prof. UAM dr hab. Mikołaj Pochylski

@article{Varghese2023,

title = {Size-dependent nanoscale soldering of polystyrene colloidal crystals by supercritical fluids},

author = {Jeena Varghese and Reza Mohammadi and Mikołaj Pochylski and Visnja Babacic and Jacek Gapiński and Nicolas Vogel and Hans-Juergen Butt and George Fytas and Bartłomiej Graczykowski},

url = {https://authors.elsevier.com/c/1gA9Z4-sDXVRI},

doi = {10.1016/j.jcis.2022.11.090},

year  = {2023},

date = {2023-03-01},

urldate = {2023-03-01},

journal = {Journal of Colloid and Interface Science},

volume = {633},

pages = {314--322},

publisher = {Elsevier BV},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Szewczyk2022,

title = {In-situ thickness control of centimetre-scale 2D-Like polydopamine films with large scalability},

author = {Jakub Szewczyk and Mikołaj Pochylski and Kosma Szutkowski and Mateusz Kempiński and Radosław Mrówczyński and Igor Iatsunskyi and Jacek Gapiński and Emerson Coy},

url = {https://doi.org/10.1016/j.mtchem.2022.100935},

doi = {10.1016/j.mtchem.2022.100935},

year  = {2022},

date = {2022-06-01},

urldate = {2022-06-01},

journal = {Materials Today Chemistry},

volume = {24},

pages = {100935},

publisher = {Elsevier BV},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Ciar2022,

title = {2D Short-Time Fourier Transform for local morphological analysis of meibomian gland images},

author = {Kamila Ciężar and Mikołaj Pochylski},

editor = {Michele Madigan},

url = {https://doi.org/10.1371/journal.pone.0270473},

doi = {10.1371/journal.pone.0270473},

year  = {2022},

date = {2022-06-01},

urldate = {2022-06-01},

journal = {PLOS ONE},

volume = {17},

number = {6},

pages = {e0270473},

publisher = {Public Library of Science (PLoS)},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Vasileiadis2021b,

title = {Fast Light-Driven Motion of Polydopamine Nanomembranes},

author = {Thomas Vasileiadis and Tommaso Marchesi DÁlvise and Clara-Magdalena Saak and Mikołaj Pochylski and Sean Harvey and Christopher V. Synatschke and Jacek Gapiński and George Fytas and Ellen H. G. Backus and Tanja Weil and Bartłomiej Graczykowski},

url = {https://doi.org/10.1021/acs.nanolett.1c03165},

doi = {10.1021/acs.nanolett.1c03165},

year  = {2022},

date = {2022-01-01},

journal = {Nano Letters},

volume = {22},

number = {2},

pages = {578--585},

publisher = {American Chemical Society (ACS)},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{CALANDRA2021114963,

title = {Non-ideal mixing behavior in dibutyl phosphate-propylamine binary liquids: Dielectric and nuclear magnetic resonance investigations},

author = {Pietro Calandra and Vincenzo Turco Liveri and Noemi Proietti and Donatella Capitani and Domenico Lombardo and Catalin Gainaru and Roland Böhmer and Maciej Kozak and Maria Dobies and Zbigniew Fojud and Mikołaj Pochylski},

url = {https://www.sciencedirect.com/science/article/pii/S0167732220372056},

doi = {https://doi.org/10.1016/j.molliq.2020.114963},

issn = {0167-7322},

year  = {2021},

date = {2021-01-01},

journal = {Journal of Molecular Liquids},

volume = {323},

pages = {114963},

abstract = {Owing to the amphiphilic nature of their constituent molecules, binary mixtures of pure liquid surfactants are usually characterized by enhanced nano-segregation and thus can exhibit interesting transport properties and complex macroscopic behavior. In this ambit it was recently shown by Turco Liveri et al. (J. Mol. Liq. 263 (2018) 274–281) at room temperature that mixtures of short aliphatic chains compounds, such as dibutyl phosphate (DBP) and n-propylamine (PA) liquids, due to their ability to allow for phosphate-to-amine proton transfer, display ionic liquid–like behavior with composition-dependent enhanced conductivity, viscosity, and magnetically-induced birefringence. To understand the molecular mechanisms at the basis of this behavior, in the present study a combination of nuclear magnetic resonance (NMR) and dielectric spectroscopy investigations has been carried out for the same materials for different amine molar ratios. It was found that at certain compositions all studied dynamical processes (conformational changes, local hopping of “free” protons among neighboring polar headgroups, long-range charge migration) exhibit significant deviations from ideal mixing behavior. The microscopic origin of these deviations is discussed.},

keywords = {-propyl amine, Decoupling of dynamical processes, Dibutyl phosphate, Ionic liquids, liquid mixtures, self-assembly},

pubstate = {published},

tppubtype = {article}

}

@article{Ciar2020,

title = {2D fourier transform for global analysis and classification of meibomian gland images},

author = {Kamila Ciężar and Mikołaj Pochylski},

url = {https://doi.org/10.1016/j.jtos.2020.09.005},

doi = {10.1016/j.jtos.2020.09.005},

year  = {2020},

date = {2020-10-01},

journal = {The Ocular Surface},

volume = {18},

number = {4},

pages = {865--870},

publisher = {Elsevier BV},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{BABACIC2020786,

title = {Mechanical reinforcement of polymer colloidal crystals by supercritical fluids},

author = {Višnja Babačić and Jeena Varghese and Emerson Coy and Eunsoo Kang and Mikołaj Pochylski and Jacek Gapiński and George Fytas and Bartłomiej Graczykowski},

url = {http://www.sciencedirect.com/science/article/pii/S0021979720308493},

doi = {https://doi.org/10.1016/j.jcis.2020.06.104},

issn = {0021-9797},

year  = {2020},

date = {2020-01-01},

journal = {Journal of Colloid and Interface Science},

volume = {579},

pages = {786 - 793},

abstract = {Colloidal crystals realized by self-assembled polymer nanoparticles have prominent attraction as a platform for various applications from assembling photonic and phononic crystals, acoustic metamaterials to coating applications. However, the fragility of these systems limits their application horizon. In this work the uniform mechanical reinforcement and tunability of 3D polystyrene colloidal crystals by means of cold soldering are reported. This structural strengthening is achieved by high pressure gas (N2 or Ar) plasticization at temperatures well below the glass transition. Brillouin light scattering is employed to monitor in-situ the mechanical vibrations of the crystal and thereby determine preferential pressure, temperature and time ranges for soldering, i.e. formation of physical bonding among the nanoparticles while maintaining the shape and translational order. This low-cost method is potentially useful for fabrication and tuning of durable devices including applications in photonics, phononics, acoustic metamaterials, optomechanics, surface coatings and nanolithography.},

keywords = {Brillouin light scattering, Colloidal crystals, Phononic crystals, Photonic crystals, Plasticization},

pubstate = {published},

tppubtype = {article}

}

@article{Pochylski2019b,

title = {Optical Birefringence Growth Driven by Magnetic Field in Liquids: The Case of Dibutyl Phosphate/Propylamine System},

