Excess volumes for ethanol + water mixtures at 10-K intervals from 278.15 to 338.15 K

1980 ◽  
Vol 33 (10) ◽  
pp. 2121 ◽  
Author(s):  
KN Marsh ◽  
AE Richards
Keyword(s):  
Infinite Dilution ◽  
Excess Volume ◽  
Composition Range ◽  
Maximum Density ◽  
Excess Volumes ◽  
Temperature Dependent ◽  
Molar Excess ◽  
A Value ◽  
Molar Excess Volume ◽  
Temperature Of Maximum Density

The excess volumes of mixtures of xA ethanol+ xB water have been measured at 10-K intervals from 278.15 to 338.15 K over the whole composition range, various dilution dilatometers being used. Particular attention has been paid to regions dilute in both ethanol and water. The partial molar excess volume of ethanol at infinite dilution in water is extremely temperature-dependent, becoming more negative as the temperature increases. The partial molar excess volume of ethanol in dilute solutions is very concentration-dependent at low temperatures but the dependence approaches zero at 362 K. At an xA value of 0.038, the partial molar excess volume of ethanol VEA is independent of temperature, having a value of -5.23 cm3 mol-1, while the excess volume VEA is independent of temperature at xA = 0.082, having a value of -0.420 cm3 mol-1. These unusual observations are explained in terms of the variation of the temperature of maximum density with composition for dilute ethanol solutions. At high mole fractions of ethanol the excess volume and the partial molar excess volume of water do not show unusual behaviour.

Phasendiagramme und Exzeßvolumina der Systeme (CH3)2SiCl2/Pyridin und (CH3)2CCl2/Pyridin / Phase Diagrams and Excess Volumes of the Systems (CH3)2SiCl2/Pyridine and (CH3)2CCl2/Pyridine

1994 ◽  
Vol 49 (3) ◽  
pp. 412-416
Author(s):  
Michael W. Zenke ◽  
Karl Hensen
Keyword(s):  
Molar Volume ◽  
Phase Diagrams ◽  
Excess Volume ◽  
Excess Volumes ◽  
Molar Excess ◽  
Molar Excess Volume

Abstract The isobaric melting and boiling diagrams for the systems: dimethyldichlorosilane/pyridine and 2,2-dichloropropane/pyridine are reproduced. The existence of the incongruently melting addition compounds (CH3)2SiCl2 · (Pyridine)2 and [(CH3)2CCl2]3 · Pyridine could be proved. Some measurements of the molar volume of mixtures of pyridine and dimethyldichlorosilane, and pyridine and 2,2-dichloropropane are reported. For both systems the molar excess volume has been calculated as a function of the mole fractions.

Thermodynamische Untersuchungen zur Lewis-Acidität von Trimethylchlorsilan - die Phasendiagramme und Exzeßvolumina der Systeme (CH3)3SiCl/Pyridin und (CH3)3CCl/Pyridin / Thermodynamic Examinations on the Lewis Acidity of Trimethylchlorosilane - the Phase Diagrams and Excess Volumes of the Systems (CH3)3SiCl/Pyridin and (CH3)3CCl/Pyridin

1994 ◽  
Vol 49 (6) ◽  
pp. 759-762 ◽  
Author(s):  
Michael W. Zenke ◽  
Karl Hensen
Keyword(s):  
Molar Volume ◽  
Phase Diagrams ◽  
Excess Volume ◽  
Excess Volumes ◽  
Lewis Acidity ◽  
Molar Excess ◽  
Molar Excess Volume

The isobaric melting and boiling diagrams for the systems: trimethylchlorosilane/pyridine and trimethylchloromethane/pyridine are reproduced. Some measurements of the molar volume of mixtures between trimethylchlorosilane and pyridine and trimethylchloromethane and pyridine are reported. For both systems the molar excess volume has been calculated as a function of the mole fractions

Pycnometric determination of densities and excess volumes of binary mixtures containing at least one associating component

1990 ◽  
Vol 55 (10) ◽  
pp. 2395-2403 ◽  
Author(s):  
Kamila Chýlková ◽  
Ivona Malijevská
Keyword(s):  
Acetic Acid ◽  
Propionic Acid ◽  
Binary Mixtures ◽  
Trifluoroacetic Acid ◽  
Excess Volume ◽  
Excess Volumes ◽  
Molar Excess ◽  
Molar Excess Volumes

Densities at 20 °C and molar excess volumes calculated from them are reported in the work for the mixtures of the substances: propionic acid-n-heptane, propionic acid-benzene, trifluoroacetic acid-benzene, propionic acid-cyclohexane, acetic acid-cyclohexane, acetic acid-trifluoroacetic acid, acetic acid-propionic acid, and propionic acid-trifluoroacetic acid. For the last system mentioned, a strange dependence of excess volume on composition was found which is noted for three local extremes. The dependences of excess volume on composition are correlated by the Redlich-Kister polynomial.

Excess volumes of toluene mixtures with some alcohols at 303.15 K

1980 ◽  
Vol 58 (3) ◽  
pp. 229-230 ◽  
Author(s):  
Goolla Narayana Swamy ◽  
Golla Dharmaraju ◽  
Gurajala Kodanda Raman
Keyword(s):  
Binary Mixtures ◽  
Excess Volume ◽  
Composition Range ◽  
Excess Volumes ◽  
Entire Composition Range ◽  
Dilatometric Method

Excess volumes for binary mixtures of toluene with 1-propanol, 2-propanol, 1-butanol, 2-methyl-1-propanol, 1-pentanol, 1-hexanol, 1-heptanol, and cyclohexanol have been measured as a function of composition at 303.15 K by a dilatometric method. The excess volume curves for 1-propanol and 1-butanol are sigmoid. For other alcohols VE values are positive over the entire composition range.

