A study on excess functions and thermodynamic parameters of some bromoform- containing binary mixtures

1990 ◽  
Vol 68 (2) ◽  
pp. 251-257 ◽  
Author(s):  
Shrikant S. Joshi ◽  
Tejraj M. Aminabhavi ◽  
Shyam S. Shukla
Keyword(s):  
Experimental Data ◽  
Refractive Index ◽  
Thermodynamic Parameters ◽  
Binary Mixtures ◽  
Partial Molar Volumes ◽  
Excess Functions ◽  
Gibbs Energy Of Activation ◽  
Isobaric Thermal Expansion ◽  
Isobaric Thermal Expansion Coefficient ◽  
Good Agreement

Densities and viscosities have been determined for six binary mixtures of bromoform, aniline, n-hexane, benzonitrile, butyronitrile, and benzylnitrile at different mole fractions and temperatures. The excess volumes VE, apparent excess values of viscosity δη, excess Gibbs energy of activation of flow ΔG*E, and partial molar volumes Vi have been calculated from the experimental data. Furthermore, attempts were made to calculate theoretically the excess isobaric thermal expansion coefficient δα, of the mixtures using the refractive index mixture rules. These results are in good agreement with the experimental data obtained from densities. Various excess functions and thermodynamic parameters have been used in the discussion of results to understand the nature and type of interactions in binary mixtures. Keywords: excess volume, refractive index mixture rules, interactions, bromoform, density, viscosity.

scholarly journals Thermodynamics and phase diagram calculation of the binary arsenic-tellurium system in the framework of the generalized lattice model

2021 ◽  
Vol 2052 (1) ◽  
pp. 012015
Author(s):  
N V Gerasimov ◽  
M A Zakharov
Keyword(s):  
Experimental Data ◽  
Phase Diagram ◽  
Thermodynamic Properties ◽  
Thermodynamic Parameters ◽  
Lattice Model ◽  
Binary Phase Diagram ◽  
Phase Diagram Calculation ◽  
Binary Phase ◽  
Good Agreement

Abstract In this work we describe how to efficiently calculate thermodynamic properties and T-x diagram of binary As-Te solution in the generalized lattice model. All the thermodynamic parameters of the As-Te solution are obtained within framework of the generalized lattice model. The binary phase diagram of As-Te system is calculated and good agreement with experimental data is obtained.

Temperature dependence of the viscosity of epoxy acrylate-tripropylene glycol diacrylate binary mixtures

e-Polymers ◽  
2015 ◽  
Vol 15 (6) ◽  
pp. 447-450 ◽  
Author(s):  
Fengguo Liu ◽  
Ying Wang ◽  
Xiangxin Xue ◽  
He Yang
Keyword(s):  
Experimental Data ◽  
Temperature Dependence ◽  
Binary Mixtures ◽  
Theoretical Basis ◽  
Epoxy Acrylate ◽  
Rotational Viscometer ◽  
Glycol Diacrylate ◽  
Ultraviolet Curable ◽  
Main Components ◽  
Good Agreement

AbstractEpoxy acrylate (EA) and tripropylene glycol diacrylate (TPGDA) are two main components of ultraviolet-curable coatings. In this study, the viscosity of EA-TPGDA binary mixtures at various mass ratios was measured by a rotational viscometer at temperatures between 298.15 and 313.15 K. The temperature dependence of the viscosity of the mixtures is discussed. An empirical correlation between the viscosity and the temperature was obtained based on the Andrade equation. The results indicated that the calculated viscosity values show a good agreement with experimental data. This will contribute to the evaluation of the rheological properties and provide a theoretical basis for the industrial application of coatings.

scholarly journals Calorimetric Computation of Enthalpy of Formation of Trisacetylacetonato Chromium(III) [Cr(C5H7O2)3(c)]

2019 ◽  
Vol 7 (1) ◽  
pp. 88-91
Author(s):  
Madhvendu Pathak ◽  
◽  
Raghvendu Pathak ◽  
Keyword(s):  
Experimental Data ◽  
Heat Capacity ◽  
Gibbs Energy ◽  
Thermodynamic Parameters ◽  
Enthalpy Of Formation ◽  
Organometallic Compounds ◽  
Enthalpy Of Combustion ◽  
Present Communication ◽  
Good Agreement

From thermochemical studies of organometallic compounds, a host of thermodynamic parameters viz., heat capacity, entropy, Gibbs energy etc., can be evaluated. The present communication deals with the evaluation of enthalpy of combustion and thereby estimation of enthalpy of formation of crystalline trisacetylacetonato chromium(III) [Cr (C5H7O2)3 (c)] or [Cr (acac)3 cH) and enthalpy of formation fH° –1 –1 respectively. Experimental data obtained are in good agreement with one another.

scholarly journals Viscosities and refractive indices of binary systems acetone+1-propanol, acetone+1,2-propanediol and acetone+1,3-propanediol

