Institute of Molecular Physics of the Polish Academy of Sciences

Head of group

• Prof. Dr. hab. Arkadiusz Brańka

  phone: +48 61 86 95 239, room: 233

  e-mail: arkadiusz.branka@ifmpan.poznan.pl

The group

• Dr. Eng. Natalia Bielejewska

  phone: +48 61 86 95 273, room: 257, 225, 229, 249, 226

  e-mail: natalia.bielejewska@ifmpan.poznan.pl

• Dr. Eng. Dorota Dardas

  phone: +48 61 86 95 161, room: 225, 229, 249

  e-mail: dorota.dardas@ifmpan.poznan.pl

• Dr. Eng. Sławomir Pieprzyk

  phone: +48 61 86 95 164, room: 231, 265

  e-mail: slawomir.pieprzyk@ifmpan.poznan.pl

• M. Sc. Eng. Tetiana Yevchenko

  phone: +48 61 86 95 272, room: 253

  e-mail: tetiana.yevchenko@ifmpan.poznan.pl

Notable former group members

• Prof. Dr. hab. Wojciech Kuczyński

• Dr. hab. Jerzy Hoffmann, Prof. IFM PAN

• Dr. hab. Wojciech Jeżewski, Prof. IFM PAN

Photo

Research carried out in our Laboratory concern mechanisms of formation and stabilization of liquid crystal phases. In particular the analysis of the influence of many different factors (such as electric field, temperature, defects, polymer additives and surface interactions) on the physical properties of liquid crystals is performed. Our investigations include also the development of computer simulation methods to study soft matter particle systems.

The systems under investigation are such different mezophases as: nematics, smectics, cholesterics, frustrated chiral phases (TGB, BP), ferroelectric and antiferroelectric smectics, as well as cellulose-based liotropic superstructures. Investigations are focused on the description of structural, thermodynamic, optical, dielectric, electro-optic and visco-elastic properties of these phases as a function of frequency and strength of electric field, composition of material and temperature. Moreover, the modelling of the soft matter and simple liquids with computer simulation techniques (in particular, Molecular Dynamics MD, Brownian Dynamics BD, Monte Carlo MC) is carried out.

Examples of realized tasks

1. Structural, dielectric, visco-elastic and electro-optic properties of chiral liquid crystals (blue phases especially)
2. Self-organization in the systems of soft matter (liquid crystals, colloids)
3. Nonlinear dynamic effects in surface-stabilized liquid crystals
4. The influence of surface interactions on the physical properties of thin smectic liquid crystals
5. Development of computer simulations methods (MD, BD, MC): deterministic thermostats and simulations of strongly confined particle systems
6. Simulations of structural, thermodynamic and dynamic properties of soft matter and simple liquids systems
7. Investigation of layered LC/cellulose-type structures

Research projects

• The statutory project (2016 - 2018) - Physical properties of thin liquid crystal films - dr hab. A.C. Brańka, prof. IFM PAN
• NCN project (OPUS 13) - Elastic properties of liquid crystal blue phases (2018 - 2021), project leader - dr hab. A.C. Brańka, prof. IFM PAN
• NCN project (MINIATURA 1) - Preparation and characterization of nanocrystalline cellulose/liquid crystal systems (2017/2018), project leader -  dr inż. N. Bielejewska
• Participation in the LIDER project (Edition VII) carried out by the Wood Technology Institute - New biopolymer adhesives modified with silanes and ionic liquids for application in wood-based materials technology (2017 - 2019), main worker/ investigator - dr inż. N. Bielejewska
• NCN project (OPUS 3) - Stationary states in spatially limited microscopic systems: acoustic micro-voids and stimulated microgel molecules in microchannels (2013 - 2016), project leader - dr hab. A.C. Brańka, prof. IFM PAN
• MNiSW project - Identification of a new type of de Vries phase (2010 - 2014), project leader - dr hab. J. Hoffmann, prof. IFM PAN

1. Equipment for investigations of the optical properties

1. Olympus Fluoview 1000 IX83 confocal microscope
   
   

   The dye molecules are excited using diode laser (λ = 473 nm) with the beam power equal to 1.24 mW. The fluorescence signal is detected in the spectral range 490 - 540 nm. A pinhole discriminates against the regions above and below the selected volume. The pinhole size is adjusted depending on magnification and numerical aperture of the objective.
   To obtain the 3D image of the whole sample, the focused beam scans the sample in the horizontal plane (xy-directions) and then mechanical refocusing at different depth (z-direction) in the sample and repeating the horizontal scanning. Each horizontal scan produces a thin ‘optical slice’ with thickness determined by the resolution of FCPM. The intensity of fluorescence as the function of coordinates is measured and stored in the computer memory.

2. Polarizing microscope BX53 firmy Olympus
   
   

   Experimental set-up for microscopic study of textures, phase transitions in temperature range 300 K–500 K with an accuracy of ± 0.01 K.

