Igor Chistyakov and Development of X-Ray Studies of Liquid Crystals

Ostrovskiǐ, B. I.

doi:10.18083/lcappl.2019.3.5

Cited by 2 publications

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“…Usually, smectic A polymorphism is observed in highly polar compounds, most often in compounds possessing end groups -NO 2 , -CN, etc. [51][52][53] In non-polar compounds, partially bilayer smectic A (SmA d ) phase was first reported by Ratna et al, in n-dodecyl-4-(4-ethoxybenzylidene amino)-a-methylcinnamate. 54 In the literature, ethylene glycol chains are found to show strong dipole-dipole interactions.…”

Section: Mesophase Characterizationmentioning

confidence: 99%

Synthesis and mesomorphic characterization of novel amphotropic steroidal esters

et al. 2023

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Section: Mesophase Characterizationmentioning

confidence: 99%

Synthesis and mesomorphic characterization of novel amphotropic steroidal esters

et al. 2023

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“…The role of polar and steric molecular assymetry in smectic polymorphism has been comprehensively reviewed [23,1631. The role of polar and steric molecular assymetry in smectic polymorphism has been comprehensively reviewed [23,1631.…”

Section: Modulated and Incommensurate Fluid Smectic Phasesmentioning

confidence: 99%

Structural Studies of Liquid Crystals by X‐Ray Diffraction

Seddon¹

1998

Handbook of Liquid Crystals Set

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This section is concerned with how structural information about liquid crystal phases may be obtained from X-ray diffraction studies. In addition to presenting a brief overview of some of the more quantitative aspects, we will also attempt to give a simple pictorial view of how diffraction patterns may be analyzed qualitatively in terms of the mesophase structures. For the background X-ray diffraction theory relevant to partially-ordered systems, a number of classical texts should be consulted [l-31.Here we will focus on the bulk static structures of the phases formed by low molar mass calamitic (rod-like) mesogens. The principles involved in structural studies of columnar phases, and of polymeric and lyotropic systems, are very similar. The study of liquid crystal surfaces requires reflectivity and/or glancing angle diffraction techniques [4 -61.A number of reviews describe X-ray studies of liquid crystals up to about 1980 [7-101. A monograph by P. S. Pershan [ l l ] reviews X-ray work up to 1987, and reprints many of the most significant papers in the field. A number of more recent texts cover various structural aspects of liquid crystal phases [ 12-141. Other reviews describe the structural classification of liquid crystals [ 151, the nature of the ordering within smectic phases [ 16-181, the structures of ferroelectric and chiral smectic phases [ 191, the structures of frustrated smectics [20 -241, the structures of columnar discotic liquid crystals [25], and X-ray studies of side group liquid crystalline polymers [26].Orientational order in liquid crystals is most effectively studied using 'molecular probe' techniques such as NMR spectroscopy. However, the study of translational order, that is structure, requires diffraction techniques, usually involving X-rays or neutrons. A disadvantage of diffraction is that it does not distinguish between static and dynamic disorder. However, this can be achieved using quasielastic neutron scattering.Diffraction is a phenomenon which comes about when radiation is elastically scattered from atoms in a sample (primarily from electrons for X-ray diffraction). The various scattered wavelets from the different atomic sites combine, undergoing constructive or destructive interference, depending on the relative phases of the differ-

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Igor Chistyakov and Development of X-Ray Studies of Liquid Crystals

Cited by 2 publications

References 30 publications

Synthesis and mesomorphic characterization of novel amphotropic steroidal esters

Synthesis and mesomorphic characterization of novel amphotropic steroidal esters

Structural Studies of Liquid Crystals by X‐Ray Diffraction

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