| Title: | Antiferroelectric order in nematic liquids : flexoelectricity versus electrostatics |
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| Authors: | ID Medle Rupnik, Peter, Institut "Jožef Stefan" (Author)
ID Hanžel, Ema, Institut "Jožef Stefan" (Author)
ID Lovšin, Matija, Institut "Jožef Stefan" (Author)
ID Osterman, Natan, Institut "Jožef Stefan" (Author)
ID Gibb, Calum Jordan (Author)
ID Mandle, Richard J. (Author)
ID Sebastián Ugarteche, Nerea, Institut "Jožef Stefan" (Author)
ID Mertelj, Alenka, Institut "Jožef Stefan" (Author) |
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| Files: |  URL - Source URL, visit https://advanced.onlinelibrary.wiley.com/doi/10.1002/advs.202414818
 PDF - Presentation file, download (32,84 MB)
MD5: 6CAE7A3CF68D0D7DE041D292A1989C5F
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| Language: | English |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: |  IJS - Jožef Stefan Institute
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| Abstract: | The recent discovery of ferroelectric nematic liquid crystalline phases marks a major breakthrough in soft matter research. An intermediate phase, often observed between the nonpolar and the ferroelectric nematic phase, shows a distinct antiferroelectric response to electric fields. However, its structure and formation mechanisms remain debated, with flexoelectric and electrostatics effects proposed as competing mechanisms. By controlling the magnitude of electrostatic forces through ion addition in two representative ferroelectric nematic materials, it is shown that the primary mechanism for the emergence of antiferroelectric order is the flexoelectric coupling between electric polarization and splay deformation of the nematic director. The addition of ions significantly expands the temperature range over which the antiferroelectric phase is observed, with this range increasing with increasing ion concentration. Polarizing optical microscopy studies and second harmonic generation (SHG) microscopy reveal the splayed structure modulated in 2D, while SHG interferometry confirms its antiferroelectric character. The model previously used to describe pretransitional behavior is extended by incorporating the electrostatic contribution of ions. The model shows qualitative agreement with the experiments, accurately reproducing the phase diagram and temperature-dependent evolution of the modulation period of the observed structure. |
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| Keywords: | ferroelectric nematic liquids, flexoelectricity, antiferroelectric order |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Submitted for review: | 12.11.2024 |
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| Publication date: | 09.01.2025 |
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| Publisher: | Wiley |
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| Year of publishing: | 2025 |
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| Number of pages: | str. 1-13 |
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| Numbering: | Vol 12, iss. 9 |
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| Source: | ZDA |
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| PID: | 20.500.12556/DiRROS-23627  |
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| UDC: | 537 |
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| ISSN on article: | 2198-3844 |
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| DOI: | 10.1002/advs.202414818 |
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| COBISS.SI-ID: | 222625027 |
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| Copyright: | © 2025 The Author(s). |
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| Note: | Nasl. z nasl. zaslona;
Soavtorji iz Slovenije: Ema Hanžel, Matija Lovšin, Natan Osterman, Nerea Sebastián, Alenka Mertelj;
Opis vira z dne 16. 1. 2025;
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| Publication date in DiRROS: | 15.09.2025 |
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| Views: | 275 |
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| Downloads: | 120 |
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