range with an accuracy of about 6 %. Mixing of the two liquid components was achieved by using the “break-off am poule” technique. All the investigated systems show negative enthalpies of mixing with a minim um value of approxim ately -1.25, - 8 .3 , -17.0, - 2 0 . 0 and -22.5 kJ mol -1, for M = Li, Na, K, Rb and Cs, respectively. The mixing enthalpy in the TbBr3- LiBr system is positive in the TbBr3-rich region. For all the systems, the enthalpy minimum occurs at mole fraction xTbBr3 ≈ 0.3 - 0.4. The molar enthalpies of form ation Δ formHm (3MBr, TbBr3, 1) for M = Li, Na, K, Rb and Cs at 1113 K (arising from the reaction 3M Br(1) +TbBr3(1) = (3MBr, TbBr3) (1)) are found to be -4 .8 , -31.3, -63.3, -70.3 and -8 1 .2 kJ mol-1 , respectively. The leastsquares coefficients A, B, C, D and E in the equation λ (kJ mol-1) = A + B x + C x2 + Dx3 + Ex4, where A is an interaction param eter and x = xTbBr , are also reported.

Alloyed (ZnSe)x(CuInSe2)1–xand CuInSexS2–xNanocrystals with a Monophase Zinc Blende Structure over the Entire Composition Range

2011 ◽  
Vol 50 (23) ◽  
pp. 11958-11964 ◽  
Author(s):  
Shenjie Li ◽  
Zechen Zhao ◽  
Qinghui Liu ◽  
Lijian Huang ◽  
Gang Wang ◽  
...  
Keyword(s):  
Composition Range ◽  
Entire Composition Range ◽  
Zinc Blende ◽  
Zinc Blende Structure

The local structure in the BmimPF6/acetonitrile mixture: the charge distribution effect

2018 ◽  
Vol 20 (34) ◽  
pp. 21890-21902 ◽  
Author(s):  
Volodymyr Koverga ◽  
Oleg N. Kalugin ◽  
François-Alexandre Miannay ◽  
Yevheniia Smortsova ◽  
Kateryna Goloviznina ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Binary Mixture ◽  
Charge Distribution ◽  
Local Structure ◽  
Composition Range ◽  
Entire Composition Range ◽  
Distribution Effect

The effect of the charge distribution on the local structure in the binary mixture of 1-butyl-3-methylimidazolium hexafluorophosphate (BmimPF6) ionic liquid and acetonitrile is investigated over the entire composition range.

scholarly journals Structural and Elastic Properties of α‐(Al x Ga 1− x ) 2 O 3 Thin Films on (11.0) Al 2 O 3 Substrates for the Entire Composition Range

2020 ◽  
pp. 2000394 ◽  
Author(s):  
Anna Hassa ◽  
Philipp Storm ◽  
Max Kneiß ◽  
Daniel Splith ◽  
Holger von Wenckstern ◽  
...  
Keyword(s):  
Thin Films ◽  
Elastic Properties ◽  
Composition Range ◽  
Entire Composition Range

scholarly journals Nanocrystals of CuCr2S4−xSex chalcospinels with tunable magnetic properties

2016 ◽  
Vol 4 (16) ◽  
pp. 3628-3639 ◽  
Author(s):  
Karthik Ramasamy ◽  
Hunter Sims ◽  
Sahar Keshavarz ◽  
Nariman Naghibolashrafi ◽  
Arunava Gupta
Keyword(s):  
Magnetic Properties ◽  
Electronic Structure ◽  
Composition Range ◽  
Electronic Structure Calculations ◽  
Entire Composition Range ◽  
Half Metallic ◽  
Reduced Dimensions ◽  
Structure Calculations

Nanocrystals of magnetic chalcospinels CuCr2S4−xSex (0 ≤ x ≤ 4) have been synthesized over the entire composition range and their magnetic properties investigated. Electronic structure calculations predict metallic characteristics in the bulk and “half-metallic” at reduced dimensions.

scholarly journals Thermodynamic properties of 1-ethyl-3-methylimidazolium ethyl sulphate with nitrogen and sulphur compounds at T = (298.15 - 318.15) K and P = 1 bar

2016 ◽  
Author(s):  
◽  
Siyanda Brian Chule
Keyword(s):  
Refractive Index ◽  
Thermodynamic Properties ◽  
Binary Mixture ◽  
Binary Mixtures ◽  
Mole Fraction ◽  
Ethyl Acetoacetate ◽  
Binary Systems ◽  
Composition Range ◽  
Molar Refraction ◽  
The Ideal

