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Macroscopic Biaxial Order in Multilayer Films of Bent-Core Liquid Crystals Deposited by Combined Langmuir–Blodgett/Langmuir–Schaefer Technique.

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Title: Macroscopic Biaxial Order in Multilayer Films of Bent-Core Liquid Crystals Deposited by Combined Langmuir–Blodgett/Langmuir–Schaefer Technique.
Authors: Vita, Francesco1 (AUTHOR) f.c.adamo@staff.univpm.it, Adamo, Fabrizio Corrado1 (AUTHOR) m.pisani@univpm.it, Campana, Mario2 (AUTHOR) mario.campana@stfc.ac.uk, Bordokas, Blake3 (AUTHOR) blake@bordokas.com, Ciuchi, Federica4 (AUTHOR) federica.ciuchi@cnr.it, De Santo, Maria Penelope4,5 (AUTHOR) maria.desanto@fis.unical.it, Hermida-Merino, Daniel6,7 (AUTHOR) daniel.hermida_merino@esrf.fr, Lisovsky, Angela3 (AUTHOR) angelalisovsky@outlook.com, Pisani, Michela1 (AUTHOR), Pontoni, Diego8 (AUTHOR) diego.pontoni@esrf.fr, Scharrer, Eric3 (AUTHOR) escharrer@pugetsound.edu, Francescangeli, Oriano1 (AUTHOR) f.vita@univpm.it
Source: Nanomaterials (2079-4991). Feb2024, Vol. 14 Issue 4, p357. 13p.
Subjects: Liquid crystal films, Neutron reflectivity, Liquid crystals, Atomic force microscopy, Molecular structure, Mesophases, X-ray scattering, Gamma ray bursts
Abstract: Bent-core liquid crystals, a class of mesogenic compounds with non-linear molecular structures, are well known for their unconventional mesophases, characterized by complex molecular (and supramolecular) ordering and often featuring biaxial and polar properties. In the nematic phase, their unique behavior is manifested in the formation of nano-sized biaxial clusters of layered molecules (cybotactic groups). While this prompted their consideration in the quest for nematic biaxiality, experimental evidence indicates that the cybotactic order is only short-ranged and that the nematic phase is macroscopically uniaxial. By combining atomic force microscopy, neutron reflectivity and wide-angle grazing-incidence X-ray scattering, here, we demonstrate that multilayer films of a bent-core nematic, deposited on silicon by a combined Langmuir–Blodgett and Langmuir–Schaefer approach, exhibit macroscopic in-plane ordering, with the long molecular axis tilted with respect to the sample surface and the short molecular axis (i.e., the apex bisector) aligned along the film compression direction. We thus propose the use of Langmuir films as an effective way to study and control the complex anchoring properties of bent-core liquid crystals. [ABSTRACT FROM AUTHOR]
Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Macroscopic Biaxial Order in Multilayer Films of Bent-Core Liquid Crystals Deposited by Combined Langmuir–Blodgett/Langmuir–Schaefer Technique.
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  Data: <searchLink fieldCode="AR" term="%22Vita%2C+Francesco%22">Vita, Francesco</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> f.c.adamo@staff.univpm.it</i><br /><searchLink fieldCode="AR" term="%22Adamo%2C+Fabrizio+Corrado%22">Adamo, Fabrizio Corrado</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> m.pisani@univpm.it</i><br /><searchLink fieldCode="AR" term="%22Campana%2C+Mario%22">Campana, Mario</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> mario.campana@stfc.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Bordokas%2C+Blake%22">Bordokas, Blake</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> blake@bordokas.com</i><br /><searchLink fieldCode="AR" term="%22Ciuchi%2C+Federica%22">Ciuchi, Federica</searchLink><relatesTo>4</relatesTo> (AUTHOR)<i> federica.ciuchi@cnr.it</i><br /><searchLink fieldCode="AR" term="%22De+Santo%2C+Maria+Penelope%22">De Santo, Maria Penelope</searchLink><relatesTo>4,5</relatesTo> (AUTHOR)<i> maria.desanto@fis.unical.it</i><br /><searchLink fieldCode="AR" term="%22Hermida-Merino%2C+Daniel%22">Hermida-Merino, Daniel</searchLink><relatesTo>6,7</relatesTo> (AUTHOR)<i> daniel.hermida_merino@esrf.fr</i><br /><searchLink fieldCode="AR" term="%22Lisovsky%2C+Angela%22">Lisovsky, Angela</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> angelalisovsky@outlook.com</i><br /><searchLink fieldCode="AR" term="%22Pisani%2C+Michela%22">Pisani, Michela</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Pontoni%2C+Diego%22">Pontoni, Diego</searchLink><relatesTo>8</relatesTo> (AUTHOR)<i> diego.pontoni@esrf.fr</i><br /><searchLink fieldCode="AR" term="%22Scharrer%2C+Eric%22">Scharrer, Eric</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> escharrer@pugetsound.edu</i><br /><searchLink fieldCode="AR" term="%22Francescangeli%2C+Oriano%22">Francescangeli, Oriano</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> f.vita@univpm.it</i>
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  Data: <searchLink fieldCode="DE" term="%22Liquid+crystal+films%22">Liquid crystal films</searchLink><br /><searchLink fieldCode="DE" term="%22Neutron+reflectivity%22">Neutron reflectivity</searchLink><br /><searchLink fieldCode="DE" term="%22Liquid+crystals%22">Liquid crystals</searchLink><br /><searchLink fieldCode="DE" term="%22Atomic+force+microscopy%22">Atomic force microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Molecular+structure%22">Molecular structure</searchLink><br /><searchLink fieldCode="DE" term="%22Mesophases%22">Mesophases</searchLink><br /><searchLink fieldCode="DE" term="%22X-ray+scattering%22">X-ray scattering</searchLink><br /><searchLink fieldCode="DE" term="%22Gamma+ray+bursts%22">Gamma ray bursts</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Bent-core liquid crystals, a class of mesogenic compounds with non-linear molecular structures, are well known for their unconventional mesophases, characterized by complex molecular (and supramolecular) ordering and often featuring biaxial and polar properties. In the nematic phase, their unique behavior is manifested in the formation of nano-sized biaxial clusters of layered molecules (cybotactic groups). While this prompted their consideration in the quest for nematic biaxiality, experimental evidence indicates that the cybotactic order is only short-ranged and that the nematic phase is macroscopically uniaxial. By combining atomic force microscopy, neutron reflectivity and wide-angle grazing-incidence X-ray scattering, here, we demonstrate that multilayer films of a bent-core nematic, deposited on silicon by a combined Langmuir–Blodgett and Langmuir–Schaefer approach, exhibit macroscopic in-plane ordering, with the long molecular axis tilted with respect to the sample surface and the short molecular axis (i.e., the apex bisector) aligned along the film compression direction. We thus propose the use of Langmuir films as an effective way to study and control the complex anchoring properties of bent-core liquid crystals. [ABSTRACT FROM AUTHOR]
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  Label:
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  Data: <i>Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.3390/nano14040357
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        Text: English
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      – SubjectFull: Liquid crystal films
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      – SubjectFull: Neutron reflectivity
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