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New Method for Analysis of Liquid Crystal Elasticity

100%
Walczak A.
Acta Physica Polonica A
|
1998
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vol. 94
|
issue 5-6
803-812
EN
Orientational elastic constant k_{11}, k_{33} and k_{13} of liquid crystals are determined by a new way. Liquid crystalline waveguide is applied to measure refractive index profile across the waveguide layer. Results of the measurements allow one to find local director field within the liquid crystalline layer. Director field is applied to transform the Frank-Oseen equations into a form of an overdetermined algebraic system of equations with elastic constants as unknown variables. A solution of those equations has been found by the orthogonal decomposition method. Elastic constants for nematic mixture, W602, and main component of it, 6CHBT (4-trans-4-n-hexyl-cyclohexyl-isothiocyanatobenzene), have been obtained as well as anchoring energy values
2
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Investigations of Director Field Arrangement Induced in Tunable Liquid Crystalline Waveguide

100%
Walczak A.
Acta Physica Polonica A
|
1998
|
vol. 94
|
issue 5-6
813-823
EN
Measurements of the refractive index profile have been made to provide data for obtaining local optical axis arrangement in the waveguide cross-section. Liquid crystalline planar waveguide tuned with the electric field has been used. A new approach is proposed to accomplish refractive index profile measurements in a direct way. The modal line method is presented as a tool that allows one to do it and to improve the attenuated total reflection disadvantages as well. The obtained results maintain applicability of the modal line method for a direct refractive index profile measurement. To verify the method, nematic 6CHBT (4-trans-4-n-hexyl-cyclohexyl- isothiocyanatobenzene) described earlier in the literature has been examined. A nematic mixture W602 contained 6CHBT as a main component has been examined too.
3
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Molecular Reorientations οf N-n-Hexyltetrachlorophthalimide Studied by ^1H NMR

51%
Hołderna-Natkaniec K., Jurga K., Woźniak-Braszak A., Walczak A.
Acta Physica Polonica A
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2010
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vol. 117
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issue 4
537-548
EN
The spin-lattice relaxation times T_{1} and the second moment of ^{1}H NMR line have been employed to study the internal dynamics of protons of N-n-hexyl-tetra-chloro-phthali-mides in the temperature range 80-350 K. The model of internal reorientations has been proposed.
4
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Structural and Magnetic Properties of Co Thin Films on Au(111) Substrates

51%
Walczak A., Ślusarski T., Lehmann-Szweykowska A., Kamieniarz G.
Acta Physica Polonica A
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2012
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vol. 121
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issue 3
653-659
EN
The structural and magnetic properties of thin Co films grown on Au(111) substrates are investigated using ab initio local-spin-density calculations in the generalized gradient approximation. It is shown that a large lattice intermismatch between Co and Au(111) leads to a strong contraction of the interlayer distances within the Co layer, which adopts either the hexagonal close-packed (α-phase) or the face-centered cubic (β-phase) structure of bulk Co. Magnetic moments in the Co layer are increased beyond their value in bulk Co, the enhancement being strongest at the free surface and at the Co/Au interface, and more modest in the central part of the adlayer. Moderating influence of capping Ag layers on the structure and the magnetic properties of the films has also been considered. It is shown that Ag capping reduces the magnetic moments in comparison to uncovered Co/Au systems.
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