The Dominance of Pretransitional Effects in Liquid Crystal-Based Nanocolloids: Nematogenic 4-methoxybenzylidene-4′–butylaniline with Transverse Permanent Dipole Moment and BaTiO 3 Nanoparticles.
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| Title: | The Dominance of Pretransitional Effects in Liquid Crystal-Based Nanocolloids: Nematogenic 4-methoxybenzylidene-4′–butylaniline with Transverse Permanent Dipole Moment and BaTiO 3 Nanoparticles. |
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| Authors: | Drozd-Rzoska, Aleksandra1 (AUTHOR) arzoska@unipress.waw.pl, Łoś, Joanna1 (AUTHOR), Rzoska, Sylwester J.1 (AUTHOR) sylwester.rzoska@gmail.com |
| Source: | Nanomaterials (2079-4991). Apr2024, Vol. 14 Issue 8, p655. 24p. |
| Subjects: | Dipole moments, Dielectric properties, Nanoparticles, Permittivity, Isotropic properties |
| Abstract: | The report presents static, low-frequency, and dynamic dielectric properties in the isotropic liquid, nematic, and solid phases of MBBA and related nanocolloids with paraelectric BaTiO3 nanoparticles (spherical, d = 50 nm). MBBA (4-methoxybenzylidene-4′–butylaniline) is a liquid crystalline compound with a permanent dipole moment transverse to the long molecular axis. The distortions-sensitive analysis of the dielectric constant revealed its hidden pretransitional anomaly, strongly influenced by the addition of nanoparticles. The evolution of the dielectric constant in the nematic phase shows the split into two regions, with the crossover coinciding with the standard melting temperature. The 'universal' exponential-type behavior of the low-frequency contribution to the real part of the dielectric permittivity is found. The critical-like pretransitional behavior in the solid phase is also evidenced. This is explained by linking the Lipovsky model to the Mossotti catastrophe concept under quasi-negative pressure conditions. The explicit preference for the 'critical-like' evolution of the apparent activation enthalpy is worth stressing for dynamics. Finally, the long-range, 'critical-like' behavior of the dissipation factor (D = tgδ), covering the isotropic liquid and nematic phases, is shown. [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.) | |
| Database: | Engineering Source |
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| Header | DbId: egs DbLabel: Engineering Source An: 176907503 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: The Dominance of Pretransitional Effects in Liquid Crystal-Based Nanocolloids: Nematogenic 4-methoxybenzylidene-4′–butylaniline with Transverse Permanent Dipole Moment and BaTiO 3 Nanoparticles. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Drozd-Rzoska%2C+Aleksandra%22">Drozd-Rzoska, Aleksandra</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> arzoska@unipress.waw.pl</i><br /><searchLink fieldCode="AR" term="%22Łoś%2C+Joanna%22">Łoś, Joanna</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Rzoska%2C+Sylwester+J%2E%22">Rzoska, Sylwester J.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> sylwester.rzoska@gmail.com</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Nanomaterials+%282079-4991%29%22">Nanomaterials (2079-4991)</searchLink>. Apr2024, Vol. 14 Issue 8, p655. 24p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Dipole+moments%22">Dipole moments</searchLink><br /><searchLink fieldCode="DE" term="%22Dielectric+properties%22">Dielectric properties</searchLink><br /><searchLink fieldCode="DE" term="%22Nanoparticles%22">Nanoparticles</searchLink><br /><searchLink fieldCode="DE" term="%22Permittivity%22">Permittivity</searchLink><br /><searchLink fieldCode="DE" term="%22Isotropic+properties%22">Isotropic properties</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The report presents static, low-frequency, and dynamic dielectric properties in the isotropic liquid, nematic, and solid phases of MBBA and related nanocolloids with paraelectric BaTiO3 nanoparticles (spherical, d = 50 nm). MBBA (4-methoxybenzylidene-4′–butylaniline) is a liquid crystalline compound with a permanent dipole moment transverse to the long molecular axis. The distortions-sensitive analysis of the dielectric constant revealed its hidden pretransitional anomaly, strongly influenced by the addition of nanoparticles. The evolution of the dielectric constant in the nematic phase shows the split into two regions, with the crossover coinciding with the standard melting temperature. The 'universal' exponential-type behavior of the low-frequency contribution to the real part of the dielectric permittivity is found. The critical-like pretransitional behavior in the solid phase is also evidenced. This is explained by linking the Lipovsky model to the Mossotti catastrophe concept under quasi-negative pressure conditions. The explicit preference for the 'critical-like' evolution of the apparent activation enthalpy is worth stressing for dynamics. Finally, the long-range, 'critical-like' behavior of the dissipation factor (D = tgδ), covering the isotropic liquid and nematic phases, is shown. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab 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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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.3390/nano14080655 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 24 StartPage: 655 Subjects: – SubjectFull: Dipole moments Type: general – SubjectFull: Dielectric properties Type: general – SubjectFull: Nanoparticles Type: general – SubjectFull: Permittivity Type: general – SubjectFull: Isotropic properties Type: general Titles: – TitleFull: The Dominance of Pretransitional Effects in Liquid Crystal-Based Nanocolloids: Nematogenic 4-methoxybenzylidene-4′–butylaniline with Transverse Permanent Dipole Moment and BaTiO 3 Nanoparticles. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Drozd-Rzoska, Aleksandra – PersonEntity: Name: NameFull: Łoś, Joanna – PersonEntity: Name: NameFull: Rzoska, Sylwester J. IsPartOfRelationships: – BibEntity: Dates: – D: 15 M: 04 Text: Apr2024 Type: published Y: 2024 Identifiers: – Type: issn-print Value: 20794991 Numbering: – Type: volume Value: 14 – Type: issue Value: 8 Titles: – TitleFull: Nanomaterials (2079-4991) Type: main |
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