Dielectric constant, refractive index, atomic polarization, and dipole moment derivatives of hexamethylenetetramine‐h12 and ‐d12

1974 ◽  
Vol 61 (5) ◽  
pp. 1678-1679 ◽  
Author(s):  
John E. Bertie ◽  
Marco Solinas
Keyword(s):  
Dielectric Constant ◽  
Refractive Index ◽  
Dipole Moment ◽  
Atomic Polarization ◽  
Derivatives Of ◽  
Constant Refractive Index

The Oil Resistance of Rubber. II. Molecular Polarization and Dipole Moment of Purified Natural Rubber

1936 ◽  
Vol 9 (2) ◽  
pp. 296-300
Author(s):  
Shû Kambara
Keyword(s):  
Dielectric Constant ◽  
Refractive Index ◽  
Dipole Moment ◽  
Natural Rubber ◽  
Dipole Moments ◽  
Molecular State ◽  
True Value ◽  
Order Of Magnitude ◽  
Ether Solution ◽  
Constant Refractive Index

Abstract Natural rubber was purified by Pummerer's method and was dissolved in benzene and ether. The dielectric constant, refractive index, density, and concentration of the solutions were determined. From these data, the molecular polarization and dipole moment were calculated on the assumption that the rubber was dissolved in a molecular state of (C5H8)8. The dipole moments of total and gel rubber were found to be 2.45 and 2.91 × 10−18, respectively. These values are of the same order of magnitude as those of masticated crude rubber obtained by Ostwald. It may be said that the impurities of rubber are interlocked mechanically on the rubber molecule and are not combined chemically. Sol rubber in ether solution shows a far lower value than the values of total and gel rubber. These latter values may be influenced by autoöxidation, and the true value of the rubber hydrocarbon may be far smaller than the result described in this paper.

Temperaturabhängigkeit der statischen Dielektrizitätskonstante und des optischen Brechungsindexes von Flüssigkeiten

1975 ◽  
Vol 30 (3) ◽  
pp. 287-291 ◽  
Author(s):  
I. Gryczyński ◽  
A. Kawski
Keyword(s):  
Dielectric Constant ◽  
Refractive Index ◽  
Dipole Moment ◽  
Dipole Moments ◽  
Mixed Solvents ◽  
Temperature Changes ◽  
Temperature Dependences ◽  
Solvent Shifts ◽  
Pure And Mixed Solvents ◽  
Good Agreement

A variation of the temperature changes the static dielectric constant (ε) and the refractive index (n) of solvents and, in conjunction with the measurement of solvent shifts of absorption and fluorescence maxima, allows the investigation of dipole moment changes of solutes in the excited state. For this purpose, investigations of the temperature dependences of ε and n of some pure and mixed solvents of different polarities have been made. It is found that the excited dipole moments of indole, 1,2-dimethylindole, 2,3-dimethylindole and tryptophan obtained from the shifts of the fluorescence maxima in mixed solvents at high temperatures are in good agreement with those obtained in other ways.

scholarly journals Manufacturing and investigation of physical properties of polyacrylonitrile nanofibre composites with SiO2, TiO2 and Bi2O3 nanoparticles

2016 ◽  
Vol 7 ◽  
pp. 1141-1155 ◽  
Author(s):  
Tomasz Tański ◽  
Wiktor Matysiak ◽  
Barbara Hajduk
Keyword(s):  
Dielectric Constant ◽  
Refractive Index ◽  
Physical Properties ◽  
Band Gap ◽  
Electrospinning Process ◽  
Nanocomposite Polymer ◽  
Dispersion Of Nanoparticles ◽  
Gap Width ◽  
Band Gap Width ◽  
Constant Refractive Index

The aim of this study was to produce nanocomposite polymer fibres, consisting of a matrix of polyacrylonitrile (PAN) and a reinforcing phase in the form of SiO2/TiO2/Bi2O3 nanoparticles, by electrospinning the solution. The effect of the nanoparticles and the electrospinning process parameters on the morphology and physical properties of the obtained composite nanofibres was then examined. The morphology of the fibres and the dispersion of nanoparticles in their volume were examined using scanning electron microscopy (SEM). All of the physical properties, which included the band gap width, dielectric constant and refractive index, were tested and plotted against the concentration by weight of the used reinforcing phase, which was as follows: 0%, 4%, 8% and 12% for each type of nanoparticles. The width of the band gap was determined on the basis of the absorption spectra of radiation (UV–vis) and ellipsometry methods. Spectroscopic ellipsometry has been used in order to determine the dielectric constant, refractive index and the thickness of the obtained fibrous mats.

