Urszula Narkiewicz

West Pomeranian University of Technology

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Daniel Sibera

West Pomeranian University of Technology

Iwona Pełech

West Pomeranian University of Technology

W. Arabczyk

West Pomeranian University of Technology

Antoni W. Morawski

West Pomeranian University of Technology

J. Typek

West Pomeranian University of Technology

Ewelina Kusiak‐Nejman

West Pomeranian University of Technology

Piotr Staciwa

West Pomeranian University of Technology

GŻ

G. Żołnierkiewicz

West Pomeranian University of Technology

Rafał J. Wróbel

West Pomeranian University of Technology

Dariusz Moszyński

West Pomeranian University of Technology

Cooperative Institutions

West Pomeranian University of Technology

University of Szczecin

Polish Academy of Sciences

Institute of Physics

Czech Academy of Sciences, Institute of Physics

Zachodniopomorskie Centrum Onkologii

Warsaw University of Technology

Institute of High Pressure Physics

University of Warsaw

Centre National de la Recherche Scientifique

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Removal of SO₂ from gases on carbon materials

Polish Journal of Chemical Technology (2012)

Urszula Narkiewicz Anna Pietrasz Iwona Pełech W. Arabczyk

Removal of SO 2 from gases on carbon materials The aim of the work is to describe a capability of the active carbon CARBON L-2-4 (AC) and of the nanocarbon (NC) materials containing iron nanoparticles to continuously remove SO 2 from air. The carbon nanomaterials (NC) containing iron nanoparticles were synthesised using a chemical vapor deposition method - through catalytic decomposition of ethylene on nanocrystalline iron. The process of SO 2 removal was carried out on dry and wet with water carbon catalyst (AC or NC) and was studied for inlet SO 2 concentration 0.3 vol.% in the presence of O 2 , N 2 and H 2 O, in the temperature range of 40-80°C.

Carbon fibers

Nanocrystalline material

Nanomaterials

10.2478/v10026-012-0057-6

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Citations (3)

Transition metals in ZnO nanocrystals: Magnetic and structural properties

Science of Sintering (2013)

I. Kuryliszyn‐Kudelska W. Dobrowolski Μ. Arciszewska N. Romčević M. Romčević

Currently, wide-gap ZnO nanoparticles bear important potential application in electro-optical devices, transparent ultraviolet protection films, and spintronic devices. We have studied the magnetic properties of nanocrystals of ZnO(Fe, Co, Mn) prepared by two methods of synthesis. We have used the microwave assisted hydrothermal synthesis and traditional wet chemistry method followed by calcination. The detailed structural characterization was performed by means of X-ray diffraction and micro-Raman spectroscopy measurements. The morphology of the samples was studied by means of SEM and TEM microscopy. The results of systematic measurements of AC magnetic susceptibility as a function of temperature and frequency as well as SQUID magnetization are presented. The SQUID magnetization measurements revealed a clear bifurcation of the FC and ZFC plots. Such behavior suggested superparamagnetic behavior above the blocking temperature. The dynamic magnetic measurements were performed at small AC magnetic field with amplitude not exceeding 5 Oe and different frequency values (from 7 Hz to 9970 Hz). For ZnO(Fe) and ZnO(Mn), the AC susceptibility maxima has been found for in-phase susceptibility Re(?) and for out of phase susceptibility Im(?). We analyzed the observed frequency dependence of the peak temperature in the AC susceptibility curve using the empirical parameter ? that is a quantitative measure of the frequency shift and is given by the relative shift of the peak temperature per decade shift in frequency, as well as Vogel- Fulcher law. We observed two different types of magnetic behavior, spin-glasslike behavior or superparamagnetic behavior, depending on the synthesis process. For ZnO(Co) nanocrystalline samples high temperature Curie-Weiss behavior in AC magnetic susceptibility was observed. We observed that the determined negative values of the Curie- Weiss temperature ? depend strongly on the nominal content of cobalt oxide. It was shown that for calcination method the values of ? increase with the increase of magnetic ion content indicating enhancement of predominance of antiferromagnetic interactions. For hydrothermal method the opposite effect was observed indicating the breakdown of predominance of aniferromagnetic coupling with the increase of nominal magnetic ion content. This paper gives an in-depth discussion of the structural and magnetic properties of ZnO nanocrystals in addition to the technological issues such as different methods of wet chemical synthesis.

