Monika Marzec

Jagiellonian University

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S. Wróbel

Institute of Physics

R. Dąbrowski

Military University of Technology in Warsaw

Aleksandra Deptuch

Institute of Nuclear Physics, Polish Academy of Sciences

W. Haase

Technical University of Darmstadt

Sebastian Lalik

Institute of Physics

J. Chruściel

University of Siedlce

T. Jaworska–Gołąb

Jagiellonian University

Agnieszka Iwan

Military Institute of Engineer Technology

A. Mikułko

Jagiellonian University

Magdalena Urbańska

Military University of Technology in Warsaw

Cooperative Institutions

Jagiellonian University

112

Institute of Physics

Czech Academy of Sciences, Institute of Physics

Polish Academy of Sciences

AGH University of Krakow

Faculty (United Kingdom)

Institute of Nuclear Physics, Polish Academy of Sciences

Centre National de la Recherche Scientifique

Technical University of Darmstadt

Cracow University of Technology

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Dielectric, Thermal and Mechanical Properties of l,d-Poly(Lactic Acid) Modified by 4′-Pentyl-4-Biphenylcarbonitrile and Single Walled Carbon Nanotube

Polymers (2019)

Patryk Fryń Krzysztof Artur Bogdanowicz P. Krysiak Monika Marzec Agnieszka Iwan

We report here the preparation and thermal, electrical and mechanical characterization of binary and ternary films based on l,d-poly(lactic acid) (l,d-PLA) and 4'-pentyl-4-biphenylcarbonitrile (5CB) and Single Walled Carbon Nanotubes (SWCN) with various weight ratio. The transitions for all investigated hybrid compositions detected by differential scanning calorimetry method were shifted to lower temperatures with increasing the concentration of 5CB in the mixture with polymer. Frequency domain dielectric spectroscopy method and thermal imaging together with polarized optical microscope were used to study electric and structural properties of created hybrid compositions. The best electrical conductivity was observed for hybrid composite l,d-PLA:5CB:SWCN with ratio 10:1:0.5 w/w/w - resistance of 41.0 Ω and thermal response up to 160 °C without causing any damages. Films in crystal form are much more inflexible than in amorphous and can be explain by the cold crystallization occurs at heating while the materials changed their physical state. The value of ε' increases with increasing the 5CB admixture. Moreover, the addition of 5CB to l,d-PLA resulted in increased flexibility of polymeric base films. The best material flexibility and short-term strength were obtained for l,d-PLA sample with 9% 5CB content.

10.3390/polym11111867

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Citations (11)

Dielectric and Electrooptic Studies of Chiral Thioester

Molecular Crystals and Liquid Crystals (2011)

Monika Marzec M.A. Bohdan M. D. Ossowska–Chruściel J. Chruściel S. Wróbel

The aim of this work is to study by complementary methods physical properties of calamitic chiral thioester showing ferroelectric behaviour. Phase transition temperatures, stability as well as rich polymorphism have been investigated by DSC measurements and texture observations. The type of the paraelectric–ferroelectric phase transition has been studied based on the spontaneous polarization measurements. The relaxation processes have been revealed in all liquid crystalline phases and sub-phases using the dielectric spectroscopy method. The interpretation of all of them is presented.

Thioester

10.1080/15421406.2011.568889

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Citations (3)

New antiferroelectric compound studied by complementary methods

Phase Transitions (2014)

Monika Marzec Patryk Fryń Marzena Tykarska

New antiferroelectric compound has been studied by electrooptic methods. The electrooptic parameters such as spontaneous polarization, tilt angle and switching time were measured. Using texture observation and differential scanning calorimetric methods, the phase sequences at cooling and heating have been obtained.

Antiferroelectricity

10.1080/01411594.2014.953513

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Citations (8)

PHASE BEHAVIOUR AND ELECTROOPTIC PROPERTIES OF A NEW FLUORINATED MHPOBC ANALOGUE

Molecular crystals and liquid crystals science technology. Section A, Molecular crystals and liquid crystals/Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals (2001)

Monika Marzec D. Ganzke W. Haase R. Dąbrowski K. Czupryński

Abstract A new MHPOBC analogue displaying ferroelectric and antiferroelectric properties has been studied by complementary methods. The dielectric measurements have been performed on a gold coated cell having thickness of 23 μm. In the antiferroelectric SmCA* phase two dielectric processes have been observed. Both these processes show Arrhenius type behaviour. Reversal current method has been applied to study temperature dependence of two polarization current peaks in the antiferroelectric phase. Temperature dependence of the spontaneous polarization in the ferroelectric and antiferroelectric phases has been studied and discussed in terms of the mean-field model.