2014 ◽  
Vol 20 (3) ◽  
pp. 441-455 ◽  
Author(s):  
Emila Zivkovic ◽  
Mirjana Kijevcanin ◽  
Ivona Radovic ◽  
Slobodan Serbanovic
Keyword(s):  
Experimental Data ◽  
Refractive Index ◽  
Binary Mixtures ◽  
Atmospheric Pressure ◽  
Binary Systems ◽  
Refractive Indices ◽  
Mixing Rules ◽  
Viscosity Deviations ◽  
Kister Equation

Viscosities and refractive indices of three binary systems, acetone+1-propanol, acetone+1,2-propanediol and acetone+1,3-propanediol, were measured at eight temperatures (288.15, 293.15, 298.15, 303.15, 308.15, 313.15, 318.15, 323.15)K and at atmospheric pressure. From these data viscosity deviations and deviations in refractive index were calculated and fitted to the Redlich-Kister equation. The viscosity modelling was done by two types of models: predictive UNIFAC-VISCO and ASOG VISCO and correlative Teja-Rice and McAlister equations. The refractive indices of binary mixtures were predicted by various mixing rules and compared with experimental data.

scholarly journals Simulation the spectral dependence of the transmittance for semiconductor thin films

2020 ◽  
Vol 21 (1) ◽  
pp. 57-60 ◽  
Author(s):  
H. Il'chuk ◽  
A. Kashuba ◽  
R. Petrus ◽  
I. Semkiv ◽  
N. Ukrainets
Keyword(s):  
Thin Film ◽  
Experimental Data ◽  
Refractive Index ◽  
Spectral Dependence ◽  
Semiconductor Thin Films ◽  
Cadmium Chalcogenides ◽  
Film Substrate ◽  
Quartz Substrates ◽  
Theoretical Results ◽  
Good Agreement

The spectral dependence of the transmittance as a function of the film thickness, the refractive index of the substrate, bandgap and the Cauchy parameters (α and β) of the semiconductor material was determined from condition of interference extremes. The absorption coefficient was simulated for the structure – thin film/substrate. Cadmium chalcogenides (CdTe, CdSe, and CdS) deposited on quartz substrates was selected as model samples. Experimental behavior of substrate transmittance was used to determine its refractive index. The theoretical results are compared with the experimental data and shows good agreement.

Intrinsic Diffusivities and Modeling of the Diffusion Multiples

2008 ◽  
Vol 273-276 ◽  
pp. 105-112
Author(s):  
Marek Danielewski ◽  
Bartłomiej Wierzba
Keyword(s):  
Experimental Data ◽  
Partial Molar Volumes ◽  
Multicomponent Diffusion ◽  
Frame Of Reference ◽  
Calphad Approach ◽  
Diffusion Multiple ◽  
Fixed Frame ◽  
Multiphase Systems ◽  
Simulation Results ◽  
Good Agreement

In order to model the diffusion in multicomponent and multiphase systems we define and use the volume fixed frame of reference. In this unique frame all diffusion fluxes are expressed by the combined Darken-Nernst-Planck formulae. The components mobility is estimated using the NIST data and Calphad approach. The resulting CADiff method is used for the modeling (inter)diffusion process in the multicomponent diffusion multiple. We shows results for the IN718-Rene88 terminal compositions. Comparison of the simulation results with experimental data shows good agreement. The presented CADiff method allows to model interdiffusion in multicomponent non-ideal systems. When the thermodynamical data are available, the method allows to include reactions, variable partial molar volumes and effect of stress.

POLYNOMIAL FITTING APPROACH FOR THE KRAMERS–KRONIG METHOD FOR OPTICAL PROPERTIES COMPUTING FOR Bi2O3 FABRIC

2012 ◽  
Vol 26 (07) ◽  
pp. 1250049 ◽  
Author(s):  
GABRIEL MURARIU ◽  
SIMONA CONDURACHE-BOTA ◽  
NICOLAE TIGAU
Keyword(s):  
Experimental Data ◽  
Refractive Index ◽  
Optical Properties ◽  
Reflectance Spectrum ◽  
Optical Parameters ◽  
Thermal Vacuum ◽  
Data Set ◽  
Glass Substrates ◽  
Different Temperatures ◽  
Good Agreement

The optical reflectance of Bi 2 O 3 was measured, and the optical properties were estimated by Kramers–Kronig analysis. The novelty of the present study is due to the implementation of a MAPLE software approach to the complex computations implied by this extrapolation. The analytical fit of the reflectance spectrum is applied, accompanied by a careful extrapolation, which is necessary within the Kramers–Kronig method. In this way starting from the reflectance samples data, using this transformation, a very good agreement is obtained between the main optical parameters, namely the refractive index and the absorbtion coefficient. The study is implemented for Bi 2 O 3 films deposited by thermal vacuum evaporation at different temperatures of the glass substrates and the comparison with the experimental data set being made using the transmission and the reflection optical spectra.

scholarly journals Correlation and prediction of the physical and excess properties of the ionic liquid 1-butyl-3-methylimidazolium methyl sulphate with several alcohols at T= (298.15 to 313.15) K

