Dielectric Constants of Dilute Solutions of Polar Liquids in Nonpolar Solvents

1928 ◽  
Vol 31 (4) ◽  
pp. 653-671 ◽  
Author(s):  
J. D. Stranathan
Keyword(s):  
Dielectric Constants ◽  
Dilute Solutions ◽  
Polar Liquids ◽  
Nonpolar Solvents

A pulse radiolysis study of solvated electrons in dilute solutions of polar liquids in nonpolar solvents

1977 ◽  
Vol 55 (11) ◽  
pp. 1996-2002 ◽  
Author(s):  
J. H. Baxendale
Keyword(s):  
Absorption Spectra ◽  
Pulse Radiolysis ◽  
Electron Pulse ◽  
Pulse Irradiation ◽  
Dilute Solutions ◽  
Solvated Electrons ◽  
Polar Liquids ◽  
Tert Butanol ◽  
Nonpolar Solvents ◽  
Existence Of Equilibria

Measurements of the conductivities following electron pulse irradiation of dilute solutions of ethanol, n-propanol, tert-butanol, or dimethyl sulphoxide in n-hexane, cyclohexane, or i-octane are quantitatively consistent with the existence of equilibria between electrons in the hydrocarbon and electrons solvated by dimers of the polar molecules. With dimethylformamide solutions in alkanes the equilibrium could be with the monomeric anion of the solute but this assignment is not unequivocal. Absorption spectra of es− in n-hexane solutions of ethanol and of tert-butanol have been obtained.

Relaxation processes of some simple aliphatic molecules in dilute solutions

1977 ◽  
Vol 55 (4) ◽  
pp. 297-301 ◽  
Author(s):  
M. P. Madan
Keyword(s):  
Carbon Tetrachloride ◽  
Dielectric Relaxation ◽  
Thermodynamic Parameters ◽  
Relaxation Times ◽  
Relaxation Processes ◽  
Dilute Solutions ◽  
Microwave Region ◽  
Nonpolar Solvents ◽  
Dielectric Data ◽  
Intramolecular Rotation

The dielectric relaxation processes of acetone, cyclohexanone, 4-methyl-2-pentanone, and 4-heptanone in dilute nonpolar solvents, n-heptane, cyclohexane, benzene, and carbon tetrachloride have been studied in the microwave region over a temperature range 10 to 60 °C. The relaxation times and the thermodynamic parameters for the activated states have been determined using the measured dielectric data. The results have been discussed in terms of dipole reorientation by molecular and intramolecular rotation and compared, wherever possible, with other similar studies on aliphatic molecules.

scholarly journals Poly (Dimethylsiloxane) Coating for Repellency of Polar and Non-Polar Liquids

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2423
Author(s):  
Hila Monder ◽  
Leo Bielenki ◽  
Hanna Dodiuk ◽  
Anna Dotan ◽  
Samuel Kenig
Keyword(s):  
Contact Angle ◽  
Empirical Model ◽  
Room Temperature ◽  
Contact Angle Hysteresis ◽  
Dielectric Constants ◽  
Solubility Parameters ◽  
Polar Liquids ◽  
The Difference ◽  
Liquid Repellency ◽  
Pdms Coating

The wettability of poly (dimethylsiloxane) (PDMS) coating on plasma-treated glass was studied at room temperature using polar and non-polar liquids. The wettability was investigated regarding the liquids’ surface tensions (STs), dielectric constants (DCs) and solubility parameters (SPs). For polar liquids, the contact angle (CA) and contact angle hysteresis (CAH) are controlled by the DCs and non-polar liquids by the liquids’ STs. Solubility parameter difference between the PDMS and the liquids demonstrated that non-polar liquids possessed lower CAH. An empirical model that integrates the interfacial properties of liquid/PDMS has been composed. Accordingly, the difference between the SPs of PDMS and the liquid is the decisive factor affecting CAH, followed by the differences in DCs and STs. Moreover, the interaction between the DCs and the SPs is of importance to minimize CAH. It has been concluded that CAH, and not CA, is the decisive attribute for liquid repellency of PDMS coating.