Antiferroelectricity

10.1080/10587250108023999

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Citations (3)

Antiferroelectric liquid crystals studied by DSC, electro-optic, and dielectric methods

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2000)

Monika Marzec A. Fąfara S. Wróbel M. Godlewska R. Dąbrowski

Thermal properties of four liquid crystalline substances exhibiting antiferroelectric SmC_A* and ferroelectric SmC* phases were studied using differential scanning calorimetry, texture observation, electrooptic measurements and dielectric spectroscopy. The measurements were performed both on heating and cooling of the samples. All four substances studied in this work are characterized by a complex polymorphism. The temperatures of phase transitions and enthalpy changes associated with them were determined. The transition from the liquid crystalline to the crystalline state showed significant hysteresis for all four substances studied. Textures observations and electrooptic measurements were performed using ITO cells having thickness from 6 to 10 micrometers . The measurements of spontaneous polarization were performed by means of reversal current method. Spontaneous polarization was measured for a few frequencies of the triangular voltage applied. Temperature dependencies of spontaneous polarization have been studied as a function of the side chain structure.

Antiferroelectricity

Texture (cosmology)

10.1117/12.385664

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Citations (2)

Mean-Field Behavior of the Paraelectric-Ferroelectric Phase Transition of a Fluorinated Compound

Ferroelectrics (2002)

A. Fąfara D. Ganzke W. Haase Monika Marzec S. Wróbel

The partially fluorinated MHPOBC analogue (MHPO(F)PBC) shows an attractive phase sequence: SmA*, SmC f *, SmC* and SmC A *. The SmC f * phase was only observed by reversal current switching method. Measurements of spontaneous polarization P s (T) reveal the existence of the SmC f * sub-phase between the SmA* and SmC* phases. Linear dielectric spectroscopy studies corroborate almost model behavior of the soft mode relaxation frequency - obtained under bias field of 20V/20 w m -in the vicinity of the SmA*-SmC* phase transition. Keywords: Ferroelectric And Antiferroelectric Liquid CrystalsDielectric SpectroscopyAntiferroelectric ModesSpontaneous PolarizationPhase Transitions

Ferroics

10.1080/00150190214412

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Citations (1)

Structural and electrochemical studies of TiO₂ complexes with (4,4′-((1E,1′E)-(2,5-bis(octyloxy)-1,4-phenylene)bis(ethene-2,1-diyl))bis-(E)-N-(2,5-bis(octyloxy)benzylidene)) imine derivative bases towards organic devices

Dalton Transactions (2018)

Anna Różycka Agnieszka Iwan Krzysztof Artur Bogdanowicz Michał Filapek Natalia Górska

The structural, thermal, optical, electrochemical and photovoltaic properties were investigated to check the influence of TiO₂ on the imine properties.

10.1039/c8dt01418c

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Citations (9)

Structural Study of Nematogenic Compound 5OS5

Crystals (2024)

Aleksandra Deptuch Bartosz Sęk Sebastian Lalik Wojciech Zając M. D. Ossowska–Chruściel

The S-(4-pentylphenyl) 4-(pentyloxy)benzothioate, forming the nematic phase, is investigated by X-ray diffraction in temperatures between 263 K and 365 K, with the support of differential scanning calorimetry and polarizing optical microscopy. The microscopic observations show changes within the solid state, while X-ray diffraction does not indicate any transitions between the crystal phases. The Rietveld refinement shows that the crystal phase formed from the melt is the same monoclinic crystal phase with the P21/c space group as reported for a single crystal grown from an ethanol solution. The temperature dependence of the unit cell parameters in the 263–335 K range is determined and the coefficients of thermal expansion are obtained. The unit cell expands on heating along the longer ac-diagonal and b-axis while, along the shorter ac-diagonal, a very small shrinkage occurs. The diffraction patterns of the liquid crystalline nematic phase indicate the formation of dimers via hydrogen bonding. Density functional theory calculations (def2TZVPP basis set, B3LYP-D3(BJ) correlation-exchange functional) are applied for geometry optimization of an isolated molecule and selected dimers.

Monoclinic crystal system

Crystal (programming language)

10.3390/cryst14040367

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Citations (0)

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)

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)