2013 ◽  
Author(s):  
◽  
Sangeeta Singh
Keyword(s):  
Refractive Index ◽  
Ionic Liquid ◽  
Binary Mixtures ◽  
Binary Systems ◽  
Excess Molar Volumes ◽  
Partial Molar Volumes ◽  
Excess Properties ◽  
Excess Isentropic Compressibilities ◽  
Molar Volumes ◽  
Isentropic Compressibilities

The thermodynamic properties of binary liquid mixtures using an ionic liquid (IL) with alcohols were determined at different temperatures. The ionic liquid used was 1-butyl-3- methylimidazolium methylsulphate [BMIM]+[MeSO4]-. Densities, speed of sound, and refractive indices for the binary mixtures ([BMIM]+[MeSO4]- + methanol, or 1-propanol, or 2-propanol, or 1-butanol) were experimentally measured over the whole range of composition at T = (298.15, E 303.15, 308.15, and 313.15) K. From the experimental data, excess molar volumes, V m , E , deviations in refractive isentropic compressibilities, κ s , excess isentropic compressibilities, κ S indices, ∆n, and molar refractions, R, were calculated. The excess partial molar volumes were also calculated at T = 298.15 K. For the binary systems, ([BMIM]+[MeSO4]- + methanol, or 1-propanol, or 2-propanol, or E E E 1-butanol) V m and κ S are always negative and V m decrease slightly when the temperature increases. The refractive index deviation at T = (298.15, 303.15, 308.15, and 313.15) K is positive over the whole composition range. The measured negative values for excess molar volume of these mixtures ([BMIM]+[MeSO4]- + methanol, or 1-propanol, or 2-propanol, or 1-butanol) indicate strong ion-dipole interactions and packing between alcohols and IL are present. The Redlich-Kister smoothing polynomial equation was satisfactorily applied for the E E fitting of the V m , κ S , and ∆n data to give the fitting parameters and the root-mean-square deviations. The Lorentz-Lorenz (L-L) equation was also used to correlate the volumetric property and predict the density or refractive index of the binary mixtures of ionic liquid and the organic solvents. The Lorentz-Lorenz approximation gives a higher σ when used to correlate the iiiexcess molar volumes for the mixtures ([BMIM]+[MeSO4]- + methanol, or 1-propanol, or 2-propanol, or 1-butanol). The L-L equation gives good results for the prediction of density and refractive index. The results are discussed in terms of solute-solute, solute-solvent and solvent- solvent interactions.

scholarly journals Calculations of Light Scattering Matrix of Dust Aerosols for Problems of Lidar Remote Sensing

2020 ◽  
Vol 237 ◽  
pp. 08008
Author(s):  
Natalia Kustova ◽  
Alexander Konoshonkin ◽  
Anatoli Borovoi ◽  
Zhenzhu Wang ◽  
Dong Liu ◽  
...  
Keyword(s):  
Experimental Data ◽  
Remote Sensing ◽  
Refractive Index ◽  
Light Scattering ◽  
Scattering Matrix ◽  
Dust Particles ◽  
Exact Methods ◽  
Particle Orientations ◽  
Crucial Parameter ◽  
Good Agreement

The light scattering matrix is calculated for large dust particles with irregular shape and refractive index of 1.3116+i0.0. The scattering matrix in the backward direction needed for lidar studies is separately discussed. In this case, the obtained results for the lidar and depolarization ratios are in good agreement with experimental data. It is shown that for randomly oriented particles the number of particle orientations needed for numerical calculations by exact methods like DDA becomes a crucial parameter. In particular, for particles with size parameters larger than 40 the number of orientations should be more than 1000.

Energy Levels and Electromagnetic Transition of 90-94mo Nuclei Using Ibm-1

2020 ◽  
pp. 149-152
Keyword(s):  
Experimental Data ◽  
Transition Probability ◽  
Energy Levels ◽  
Dynamical Symmetry ◽  
Interacting Boson Model ◽  
Excitation Energies ◽  
Electromagnetic Transition ◽  
Boson Model ◽  
Energy States ◽  
Good Agreement

The energy states for the J , b , ɤ bands and electromagnetic transitions B (E2) values for even – even molybdenum 90 – 94 Mo nuclei are calculated in the present work of "the interacting boson model (IBM-1)" . The parameters of the equation of IBM-1 Hamiltonian are determined which yield the best excellent suit the experimental energy states . The positive parity of energy states are obtained by using IBS1. for program for even 90 – 94 Mo isotopes with bosons number 5 , 4 and 5 respectively. The" reduced transition probability B(E2)" of these neuclei are calculated and compared with the experimental data . The ratio of the excitation energies of the 41+ to 21+ states ( R4/2) are also calculated . The calculated and experimental (R4/2) values showed that the 90 – 94 Mo nuclei have the vibrational dynamical symmetry U(5). Good agreement was found from comparison between the calculated energy states and electric quadruple probabilities B(E2) transition of the 90–94Mo isotopes with the experimental data .

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