author = {Mikołaj Pochylski and Domenico Lombardo and Pietro Calandra},

url = {https://www.mdpi.com/2076-3417/10/1/164},

doi = {10.3390/app10010164},

issn = {2076-3417},

year  = {2020},

date = {2020-01-01},

urldate = {2019-12-01},

journal = {Applied Sciences},

volume = {10},

number = {1},

pages = {164},

abstract = {Magnetically-induced birefringence is usually low in molecular liquids owing to the low magnetic energy of molecules with respect to the thermal one. Despite this, it has been found that a mixture of dibutyl phosphate and propylamine at propylamine molar ratio (X) around 0.33 surprisingly gives an intense effect (∆n/$łambda$ ≈ −0.1 at 1 Tesla). In this paper the time- and intensity- response to the magnetic field of such mixture have been studied. It was found that the reaction to the magnetic field is unusually slow (from several minutes to hours) depending of the magnetic field intensity. On the basis of the data, the model of orientable dipoles dispersed in a matrix enables to interpret the magnetic field-induced self-assembly in terms of soft molecules-based nanostructures. The analogy with systems made of magnetically polarizable (solid or soft) particles dispersed in liquid carrier allows understanding, at the microscopic scale, the molecular origin and the supra-molecular dynamics involved in the observed behavior. The data present a novel phenomenon in liquid phase where the progressive building up/change of ordered and strongly interacting amphiphiles is driven by the magnetic field.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Pochylski:19,

title = {Structural relaxation in the wave-vector dependence of the longitudinal rigidity modulus},

author = {Mikołaj Pochylski},

url = {http://www.osapublishing.org/boe/abstract.cfm?URI=boe-10-4-1957},

doi = {10.1364/BOE.10.001957},

year  = {2019},

date = {2019-04-01},

journal = {Biomed. Opt. Express},

volume = {10},

number = {4},

pages = {1957--1964},

publisher = {OSA},

abstract = {Brillouin microscopy recently attracted much attention for being a promising tool for all-optical label-free determination of mechanical properties of biological samples. Before its widespread utilization for biomedical applications, numbers of nuances related with this technique need to be recognized. In this article, we discuss the process of structural relaxation, the phenomena not commonly addressed by the emerging bio-Brillouin community, and its effect on longitudinal rigidity modulus. Using a model aqueous polymer mixture, we show how scattering measurements performed on the same specimen using different experimental geometries can lead to different results.},

keywords = {Brillouin scattering; Inelastic scattering; Laser beams; Laser scattering; Refractive index; Scattering measurements},

pubstate = {published},

tppubtype = {article}

}

@article{POCHYLSKI201951,

title = {Nature of intramolecular dynamics in protic ionic glass-former: insight from ambient and high pressure Brillouin spectroscopy},

author = {Mikołaj Pochylski and Jacek Gapiński and Z Wojnarowska and M Paluch and Adam Patkowski},

url = {http://www.sciencedirect.com/science/article/pii/S0167732219302417},

doi = {https://doi.org/10.1016/j.molliq.2019.02.131},

issn = {0167-7322},

year  = {2019},

date = {2019-01-01},

journal = {Journal of Molecular Liquids},

volume = {282},

pages = {51 - 56},

abstract = {Proton conducting materials play an important role in a variety of electrochemical devices. Especially, the class of protic ionic glass-formers with fast water-independent proton transport within the Grotthuss mechanism has been envisioned as promising fuel cell electrolytes. Nevertheless, despite a number of reports on protic ionic glasses the description of proton transport phenomenon in these systems is still incomplete. Herein, we employed the Brillouin scattering technique to investigate the intramolecular dynamics of acebutolol hydrochloride, protic ionic glass-former with isomerization ability. The studies performed at ambient and elevated pressure revealed the fast relaxation dynamics that may control the proton conductivity, especially at temperatures T < Tg where the vehicle mechanism contribution is negligible.},

keywords = {Brillouin scattering, High pressure, Intramolecular dynamics, Ionic liquids},

pubstate = {published},

tppubtype = {article}

}

@article{Koralewski2018,

title = {Morphology and Magnetic Structure of the Ferritin Core during Iron Loading and Release by Magnetooptical and NMR Methods},

author = {Marceli Koralewski and Lucia Balejčíková and Zuzana Mitróová and Mikołaj Pochylski and Mikołaj Baranowski and Peter Kopčanský},

url = {https://doi.org/10.1021/acsami.7b18304},

doi = {10.1021/acsami.7b18304},

year  = {2018},

date = {2018-01-01},

journal = {ACS Applied Materials & Interfaces},

volume = {10},

number = {9},

pages = {7777-7787},

abstract = {Ferritins are proteins, which serve as a storage and transportation capsule for iron inside living organisms. Continuously charging the proteins with iron and releasing it from the ferritin is necessary to assure proper management of these important ions within the organism. On the other hand, synthetic ferritins have great potential for biomedical and technological applications. In this work, the behavior of ferritin during the processes of iron loading and release was examined using multiplicity of the experimental technique. The quality of the protein’s shell was monitored using circular dichroism, whereas the average size and its distribution were estimated from dynamic light scattering and transmission electron microscopy images, respectively. Because of the magnetic behavior of the iron mineral, a number of magnetooptical methods were used to gain information on the iron core of the ferritin. Faraday rotation and magnetic linear birefringence studies provide evidence that the iron loading and the iron-release processes are not symmetrical. The spatial organization of the mineral within the protein’s core changes depending on whether the iron was incorporated into or removed from the ferritin’s shell. Magnetic optical rotatory dispersion spectra exclude the contribution of the Fe(II)-composed mineral, whereas joined magnetooptical and nuclear magnetic resonance results indicate that no mineral with high magnetization appear at any stage of the loading/release process. These findings suggest that the iron core of loaded/released ferritin consists of single-phase, that is, ferrihydrite. The presented results demonstrate the usefulness of emerging magnetooptical methods in biomedical research and applications.},

note = {PMID: 29417811},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Wojnarowska2017,

title = {Experimental evidence of high pressure decoupling between charge transport and structural dynamics in a protic ionic glass-former},

author = {Z Wojnarowska and M Rams-Baron and J Knapik-Kowalczuk and Agnieszka Połatyńska and Mikołaj Pochylski and Jacek Gapiński and Adam Patkowski and P Wlodarczyk and M Paluch},

url = {http://www.nature.com/articles/s41598-017-07136-5},

doi = {10.1038/s41598-017-07136-5},

issn = {2045-2322},

year  = {2017},

date = {2017-12-01},

journal = {Scientific Reports},

volume = {7},

number = {1},

pages = {7084},

publisher = {Nature Publishing Group},

abstract = {textcopyright 2017 The Author(s). In this paper the relaxation dynamics of ionic glass-former acebutolol hydrochloride (ACB-HCl) is studied as a function of temperature and pressure by using dynamic light scattering and broadband dielectric spectroscopy. These unique experimental data provide the first direct evidence that the decoupling between the charge transport and structural relaxation exists in proton conductors over a wide T-P thermodynamic space, with the time scale of structural relaxation being constant at the liquid-glass transition ($tau$ $alpha$ = 1000 s). We demonstrate that the enhanced proton transport, being a combination of intermolecular H + hopping between cation and anion as well as tautomerization process within amide moiety of ACB molecule, results in a breakdown of the Stokes-Einstein relation at ambient and elevated pressure with the fractional exponent k being pressure dependent. The dT g /dP coefficient, stretching exponent $beta$ KWW and dynamic modulus E a /$Delta$V # were found to be the same regardless of the relaxation processes studied. This is in contrast to the apparent activation volume parameter that is different when charge transport and structural dynamics are considered. These experimental results together with theoretical considerations create new ideas to design efficient proton conductors for potential electrochemical applications.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Poatynska2017,