In this work, the thermodynamic properties for the binary mixtures containing the ionic liquid (IL): 1-ethyl-3-methylimidazolium ethyl sulphate ([EMIM] [EtSO4]) were calculated. The binary systems studied were {pyridine (Py) or ethyl acetoacetate (EAA) or thiophene (TS) + [EMIM] [EtSO4]}. The results were interpreted in terms of the intermolecular interactions between the (pyridine + IL), (ethyl acetoacetate + IL), and (thiophene + IL) molecules. The physical properties: density, speed of sound, and refractive index were measured for the binary mixtures over the complete mole fraction range using an Anton Paar DSA 5000 M vibrating U- tube densimeter and an Anton Paar RXA 156 refractometer, respectively. The measurements were done at T = (298.15, 303.15, 308.15, 313.15, and 318.15) K and at p = 0.1 MPa. The experimental data was used to calculate the derived properties for the binary mixtures namely:- excess molar volume (V E ), isentropic compressibility (ks), molar refractions (R) and deviation in refractive index (Δn). For the binary mixtures, (Py or EAA or TS + IL), V E was negative throughout the whole composition range which indicates the existence of attractive intermolecular interaction between (pyridine + IL) and (ethyl acetoacetate + IL) for (thiophene + IL), V E was negative at low mole fraction of thiophene and became positive at high mole fraction of thiophene. For the binary mixtures (pyridine + IL), (ethyl acetoacetate + IL), ks was positive indicating that the binary mixtures were more compressible than the ideal mixture. For the binary mixture (thiophene + IL) ks was negative at low thiophene composition and positive at high composition indicating that the binary mixture was less compressible than the ideal mixture at low thiophene composition and more compressible at high composition of thiophene. The molar refraction, R, is positive for the (Py or EAA or TS + IL) binary systems at T = (298.15 – 318.15) K, molar refraction decreases as the organic solvent composition increases. For the binary mixture (pyridine + [EMIM] [EtSO4]), Δn is negative at mole fractions < 0.75 of pyridine and positive at mole fractions >0.75 at all temperatures and decreases with an increase in temperature. For the binary system (ethyl acetoacetate + [EMIM] [EtSO4]), Δn values are positive over the entire composition range and at all temperatures and increases with an increase in temperature. Δn values for the (thiophene + IL) system are negative for mole fractions of thiophene < 0.62 and becomes positive for mole fractions of thiophene > 0.62 and Δn increases with an increase in temperature. The Redlich-Kister smoothing equation was used successfully for the correlation of V E and Δn data. The Lorentz- Lorenz equation gave a poor prediction of V E , but a good prediction of density or refractive index.

scholarly journals Molar Interactions of Some Aromatic Hydrocarbons in n-Heptane by Viscometric Measurements at 298.15K

2018 ◽  
Vol 40 (1) ◽  
pp. 97-110
Author(s):  
Md Kamrul Hossain ◽  
M Abdur Rahaman ◽  
Shamim Akhtar
Keyword(s):  
Free Energy ◽  
Aromatic Hydrocarbons ◽  
Binary Systems ◽  
Composition Range ◽  
The Other ◽  
Excess Gibbs Free Energy ◽  
Geometric Fitting ◽  
Free Energy Of Activation ◽  
Three Body ◽  
Kister Equation

The viscosities, η , of pure n-heptane, toluene, o-xylene, mesitylene, and some of their binary mixtures covering the whole composition range have been measured at 298.15K. Deviations in viscosity, ∆η , was calculated using experimental results. The concentration dependencies of η were correlated to polynomial expressions, whereas, ∆η were fitted to the Redlich–Kister equation. Moreover, the values of the excess Gibbs free energy of activation, ∆G#E, of these mixtures were determined. Viscosity measurements of the binary systems were correlated with Grunberg and Nissan the three-body and four-body McAllister expressions. In all systems, ∆η were found to be negative in the whole range of composition with a single lobe having minimum at 0.6 mple fraction of aromatic hydrocarbon. While dispersive forces are suggested to dominate in n-heptane + toluene, for the other two systems  ‘favourable geometric fitting’ overpowers them due to the increasing number of  – CH3 groups in the relevant aromatic hydrocarbons. The Chittagong Univ. J. Sci. 40 : 97-110, 2018

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