Comment: A problem in extracting structure information from the temperature of maximum density for aqueous solutions

1977 ◽  
Vol 55 (5) ◽  
pp. 798-799 ◽  
Author(s):  
James R. Kuppers
Keyword(s):  
Aqueous Solutions ◽  
Solution Structure ◽  
Maximum Density ◽  
Reference State ◽  
Temperature Dependent ◽  
Structure Information ◽  
Ideal State ◽  
Structural Contribution ◽  
Temperature Of Maximum Density ◽  
Temperature Dependent Properties

The shift in the temperature of maximum density for aqueous solutions customarily has been dissected into an ideal and a structural contribution. This analysis demonstrates that the dissection leads to the formulation of an ideal state which is attained by a fortuitous superposition of temperature dependent properties of pure components and, hence, cannot serve as a reliable reference state for comparing the influence of different solutes upon solution structure.

Molar Excess Volume ofsec- andtert-Butyl Chloride with Aromatic Hydrocarbons atT= 298.15 K

2007 ◽  
Vol 52 (5) ◽  
pp. 2083-2085 ◽  
Author(s):  
Naveen Verma ◽  
Sanjeev Maken ◽  
Bal Raj Deshwal ◽  
Krishan Chander Singh ◽  
Jin-Won Park
Keyword(s):  
Aromatic Hydrocarbons ◽  
Excess Volume ◽  
Butyl Chloride ◽  
Molar Excess ◽  
Molar Excess Volume

Excess volumes of binary mixtures of cyclohexanone with some monosubstituted benzenes at 298.15 K

1983 ◽  
Vol 61 (9) ◽  
pp. 2147-2150 ◽  
Author(s):  
B. Chawla ◽  
S. K. Mehta ◽  
R. V. Jasra ◽  
S. K. Suri
Keyword(s):  
Binary Mixtures ◽  
Molecular Interactions ◽  
Composition Range ◽  
Excess Volumes ◽  
Entire Composition Range ◽  
Density Data ◽  
Molar Excess ◽  
Monosubstituted Benzenes ◽  
Molar Excess Volumes ◽  
Experimental Density

Molar excess volumes for the binary mixtures of cyclohexanone with benzene and some monosubstituted benzenes, namely, toluene, ethylbenzene, isopropylbenzene, tertiary butylbenzene, chlorobenzene, bromobenzene, iodobenzene, N,N-dimethylaniline, nitrobenzene, benzaldehyde, and benzonitrile have been calculated from the precise and accurate experimental density data at 298.15 K over the entire composition range. The results have been discussed in terms of the strength of molecular interactions in the binary mixtures.

Thermodynamische Untersuchungen der Systeme Pyridin/CH3SiCl3 und Pyridin/Cl3CCH3 / Thermodynamic Examinations of the Systems Pyridine/CH3SiCl3 and Pyridine/Cl3CCH3

1993 ◽  
Vol 48 (8) ◽  
pp. 1127-1132
Author(s):  
Michael W. Zenke ◽  
Karl Hensen
Keyword(s):  
Molar Volume ◽  
Excess Volume ◽  
Addition Compound ◽  
Molar Excess ◽  
Congruently Melting ◽  
Molar Excess Volume

The isobaric melting and boiling diagrams for the systems: pyridine/methyltrichlorosilane and pyridine/1,1,1-trichloroethane are reproduced. The existence of the congruently melting addition compound CH3SiCl3· (Pyridin)2 could be confirmed. Some measurements of the molar volume of mixtures between pyridine and methyltrichlorosilane and pyridine and 1,1,1-trichloroethane, respectively, are reported. For both systems the molar excess volume and for the system pyridine/methyltrichlorosilane the molar excess enthalpie have been calculated as a function of the mole fractions.

scholarly journals Temperature Dependence of G and D’ Phonons in Monolayer to Few-Layer Graphene with Vacancies

2020 ◽  
Vol 15 (1) ◽  
Author(s):  
Mingming Yang ◽  
Longlong Wang ◽  
Xiaofen Qiao ◽  
Yi Liu ◽  
Yufan Liu ◽  
...  
Keyword(s):  
Negative Temperature Coefficient ◽  
Negative Temperature ◽  
Intrinsic Properties ◽  
Temperature Dependent ◽  
Phonon Interaction ◽  
Electron Phonon Interaction ◽  
Layer Graphene ◽  
A Value ◽  
Few Layer Graphene

Abstract The defects into the hexagonal network of a sp2-hybridized carbon atom have been demonstrated to have a significant influence on intrinsic properties of graphene systems. In this paper, we presented a study of temperature-dependent Raman spectra of G peak and D’ band at low temperatures from 78 to 318 K in defective monolayer to few-layer graphene induced by ion C+ bombardment under the determination of vacancy uniformity. Defects lead to the increase of the negative temperature coefficient of G peak, with a value almost identical to that of D’ band. However, the variation of frequency and linewidth of G peak with layer number is contrary to D’ band. It derives from the related electron-phonon interaction in G and D’ phonon in the disorder-induced Raman scattering process. Our results are helpful to understand the mechanism of temperature-dependent phonons in graphene-based materials and provide valuable information on thermal properties of defects for the application of graphene-based devices.

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