Bimodal form distribution from modelling biaxial lyotropic liquid crystal solutions through a polydisperse Maier–Saupe model

Henriques, E. F.; Henriques, Vera B.; Krebs, P. R.

doi:10.1080/02678292.2016.1229053

Cited by 3 publications

(3 citation statements)

References 62 publications

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“…Biaxiality could be the result of perpendicular alignment of uniaxial particles of cylinder-like and disc-like geometry in a mixture. A model for a general distribution of micellar anisometries could fit the original experimental data of Yu and Saupe’s well-known 1980 paper [ 34 ], yielding a bimodal distribution, with the presence of two quadrupoles referred to as objects of opposite symmetry [ 59 ], giving support to the rationalization of the biaxial phase for lyotropic systems in terms of a polydisperse mixture of rod-like and disc-like micelles.…”

Section: Self-assembly and Lyotropic Liquid Crystalsmentioning

confidence: 94%

Supramolecular Aggregates: Hardness Plus Softness

Amáral

2021

Molecules

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The properties of supramolecular aggregates cross several disciplines, embracing the sciences of nature and joining theory, experiment, and application. There are few articles centering on the problems of interdisciplinarity, and this paper gives an alternative approach, starting with scientific divulgation, bringing concepts from their origin, to facilitate the access of young scientists to the scientific content. Didactic examples are taken from the experience of the author in changing directions of research due to several circumstances of life (including maternity), starting from the view of a rigorous student of physics and evolving to several subjects in chemistry. The scientific part starts with concepts related to nuclear interactions, using the technique of neutron scattering in reactors, and evolves to research in molecular physics. Finally, it arrives at the academic context, with research in condensed matter physics, with X-ray and other techniques, starting with detergents forming nematic lyotropic liquid crystals and the phase transition sequence of isotropic to nematics to hexagonal. The scientific subjects evolved to biological and bio-inspired liquid crystals, including DNA and also specific lipids and phospholipids in biomimetic membranes. Special attention is given to the question of distribution of matter in these complex systems and the non-trivial connections between biochemistry, structures, auto-aggregation, and biology.

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Section: Self-assembly and Lyotropic Liquid Crystalsmentioning

confidence: 94%

Supramolecular Aggregates: Hardness Plus Softness

Amáral

2021

Molecules

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“…Studies regarding switching in the N b and SmA b LC phases are mostly limited to those of bent-core molecules, − disc-like molecules, − and mixtures of these molecules with rodlike molecules, − which are known to be effective. However, these core shape-assisted approaches have the problem of low electroresponsiveness due to the large excluded volume during molecular rotation.…”

Section: Introductionmentioning

confidence: 99%

Does Introduction of a Bent Tail Stabilize Biaxiality and Lateral Switching Behavior of Smectic A Liquid Crystal Phases of Rodlike Molecules?

et al. 2019

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By introducing an oleyl group at the end of the straight rodlike molecule, the effect of the tail shape on the liquid crystallinity, biaxiality, and lateral switching behavior of the smectic A phase was investigated. Three types of molecules possessing a fluorinated phenyl (pentafluorophenyl, 2,3,4-trifluorophenyl, or 2,3-difluorophenyl) group and a cis-octadec-9-enyl group were synthesized, and their liquid crystallinities were compared with the corresponding molecules with a straight alkyl (trans-octadec-9-enyl or n-octadecanyl) group. In switching experiments, the molecules with a bent terminal chain showed higher spontaneous polarization (P s) values than those with a straight terminal chain. Further, the directional changes of the long molecular axes were suppressed for the molecules possessing a bent terminal chain. These results show that the introduction of a bent terminal chain is highly effective for stabilizing ferroelectric switching behaviors.

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“…O comportamento termodinâmico do sistema micelar descrito pelo modelo IBM está de acordo com as previsões teóricas das transições de fase, que são de segunda ordem, por argumentos de simetria [22,23]. Modelos mais genéricos de Mecânica Estatística com micelas discóticas e cilíndricas, em que não se limita a teoria de Landau por simetria [24], conseguem reproduzir satisfatoriamente alguns diagramas de fase (ainda que não se tenha observado coexistência de fases nemáticas, não se descarta em definitivo a coexistência de tipos micelares distintos na fase biaxial) [25,26,27].…”

Section: Capítulo 1 Introduçãounclassified

Estudos estruturais de cristais líquidos liotrópicos por métodos de espalhamento

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Bimodal form distribution from modelling biaxial lyotropic liquid crystal solutions through a polydisperse Maier–Saupe model

Cited by 3 publications

References 62 publications

Supramolecular Aggregates: Hardness Plus Softness

Supramolecular Aggregates: Hardness Plus Softness

Does Introduction of a Bent Tail Stabilize Biaxiality and Lateral Switching Behavior of Smectic A Liquid Crystal Phases of Rodlike Molecules?

Estudos estruturais de cristais líquidos liotrópicos por métodos de espalhamento

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