3. Spectrophotometer UV-VIS-NIR model V-670 (JASCO)
   
   

   Equipment for optical spectroscopy in wavelenght range 190-2700 nm.

4. Experimental set-up for investigations of birefringence of LC.
   (Hinds PEM 100 Photoelastic Modulator)
   
   

Equipment for dielectric measurements

Temperature range 300 K–500 K with an accuracy of ± 0.01 K.

1. Experimental setup I for dielectric and electrooptic measurements
   (Impedance Analyzer HP 4192A + Lock-in voltmeter SR 850).
   
   • frequency range for dielectric measurements - 5 Hz–10 MHz,
   • frequency range for electrooptic measurements - 5 Hz–100 kHz.
   
2. Experimental setup II for dielectric and electrooptic measurements
   (Impedance Analyzer Wayne Kerr 6440B + Lock-in voltmeter SR 530).
   
   • frequency range for dielectric measurements - 5 Hz–3 MHz,
   • measurements voltage 0.1 V – 10 V,
   • frequency range for electrooptic measurements - 5 Hz–100 kHz.
   
3. Experimental set-up III for investigations of spontaneous polarization and switching current of LC in frequency range
   • frequency range – 0.05 Hz–10 kHz,
   • measurements voltage - 2 V – 400 V.
   

Additional equipment

High speed video system Olympus i-SPEED 2

For each experimental setup, the Olympus high speed camera can be attached.
The speed of the microscopic image registration -2000-3000 frame/s.

• University of Stuttgart,Stuttgart, Germany (Prof. Frank Giesselmann)
• Academy of Sciences of the Czech Republic, Prague, Czech Republic (Prof. M. Glogarova, Dr V. Hamplova,Dr A. Bubnov, Dr V. Novotna)
• University of Picardy, Amiens, France (Prof. Jiri Pavel)
• Chalmers University of Technology, Göteborg, Sweden (Prof. P. Rudquist)
• Landau Institute for Theoretical Physics, Moscow, Russia (Prof. V.A. Belyakov)
• Poznan University of Technology, Institute of Physics, Poznań, Poland (Prof. P. Pierański, Prof. T. Martyński, Dr E. Chrzumnicka, Dr A. Modlińska, Dr R. Hertmanowski, Dr hab. Arkadiusz Ptak oraz dr inż. Szymon Maćkowiak)
• Military University of Technology, Department of Physics and Technology Crystals, Warsaw, Poland (Prof. R. Dąbrowski, Prof. Z. Raszewski, Prof. J. Kędzierski, Prof. P. Perkowski, Prof. W. Piecek, Prof. M. Tykarska, Prof. P. Kula)
• University of London, Royal Holloway, Department of Physics, London, UK (Prof. D. M. Heyes)
• Imperial College of London, Department of Mechanical Engineering, London, UK (Dr. D. Dini)
• Wood Technology Institute, Department of Glues and Wood-Based Materials, Poznań, Poland (Dr. D. Janiszewska)
• Faculty of Chemistry UWr, Wrocław, Poland (Prof. Zbigniew Galewski)

Publications: 2022, 2021, 2020, 2019, 2018, 2017, 2016, 2015, 2014, 2013, 2012, 2011, 2010, 2009, 2008, 2007, 2006, 2005, 2004, 2003, 2002, 2001

2022

1. T. Yevchenko, D. Dardas, W. Kuczyński, A.C. Brańka
   Determining the Kerr constant in optically isotropic liquid crystals
   Physical Review E 106, 014701 (2022)
2. S. Pieprzyk, T. Yevchenko, D. Dardas, A.C. Brańka
   Phase transitions and physical properties by a color texture analysis: Results for liquid crystals
   Journal of Molecular Liquids 362, 119699 (2022)
3. D.M. Heyes, S. Pieprzyk, A.C. Brańka
   Bulk viscosity of hard sphere fluids by equilibrium and nonequilibrium molecular dynamics simulations
   Journal of Chemical Physics 157, 114502 (2022)
4. S. Lalik, O. Stefańczyk, D. Dardas, A. Deptuch, T. Yevchenko, S.-i. Ohkoshi, M. Marzec
   Nanocomposites Based on Antiferroelectric Liquid Crystal (S)-MHPOBC Doping with Au Nanoparticles
   Molecules 27, 3663 (2022)

