Magdalena Urbańska

Military University of Technology in Warsaw

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Aleksandra Deptuch

Institute of Nuclear Physics, Polish Academy of Sciences

R. Dąbrowski

Military University of Technology in Warsaw

P. Perkowski

Military University of Technology in Warsaw

Wiktor Piecek

Military University of Technology in Warsaw

Marzena Tykarska

Military University of Technology in Warsaw

Monika Marzec

Jagiellonian University

Anna Drzewicz

Institute of Nuclear Physics, Polish Academy of Sciences

Ewa Juszyńska‐Gałązka

Institute of Nuclear Physics, Polish Academy of Sciences

Zbigniew Raszewski

Military University of Technology in Warsaw

Przemysław Morawiak

Military University of Technology in Warsaw

Cooperative Institutions

Military University of Technology in Warsaw

Jagiellonian University

Institute of Physics

Czech Academy of Sciences, Institute of Physics

Instytut Chemii i Techniki Jądrowej

Warsaw University of Technology

University of Allahabad

University of Warsaw

Universidad Politécnica de Madrid

Polish Academy of Sciences

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NMR spectra of chiral smectic liquid crystals differing in helical parameters

Liquid Crystals (2018)

Marzena Tykarska Anna Drzewicz Mateusz Szala Magdalena Urbańska

Chiral liquid crystals with three-ring rigid core were examined. The method based on the selectively reflected light was used to determine the helical pitch. The helical twist sense was worked out using the polarimetry method. 1H and 13C NMR measurements were performed. The influence of three molecular structure parameters: the type of chiral centre, the length of non-chiral chain and substitution of benzene ring by fluorine atoms, on helical pitch, handedness of helical structure and values of chemical shift in proton and carbon spectra was determined. The change of the length of non-chiral terminal chain has the most significant influence on the temperature dependence of helical pitch. All tested parameters have the biggest influence on the values of chemical shift of atoms in the chiral centre.

Chirality

10.1080/02678292.2018.1441455

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Citations (6)

Crystallization kinetics in the chiral compound showing the vitrification of the smectic C_A* phase for moderate cooling rates

Phase Transitions (2023)

Aleksandra Deptuch Ewa Juszyńska‐Gałązka Małgorzata Jasiurkowska-Delaporte Anna Drzewicz Marcin Piwowarczyk

The crystallization of the 3F5FPhF6 compound from the liquid crystalline antiferroelectric smectic CA* phase is investigated in various conditions using differential scanning calorimetry and polarizing optical microscopy. The kinetics of isothermal melt and cold crystallization is studied on the basis of the Avrami model. The kinetics of non-isothermal cold crystallization is analysed using the Ozawa model and the activation energy is determined by the Augis-Bennett, Friedman's differential isoconversional and Matusita methods. The border temperature between the diffusion-controlled crystallization and thermodynamically-controlled crystallization is estimated. The high fragility index of 105 is determined from the α-process in the smectic CA* phase by the broadband dielectric spectroscopy. The metastable, conformationally disordered crystal phase, forming only via cold crystallization, is reported.

Isothermal process

Metastability

Polarized light microscopy

10.1080/01411594.2023.2168541

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Citations (4)

Fluorinated esters with a very broad temperature range of the antiferroelectric phase

Liquid Crystals (2023)

Magdalena Urbańska Olga Strzeżysz P. Perkowski

ABSTRACTAntiferroelectricity is a desirable property of liquid crystalline materials. Therefore, we synthesised and studied two new chiral rod-like mesogens with a molecular core based on two biphenyls connected via ester linkage, with the phenyl substituted by a fluorine atom. The studied mesogens are characterised by nuclear magnetic resonance spectroscopy and mass spectrometry analysis. They have methyl heptyl in the chiral chain and exhibit an antiferroelectric phase in a very broad temperature range. We investigated their mesomorphic properties and confirmed the phase identification by differential scanning calorimetry and broad-frequency dielectric spectroscopy measurements. Additionally, we compared the studied mesogens with previously synthesised analogous materials. Two mixtures were formulated using a base mixture and new mesogens. The helical pitch of the synthesised mesogens and formulated mixtures was estimated using the selective reflection method.KEYWORDS: SynthesisAFLCshelical pitcheutectic mixturesdielectric modes Disclosure statementNo potential conflict of interest was reported by the author(s).Supplementary dataSupplemental data for this article can be accessed online at https://doi.org/10.1080/02678292.2023.2252381.Additional informationFundingThis work was supported by the University Research Grant [UGB 22-801].

Antiferroelectricity

Atmospheric temperature range

Fluorine

10.1080/02678292.2023.2252381

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Citations (1)

Comparative X-ray Diffraction Study of Two Liquid Crystalline Compounds with Chiral Centers Based on (S)-(+)-2-Octanol and (S)-(+)-3-Octanol

Acta Physica Polonica A (2024)

Aleksandra Deptuch A. Lelito Bartosz Sęk Magdalena Urbańska

Octanol

10.12693/aphyspola.146.79

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Citations (1)

Investigation of glass transition and polymorphism of smectogenic, partially fluorinated chiral compound by X-ray diffraction and infra-red spectroscopy

Journal of Molecular Liquids (2024)