Universal nomograms for measurement of UHF dielectric constants of polar liquids

1975 ◽  
Vol 18 (2) ◽  
pp. 294-296
Author(s):  
R. M. Kasimov ◽  
S. M. Useinova
Keyword(s):  
Dielectric Constants ◽  
Polar Liquids

Importance of the Debye interaction in organic solutions: Henry's law constants for polar liquids in nonpolar solvents and vice versa

1986 ◽  
Vol 15 (8) ◽  
pp. 693-703 ◽  
Author(s):  
J. Howard Rytting ◽  
Danny R. McHan ◽  
Takeru Higuchi ◽  
David J. W. Grant
Keyword(s):  
Henry's Law ◽  
Polar Liquids ◽  
Henry’S Law ◽  
Nonpolar Solvents ◽  
Henry’S Law Constants ◽  
Organic Solutions ◽  
Henry's Law Constants

Dielectric constant measurements of thin films and liquids using terahertz metamaterials

RSC Advances ◽  
2016 ◽  
Vol 6 (73) ◽  
pp. 69381-69386 ◽  
Author(s):  
S. J. Park ◽  
S. A. N. Yoon ◽  
Y. H. Ahn
Keyword(s):  
Thin Films ◽  
Dielectric Constant ◽  
Polymer Films ◽  
Dielectric Constants ◽  
Polar Liquids ◽  
Terahertz Metamaterials

In this paper, we demonstrate that terahertz (THz) metamaterials are powerful tools for determination of dielectric constants of polymer films and polar liquids.

scholarly journals An Empirical Relation for the Evaluation of the Dielectric Relaxation Time of Certain Polar Liquids Using a Single Microwave Frequency

1974 ◽  
Vol 27 (1) ◽  
pp. 87 ◽  
Author(s):  
BS Sarma ◽  
V Venkateswara Rao
Keyword(s):  
Experimental Data ◽  
Relaxation Time ◽  
Dielectric Relaxation ◽  
Concentration Factor ◽  
Empirical Relation ◽  
Microwave Frequency ◽  
Dielectric Constants ◽  
Dielectric Relaxation Time ◽  
Polar Liquids

An empirical relation is proposed for the determination of the dielectric relaxation time .. of polar liquids with nearly spherical molecules from measurements of the dielectric constants at a single microwave frequency. The relation is obtained by introducing a concentration factor as a parameter in the expression for .. derived by Eyring et al. (1941). Its validity for suitable polar liquids is demonstrated by comparison of results with previously reported values. Thermodynamic parameters for a number of liquids at various concentrations have also been evaluated from experimental data using the relation.

The effect of solvents on the oxidation of butyraldehyde catalysed by ferrocene

1981 ◽  
Vol 46 (1) ◽  
pp. 201-218 ◽  
Author(s):  
Jaroslav Včelák
Keyword(s):  
Oxidation Rate ◽  
Kinetic Equations ◽  
Reaction Medium ◽  
Solvent Polarity ◽  
Dielectric Constants ◽  
Effect Of Solvents ◽  
Nonpolar Solvents ◽  
Similar Dependence ◽  
Donor Ability ◽  
Solubility Of Oxygen

Oxidation of butyraldehyde to butyric acid catalysed by ferrocene in 10 solvents has been described by kinetic equations for autocatalysis. Rate constants of these equations were correlated with the properties of solvents. The oxidation rate was found to be independent of viscosity and fluidity of the reaction medium, electrophilicity expressed by ETfunction and the donor ability of solvents. Only in nonpolar solvents the oxidation rate depended on (nD)-2s. The rate of the title oxidation reaction was dependent on the polarity of reaction medium which was characterized by dipole moment and by functions of dielectric constants and increased with increasing solvent polarity. A similar dependence was also obtained with the use of solubility parameter and cohesion pressure of solvents. The rate of the oxidation increase with increasing solubility of oxygen in solvents. These dependences were used to discuss some steps of the mechanism of this oxidation.

scholarly journals Dipole moments and molecular structure. Part I.— A simple resonance method for the measurement of dielectric constants

1932 ◽  
Vol 136 (829) ◽  
pp. 251-255 ◽  
Keyword(s):  
Molecular Structure ◽  
Dipole Moment ◽  
Dipole Moments ◽  
Resonance Method ◽  
Dielectric Constants ◽  
Present Communication ◽  
Dilute Solutions ◽  
Resonance Circuit ◽  
Low Resistance ◽  
Voltage Resonance

Numerous types of resonance methods for the measurement of dielectric constants have been described by different investigators. That detailed in the present communication has no claim to originality, but it is a simple, whilst at the same time reliable, form, which has proved to be very useful for the measurement of the dielectric constants of dilute solutions for the purpose of dipole moment determination. A fairly powerful oscillator is used, enabling the valveless resonance circuit to be some distance removed from it, whilst still receiving ample “pick-up” for the measurements. Resonance in the pick-up circuit is detected by means of a low-resistance thermo-junction, introduced directly into the circuit. The resistance thus introduced does not damp the oscillation unduly. The very small conductivity of the solvent liquids employed does not produce any appreciable error owing to the current resonance not occurring at the same tuning capacity as the voltage resonance.

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