2021

1. S. Pieprzyk, S.B. Yuste, A. Santos, M. López de Haro, A.C. Branka
   Structural properties of additive binary hardsphere mixtures. II. Asymptotic behavior and structural crossovers
   Physical Review E 140, 024128 (2021)
2. S. Pieprzyk, S.B. Yuste, A. Santos, M. López de Haro, A.C. Brańka
   Structural properties of additive binary hard-sphere mixtures. III. Direct correlation functions
   Physical Review E 104, 054142 (2021)
3. D.M. Heyes, S. Pieprzyk, A.C. Brańka
   Application of cell models to the melting and sublimation lines of the Lennard-Jones and related potential systems
   Physical Review E 104, 044119 (2021)
4. S. Lalik, O. Stefańczyk, D. Dardas, N. Górska, S.I. Ohkoshi, M. Marzec
   Modifications of FLC physical properties through doping with Fe₂O₃ nanoparticles (Part I)
   Materials 140, 4722 (2021)
5. D. Dardas, I. Dierking
   Obituary professor Wojciech Kuczyński (1941-2020)
   Liquid Crystals Today 40, 60 (2021)
6. J. Kreisel, A. Brańka, D. Dardas, K. Roleder
   Professor Wojciech Kuczyński (1941–2020)
   Phase Transitions 40, 63 (2021)
7. N. Bielejewska, R. Hertmanowski
   Surface characterization of nanocomposite Langmuir films based on liquid crystals and cellulose nanocrystals
   Journal of Molecular Liquids, 323, 115065 (2021)

2020

1. N. Bielejewska, R. Hertmanowski
   Functionalization of LC molecular films with nanocrystalline cellulose: A study of the self-assembly processes and molecular stability
   Colloids and Surfaces B: Biointerfaces 187, 110634 (2020)
2. S. Pieprzyk, A.C. Brańka, D.M. Heyes, M.N. Bannerman
   A comprehensive study of the thermal conductivity of the hard sphere fluid and solid by molecular dynamics simulation
   Phys. Chem. Chem. Phys. 22, 8834 (2020)
3. N. Bielejewska, A.C. Brańka, S. Pieprzyk, T. Yevchenko
   Another Look at Auxeticity of 2D Square Media
   Physica Status Solidi B, 257, 2000485 (2020)
4. S. Lalik, A. Deptuch, T. Jaworska-Goła, P. Fryń, D. Dardas, O. Stefańczyk, M. Urbańska, M. Marzec
   Modification of AFLC Physical Properties by Doping with BaTiO3 Particles
   Journal of Physical Chemistry B 124, 6055-6073 (2020)
5. S. Pieprzyk, A.C. Brańka, S.B. Yuste, A. Santos, M. Lopez de Haro
   Structural properties of additive binary hard-sphere mixtures
   Physical Review E 101, 012117 (2020)

2019

1. S. Lalik, A. Deptuch, P. Fryń, T. Jaworska–Gołąb, D. Dardas, D. Pociecha, M. Urbańska, M. Tykarska, M. Marzec
   Systematic study of the chiral smectic phases of a fluorinated compound
   Liquid Crystals (2019) - online: 03 Jun 2019
2. K. Nowicka, W. Kuczyński
   Angular dependence of the linear and nonlinear electro-optic responses in a polar smectic liquid crystal
   Liquid Crystals 46, 977 (2019)
3. S. Pieprzyk, M.N. Bannerman, A.C. Brańka, M. Chudak, D.M. Heyes
   Thermodynamic and dynamical properties of the hard sphere system revisited by molecular dynamics simulation
   Phys. Chem. Chem. Phys. 21, 6886 (2019)
4. Dorota Dardas
   Tuning the electro-optic and viscoelastic properties of ferroelectric liquid crystalline materials
   Rheologica Acta 58, 193 (2019)

2018

1. W. Jeżewski
   Aggregation and fragmentation in liquids with dispersed nanoparticles
   Phys. Chem. Chem. Phys. 20, 18879 (2018)
2. K. Nowicka, N. Bielejewska
   Third-order nonlinear electro-optic measurements in the smectic smectic-C∗α phase
   Phase Transitions 91, 151 (2018)
3. S. Pieprzyk, A.C. Brańka, Sz. Maćkowiak, D.M. Heyes
   Comprehensive representation of the Lennard-Jones equation of state based on molecular dynamics simulation data
   Journal of Chemical Physics 148, 114505 (2018)
4. A.C. Brańka, S. Pieprzyk, D.M. Heyes
   Thermodynamic curvature of soft-sphere fluids and solids Phys. Rev. E 97, 022119 (2018)