title = {Temperature dependent FCS studies using a long working distance objective: Viscosities of supercooled liquids and particle size},

author = {Agnieszka Połatyńska and Karolina Tomczyk and Mikołaj Pochylski and Gerd Meier and Jacek Gapiński and Ewa Banachowicz and Tomasz Śliwa and Adam Patkowski},

url = {http://aip.scitation.org/doi/10.1063/1.4977047},

doi = {10.1063/1.4977047},

issn = {00219606},

year  = {2017},

date = {2017-02-01},

journal = {Journal of Chemical Physics},

volume = {146},

number = {8},

pages = {084506},

publisher = {AIP Publishing LLC},

abstract = {In this work, we describe new experimental setups for Fluorescence Correlation Spectroscopy (FCS) where a long working distance objective is used. Using these setups, FCS measurements in a broad temperature range for a small sample volume of about 50 $mu$l can be performed. The use of specially designed cells and a dry long working distance objective was essential for avoiding temperature gradients in the sample. The performance of the new setups and a traditional FCS setup with immersion objectives is compared. The FCS data in combination with the Stokes-Einstein (SE) relation were used to obtain the values of the nanoviscosity of a fluid. We show for selected molecular van der Waals supercooled liquids that despite the fact that in these systems, a characteristic length scale can be defined, the nanoviscosity obtained from FCS is in a very good agreement with the macroscopic (rheometric) viscosity of the sample in a broad temperature range. This result corroborates the applicability of the SE relation to s...},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Pochylski2016,

title = {Molecular orientation in binary liquid mixtures from excess Cotton-Mouton constant},

author = {Mikołaj Pochylski and I Iwaszkiewicz-Kostka and M S Kaczmarek and Z Woźniak and H Drozdowski},

url = {https://www.sciencedirect.com/science/article/pii/S0167732216323121 http://linkinghub.elsevier.com/retrieve/pii/S0167732216323121},

doi = {10.1016/j.molliq.2016.09.124},

issn = {01677322},

year  = {2016},

date = {2016-12-01},

journal = {Journal of Molecular Liquids},

volume = {224},

pages = {146--150},

publisher = {Elsevier},

abstract = {We show the results of magnetically induced birefringence measurements performed in binary mixtures of simple molecular liquids. New excess function was introduced based on experimentally determined values of Cotton-Mouton constant - a quantity directly related to the induced orientation of anisotropic molecules. Concentration dependencies of excess molar Cotton-Mouton constant were compared with analogous characteristics of excess molar volume. Both excess functions are well reproduced using Redlich-Kister polynomial expansion. The results suggest that in the examined mixtures binary pairs of unlike molecules are formed in which molecular planes are oriented parallel to each other with simultaneous rotation along the axis perpendicular to benzene plane. Such preferred angular arrangement is independent on the average intermolecular distance within a pair-aggregate.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Pochylski2016a,

title = {Nano-demixing as a novel strategy for magnetic field responsive systems: the case of dibutyl phosphate/bis(2-ethylhexyl)amine systems},

author = {Mikołaj Pochylski and Cesare Oliviero Rossi and Isabella Nicotera and Vincenzo Turco Liveri and Pietro Calandra},

url = {http://xlink.rsc.org/?DOI=C6RA02386J},

doi = {10.1039/C6RA02386J},

issn = {2046-2069},

year  = {2016},

date = {2016-03-01},

journal = {RSC Advances},

volume = {6},

number = {32},

pages = {26696--26708},

publisher = {The Royal Society of Chemistry},

abstract = {Pure surfactant liquids and their binary mixtures, owing to the amphiphilic nature of the molecules involved, can exhibit nano-segregation and peculiar transport properties with the formation of magnetic field-responsive supramolecular structures.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Pochylski2015,

title = {Simple way to analyze Brillouin spectra from turbid liquids.},

author = {Mikołaj Pochylski and Jacek Gapiński},

url = {http://www.ncbi.nlm.nih.gov/pubmed/25831358},

issn = {1539-4794},

year  = {2015},

date = {2015-04-01},

journal = {Optics letters},

volume = {40},

number = {7},

pages = {1456--9},

abstract = {The shape of the Brillouin light-scattering spectrum recorded from turbid liquids is distinctly distorted compared to that from a transparent sample. The reason for this is the multiple scattering of light within the medium. The usual expression for the Brillouin spectrum does not apply to the multiple scattering situation. In this Letter, we consider a Brillouin spectrum from opaque samples composed of a distribution of spectra resulting from elementary scattering events, each occurring in single scattering vector conditions. We introduce a one-parameter test function to define the probability distribution of scattering events occurring at a given value of the scattering vector. The proposed procedure was tested on model liquids that consisted of suspensions of sub-micrometer spherical particles of different size and concentration, dispersed in different carrier liquids and studied as a function of temperature. Our analysis made it possible to account for the effect of multiple scattering and to recover the values of mechanical parameters describing the pure solvents.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Aliotta2014,

title = {Is electrospray emission really due to columbic forces?},

author = {Francesco Aliotta and Pietro Calandra and Mikołaj Pochylski and Rosina C Ponterio and Gabriele Salvato and Cirino Vasi},

url = {http://aip.scitation.org/doi/10.1063/1.4894800},

doi = {10.1063/1.4894800},

issn = {2158-3226},

year  = {2014},

date = {2014-09-01},

journal = {AIP Advances},

volume = {4},

number = {9},

pages = {097105},

publisher = {American Institute of Physics},

abstract = {Electrospray ionization (ESI) is a widely adopted soft ionization method for mass spectroscopy (MS). In spite of the undeniable success of the technique, its mechanisms are difficult to be analytically modelled because the process is characterized by non-equilibrium conditions. The common belief is that the formation of gas-phase ions takes place at the apex of the Taylor cone via electrophoretic charging. The charge balance implies that a conversion of electrons to ions should occur at the metal-liquid interface of the injector needle. We have detected that the above description is based on unproved assumptions which are not consistent with the correct evaluation of the problem. The comparison between experiments performed under the usual geometry and observations obtained under symmetric field configurations suggests that the emitted droplets cannot be significantly charged or, at least, that any possible ionization mechanism is so poorly efficient to ensure that columbic forces cannot play a major role...},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Koralewski2013,

title = {Magnetic properties of ferritin and akaganeite nanoparticles in aqueous suspension},

author = {Marceli Koralewski and Mikołaj Pochylski and Jacek Gierszewski},

url = {http://link.springer.com/10.1007/s11051-013-1902-0},

doi = {10.1007/s11051-013-1902-0},

issn = {1388-0764},

year  = {2013},

date = {2013-09-01},

journal = {Journal of Nanoparticle Research},

volume = {15},

number = {9},

pages = {1902},

publisher = {Springer Netherlands},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Aliotta2013b,

title = {Enhancement of electrorheological effect by particle-fluid interaction},

author = {F Aliotta and P Calandra and Mikołaj Pochylski and R C Ponterio and G Salvato and C Vasi},

