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  1. Article ; Online: New examples of ferroelectric nematic materials showing evidence for the antiferroelectric smectic-Z phase.

    Nacke, Pierre / Manabe, Atsutaka / Klasen-Memmer, Melanie / Chen, Xi / Martinez, Vikina / Freychet, Guillaume / Zhernenkov, Mikhail / Maclennan, Joseph E / Clark, Noel A / Bremer, Matthias / Giesselmann, Frank

    Scientific reports

    2024  Volume 14, Issue 1, Page(s) 4473

    Abstract: We present a new ferroelectric nematic material, 4-((4'-((trans)-5-ethyloxan-2-yl)-2',3,5,6'-tetrafluoro-[1,1'-biphenyl]-4-yl)difluoromethoxy)-2,6-difluorobenzonitrile (AUUQU-2-N) and its higher homologues, the molecular structures of which include ... ...

    Abstract We present a new ferroelectric nematic material, 4-((4'-((trans)-5-ethyloxan-2-yl)-2',3,5,6'-tetrafluoro-[1,1'-biphenyl]-4-yl)difluoromethoxy)-2,6-difluorobenzonitrile (AUUQU-2-N) and its higher homologues, the molecular structures of which include fluorinated building blocks, an oxane ring, and a terminal cyano group, all contributing to a large molecular dipole moment of about 12.5 D. We observed that AUUQU-2-N has three distinct liquid crystal phases, two of which were found to be polar phases with a spontaneous electric polarization P
    Language English
    Publishing date 2024-02-23
    Publishing country England
    Document type Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-024-54832-0
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: The smectic Z

    Chen, Xi / Martinez, Vikina / Korblova, Eva / Freychet, Guillaume / Zhernenkov, Mikhail / Glaser, Matthew A / Wang, Cheng / Zhu, Chenhui / Radzihovsky, Leo / Maclennan, Joseph E / Walba, David M / Clark, Noel A

    Proceedings of the National Academy of Sciences of the United States of America

    2023  Volume 120, Issue 8, Page(s) e2217150120

    Abstract: We have structurally characterized the liquid crystal (LC) phase that can appear as an intermediate state when a dielectric nematic, having polar disorder of its molecular dipoles, transitions to the almost perfectly polar-ordered ferroelectric nematic. ... ...

    Abstract We have structurally characterized the liquid crystal (LC) phase that can appear as an intermediate state when a dielectric nematic, having polar disorder of its molecular dipoles, transitions to the almost perfectly polar-ordered ferroelectric nematic. This intermediate phase, which fills a 100-y-old void in the taxonomy of smectic LCs and which we term the "smectic Z
    Language English
    Publishing date 2023-02-15
    Publishing country United States
    Document type Journal Article
    ZDB-ID 209104-5
    ISSN 1091-6490 ; 0027-8424
    ISSN (online) 1091-6490
    ISSN 0027-8424
    DOI 10.1073/pnas.2217150120
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 1148: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
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  3. Book ; Online: Thermotropic reentrant isotropy and antiferroelectricity in the ferroelectric nematic material RM734

    Chen, Xi / Shuai, Min / Zhong, Bingchen / Martinez, Vikina / Korblova, Eva / Glaser, Matthew A. / Maclennan, Joseph E. / Walba, David M. / Clark, Noel A.

    2023  

    Abstract: We report a transition from the ferroelectric nematic liquid crystal ($N_F$) phase to a lower-temperature, antiferroelectric fluid phase having reentrant isotropic symmetry ($I_A$), in the liquid crystal compound RM734 doped with small concentrations of ... ...

    Abstract We report a transition from the ferroelectric nematic liquid crystal ($N_F$) phase to a lower-temperature, antiferroelectric fluid phase having reentrant isotropic symmetry ($I_A$), in the liquid crystal compound RM734 doped with small concentrations of the ionic liquids BMIM or EMIM. Even a trace amount of ionic liquid dopant facilitates the kinetic pathway for the transition from the $N_F$ to the $I_A$, enabling simple cooling to produce this isotropic fluid phase rather than resulting in crystallization. The $I_A$ was also obtained in the absence of specific ionic liquid doping by appropriate temperature cycling in three distinct, as-synthesized-and-purified batches of RM734, two commercial and one from our laboratory. An additional birefringent, lamellar-modulated, antiferroelectric phase with the director parallel to the layers, resembling the smectic $Z_A$, is found between the paraelectric and ferroelectric nematic phases in RM734/BMIM mixtures.