2017

1. I. Śliwa, W. Jeżewski, A.V. Zakharov
   Local structural ordering in surface-confined liquid crystals
   Journal of Chemical Physics, 146, 24, 244704 (2017)
2. I. Śliwa, A.V. Zakharov
   Diffusion processes in freely suspended smectic films
   Physics of The Solid State, 59, 8, 1648-1655 (2017)
3. P. Perkowski, W. Kuczynski, K. Roleder
   Editorial Note
   Phase Transitions, 90, 8, SI, 763-764 (2017)
4. M. Knapkiewicz, M. Sądej, W. Kuczyński, A. Rachocki
   Effect of polymer network on thermodynamic stability and switching behavior of the smectic-C∗α phase
   Physical Review E 96, 052702 (2017)
5. Sz. Maćkowiak, D.M. Heyes, S. Pieprzyk, D. Dini, A.C. Brańka
   Non-Equilibrium Phase Behavior of Confined Molecular Films at Low Shear Rates
   Physica Status Solidi B, 1600862, (2017)
6. D.M. Heyes, D. Dini, E.R. Smith, A.C. Brańka
   Nanowire Stretching by Non-Equilibrium Molecular Dynamics
   Physica Status Solidi B, 1600861, (2017)
7. Sz. Maćkowiak, S. Pieprzyk, A.C. Brańka, D.M. Heyes
   A Nosé-Hoover Thermostat Adapted to a Slab Geometry
   Computational Methods in Science and Technology  23 (3), 211 (2017)
8. K. Nowicka, M. Piosik, W. Kuczyński, A.C. Brańka
   Improvement of the blue phase stability in chiral nematic liquid crystal mixtures
   Phase Transitions 90, 95-98 (2017)
9. S. Pieprzyk, A.C. Brańka, D.M. Heyes
   Representation of the direct correlation function of the hard-sphere fluid
   Phys. Rev. E 95, 062104 (2017)
10. I. Śliwa, A.V. Zakharov
    Translational diffusion across a free-standing smectic film above the bulk smectic-A–isotropic transition temperature
    Phys. Rev. E 95, 012704 (2017)
11. I. Śliwa, A.V. Zakharov
    Диффузионные процессы в свободно подвешенных смектических пленках
    Fizika Tverdogo Tela 59, 1624 (2017)

2016

1. N. Bielejewska
   Orientational order of spme liquid crystal/dye mixtures obtained from optical birefringence
   Phase Transitions 89, p.359-367 (2016)
2. D. Dardas
   Electro-optic and viscoelastic properties of a ferroelectric liquid crystalline binary mixture
   Phase Transitions 89, p.368-375 (2016)
3. I. Niezgoda, E. Szypszak, D. Dardas, Z. Galewski
   Influence of the ester chain length on the mesogenic behavior and optical anisotropy of 4-[[4-(butoxy)phenyl]phenyl alkanoates
   Phase Transitions 89, p.393-402 (2016)
4. A. Dłubacz, M. Marzec, D. Dardas, M. Żurowska
   New antiferroelectric liquid crystal for use in LCD
   Phase Transitions 89, p. 349-358 (2016)
5. Dominika Janiszewska, Iwona Frąckowiak, Natalia Bielejewska
   Application of Selected Agents for Wood Liquefaction and Some Properties of Particleboards Produced wit the Use of Liquefied Wood
   DOI: 10.12841/wood.1644-3985.C37.01 Wood. Research Papers, Reports, Announcements, 59, 197, 223-230 (2016)
6. M. Bielejewski, K. Nowicka, N. Bielejewska, J. Tritt-Goc
   Ionic Conductivity and Thermal Properties of a Supramolecular Ionogel Made from a Sugar-Based Low Molecular Weight Gelator and a Quaternary Ammonium Salt Electrolyte Solution
   Fournal of the Electrochemical Society, 163 (13), G187-G195 (2016)
7. K. Nowicka, W. Kuczyński
   Non-linear electro-optical effects in the study of the helical smectic liquid crystals
   Phase Transitions 89, p. 376-382 (2016)
8. I. Śliwa, W. Jeżewski, A.V. Zakharov
   The effect of surfaces on molecular ordering in thin liquid-crystal systems
   Journal of Chemical Physics 145, 084905 (2016)
9. D.M. Heyes, G. Rickayzen, S. Pieprzyk, A.C. Brańka
   The second virial coefficient and critical point behavior of the Mie Potential
   Journal of Chemical Physics 145, 084505 (2016)
10. K. Nowicka, M. Knapkiewicz, N. Bielejewska, D. Dardas, W. Kuczyński, J. Hoffmann
    Application of second-harmonic electro-optical measurements in the study of polar liquid crystal phases
    Liquid Crystals, 43, no. 12, 1778–1783 (2016)
11. W. Jeżewski
    Effect of long-range interactions on nanoparticle-induced aggregation
    Phys. Chem. Chem. Phys. 18, 22929 (2016)
12. I. Śliwa, W. Jeżewski, W. Kuczyński
    Electric-field-induced weakly chaotic transients in ferroelectric liquid crystals
    Phys. Rev. E 93, 012702 (2016)
13. K. Nowicka
    Linear and non-linear electro-optical measurements in the study of polar liquid crystal phases
    Liquid Crystals 43, p.1276-1281 (2016)
14. Sz. Maćkowiak, D.M. Heyes, D. Dini, A.C. Brańka
    Non-equilibrium phase behavior and friction of confined molecular films under shear: A non-equilibrium molecular dynamics study
    Journal of Chemical Physics 145, 164704 (2016)
15. I. Śliwa
    Optical reflectance in free-standing smectic films, Chemical
    Physics Letters 648, 36, 2016
16. S. Pieprzyk, D.M. Heyes, A.C. Brańka
    Spatially dependent diffusion coefficient as a model for pH sensitive microgel particles in microchannels
    Biomicrofluidics 10, 054118 (2016)
17. I. Śliwa, A.A. Vakulenko, A.V. Zakharov
    Squeezing-out dynamics in free-standing smectic films
    Physics Letters A 380, 1811-1816 (2016)
18. Natalia Bielejewska, Dominika Janiszewska
    The Spectral Analysis of Absorption and Fluorescence Parameters of Liquefied Wood Treated with Different Solvents
    Ann. WULS - SGGW, Forestry and Wood Technol., 94, 304-307 ISSN, 1898-5912 (2016)
19. I. Śliwa, A.V. Zakharov, A.A. Vakulenko
    Динамика послойного утоньшения свободно подвешенных смектических пленок
    Fizika Tverdogo Tela 58, 1419 (2016)
    Dynamics of layer-by-layer thinning of free-standing smectic films
    Physics of the Solid State 58, 7, 1469-1475 (2016)