Infrared Intensities of Liquids XV: Infrared Refractive Indices from 8000 to 350 cm−1, Absolute Integrated Intensities, Transition Moments, and Dipole Moment Derivatives of Methanol-d, at 25°C

1994 ◽  
Vol 48 (2) ◽  
pp. 176-189 ◽  
Author(s):  
John E. Bertie ◽  
Shuliang L. Zhang
Keyword(s):  
Refractive Index ◽  
Dipole Moment ◽  
Molecular Properties ◽  
Refractive Indices ◽  
The Real ◽  
Transition Moments ◽  
Refractive Index Spectrum ◽  
Integrated Intensities ◽  
Derivatives Of ◽  
Real Refractive Index

This paper reports infrared absorption intensities of liquid methanol- d, CH3OD, at 25°C, between 8000 and 350 cm−1 Measurements were made by multiple attenuated total reflection spectroscopy with the use of the CIRCLE cell, and by transmission spectroscopy with a variable-path-length cell with CaF2 windows. The results of these two methods agree excellently and were combined to yield an imaginary refractive index spectrum, k(ν˜) vs. ν˜, between 6187 and 350 cm−1. The imaginary refractive index spectrum was arbitrarily set to zero between 6187 and 8000 cm−1 where k is always less than 2 × 10−6, in order that the real refractive index can be calculated below 8000 cm−1 by Kramers-Krönig transformation. The results are reported as graphs and as tables of the real and imaginary refractive indices between 8000 and 350 cm−1, from which all other infrared properties of liquid methanol- d can be calculated. The accuracy is estimated to be ± 3% below 5900 cm−1 and ± 10% above 5900 cm−1 for the imaginary refractive index and better than ± 0.5% for the real refractive index. In order to obtain molecular information from the refractive indices, the spectrum of the imaginary polarizability multiplied by wavenumber, ν˜ vs. ν˜, was calculated under the assumption of the Lorentz local field. The area under this ν˜ spectrum was separated into the integrated intensities of different vibrations. Molecular properties were calculated from these integrated intensities—specifically, the transition moments and dipole moment derivatives of the molecules in the liquid, the latter under the harmonic approximation. The availability of the spectra of both CH3OH and CH3OD enables the integrated intensities and the molecular properties of the C-H, O-H, O-D, and C-O stretching and CH3 deformation vibrations to be determined with confidence to a few percent. Further work with isotopic molecules is needed to improve the reliability of the integrated intensities of the C-O-H(D) in-plane bending, H-C-O-H(D) torsion, and CH3 rocking vibrations.

Propriétés physiques et basicité de l'oxydipropionitrile

1984 ◽  
Vol 62 (2) ◽  
pp. 361-362 ◽  
Author(s):  
Jean-Claude Bollinger ◽  
Germaine Yvernault ◽  
Théophile Yvernault ◽  
Raymond Houriet
Keyword(s):  
Dielectric Constant ◽  
Refractive Index ◽  
Dipole Moment ◽  
Chemical Shift ◽  
Gas Phase ◽  
Solubility Parameter ◽  
Donor Number ◽  
Proton Chemical Shift ◽  
Acid Base ◽  
Propriétés Physiques

Physical constants (density, refractive index, viscosity, dielectric constant, dipole moment, solubility parameter) and some basicity parameters (donor number, proton chemical shift variation for CHCl3, gas phase basicity) have been determined for 3,3′-oxydipropionitrile (ODPN) at 25 °C. These results are compared with those for other usual solvents; they permit an explanation of its properties as a solvent for acid–base titrations, and the appearance of homohydrogen bonding in this medium.

scholarly journals The Effect of Annealing Temperature on Structural and Solid State Properties of Aluminium Zinc Oxide (AlZnO) Deposited by Chemical Bath technique

2021 ◽  
Vol 6 (1) ◽  
Keyword(s):  
Thin Films ◽  
Dielectric Constant ◽  
Grain Size ◽  
Refractive Index ◽  
Solid State ◽  
Annealing Temperature ◽  
Deposition Technique ◽  
X Ray ◽  
Different Characteristics ◽  
Constant Refractive Index

In this work, we studied the effect of annealing temperature on the structural and solid state properties of AlZnO thin films using Chemical bath deposition technique. The thin films grown was annealed at various temperatures of 100oC, 150oC to 200oC The morphological and structural properties were studied using XRD and SEM, while the optical properties were studied using UVVIS Spectroscopy from where the bad gap, dielectric constant, refractive index, extinction coefficient and optical conductivity were deduced from the theoretical equations.From the result, it is observed that there is effect of annealing temperature on these properties such that the grain size and x-ray characteristics depicted different characteristics at these various temperatures.

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