    Comment: 45 pages, including Supplementary Information
    Keywords Condensed Matter - Soft Condensed Matter
    Subject code 660
    Publishing date 2023-09-10
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Book ; Online: Thermotropic reentrant isotropy and antiferroelectricity in the ferroelectric nematic realm

    Zhong, Bingchen / Shuai, Min / Chen, Xi / Martinez, Vikina / Korblova, Eva / Glaser, Matthew A. / Maclennan, Joseph E. / Walba, David M. / Clark, Noel A.

    Comparing RM734 and DIO

    2023  

    Abstract: The current intense study of ferroelectric nematic liquid crystals was initiated by the observation of the same ferroelectric nematic phase in two independently discovered organic rod-shaped mesogenic compounds, RM734 and DIO. We recently reported that ... ...

    Abstract The current intense study of ferroelectric nematic liquid crystals was initiated by the observation of the same ferroelectric nematic phase in two independently discovered organic rod-shaped mesogenic compounds, RM734 and DIO. We recently reported that the compound RM734 also exhibits a monotropic, low-temperature, antiferroelectric phase having reentrant isotropic symmetry (the $I_A$ phase), the formation of which is facilitated to a remarkable degree by doping with small (below $1\%$) amounts of the ionic liquid ${\rm BMIM-PF}_6$. Here we report similar phenomenology in DIO, showing that this reentrant isotropic behavior is not only a property of RM734 but is rather a more general, material-independent feature of ferroelectric nematic mesogens. We find that the reentrant isotropic phases observed in RM734 and DIO are similar but not identical, adding two new phases to the ferroelectric nematic realm. The two $I_A$ phases exhibit similar, strongly peaked, diffuse x-ray scattering in the WAXS range $(1<q<2 \, \AA^{-1})$ indicative of a distinctive mode of short-ranged, side-by-side molecular packing. The scattering of the $I_A$ phases at small $q$ is quite different in the two materials, however, with RM734 exhibiting a strong, single, diffuse peak at $q \sim 0.08 \,\AA ^{-1}$ indicating mesoscale modulation with $\sim 80 \,\AA$ periodicity, and DIO a sharper diffuse peak at $q \sim 0.27 \,\AA ^{-1} \sim (2\pi/{\rm molecular length})$, with second and third harmonics, indicating that in the $I_A$ phase of DIO, short-ranged molecular positional correlation is smectic layer-like.<br />
    Comment: main text 22 pages and 7 figures; supplement 9 pages and 6 figures. arXiv admin note: substantial text overlap with arXiv:2309.04935
    Keywords Condensed Matter - Soft Condensed Matter
    Subject code 612
    Publishing date 2023-12-28
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article: Validation of thermophysical data for scientific and engineering applications

    Diky, Vladimir / Bazyleva, Ala / Paulechka, Eugene / Magee, Joseph W / Martinez, Vikina / Riccardi, Demian / Kroenlein, Kenneth

    The Journal of chemical thermodynamics

    2020  Volume 133, Page(s) 208–222

    Abstract: High quality thermophysical property data are essential to many scientific and engineering applications. These data are produced at a high rate and are affected by a range of experimental and reporting error sources that often exceed stated uncertainties. ...

    Abstract High quality thermophysical property data are essential to many scientific and engineering applications. These data are produced at a high rate and are affected by a range of experimental and reporting error sources that often exceed stated uncertainties. As a result, critical evaluation is required to establish the limits of reliability in a quantified way. The present work describes reporting recommendations and property data validation methods developed and applied at the Thermodynamics Research Center at NIST through the use of the ThermoData Engine (TDE; SRD 103a/b) software. Examples are provided with an emphasis on various consistency checks, which may include the use of equations of state (EOS).
    Language English
    Publishing date 2020-03-12
    Publishing country England
    Document type Journal Article
    ISSN 0021-9614
    ISSN 0021-9614
    DOI 10.1016/j.jct.2019.01.029
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Observation of a uniaxial ferroelectric smectic A phase.

    Chen, Xi / Martinez, Vikina / Nacke, Pierre / Korblova, Eva / Manabe, Atsutaka / Klasen-Memmer, Melanie / Freychet, Guillaume / Zhernenkov, Mikhail / Glaser, Matthew A / Radzihovsky, Leo / Maclennan, Joseph E / Walba, David M / Bremer, Matthias / Giesselmann, Frank / Clark, Noel A

    Proceedings of the National Academy of Sciences of the United States of America

    2022  Volume 119, Issue 47, Page(s) e2210062119

    Abstract: We report the observation of the smectic ... ...

    Abstract We report the observation of the smectic A
    Language English
    Publishing date 2022-11-14
    Publishing country United States
    Document type Journal Article
    ZDB-ID 209104-5
    ISSN 1091-6490 ; 0027-8424
    ISSN (online) 1091-6490
    ISSN 0027-8424
    DOI 10.1073/pnas.2210062119
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 1148: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)

    Order via subito

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