Aleksandra Deptuch Natalia Górska S. Baran Magdalena Urbańska

The X-ray diffraction and infra-red spectroscopy measurements are performed as a function of temperature upon heating of the glassy smectic CA* phase of liquid crystalline (S)-4′-(1-methylheptylcarbonyl)biphenyl-4-yl 4-[7-(2,2,3,3,4,4,4-heptafluorobutoxy)heptyl-1-oxy]-3-fluorobenzoate (3F7FPhH6) for the search of relationship between the structural changes and intra-molecular vibrations. The smectic layer spacing and correlation length, determined from the X-ray diffraction patterns, show different temperature dependences in the glassy state and above the glass transition temperature. The vibrational spectra do not show distinct changes upon the glass transition. Density-functional theory calculations for an isolated molecule in two conformations are applied for assignment of the IR absorption bands. The positive correlation between the average intermolecular distances and positions of two absorption bands, originating from the C = O stretching, is noticed and interpreted as a decreasing amount of the weak C-H…O = C hydrogen bonds upon heating in the smectic CA*, smectic A*, and isotropic liquid phases. The results are compared with the previously reported X-ray diffraction and infra-red data for the isostructural (S)-4′-(1-methylheptylcarbonyl)biphenyl-4-yl 4-[7-(2,2,3,3,4,4,4-heptafluorobutoxy)heptyl-1-oxy]-2-fluorobenzoate (3F7HPhF6).

10.1016/j.molliq.2024.125001

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Citations (2)

Diffuse phase transitions in thick ferroelectric Ba(TixSn1−x)O3 films of perovskite-type structure

Thin Solid Films (1980)

M. Łoposzko M. Pawełczyk Magdalena Urbańska Z. Surowiak

10.1016/0040-6090(80)90585-4

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Citations (5)

Correction: Deptuch et al. Molecular Dynamics and Kinetics of Isothermal Cold Crystallization in the Chiral Smectogenic 3F7FPhH6 Glassformer. Crystals 2021, 11, 1487

Crystals (2022)

Aleksandra Deptuch Małgorzata Jasiurkowska-Delaporte Ewa Juszyńska‐Gałązka Anna Drzewicz Wojciech Zając

The compound investigated in the publication [...]

Isothermal process

10.3390/cryst12111588

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A long-pitch orthoconic antiferroelectric mixture modified by isomeric and racemic homostructural dopants

Liquid Crystals (2018)

Przemysław Morawiak Magdalena Urbańska Wiktor Piecek

Orthoconic Antiferroelectric Liquid Crystals (OAFLC) are recognised as a promising medium for display and photonic applications due to their unique electrooptical properties. The application of OAFLC is still hampered by a number of parasitic effects deteriorating the electrooptical performance of contemporary available materials. An attempt elaborating of a working OAFLC mixture with the helical pitch longer than the typical cell gap is reported. Using this mixture, near-perfect optical uniformity and excellent dark state at the zero electric field applied were obtained. Basic OAFLC mixture was doped with two homostructural analogues to study the influence of the molecular polarity and chirality on the electrooptical performance and chosen physical parameters. The physical and structural properties of admixtures and their electrooptical performance are presented and discussed.

Antiferroelectricity

10.1080/02678292.2018.1446555

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Citations (23)

Mesomorphic phase transitions of 3F7HPhF studied by complementary methods

Phase Transitions (2017)

Aleksandra Deptuch T. Jaworska–Gołąb Monika Marzec Damian Pociecha Jakub Fitas

Physical properties and the phase sequence of (S)-4′-(1-methylheptyloxycarbonyl)biphenyl-4-yl 4-[7-(2,2,3,3,4,4,4-heptafluorobutoxy) heptyl-1-oxy]-2-fluorobenzoate exhibiting the liquid crystalline paraelectric smectic A*, ferroelectric smectic C* and antiferroelectric smectic CA* phases were studied by complementary methods in the temperature range from −125 to 120 °C. Differential scanning calorimetry measurements together with polarizing optical microscopy provided the phase sequence, including the glass transition and a cold crystallization. X-ray diffraction was used to obtain the unit-cell parameters of the crystal phase, as well as the layer thickness and correlation length in the liquid crystalline smectic phases. The tilt angle was found to reach 45°, as determined from the measurements of the layer thickness and molecular modeling. Relaxation processes in the smectic phases and the fragility parameter were studied using frequency-domain dielectric spectroscopy.

Antiferroelectricity

Polarized light microscopy

10.1080/01411594.2017.1393814

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Citations (22)

New antiferroelectric liquid crystal for use in LCD

Phase Transitions (2015)

Anna Dłubacz Monika Marzec D. Dardas Magdalena Urbańska

In this work, the physical properties of newly synthesized liquid crystalline compound exhibiting two liquid crystalline phases (ferroelectric and antiferroelectric) were studied. Based on the results of differential scanning calorimetry, polarizing microscopy, and photoelastic modulator methods, the temperature dependences of spontaneous polarization, tilt angle, switching time, and birefringence in the ferroelectric, as well as antiferroelectric phases were determined. Furthermore, the influence of the external electric field on the liquid crystalline textures was studied and the phase sequences at heating and cooling were revealed. The temperature dependence of spontaneous polarization was analysed by means of Landau mean-field theory, and the critical parameter β obtained for ferroelectric liquid crystalline and isotropic liquid transition was 0.21 which is close to 0.25, the value characteristic for tri-critical point.

Antiferroelectricity

Polarized light microscopy

Landau theory

10.1080/01411594.2015.1116531

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Citations (14)