2015

1. I. Śliwa, A.V. Zakharov
   Surface tension, disjoining pressure and layer compression of free-standing smectic films in water
   Chem. Phys. Lett. 620, 98 (2015)
2. S. Pieprzyk, D.M. Heyes, Sz. Maćkowiak, A.C. Brańka
   Galilean-invariant Nosé-Hoover-type thermostats
   Phys. Rev. E 91, 033312 (2015)
3. A.V. Zakharov, I. Śliwa
   Squeezing-out dynamics in free-standing smectic films
   J. Chem. Phys. 142, 214703 (2015)
4. D.M. Heyes, A.C. Brańka
   The Lennard-Jones melting line and isomorphism
   J. Chem. Phys. 143, 234504 (2015)
5. W. Kuczyński, J. Hoffmann, D. Dardas, K. Nowicka, N. Bielejewska
   Flexo- and piezo-electric polarization of smectic layers in ferroelectric and antiferroelectric liquid crystals
   Appl. Phys. Lett. 107, 191908 (2015)
6. W. Jeżewski
   Kinnetics of aggregation in liquids with dispersed nanoparticles
   Phys. Chem. Chem. Phys. 17, 8828 (2015)
7. D.M. Heyes, D. Dini, A.C. Brańka
   Scaling of Lennard-Jones liquid elastic moduli, viscoelasticity and other properties along fluid-solid coexistence
   Phys. Status Solidi B 252, No 7, 1514 (2015)
8. D.M. Heyes, P. Turner, R.J. English, R. Williams, A.C. Brańka
   Second virial coefficient of rod-shaped molecules and molecular dynamics simulations of the isotropic phase
   Phys. Rev. E 91, 042134 (2015)

2014

1. C. Gattinoni, Sz. Maćkowiak, D.M. Heyes, A.C. Brańka, D. Dini
   Boundary-controlled barostats for slab geometries in molecular dynamics simulations
   Phys. Rev. E 90, 043302 (2014)
2. K. Nowicka, D. Dardas, W. Kuczyński, V.A. Belyakov, D.V. Shmeliova
   Director distribution and surface anchoring potential in Grandjean-Cano wedge
   Liquid Crystals, 41, 1448-1454, 2014
3. J. Hoffmann, K. Nowicka, W. Kuczyński, N. Bielejewska
   Experimental Evidence of the Soft Mode in Smectic C_a^* phase of  chiral ferroelectric liquid crystals
   Soft Matter, 2014, 10, 8548
4. K. Nowicka, N. Bielejewska, W. Kuczyński, M. Knapkiewicz, J. Hoffmann
   Exploration of liquid crystal structures using fluorescent confocal polarizing microscopy
   Phase Transitions, 2014, http://dx.doi.org/10.1080/01411594.2014.953950
5. K. Nowicka
   A reliable method for detecting phase transitions in liquid crystals with polar order
   Liquid Crystals 41, 197-201 (2014)
6. K. Nowicka, N. Bielejewska, J. Hoffmann, W. Kuczyński
   Nonlinear electro-optical spectroscopy of liquid crystals possesing polar order
   Phase Transitions 87, 770-776 (2014)
7. S. Pieprzyk, D.M. Heyes, A.C. Brańka
   Thermodynamic properties and entropy scaling law for diffusivity in soft spheres
   Physical Review E 90, 012106, 2014
8. W. Jeżewski
   Complex superstructures in chiral liquid crystals: surface-induced helix destruction
   Physical Review E 89, 032501, 2014