url = {https://link.aps.org/doi/10.1103/PhysRevE.87.062304},

doi = {10.1103/PhysRevE.87.062304},

issn = {1539-3755},

year  = {2013},

date = {2013-06-01},

journal = {Physical Review E},

volume = {87},

number = {6},

pages = {062304},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Aliotta2013a,

title = {Volume crossover in deeply supercooled water adiabatically freezing under isobaric conditions},

author = {Francesco Aliotta and Paolo V Giaquinta and Mikołaj Pochylski and Rosina C Ponterio and Santi Prestipino and Franz Saija and Cirino Vasi},

url = {http://aip.scitation.org/doi/10.1063/1.4803659},

doi = {10.1063/1.4803659},

issn = {0021-9606},

year  = {2013},

date = {2013-05-01},

journal = {The Journal of Chemical Physics},

volume = {138},

number = {18},

pages = {184504},

publisher = {American Institute of Physics},

abstract = {The irreversible return of a supercooled liquid to stable thermodynamic equilibrium often begins as a fast process which adiabatically drives the system to solid-liquid coexistence. Only at a later stage will solidification proceed with the expected exchange of thermal energy with the external bath. In this paper we discuss some aspects of the adiabatic freezing of metastable water at constant pressure. In particular, we investigated the thermal behavior of the isobaric gap between the molar volume of supercooled water and that of the warmer ice-water mixture which eventually forms at equilibrium. The available experimental data at ambient pressure, extrapolated into the metastable region within the scheme provided by the reference IAPWS-95 formulation, show that water ordinarily expands upon (partially) freezing under isenthalpic conditions. However, the same scheme also suggests that, for increasing undercoolings, the volume gap is gradually reduced and eventually vanishes at a temperature close to the ...},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Aliotta2013,

title = {High-frequency propagating density fluctuations in deeply supercooled water: Evidence of a single viscous relaxation},

author = {F Aliotta and Jacek Gapiński and Mikołaj Pochylski and R C Ponterio and F Saija and G Salvato and C Vasi},

url = {http://www.ncbi.nlm.nih.gov/pubmed/23496512 https://link.aps.org/doi/10.1103/PhysRevE.87.022303},

doi = {10.1103/PhysRevE.87.022303},

issn = {1539-3755},

year  = {2013},

date = {2013-02-01},

journal = {Physical Review E},

volume = {87},

number = {2},

pages = {022303},

abstract = {We performed a Brillouin scattering experiment on deeply supercooled water and compared the results with similar literature data obtained both at the same and at higher values of the exchanged wave vector. The whole set of available experimental data can be well reproduced with the use of the generalized hydrodynamic model where all the involved thermodynamic parameters are fixed to their literature values. On the contrary, the model based on the memory function approach generates the wrong estimates for measurables when the same values of the thermodynamic parameters are used. This result confirms our recent criticisms against the utilization of models originating from linear response theory [Phys. Rev. E 84, 051202 (2011)]. The inconsistency between models explains apparent discrepancies between the different conclusions on water acoustic behavior which may be found in the literature. We demonstrate that the observed behavior can be explained by assuming only a single relaxation process that is typical of any viscoelastic system. With all thermodynamics quantities fixed, the hydrodynamic description needs only two parameters to model the experimental data, namely, the relaxation time and the high-frequency limit of the sound velocity. The whole body of the experimental data can be well reproduced when the relaxation time behaves in an Arrhenian manner and the difference between the relaxed and not relaxed sound velocities is a constant. The high-frequency sound velocity is never higher than 2200 m/s. We conclude that, at least from experiments performed within the hydrodynamic regime, there is no indication for a fast sound close to the hypersonic velocity observed in ice.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Melnikowa2013,

title = {Physical characterization of iron oxide nanoparticles in magnetoferritin},

author = {L Melnikowa and Z Mitroova and M Timko and J Kovac and M Koralewski and Mikołaj Pochylski and M V Avdeev and V I Petrenko and V M Garamus and L Almasy and P Kopcansky},

url = {http://mhd.sal.lv/contents/2013/3/MG.49.3.8.R.html},

year  = {2013},

date = {2013-01-01},

journal = {Magnetohydrodynamics},

volume = {49},

number = {3/4},

pages = {293--296},

abstract = {Natural ferritin is the iron-storage protein of animals, plants, and bacteria. It is a spherical biomacromolecule of external diameter about 12 nm composed of 24 protein subunits arranged as a hollow sphere of approximately 8 nm in diameter. Inside the sphere, iron is stored in the ferric oxidation state as a complex molecule with a crystallographic structure similar to mineral ferrihydrite. By a proper chemical process, it is possible to use the empty protein shell of ferritin, i.e. apoferritin, as a confined environment, in which magnetic iron oxide nanoparticles can be synthesized forming a biocompatible ferrofluid called magnetoferritin [1]. The latest studies show that brain ferritin [2] in patients with the Alzheimer's disease [3] has a polyphase structure, incorporating also magnetite. The structure, quality and quantity of the iron core composition in the brain ferritin have not been fully determined yet, and it has not been established whether they are related to the origin of neurodegenerative diseases or to their consequences [4, 5]. For these reasons, by combining different techniques it is necessary to fully characterize the structure and the physico-chemical properties of ferritin and distinguish between magnetic structures, especially for understanding the role of magnetite presence in the development of neurodegenerative diseases. Of particular interest is the search for methods allowing detection of magnetite inside ferritin proteins in vivo and inside magnetoferritin as a model system in vitro, respectively. Magnetoferritin is a relatively new biocompatible nanomaterial with continuously increasing popularity in many fields of science from medicine through nanotechnology up to physics. If compared with physiological ferritin, magnetoferritin contains magnetic nanoparticles (Fe 3O 4, $gamma$-Fe 2O 3) surrounded by the empty protein shell (apoferritin). The problem of toxicity and side effects of magnetic nanoparticles in organs and tissues is minimized due to the protein nature of this unique material, which is important for many possible applications in clinical practice as a drug carrier, contrast medium in radiodiagnostics, or in magnetic hyperthermia therapy. In addition to biocompatibility, another advantage of magnetoferritin for biotechnological applications is a relatively short time of controlled synthesis adapted to the formation of magnetite specifically inside the protein cavity and creation the magnetoferritin molecule. Figs 3, Refs 6.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Aliotta2012,

title = {Structure of bulk water from Raman measurements of supercooled pure liquid and LiCl solutions},

author = {F Aliotta and Mikołaj Pochylski and R C Ponterio and F Saija and G Salvato and C S Vasi},

url = {https://link.aps.org/doi/10.1103/PhysRevB.86.134301},

doi = {10.1103/PhysRevB.86.134301},

issn = {1098-0121},

year  = {2012},

date = {2012-10-01},

journal = {Physical Review B},

volume = {86},

number = {13},

pages = {134301},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Koralewski2012,

title = {Magnetic Birefringence Study of the Magnetic Core Structure of Ferritin},

author = {M Koralewski and Mikołaj Pochylski and Z Mitróová and L Melníková and J Kováč and M Timko and P Kopčanský},

