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1
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Anisotropy of the Diamagnetic Susceptibility in 3,5-dibromo-p-amino and 3,5-dibromo-p-hydroxybenzoic Acids

100%
Abdel-Kader M.
Acta Physica Polonica A
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1992
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vol. 82
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issue 3
407-411
EN
The mean molar susceptibility (χ_{M}) for the two compounds 3,5-dibromo-p-aminobenzoic acid, Br_{2}C_{6}H_{2}(p-NH_{2})COOH, and 3,5-dibromo-p-hydroxybenzoic acid, Br_{2}C_{6}H_{2}(p-OH)COOH, has been determined. The principal molecular susceptibilities K^{∥} and K^{⊥} have been evaluated. The magnetic anisotropy of each of the two compounds was obtained. From the atonic coordinates, as given by the X-ray structure analysis of Br_{2}C_{6}H_{2}(p-NH_{2})COOH, the crystal susceptibilities (χ_{a}, χ_{b}, and χ_{c}) have been calculated. The magnetic properties are interpreted in the light of the crystal structure.
2
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Physical Studies of Binary Mesophase Mixtures Containing N-(p-Propoxy Benzylidene)-p-Pentylaniline

63%
Ranga Reddy R. N. V., Reddy K. C., Murthy V. R.
Acta Physica Polonica A
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1994
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vol. 86
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issue 3
385-391
EN
The applicability of the modified Lippincott δ-function model method is tested for binary mesophase mixtures. Using this method, the polarizabilities, polarizability anisotropies and order parameters of binary mesophase mixtures containing N-(p-propoxy-benzylidene)-p-pentylaniline are evaluated and compared with the reported values. A close agreement is observed between the estimated values and reported values.
3
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Electric Polarization of Onsager Fluids. I. Dipole Polarization. 1. Electric Moments of Free Molecules

63%
Prezhdo V., Tarasova G., Prezhdo O., Tyurin S., Akulova O., Kurskaya T.
Acta Physica Polonica A
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1993
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vol. 84
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issue 2
253-258
EN
An attempt was made to modify the model Onsager theory. A polarizable molecular dipole enclosed in a spherical cavity is substituted for a rigid one submerged in the polarizable medium which fills the cavity. The local dielectric permittivity of the Heaviside type is replaced for the oscillating, rapidly damping function of the Fresnel integral. The analytical expressions deduced allow to estimate dipoles of free molecules, starting from the results of dielectrometry of polar fluids. The obtained values are as close as possible to the experimental data on a great variety of pure organic liquids.
4
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Electro-Optical Kerr Effect Measurements in Conducting Systems

63%
Prezhdo O., Khaschina M., Novikov Y., Prezhdo V.
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vol. 96
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issue 3-4
341-352
EN
A new method of investigation of electro-optical properties of conducting media is proposed based on a contactless scheme for capacitance measurements. Using alternating electric current, the method is applied to study Kerr effect in a series of single and multi-component conducting liquid systems.
5
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Electric Polarization of Onsager Fluids. I. Dipole Polarization. 3. The Role of Universal Pairwise Interactions

63%
Prezhdo V. V., Tarasova G. V., Prezhdo O. V., Τyurin S. A., Ivanov N. I., Kurskaya T. N.
Acta Physica Polonica A
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1995
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vol. 88
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issue 3
419-434
EN
A comparative study of the methods of interpretation of solvent influences on electric properties of molecules was conducted based on experimental dielectric properties of dilute solutions of organic substances of various polarity. It was shown that the solvent effect estimated via London-Debye-Keesom pairwise interaction potentials is best accounted for by theories of polarization of condense media which develop the anzatzes of reactive field and local dielectric permittivity.
6
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Electric Polarization of Onsager Fluids. 1. Dipole Polarization. 2. Binary Solutions of Organic Compounds

63%
Prezhdo V., Tyurin S., Prezhdo O., Tarasova G., Akulova O., Kurskaya T.
Acta Physica Polonica A
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1994
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vol. 85
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issue 3
509-515
EN
Set forth in the previous report [1], the continual theory of dipole polarization of molecular fluids, which suggests substitution of the rigid Onsager sphere for the polarizable body and takes into consideration electric induction of this body and its nearest surroundings, is extended in this paper to binary solutions with diverse polarities. Dipole moments of free molecules of dissolved substances were calculated from experimental data of dielectrometry of a large number of extremely diluted organic substances and are close to the corresponding gaseous phase values. On the ground of solution polarization measurements the criterion of physical consistency of various models of the condensed medium internal field is proposed.
7
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Dielectric Study of Dipolar Association in Dihalogenobenzenes

51%
Dutkiewicz M.
Acta Physica Polonica A
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1992
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vol. 82
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issue 3
443-449
EN
The nonlinear dielectric effect (NDE) has been studied in o-bromochlorobenzene and m-bromochlorobenzene, and their solutions in benzene. On the basis of NDE results and the values of electric permittivity ε, density d, and refractive index n obtained in this work, the molar polarizabilities: linear ⟨μ^{2}⟩ and nonlinear ⟨μ^{4}⟩ were calculated. Assuming dipolar association of the investigated dihalogenobenzenes molecules to be restricted to dimerization, the Gibbs energy ΔG^{0}_{dim} of the dimerization process as a function of the Onsager field factor f(ε) is determined, which allowed us to draw a conclusion on the structure of associates.
8
Content available remote

Temperature Studies of Optical Birefringence in Molecular Liquids. I. Liquids with Linear Temperature Dependence

51%
Błaszczak Z., Doiari A.
Acta Physica Polonica A
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1992
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vol. 81
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issue 4-5
475-484
EN
We report the first systematic study of the temperature dependence of optically induced birefringence in benzene, toluene, nitrobenzene, chlorobenzene, 2-bromoanisole, 2-methylbenzaldehyde, 3-methylbenzaldehyde, 3-chlorobenzaldehyde and cinnamaldehyde. The optical Kerr constants, relative to benzene, are measured in a broad temperature range. Refractive indices and densities of the liquids for the temperatures studied were also determined. For the above liquids the T^{-1} temperature dependences of the optical Kerr constants have been found. From our measurements, the molar Kerr constants and the effective molecular anisotropies were calculated as functions of temperature. The mean values of the second-order optical hyperpolarizability have also been determined.
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