2013

1. K. Nowicka, D. Dardas, K. Garbat
   High permittivity of chiral tilted smectic phases in a binary mixture
   Phase Transitions, 86(2-3), 153 (2013)
2. D. Dardas, K. Nowicka, W. Kuczyński
   Examination if three new fluorinated tilted smectics
   Phase Transitions, 86(2-3), 147 (2013)
3. M. Iwamoto, I. Śliwa, A.A. Vakulenko, A.V. Zakharov
   Field-induced dependence of rotational diffusion processes in smectic films deposited on a solid surface
   Chem. Phys. Lett. 566 (2013), 32-37
4. W. Jeżewski, I. Śliwa, W. Kuczyński
   Strongly nonlinear dynamics of ferroelectric liquid crystals
   The European Physical Journal E 36, 2, 2013

2012

1. W. Kuczyński, D. Dardas, J. Hoffmann, K. Nowicka, W. Jeżewski
   Comparison of methods for determination of viscoelastic properties in chiral smectics C^*
   Phase Trans. 85, 358-363 (2012)
2. I. Śliwa, W. Wanarski
   Model of temperature dependence of spontaneous polarization of thiourea monocrystal in phase I
   Acta Physica Polonica A 122, 184 (2012)
3. W. Jeżewski
   Effect of intralayer inhomogeneity on helical superstructures of liquid crystals
   Physical Review E 85, 051702 (2012)
4. I. Śliwa, W. Jeżewski, W. Kuczyński, J. Hoffmann
   Solitons in surface stabilized ferroelectric liquid crystals and the determination of the twist elastic constant
   Phase Trans. 85, 345-352 (2012)
5. M. Iwamoto, I. Śliwa, A.V. Zakharov
   Field-induced dependence of anchoring energy and surface tension in smectic liquid crystal films deposited on a solid surface
   Chemical Physics Letters 534, 23 (2012)
6. I. Śliwa, K. Grygiel
   Periodic orbits, basins of attraction and chaotic beats in two coupled Kerr oscillators
   Nonl. Dynamics 67, 755-765 (2012)

2011

1. A. Modlińska, D. Dardas, J. Jadżyn, D. Bauman
   Characterization of some fluorinated mesogens for application in liquid crystal displays.
   Mol. Cryst. Liq. Crystals 542, 28-36, 2011
2. I. Śliwa, W. Wanarski
   The model of ferroelectricity in thiourea,
   Acta Physica Polonica A 120, 516 (2011)
3. M. Geppi, A. Marini, B. Mennucci, P. Kula, A. Spadło, W. Kuczyński, S. Urban
   Determination of order parameters in lateralny fluorosubstituted terphenyls by ¹⁹F-NMR, optical and dielectric anisotropies,
   Mol. Cryst. Liq. Crystals  541,  104 (2011)
4. W. Kuczyński, K. Nowicka, D. Dardas, W. Jeżewski, J. Hoffmann
   Determination of viscoelastic properties in a chiral smectic C liquid using different methods,
   Mol. Cryst. Liq. Crystals  544,  65 (2011)
5. K. Pogorzelec-Glaser, A. Pietraszko, J. Baran, B. Hilczer, J. Małecki, M. Połomska, P. Ławniczak
   Structure and molecular dynamics of bis-1H-1,2,4-triazole succinic acid complex crystals
   CrystEngComm 13, 3698-3709, 2011
6. D. Dardas, W. Kuczyński, J. Hoffmann, W. Jeżewski
   Determination of twist elastic constant in antiferroelectric liquid crystals,
   Measurement Science and Technology 22, 085707 (2011)
7. W. Jeżewski, W. Kuczyński, J. Hoffmann
   Solitons induced by alternating electric fields in surface-stabilized ferroelectric liquid crystals,
   Physical Review E 83, 042701 (2011)

2010

1. W. Jeżewski, W. Kuczyński, D. Dardas, K. Nowicka, J. Hoffmann
   Field-induced dynamics of ferroelectric liquid crystals with elastic interfacial confinement.
   Soft Matter 6, 2786-2792, 2010
2. W. Kuczyński
   Behavior of the helix in some chiral smectic-C^* liquid crystals.
   Physical Review E 81, 021708, 2010
3. W. Kuczyński, K. Nowicka, D. Dardas, W. Jeżewski, J. Hoffmann
   Determination of bulk values of twist elasticity coefiicient in a chiral smectic C^* liquid crystal.
   Opto-Electronics Review 18(2), 176-180, 2010