url = {http://przyrbwn.icm.edu.pl/APP/PDF/121/a121z5p76.pdf},

doi = {10.12693/APhysPolA.121.1237},

issn = {0587-4246},

year  = {2012},

date = {2012-05-01},

journal = {Acta Physica Polonica A},

volume = {121},

number = {5-6},

pages = {1237--1239},

abstract = {Magnetically induced optical birefringence (∆n) was measured for magnetoferritin and horse spleen ferritin aqueous suspensions. The ∆n for magnetoferritin was described in the frame of the Langevin formalism taking into account distribution of core diameter. The established average magnetic dipole moment and core diameter is equal to about 460 µB and 3 nm, respectively. It was shown that magnetic birefringence and the CottonMouton constant can be powerful parameters in identication of the magnetic core structure of ferritin, especially useful in biomedicine.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Calandra2012,

title = {Emerging dynamics in surfactant-based liquid mixtures: Octanoic acid/bis(2-ethylhexyl) amine systems},

author = {Pietro Calandra and Andrea Mandanici and Vincenzo Turco Liveri and Mikołaj Pochylski and Francesco Aliotta},

url = {http://aip.scitation.org/doi/10.1063/1.3684713},

doi = {10.1063/1.3684713},

issn = {0021-9606},

year  = {2012},

date = {2012-02-01},

journal = {The Journal of Chemical Physics},

volume = {136},

number = {6},

pages = {064515},

publisher = {American Institute of Physics},

abstract = {This work focuses on the dynamic phenomena emerging in self-assembled transient intermolecular networks formed when two different surfactants are mixed. In particular, the relaxation processes in liquid mixtures composed by bis(2-ethylhexyl)amine (BEEA) and octanoic acid (OA) in the whole composition range has been investigated by dielectric spectroscopy and Brillouin spectroscopy. A thorough analysis of all the experimental data consistently suggests that, mainly driven by acid-base interactions arising when the two surfactants are mixed, supra-molecular aggregates formation causes the slowing down of molecular dynamics. This, in turn, reflects to longer-range relaxations. These changes have been found to be composition-dependent, involving strong departures of the mixture physico-chemical properties from an ideal behaviour, and reflecting the structural and dynamical features of local structures. In particular, the peculiar dynamic processes occurring in these local inter-molecular structures, have been...},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Aliotta2011,

title = {Collective acoustic modes in liquids: A comparison between the generalized-hydrodynamics and memory-function approaches},

author = {F Aliotta and Jacek Gapiński and Mikołaj Pochylski and R C Ponterio and F Saija and C Vasi},

url = {http://www.ncbi.nlm.nih.gov/pubmed/22181402 https://link.aps.org/doi/10.1103/PhysRevE.84.051202},

doi = {10.1103/PhysRevE.84.051202},

issn = {1539-3755},

year  = {2011},

date = {2011-11-01},

journal = {Physical Review E},

volume = {84},

number = {5},

pages = {051202},

abstract = {The most familiar approaches used to describe the dynamical structure factor from adiabatic density fluctuations in liquids are based on generalized hydrodynamics and on the memory function, respectively. We show that, contrary to the common belief, the two approaches are not fully equivalent. In particular, models based on the memory function of a normalized damped oscillator fail in reproducing the correct experimental spectral profiles of systems close to the relaxation process. The discrepancy is due to misleading interpretation of the theoretical memory-function expressions, producing an unavoidable mixing of spectral contribution at different wave vectors when the theory is forced beyond its limits of validity.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Koralewski2011,

title = {Magnetic birefringence of natural and synthetic ferritin},

author = {M Koralewski and Mikołaj Pochylski and Z Mitróová and M Timko and P Kopčanský and L Melníková},

url = {https://www.sciencedirect.com/science/article/pii/S0304885311002861 http://linkinghub.elsevier.com/retrieve/pii/S0304885311002861},

doi = {10.1016/j.jmmm.2011.05.017},

issn = {03048853},

year  = {2011},

date = {2011-10-01},

journal = {Journal of Magnetism and Magnetic Materials},

volume = {323},

number = {18-19},

pages = {2413--2417},

publisher = {North-Holland},

abstract = {Magnetically induced optical birefringence ($Delta$n) was measured for magnetoferritin (MFer), horse spleen ferritin (HSF) and nanoscale magnetite aqueous suspensions. The anisotropy of optical polarizability was calculated. The average magnetic dipole moment calculated assuming the Langevin model was about 20,000 and 8500$mu$B per particle, for magnetite nanoparticle and magnetoferritin, respectively. Poor fitting results and the unphysical value of average magnetic moment per Fe ion for MFer excluded the use of the simple Langevin model for description of $Delta$n for this compound. It was deduced that for MFer the estimated average magnetic moment should be about 1125$mu$B per molecule. A magnetic contribution from the protein shell was found to be negligible. Results from the low-field region permit the calculation of the Cotton–Mouton (C–M) constants and their comparison for the substances studied. It was shown that magnetic birefringence and C–M constant can be powerful parameters in identification of the magnetic core structure of ferritins, especially useful in biomedicine.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Koralewski2011a,

title = {Magnetic birefringence of iron oxyhydroxide nanoparticles stabilised by sucrose},

author = {M Koralewski and Mikołaj Pochylski and J Gierszewski},

url = {https://www.sciencedirect.com/science/article/pii/S0304885310009194 http://linkinghub.elsevier.com/retrieve/pii/S0304885310009194},

doi = {10.1016/j.jmmm.2010.12.024},

issn = {03048853},

year  = {2011},

date = {2011-05-01},

journal = {Journal of Magnetism and Magnetic Materials},

volume = {323},

number = {9},

pages = {1140--1144},

publisher = {North-Holland},

abstract = {Magnetically induced optical birefringence is used to investigate pharmaceutically important iron–sucrose aqueous suspensions. XRD and TEM measurements of the system of oxyhydroxide particles stabilised by sucrose have shown that this system contains iron oxyhydroxide in the form of 2–5nm particles. The mineral form of the iron-core is suggested to be akaganeite. Anisotropy of the optical polarizability and magnetic susceptibility of akaganeite nanoparticles are calculated. The permanent dipole moment obtained for the nanoparticles studied was found to be negligible, in agreement with the characteristic superparamagnetic behaviour of the magnetic nanoparticles observed at room temperature. The Neel temperature of these nanoparticles is estimated as below 276K. The results obtained are discussed against a background of the earlier studies of similar nanoscale systems.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Aliotta2011b,

title = {Relaxation dynamics and evidence of scaling behaviours in aqueous polymer solutions},

author = {F Aliotta and R C Ponterio and F Saija and J Gapiński and Mikołaj Pochylski},

url = {http://www.events.sbg.ac.at/emlg2009/EMLG2009 Abstracts/PL_Aliotta_abstract2.pdf http://linkinghub.elsevier.com/retrieve/pii/S0167732210003545},

doi = {10.1016/j.molliq.2010.12.006},

issn = {01677322},

year  = {2011},

date = {2011-02-01},

journal = {Journal of Molecular Liquids},

volume = {159},

number = {1},

pages = {105--111},

abstract = {The results from some recent Brillouin scattering experiments on aqueous solution of Polyethylene glycol and Polyethylene glycol dimethyl ether are presented. In all the systems a non-Debye relaxation processes have been detected, proceeding on the ps time scale. The average values of the detected relaxation time distributions fail to follow simple Arrhenius behaviors. The temperature evolution of the relaxation time is adequately fitted after the adoption of a phenomenological Vogel-Fulcher-Tammon model. In spite of the different temperature and concentration dependences observed for each system, a unique scaling behavior has been evidenced, at relatively low water contents, when the real and imaginary parts of the loss modulus are plotted as a function of a reduced reverse temperature, T 0 /T, being T 0 the values of the arrest temperature as obtained by the Vogel-Fulcher-Tammon fits. The observation of a unique scaling law for aqueous solutions of polymers characterized by the same average molecular weight but with different end groups suggests for the establishment of similar hydrogen bonded local structures where water plays a main role, acting as a stabilizer bridging neighbouring polymer chains. The possible physical meanings of the obtained phenomenological fitting parameters are discussed and the results are compared with other literature findings. Some excess thermodynamic quantities are analyzed and discussed in the frame of recent approaches. REFERENCES},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Pochylski2010a,

