The Dielectric Constants and Dipole Moments of Acetylenic Ethers

1944 ◽  
Vol 66 (4) ◽  
pp. 656-657 ◽  
Author(s):  
Thomas L. Jacobs ◽  
John D. Roberts ◽  
W. G. MacMillan
Keyword(s):  
Dipole Moments ◽  
Dielectric Constants

scholarly journals PEDOT:PSS in Water and Toluene for Organic Devices—Technical Approach

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 565 ◽  
Author(s):  
Beata Jewłoszewicz ◽  
Krzysztof A. Bogdanowicz ◽  
Wojciech Przybył ◽  
Agnieszka Iwan ◽  
Ireneusz Plebankiewicz
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Spin Coating ◽  
Surface Defects ◽  
Water Solution ◽  
Dipole Moments ◽  
Spray Coating ◽  
Dielectric Constants ◽  
Technical Parameters ◽  
Energy Bandgap

Poly(3,4-ethylenedioxythiophene:poly(styrenesulfonate) (PEDOT:PSS) water and toluene solutions were investigated in detail, taking into consideration their stability, wettability, transparency, and electrochemical properties, along with change polarity caused by dopant. As dopant, methanol, ethanol, and isopropanol were used with different dipole moments (1.70, 1.69, and 1.66 D) and dielectric constants (33.0, 24.5, and 18.0). Three techniques, i.e., spin coating, doctor blade coating, and spray coating, were employed to created PEDOT:PSS layers on glass, glass/indium tin oxide (ITO), and glass/fluorine-doped tin oxide (FTO) substrates with optimized technical parameters for each used equipment. All used PEDOT:PSS water and toluene solutions demonstrated good wetting properties with angles below 30° for all used surfaces. Values of the energy bandgap (Eg) of PEDOT:PSS investigated by cyclic voltammetry (CV) in solution showed increase energy Eg along with addition of alcohol to the mixture, and they were found in the range of 1.20 eV to 2.85 eV. The opposite tendency was found for the Eg value of the PEDOT:PSS layer created from water solution. The storage effect on PEDOT:PSS layers detected by CV affected only the lowest unoccupied molecular orbital (LUMO) level, thereby causing changes in the energy bandgap. Finally, simple devices were constructed and investigated by infrared (IR) thermographic camera to investigate the surface defects on the created PEDOT:PSS layers. Our study showed that a more stable PEDOT:PSS layer without pin-holes and defects can be obtained from water and toluene solutions with isopropanol via the spin coating technique with an optimal speed of 3000 rpm and time of 90 s.

The Dielectric Constants, Polarizations and Dipole Moments of Some Alkylbenzenes

1954 ◽  
Vol 58 (5) ◽  
pp. 392-395 ◽  
Author(s):  
Aubrey P. Altshuller
Keyword(s):  
Dipole Moments ◽  
Dielectric Constants

DIELECTRIC CONSTANTS OF LIQUID SULPHUR DIOXIDE, ETHYL CHLORIDE, AND ETHYLENE OXIDE

1957 ◽  
Vol 35 (11) ◽  
pp. 1325-1331 ◽  
Author(s):  
J. D. Nickerson ◽  
R. McIntosh
Keyword(s):  
Ethylene Oxide ◽  
Sulphur Dioxide ◽  
Dipole Moments ◽  
Dielectric Constants ◽  
Ethyl Chloride ◽  
Frequency Range ◽  
Liquid Sulphur

Dielectric constants of sulphur dioxide, ethyl chloride, and ethylene oxide have been measured over the frequency range 9 to 92 Mc./second and at temperatures between −35° and +20 °C. Dipole moments computed from the Debye, Onsager, and Kirkwood equations are reported and compared with the moments which are known from measurements on the gaseous substances.

scholarly journals Table of Dielectric Constants and Electric Dipole Moments of Substances in the Gaseous State

Physics Today ◽  
1954 ◽  
Vol 7 (6) ◽  
pp. 26-26
Author(s):  
Arthur A. Maryott ◽  
Floyd Buckley
Keyword(s):  
Electric Dipole ◽  
Dipole Moments ◽  
Dielectric Constants ◽  
Electric Dipole Moments ◽  
Gaseous State

Solubility of Sterigmatocystin

1974 ◽  
Vol 57 (1) ◽  
pp. 225-227
Author(s):  
Martin Steyn
Keyword(s):  
Dipole Moments ◽  
Dielectric Constants ◽  
Solubility Parameters

Abstract The solubility of sterigmatocystin, a carcinogenic and toxic mycotoxin, was determined in 48 solvents. The results indicated that with few exceptions, it is relatively insoluble in most solvents tested. There seemed to be no correlation between the solubility of sterigmatocystin and the dipole moments, dielectric constants, or solubility parameters of the solvents.

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.

Thermodynamic and physical behaviour of some water + polyethyleneglycol mixtures. II. Dielectric properties

1979 ◽  
Vol 57 (6) ◽  
pp. 608-613 ◽  
Author(s):  
Gérard Douhéret ◽  
Maurice Morénas
Keyword(s):  
Dielectric Properties ◽  
Composition Range ◽  
Dipole Moments ◽  
Partial Molar Volumes ◽  
Correlation Factor ◽  
Dielectric Constants ◽  
Treatment Results ◽  
Rich Region ◽  
Physical Behaviour ◽  
Water Lattice

Dielectric constants of water + glycol (mono-, di-, tri-, and tetraethyleneglycol) mixtures have been measured at 298.15 K over the entire composition range. The mixtures involving monoethyleneglycol have also been studied at temperatures from 308.15 to 288.15 K. Calculated deviations from ideality are always positive and show one maximum. Related properties have been computed: polarizability volume and excess polarizability volume, correlation factor of mixtures, and dipole moments of both components using the Mecke–Reuter treatment. Results support conclusions previously deduced from excess and partial molar volumes; they suggest that the addition of glycol molecules gives rise to a slight enhancement of the water-lattice in the water-rich region, followed by a progressive destructuring; the ether functions do not seem to play a prominent role.

Dielectric properties of hexafluoroacetone and hexachloroacetone

1969 ◽  
Vol 47 (12) ◽  
pp. 2253-2256 ◽  
Author(s):  
R. K. Chan
Keyword(s):  
Dipole Moment ◽  
Dielectric Properties ◽  
Liquid State ◽  
Dipole Moments ◽  
Dielectric Constants ◽  
Pure Liquid ◽  
Gaseous State ◽  
Vector Addition ◽  
Inductive Effects ◽  
Experimental Values

The dielectric constants of hexafluoro- and hexachloro-acetone are measured in the solid and liquid state. They show negligible association in the liquid state. The dipole moments are 0.648 D measured in the gaseous state and 0.63 D in pure liquid for hexafluoroacetone, and 1.24 D in carbon tetrachloride solution and 1.34 D in pure liquid for hexachloroacetone. If the differences between inductive effects due to CX3 and C=O groups can be ignored, the vector addition of bond moments gives values of dipole moment which are compatible with the experimental values.

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