2009

1. W. Jeżewski, W. Kuczyński
   Defect dynamics in ferroelectric liquid crystals of the chevron structure.
   Physical Review B 79, 214206, 2009
2. W. Kuczyński, D. Dardas, K. Nowicka
   Determination of the bulk rotational viscosity coefficient in a  chiral smectic C^* liquid crystal.
   Phase Transitions Vol. 82, No. 6, 444-451, 2009
3. D. Dardas, W. Kuczyński, J. Hoffmann, W. Jeżewski, K. Nowicka, J. Małecki
   Non-linear electrooptic effect in antiferroelectric liquid crystal.
   Opto-Electronics Review 17(1), 25-29, 2009
4. I. Śliwa, P. Szlachetka, K. Grygiel
   Coexisting solutions and their chaotic neighborhood in the dynamical systems of nonlinear optics.
   Nonlinear Dynamics 57, 143-156, 2009
5. K. Żygadło, D. Dardas, K. Nowicka, J. Hoffmann, Z. Galewski
   Liquid-crystalline polymorphism of symmetrial azobananas: bis)4-(4-alkylphenyl)azopheny) 2-nitroisophtalates.
   Molecular Cryststals and Liquid Crystals, vol. 509, 283-291, 2009
6. S. Borsacchi, L. Calucci, J. Czub, R. Dąbrowski, M. Geppi, W. Kuczyński, A. Marini, B. Mennucci, S. Urban
   Orientational order of fluorinated mesogens containing 1,3,2-dioxaborinane ring: A multidisciplinary approch.
   Journal of Physical Chemistry B 15783-15794 (2009)
7. W. Jeżewski, K.W. Wojciechowski
   Nonlinear dielectric relaxation in the isotropic phase and mesophases of cholesteryl oleyl carbonate.
   Journal of Physical Chemistry B 113, 9123-9128, 2009
8. M. Heyes, S.M. Clarke and A.C. Brańka
   Soft-sphere soft glasses.
   Journal of Chemical Physics 131, 204506, 2009

2008

1. W. Jeżewski, W. Kuczyński, J. Hoffmann
   Creep dynamics of structural defects in ferroelectric liquid crystals with chevron geometry.
   Physical Review B 77, 094101, 2008
2. W. Jeżewski, W. Kuczyński, J. Hoffmann, D. Dardas
   Comarison of dielectric and optical responses of chevron ferroeelctric liquid crystals.
   Opto-Electronic Review 16(3), 282-286, 2008
3. V.A. Belyakov, W. Kuczyński
   Motion of nonsigular walls in plane layer of twisted nematics.
   Molecular Crystals and Liquid Crystals Vol. 480, 243-261, 2008
4. M. Geppi, A. Marini, C.A. Veracini, S. Urban, J. Czub, W. Kuczyński, R. Dąbrowski
   Orientational order of difluorinated liquid crystals: a comparative ¹³C-NMR, optical, and dielectric study in nematic and smectic B phases.
   Journal of Physical Chemistry B 112, 9663-9676, 2008

2007

1. W. Jeżewski
   On the emergence of scaling in weighted networks.
   Physica A 379, 691-700, 2007
2. J. Hoffmann, F. Giesselmann, W. Kuczyński
   Experimental evidence of the electric-field induced critical behaviour of the smectic C* - alpha phase.
   Phase Transitions Vol. 80, No. 8, 841-849, 2007
3. W. Jeżewski, W. Kuczyński, J. Hoffmann
   Dielectric versus optical response in chevron ferroelectric liquid crystals.
   Liquid Crystals 34, 1299-1306 (2007)

2006

1. W. Jeżewski, W. Kuczyński, J. Hoffmann
   Dielectric relaxation in chevron surface stabilized ferroelectric liquid crystals.
   Physical Review E 73, 061702, 2006
2. D. Dardas, W. Kuczyński, J. Hoffmann
   Measurements of absolute values of electrooptic coefficients in a ferroelectric liquid crystal.
   Phase Transitions Vol. 79, No. 3, 213-222, 2006
3. P. Zugenmaier, W. Kuczyński
   Comparison of the crystal and molecular structures of three similar 4-heptyl-biphenyl compounds: 4-heptyl-4’-cyanobiphenyl, 4-heptyl-3’-cyanobiphenyl, and 4-heptyl-4’-nitrobiphenyl.
   Molecular Crystals and Liquid Crystals Vol. 457, p. 93-103, 2006
4. J.A. Małecki, J. Nowak
   Dielectric studies of molecular interactions in benzene solutions of 4-heptyl-4’-nitro-biphenyl.
   Journal of Molecular Liquids 129, 164-168, 2006
5. M.B. Pandey, R. Dhar, W. Kuczyński
   Dielectric Investigations of induced twist grain boundary phase in the binary mixtures of cholesterol benzoate and di-heptyloxyazoxybenzene.
   Ferroelectrics, 343, 69-82, 2006
6. F .Goc, Ch. Blanc, V. Lorman, M. Nobili, S. Samaritani, G. Galli, W. Kuczyński
   X-ray and electrooptical studies of liquid crystal siloxane with a de vries SmA* phase.
   Ferroelectrics, 343, 101-110, 2006

2005

1. W. Kuczyński, J. Hoffmann
   Determination of piezoelectric and flexoelectric polarization in ferroelectric liquid crystals.
   Physical Review E 72, 041701-1 do 041701-6, 2005
2. W. Jeżewski
   Scale-free properties of weghted networks with connectivity-driven topology.
   Physica A 354, 2005, 672-680
3. V.A. Belyakov, W. Kuczyński
   Surface anchoring and twisting of thin nematic layers influenced by thermal fluctuations.
   Molecular Crystals and Liquid Crystals 438, 123[1687]-140[1704], 2005