title = {Brillouin Scattering Study of Polyethylene Glycol/Water System below Crystallization Temperature},

author = {Mikołaj Pochylski and Jacek Gapiński},

url = {http://www.ncbi.nlm.nih.gov/pubmed/20146525 http://pubs.acs.org/doi/abs/10.1021/jp910783j},

doi = {10.1021/jp910783j},

issn = {1520-6106},

year  = {2010},

date = {2010-03-01},

journal = {The Journal of Physical Chemistry B},

volume = {114},

number = {8},

pages = {2644--2649},

abstract = {We present the results of a Brillouin scattering experiment on aqueous mixtures of polyethylene glycol polymer cooled below their crystallization temperature. The shape of the registered spectrum changed considerably when the phase transition occurs. The Brillouin profile consisted of two peaks which has been interpreted as a result of the scattering of light on the local regions exhibiting different compressibility. Examination of the temperature dependence of the two Brillouin peak positions allows the identification of the specific microstructures present in the studied system. The existence of a complexlike hydration structure, stable against dilution and temperature agitation, was suggested. The nature and the behavior of the hydration complex is discussed in view of the earlier investigations in similar systems.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Pochylski2010b,

title = {Some Evidence of Scaling Behavior in the Relaxation Dynamics of Aqueous Polymer Solutions},

author = {Mikołaj Pochylski and F Aliotta and R C Ponterio and F Saija and Jacek Gapiński},

url = {http://www.ncbi.nlm.nih.gov/pubmed/20055360 http://pubs.acs.org/doi/abs/10.1021/jp9052456},

doi = {10.1021/jp9052456},

issn = {1520-6106},

year  = {2010},

date = {2010-02-01},

journal = {The Journal of Physical Chemistry B},

volume = {114},

number = {4},

pages = {1614--1620},

abstract = {The structural relaxation behavior of aqueous solution of poly(ethylene glycol) and methoxy-capped poly(ethylene glycol), both of mean molecular mass 400 g/mol, is investigated by Brillouin scattering experiments. In both cases non-Debye relaxation processes have been detected, proceeding on the picosecond time scale. The average values of the detected relaxation time distributions fail to follow the simple Arrhenius behavior. The temperature evolution of the relaxation time is adequately fitted using the phenomenological Vogel-Fulcher-Tamman (VFT) model. In spite of the different temperature and concentration dependences observed for the two kinds of systems, with the exception of the highest samples concentrations, a unique scaling behavior has been found for the real and imaginary parts of the loss modulus plotted as a function of the reduced inverse temperature, T(0)/T, T(0) being the VFT arrest temperature. The presence of a unique scaling law in aqueous solutions of polymers characterized by different end groups suggests the establishment of similar hydrogen-bonded local structures. Within this scenario, water acts as a stabilizer and plays the main role bridging neighboring polymer chains. The possible physical interpretation of the obtained fit parameters is discussed, and the results are compared with other literature findings.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Ponterio2010,

title = {Raman scattering measurements on a floating water bridge},

author = {R C Ponterio and Mikołaj Pochylski and F Aliotta and C Vasi and M E Fontanella and F Saija},

url = {http://stacks.iop.org/0022-3727/43/i=17/a=175405},

doi = {10.1088/0022-3727/43/17/175405},

year  = {2010},

date = {2010-01-01},

journal = {Journal of Physics D: Applied Physics},

volume = {43},

number = {17},

pages = {175405},

abstract = {It was observed that when polarized by an intense electric field, water is able to self-arrange into macroscopic cylindrical wires that can hang up and remain floating against gravity. This phenomenon is now known as a 'water bridge'. Several attempts have been made to give an explanation of this apparently unusual behaviour of water. A number of experiments have been performed with the aim of probing any possible structural change of bulk water, after application of the electric field. None of the available findings appear conclusive at the moment. Here we report the results of the first Raman scattering experiment on floating water bridges. The inter-molecular OH-stretching band has been investigated and the results have been compared with those from bulk water. Some changes in the scattering profiles after application of the electric field are shown to have a structural origin. The bridges have been obtained, for the first time, in a vertical geometry and under application of an alternating field. The adopted geometry has allowed us to reveal a clear asymmetry between opposite direct current biasing, which can be related to the nature of the charge carriers.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Saija2010,

title = {Communication: An extended model of liquid bridging},

author = {F Saija and F Aliotta and M E Fontanella and Mikołaj Pochylski and G Salvato and C Vasi and R C Ponterio},

url = {https://doi.org/10.1063/1.3483690},

doi = {10.1063/1.3483690},

year  = {2010},

date = {2010-01-01},

journal = {The Journal of Chemical Physics},

volume = {133},

number = {8},

pages = {081104},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Kaczmarek2008b,

title = {Dynamics of transportation of glucose and urea water solutions through a porous polyethyleneterephthalate membrane studied by optical interference},

author = {Michał S Kaczmarek and Piotr Ładziński and Zenon Woźniak and Zdzisław Błaszczak and Marian Surma and Mikołaj Pochylski},

url = {http://www.sciencedirect.com/science/article/pii/S0167732207001948},

doi = {10.1016/j.molliq.2007.10.002},

issn = {0167-7322},

year  = {2008},

date = {2008-01-01},

journal = {Journal of Molecular Liquids},

volume = {138},

number = {1},

pages = {168 - 172},

abstract = {The paper reports an interferometric method for characterisation of the dynamics of transportation of glucose and urea water solutions through a porous polyethyleneterephthalate membrane. The method is based on measurements of the changes in the light refraction indices of solutions partitioned by the membrane, using a Jamina interferometer. Synthetic membranes have been used among others in haemodialysis. In this process selective transportation of substances through a membrane permits elimination of toxic substances form the patient's blood employing the phenomena of osmosis, filtration, ultrafiltration and diffusion. The process efficiency depends on the parameters of the membrane pores (diameter, channel length, number of channels per diffusion active area). The process of haemodialysis can be optimised by changing the parameters influencing its course, whose effect is determined by measurements of diffusion rate of substances of the known molar weight, molecule size and permeability (glucose, urea) in laboratory conditions. In this paper, assuming the porous model of the membrane structure, the permeability P and mean number of pores m per a unit of the diffusion active area have been determined in order to establish the parameters at which the course of haemodialysis will be the most effective.},

keywords = {Biological membranes, Dialysis therapy, Optical interference},

pubstate = {published},

tppubtype = {article}

}

@article{Kasprzak2008,

title = {Kerr effect in liquids with various electro-optic properties},

author = {W Kasprzak and Z Nadolny and M.S Kaczmarek and Z. Woźniak and Mikołaj Pochylski},

