mgr Agnieszka Połatyńska
2017
Wojnarowska, Z; Rams-Baron, M; Knapik-Kowalczuk, J; Połatyńska, Agnieszka; Pochylski, Mikołaj; Gapiński, Jacek; Patkowski, Adam; Wlodarczyk, P; Paluch, M
Experimental evidence of high pressure decoupling between charge transport and structural dynamics in a protic ionic glass-former Journal Article
In: Scientific Reports, vol. 7, no. 1, pp. 7084, 2017, ISSN: 2045-2322.
Abstract | Links | BibTeX | Tagi:
@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}
}
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.
Połatyńska, Agnieszka; Tomczyk, Karolina; Pochylski, Mikołaj; Meier, Gerd; Gapiński, Jacek; Banachowicz, Ewa; Śliwa, Tomasz; Patkowski, Adam
Temperature dependent FCS studies using a long working distance objective: Viscosities of supercooled liquids and particle size Journal Article
In: Journal of Chemical Physics, vol. 146, no. 8, pp. 084506, 2017, ISSN: 00219606.
Abstract | Links | BibTeX | Tagi:
@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}
}
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...