2004

1. J.A. Małecki
   Phenomenological model of nonlinear dielectric losses related to the intrinsic conductivity of dielectrics
   The European Physical Journal B 39, 235-240 (2004)
2. J.A. Małecki
   Nonlinear dielectric losses and dynamics of intrinsic conductivity of dielectrics in “Nonlinear Dielectric Phenomena in Complex Liquids” eds. S.J.Rzoska and V.P.Zhelezny
   Kluwer Academic Publishers, 77-88 (2004)
3. J. Hoffmann
   Extension of Maier-Meier Model on Cholesteric Liquid Crystals
   Acta Physica Polonica A, 105, 373-381 (2004)
4. W. Jeżewski
   Scaling in weighted networks and complex systems
   Physica A 337, 336-356 (2004)
5. D. Dardas, W. Kuczyński
   Non-linear electrooptical effects in chiral liquid crystals
   Opto-Electronics Review 12(3), 277-280 (2004)

2003

1. W. Kuczyński, J. Małecki
   Dielectric Relaxation in Liquid Crystal Phases with Polar Order
   Ferroelectrics , 296, 1-15 (2003)
2. W. Kuczyński
   Przejścia fazowe w ciekłych kryształach
   Przemiany fazowe, A. Graja, A.R. Ferchmin (Eds.) Ośrodek Wydawnictw Naukowych OWN Poznań (2003), 65-77
3. W. Kuczyński
   Electrooptical studies of relaxation processes in chiral smectic liquid crystals
   Relaxation Phenomena (Liquid Crystals, Magnetic Systems, Polymers, High-Tc Superconductors, Metalic Glasses) Eds. W. Haase, S. Wróbel, 422-444, Springer Verlag Berlin, Heidelberg, 2003)
4. W. Kuczyński, F. Goc
   Metastable states in liquid-crystalline mixtures
   Liquid Crystals, 30 (6), 701-709 (2003)
5. J. Hoffmann
   Determination of the Dielectric Anisotropy of Cholesteric Liquid Crystals
   Acta Physica Polonica A, 103, 41-46 (2003)
6. S. Urban, B. Gestblom, W. Kuczyński, S. Pawlus, A. Würflinger
   Nematic order parameter as determined from dielectric relaxation data and other methods
   Phys, Chem. Chem. Phys. 5, 924-928 (2003)

2002

1. W. Kuczyński, F. Goc, D. Dardas, R. Dąbrowski, J. Hoffmann, B. Stryła, J. Małecki
   Phase transitions in a liquid crystal with long-range dipole order
   Ferroelectrics, 274, 83-100 (2002)
2. J. Małecki, J. Nowak
   Linear and Nonlinear Dielectric Properties of 4-Heptyl-4’-Cyano-biphenyl Solutions in Benzene
   Polish J. Chem., 76, 435 (2002)
3. W. Jeżewski
   Stationary and nonstationary properties of evolving networks with preferential linkage
   Phys. Rev. E 66, 067102 1-4 (2002)
4. W. Jeżewski
   Singularity spectra of strongly inhomogeneous multifractals
   Eur. Phys. J. B 26, 473-478 (2002)
5. W. Kuczyński, B. Żywucki, J. Małecki
   Determination of orientational order parameter in various liquid-crystalline phases
   Mol. Cryst. Liq. Cryst., 381, 1-19 (2002)

2001

1. W. Kuczyński, F. Goc, R. Dąbrowski
   Kinetics of the transition between ferroelectric and antiferroelectric states in liquid-crystalline mixtures
   Mol. Cryst. Liq. Cryst., 366, 771-784 (2001)
2. J. Małecki
   Dynamics of the Radiation-induced Conductivity in Presence of Spatial Charge
   J. Electrostatics, 50/2, 109 (2001)
3. W. Jeżewski
   Multiscaling and multifractality in an one-dimensional Ising model
   Eur. Phys. J. B 19, 133-138 (2001)
4. W. Jeżewski
   Complex multifractal measures and a generalized multifractal formalism
   Physica A 298, 419-430 (2001)
5. R. Dąbrowski, W. Drzewiński, K. Czupryński, S. Gauza, K. Kenig, W. Kuczyński, F. Goc
   Systems with enhanced antiferroelectric phase. Phase diagrams, dielectric and electro-optic studies
   Mol. Cryst. Liq. Cryst., 365, 199-211 (2001)
6. S. Gauza, K. Czupryński, R. Dąbrowski, W. Kuczyński, D. Pociecha
   Bicomponent system with induced antiferroelectric SmCA* phase
   Mol. Cryst. Liq. Cryst., 365, 189-198 (2001)