year  = {2008},

date = {2008-01-01},

journal = {Przegląd Elektrotechniczny},

volume = {84},

number = {10},

pages = {166-169},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Aliotta2007,

title = {Excess compressibility in binary liquid mixtures},

author = {F Aliotta and Jacek Gapiński and Mikołaj Pochylski and R C Ponterio and F Saija and G Salvato},

url = {http://www.ncbi.nlm.nih.gov/pubmed/17581064 http://aip.scitation.org/doi/10.1063/1.2745292},

doi = {10.1063/1.2745292},

issn = {0021-9606},

year  = {2007},

date = {2007-06-01},

journal = {The Journal of Chemical Physics},

volume = {126},

number = {22},

pages = {224508},

abstract = {Brillouin scattering experiments have been carried out on some mixtures of molecular liquids. From the measurement of the hypersonic velocities we have evaluated the adiabatic compressibility as a function of the volume fraction. We show how the quadratic form of the excess compressibility dependence on the solute volume fraction can be derived by simple statistical effects and does not imply any interaction among the components of the system other than excluded volume effects. This idea is supported by the comparison of the experimental results with a well-established prototype model, consisting of a binary mixture of hard spheres with a nonadditive interaction potential. This naive model turns out to be able to produce a very wide spectrum of structural and thermodynamic features depending on values of its parameters. An attempt has made to understand what kind of structural information can be gained through the analysis of the volume fraction dependence of the compressibility.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{MASY:MASY200750507,

title = {High-Frequency Dynamical Behavior of Poly(ethylene glycol)+H2O Mixtures by Brillouin Spectroscopy},

author = {Mikołaj Pochylski and F Aliotta and Z Błaszczak and J Gapiński},

url = {http://dx.doi.org/10.1002/masy.200750507},

doi = {10.1002/masy.200750507},

issn = {1521-3900},

year  = {2007},

date = {2007-01-01},

journal = {Macromolecular Symposia},

volume = {251},

number = {1},

pages = {47-53},

publisher = {WILEY-VCH Verlag},

abstract = {Brillouin spectroscopy has been used to examine high-frequency dynamical behavior of aqueous solutions of poly(ethylene glycol) (Mw ≈ 400g/mol) at 298K in the entire concentration region. It was found that a relaxation process takes place in the experimental frequency window that significantly affects the shape of experimentally recorded spectrum of the density fluctuations (dynamical structure factor). The process detected was attributed to segmental motion of the flexible polymeric chain. The full spectrum analysis of Brillouin spectra has been performed taking advantage of the relaxation function previously used in describing a single relaxation process in dielectric examination of water solutions of PEG 400. The proposed data processing procedure permits a qualitative reproduction of concentration dependencies of the hypersonic wave velocity and absorption measured. The shapes of the concentration dependencies of the relaxation times obtained from the Brillouin and the dielectric spectroscopies are in good agreement over a very broad concentration range, although their absolute values are scaled by the factor of 3. This result indicate that the two processes revealed independently by dielectric and Brillouin spectroscopies, apparently separated in time-scale, are just the same relaxation process.},

keywords = {Brillouin scattering, mechanical properties, Polyethylene glycol, relaxation},

pubstate = {published},

tppubtype = {article}

}

@article{Pochylski2007,

title = {Brillouin spectroscopy investigations of poly(ethylene glycol) water and organic solvent mixtures},

author = {Mikołaj Pochylski and Zdzislaw Blaszczak},

doi = {10.1117/12.726588},

year  = {2007},

date = {2007-01-01},

journal = {Proc. SPIE},

volume = {6598},

pages = {65980X},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Pochylski2006a,

title = {Structuring Effects and Hydration Phenomena in Poly(Ethylene Glycol)/Water Mixtures Investigated by Brillouin Scattering},

author = {Mikołaj Pochylski and F Aliotta and Z Blaszczak and Jacek Gapiński},

url = {http://www.ncbi.nlm.nih.gov/pubmed/17034240 http://pubs.acs.org/doi/abs/10.1021/jp0620973},

doi = {10.1021/jp0620973},

issn = {1520-6106},

year  = {2006},

date = {2006-10-01},

journal = {The Journal of Physical Chemistry B},

volume = {110},

number = {41},

pages = {20533--20539},

abstract = {Aqueous solutions of poly(ethylene glycol) (PEG) of mean molecular mass of 600 g/mol (PEG600) are investigated by Brillouin scattering technique. At high PEG content, a relaxation phenomenon is observed, which is related to a local rearrangement of the polymer structure where the interaction, via hydrogen bonding, with the solvent molecules plays a role. The obtained values of the relaxation times match the literature data very well for a fast relaxation time revealed by dielectric relaxation measurements in very similar mixtures. The calculated concentration behaviors of the excess adiabatic compressibility turns out in good agreement with the previous findings from ultrasonic measurements at 3 MHz. The observed minimum in the adiabatic compressibility is interpreted as the result of the interaction between water and the EO units of the PEG chain, which results in a structure tighter then that typical of bulk water and of pure PEG600. Such a hypothesis is supported by the observation that volume fraction value of about 0.3 coincides with the concentration value at which full hydration of EO units takes place. The observation that at the same concentration, the polymer coils start to overlap each other further supports the idea that the adiabatic compressibility behavior is monitoring the structural evolution of the mixture. However, similar results are obtained for largely different binary mixture which suggests caution in taking this conclusion too literally. In particular, the hypothesis that the occurrence of an extreme in the excess adiabatic compressibility could be simply originated by statistical effects and that further work is required for disentangling entropic contribution from effects of hetero-association and self-aggregation of one or both the components.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Pochylski2006b,

title = {Evidences of Nonideal Mixing in Poly(ethylene Glycol)/Organic Solvent Mixtures by Brillouin Scattering},

author = {Mikołaj Pochylski and F Aliotta and Z Błaszczak and Jacek Gapiński},

url = {http://www.ncbi.nlm.nih.gov/pubmed/16471559 http://pubs.acs.org/doi/abs/10.1021/jp053813o},

doi = {10.1021/jp053813o},

issn = {1520-6106},

year  = {2006},

date = {2006-01-01},

journal = {The Journal of Physical Chemistry B},

volume = {110},

number = {1},

pages = {485--493},

abstract = {The concentration dependence of the hypersonic properties of solutions of poly(ethylene glycol) of mean molecular mass 600 g/mol (PEG600) in benzene and toluene has been investigated by Brillouin scattering. The two solvents are very similar in structure and chemical properties, but while benzene is nonpolar, toluene possess a modest dipole. In both solvents a high-frequency relaxation process has been observed at high concentrations which has been assigned to conformational rearrangements of the polymeric chains, triggered by reorientation of the side groups. In both cases, the concentration dependence of the adiabatic compressibility deviates significantly from linearity, indicating the existence of nonideal mixing phenomena driven by aggregation processes taking place in the systems. However, there is no temperature dependence for solutions of PEG600 in benzene; on the contrary, the results obtained for solutions of PEG600 in toluene are noticeably dependent on the temperature. The comparison of the experimental data with the results of previous experiments on similar systems allows a general picture for weakly interacting mixtures of hydrogen-bonded systems and organic solvents to be developed. In particular, in the presence of a nonpolar solvent molecule the local structure of the mixture is dominated by solute self-association processes and any resulting solute-solvent correlation is barely induced by excluded volume effects. At high enough dilution the self-aggregation of solute molecules produces a variety of new local topologies that cannot be observed in bulk solute, and as a consequence, the concentration evolution of the system is too rich to be described in terms of a linear combination of a few components over the whole concentration range. The situation seems to be simpler for the polar toluene solvent molecules, where a three-component model seems able to fit the experimental concentration dependence of the hypersonic velocity. This result is interpreted to imply that the interaction between the solvent dipoles and the active sites of the solute produces a relatively stable heterocoordination, while the relevance of self-association is partially reduced.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Pochylski2005,

