Temat: polarizability - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Green tensor in material sciences
Greenů v tenzor v materiálových vědách
Autorzy:: Vlcek, J.
Otipka, P.
Powiązania:: https://bibliotekanauki.pl/articles/112919.pdf
Data publikacji:: 2017
Wydawca:: STE GROUP
Tematy:: anisotropy
effective medium
polarizability tensor
Green tensor
anizotropia
tensor polaryzowalności
tensor Greena
Opis:: Material properties of heterogeneous nanomaterials modelled by effective medium approximation (EMA) demand specific approaches when metallic inclusions in a host medium are exposed to external magnetic field. Resulting induced anisotropy of permittivity is manifested itself by a specific form of polarizability tensor. In presented work, this one is applied in the so called “strong-couple-dipole” (SCD) method, where the electromagnetic Green tensor is of key importance. The results are oriented to the magneto-plasmonic sensor element design for the use in biology or chemistry.
Modelování materiálových vlastnosti heterogenních nanomateriálu metodou aproximace efektivním prostredím (EMA) vyžaduje specifický prístup, jsou-li kovové cástice v obklopujícím prostredí vystaveny magnetickému poli. Výsledná indukovaná anizotropie permitivity se projevuje specifickou formou tenzoru polarizovatelnosti. Ten je v této práci aplikován prostrednictvím tzv. metody silne vázaných dipólu (SCD), kde se klícovým zpusobem uplatnuje Greenuv (elektromagnetický) tenzor. Výsledky smerují k návrhu magneto-plasmonického senzoru s užitím v bilogii a chemii.
Źródło:: Systemy Wspomagania w Inżynierii Produkcji; 2017, 6, 4; 334-341
2391-9361
Pojawia się w:: Systemy Wspomagania w Inżynierii Produkcji
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Elektrooptyczny efekt Kerra w chemii
Electrooptic Kerr effect in chemistry
Autorzy:: Prezhdo, O.
Olan, K.
Zubkowa, W.
Preżdo, W.
Powiązania:: https://bibliotekanauki.pl/articles/171825.pdf
Data publikacji:: 2011
Wydawca:: Polskie Towarzystwo Chemiczne
Tematy:: elektrooptyczny efekt Kerra
analiza konformacyjna
wewnątrzcząsteczkowe oddziaływania
oddziaływania wewnątrzcząsteczkowe
oddziaływania międzycząsteczkowe
polaryzowalność
moment dipolowy
stała Kerra
electro-optical Kerr effect
conformational analysis
intra-molecular interactions
intermolecular interactions
polarizability
dipole moment
Kerr constant
Opis:: The electro-optical Kerr effect finds wide application in conformational analysis of molecules and molecular aggregates [1–5], particularly in cases where the standard X-ray and NMR techniques cannot be used. For instance, NMR allows to establish conformations of linear and cyclic unsaturated organic compounds. However, it is less effective in an analysis of molecular complexes, particularly of those that have several rotational symmetry axes. In such cases a combination of techniques based on molecular dipole moments, electro-optical Kerr effect, optical Kerr effect, IR spectroscopy, and Rayleigh scattering can be applied [6]. The foundations of conformational analysis of molecular complexes using several complementary physical approaches are developed in Ref. [7]. The electro-optical methods are particularly useful for an investigation of intramolecular interactions [8–18]. The strength, direction and other details of intramolecular interactions can be determined by analyzing the deviations of the experimental molar Kerr constant (mK) from its value calculated according to the tensor-additive scheme that operates with polarizability tensors of molecular cores and functional groups [19, 20]. For instance, using this approach it has been shown that weakening of conjugation in an electron donor-acceptor chain can lead to flattening of the molecular structure [21]. The Kerr constant is also very sensitive to intermolecular interactions [22–29]. In order to assess quantitatively an extent of the solvent effect on the mK values, both molecular and continuum models of solution structure have been used [30, 31]. The mK values are greatly affected by the mutual orientation of solvent and solute molecules, which interact by dispersive, inductive and dipole-dipole forces [32]. Hydrogen and donor-acceptor bonding have an even stronger influence on the mK values [33]. The equimolar mixtures approach developed in Ref. [34] allows to determine the molar Kerr constant (mK), dipole moment (m), equilibrium constant (K) and, ultimately, structure of a molecular complex based on measurements of the Kerr constant (B), dielectric permittivity (e), density (d) and refractive index (n) of a series of dilute solutions of the complex. Future trends in the development of the electro-optical methods in chemistry are discussed. Theories that relate the electric-optic proprieties of molecules with their reactivity are particularly important. Such theories should be able to predict the changes in the polarizabilities and dipole moments of bonds, molecules and molecular aggregates during the course of chemical reactions.
Źródło:: Wiadomości Chemiczne; 2011, 65, 1-2; 1-31
0043-5104
2300-0295
Pojawia się w:: Wiadomości Chemiczne
Dostawca treści:: Biblioteka Nauki

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