title = {Structural Relaxation Processes in Polyethylene Glycol/CCl 4 Solutions by Brillouin Scattering},

author = {Mikołaj Pochylski and F Aliotta and Z Błaszczak and Jacek Gapiński},

url = {http://www.ncbi.nlm.nih.gov/pubmed/16851480 http://pubs.acs.org/doi/abs/10.1021/jp045130z},

doi = {10.1021/jp045130z},

issn = {1520-6106},

year  = {2005},

date = {2005-03-01},

journal = {The Journal of Physical Chemistry B},

volume = {109},

number = {9},

pages = {4181--4188},

abstract = {We present results of a Brillouin scattering experiment on solutions of poly(ethylene glycol) of mean molecular mass 600 g/mol (PEG600) in CCl4. The relaxation process detected has been assigned to conformational rearrangements of the polymeric chains, triggered by reorientation of the side groups. The concentration dependencies of the hypersound velocity and normalized absorption are compared against the indications from several models proposed in the literature. The concentration evolution of the system is described in terms of two distinct regimes. At high polymer content, the system is dominated by the structure of the dense polymer, where polymer-polymer interactions, together with excluded volume effects, induce the existence of a preferred local arrangement resulting in a narrow distribution of the relaxation times, with the average value of the relaxation time following a simple Arrhenius temperature dependence. As the concentration decreases, the original structure of the hydrogen bonded polymer network is destroyed, and a number of different local configuration coexist, giving rise to a wider distribution of relaxation times or to a multiple relaxation. At low concentrations, the experimental data are well fitted assuming a Vogel-Fulker-Tammon behavior for the average relaxation time. In addition, the observed deviation from the ideal behavior for the refractive index and the density suggests that CCl4 does not behave as an inert solvent, and due to polarization effects, it can develop local hetero-associated structures via electrostatic interaction with the O-H end groups of the polymeric chains. The hypothesis has been successfully tested by fitting the concentration behavior of the hypersonic velocity to a recent three-component model, suitable to describe the concentration dependence of sound velocity in moderately interacting fluids. The indication of the model furnishes a very high value for the association constant of the PEG600, confirming the literature indication that, in polymeric systems capable of developing long liner aggregates via hydrogen bonding interaction, the Brillouin probe is insensitive to the true length of the polymeric chains. The Brillouin scattering experiment just sees an effective hydrogen bonded aggregate that is huge relative to the length of the single polymeric chain and becomes sensitive only to the density fluctuations of the local segmental motions.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Błaszczak2005,

title = {Temperature study of Brillouin light scattering in selected dimethacrylates},

author = {Zdzisław Błaszczak and Mikołaj Pochylski and Iwona Iwaszkiewicz-Kostka and Piotr Ziobrowski and Mirosław Drozdowski},

url = {http://www.sciencedirect.com/science/article/pii/S0022286004007239},

doi = {j.molstruc.2004.09.030},

issn = {0022-2860},

year  = {2005},

date = {2005-01-01},

journal = {Journal of Molecular Structure},

volume = {737},

number = {1},

pages = {11 - 15},

abstract = {Selected dimethacrylates forming multifunctional monomers have been studied using Brillouin spectroscopy. The hypersound wave propagation velocity and adiabatic compressibility of the compounds studied have been determined. It has been revealed that these quantities depend on both temperature and the structure of the molecule chain of the monomer. Some characteristic features obtained from the Brillouin study have been discussed in terms of molecular interactions.},

keywords = {Brillouin scattering, Dimethacrylates, Hydrogen-bond liquid},

pubstate = {published},

tppubtype = {article}

}

@article{doi:10.1080/00319100412331333904,

title = {X-Ray method of detection of neoplasmic changes},

author = {A Mikusińska-Planner and J Gągalska and Mikołaj Pochylski and M M Kaczmarek},

url = {https://doi.org/10.1080/00319100412331333904},

doi = {10.1080/00319100412331333904},

year  = {2005},

date = {2005-01-01},

journal = {Physics and Chemistry of Liquids},

volume = {43},

number = {2},

pages = {167-174},

publisher = {Taylor & Francis},

abstract = {The article presents an X-ray method of detection of neoplasmic changes in people based on measurements from human blood serum. A new X-ray marker Ωrtg is defined and determined directly from the experimental angular distributions of radiation scattered by human blood serum samples. The numerical values of the marker Ωrtg are related directly to the character of the angular distribution of the scattered radiation intensity. The values of Ωrtg markers obtained for cancer patients were compared with the levels of the PSA marker. Statistical computer analysis of the correlation between the markers Ωrtg and PSA was made with the use of Statistica software by the method of classification trees. The threshold value of the Ωrtg marker, allowing distinction between the healthy and neoplasmically changed blood serum, was determined.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Błaszczak2005b,

title = {Brillouin scattering study of polyethylene glycol different solutions},

author = {Zdzisław Błaszczak and Mikołaj Pochylski and Iwona Iwaszkiewicz-Kostka and Piotr Ziobrowski and Mirosław Drozdowski and Maher Farhoud},

url = {http://www.sciencedirect.com/science/article/pii/S016773220400340X},

doi = {j.molliq.2004.10.034},

issn = {0167-7322},

year  = {2005},

date = {2005-01-01},

journal = {Journal of Molecular Liquids},

volume = {121},

number = {2},

pages = {75 - 79},

abstract = {Abstract Brillouin spectroscopy was used to study the elastic properties of polyethylene glycol solutions in water, benzene and toluene. It has been shown that the spectroscopic features, characterizing the elastic properties of polymer solutions being under study, strongly depend on both polymer concentration and the kind of solvent. The non-monotonic character of the concentration dependencies of the hypersound velocity and adiabatic compressibility indicate the occurrence of the polymer–solvent interactions.},

keywords = {Brillouin scattering, PEG, Polyethylene glycol, Solutions},

pubstate = {published},

tppubtype = {article}

}

@article{Iwaszkiewicz-Kostka2003,

title = {Investigation of the local structure of selected dimethacrylates by Brillouin light scattering},

author = {Iwona Iwaszkiewicz-Kostka and Zdzislaw Blaszczak and Mikołaj Pochylski and P. Ziobrowski and Miroslaw Drozdowski},

url = {http://dx.doi.org/10.1117/12.520586},

doi = {10.1117/12.520586},

year  = {2003},

date = {2003-01-01},

journal = {Proc.SPIE},

volume = {5229},

number = {38},

pages = {5229},

abstract = {Temperature dependence of Brillouin light scattering in selected dimethacrylates has been studied. For the compounds studied, being multifunctional monomers, the values of hypersound speed have been determined. It has been established that with increasing temperature the hypersound speed decreases for all substances studied.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}