Superparamagnetism

10.2298/sos1301031k

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Citations (15)

Adsorptive removal of cationic dye from aqueous solutions by ZnO/ZnMn₂O₄nanocomposite

Separation Science and Technology (2018)

Wojciech Konicki Daniel Sibera Urszula Narkiewicz

The ZnO/ZnMn2O4 nanocomposite (ZnMn) was used as adsorbent for the removal of cationic dye Basic Yellow 28 (BY28) from aqueous solutions. The adsorbent was characterized by X-ray diffraction, scanning electron microscope, TEM, Fourier transform infrared ray, BET, particle size distribution and zeta potential measurements. The adsorption parameters, such as temperature, pH and initial dye concentration, were studied. Kinetic adsorption data were analyzed using the pseudo-first-order, pseudo-second-order and intraparticle diffusion kinetic models. The Langmuir and Freundlich isotherm models were applied to fit the equilibrium data. The maximum adsorption capacity of BY28 was 48.8 mg g−1. Various thermodynamic parameters, such as ΔG°, ΔH° and ΔS°, were calculated.

Cationic polymerization

Zeta potential

10.1080/01496395.2018.1444054

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Citations (16)

Removal of metal particles from carbon nanotubes using conventional and microwave methods

Separation and Purification Technology (2014)

Iwona Pełech Urszula Narkiewicz Agnieszka Kaczmarek Anna Jędrzejewska Robert Pełech

Carbon fibers

Microwave digestion

10.1016/j.seppur.2014.08.036

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Citations (14)

AGEING EFFECT IN CARBON-COATED COBALT NANOPARTICLES EMBEDDED IN A CEMENT MATRIX STUDIED BY FMR

N. Guskos Marcin Soboń Aleksander Guskos J. Typek I. E. Lipiński

Samples containing agglomerated cobalt magnetic nanoparticles coated with carbon and dispersed in a cement matrix have been prepared. The samples with (25/75 wt.%) carbon/ cobalt content dispersed at low concentration in cement (about 0.5%) have been studied using the ferromagnetic resonance (FMR) method at room temperature (RT). Very intense and broad FMR lines have been recorded in the fresh samples, more intense than those obtained from the same agglomerates dispersed in a paraffin matrix. The FMR spectrum of the cement matrix sample consisted of three different magnetic resonance components: (a) a very broad FMR line attributed to iron oxide, (b) an EPR line arising from trivalent iron ions in a crystal field of low symmetry, and (c) a line from divalent manganese ions. After two months the FMR spectra of cobalt nanoparticles dispersed in cement has changed drastically, while the same agglomerates dispersed in paraffin has shown only weak time dependence. Magnetic interaction between magnetic nanofillers could be more intense in the case of a cement matrix for two reasons: one is due to the porous state of this material and the other is owing to the chemical and physical reactions of agglomerates with various cement constituents. Applications of the obtained results could lead to the production of cement with much better mechanical properties.

Agglomerate

Matrix (chemical analysis)

Carbon fibers

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Citations (3)

Technology of the nanocarbon materials preparation

Polish Journal of Chemical Technology (2005)

Urszula Narkiewicz

Industrial chemistry

Materials processing

Source

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Citations (1)

Superparamagnetic and ferrimagnetic behavior of nanocrystalline ZnO(MnO)

Physica E Low-dimensional Systems and Nanostructures (2017)

I. Kuryliszyn‐Kudelska W. Dobrowolski Μ. Arciszewska N. Romčević M. Romčević

Ferrimagnetism

Superparamagnetism

Nanocrystalline material

Characterization

10.1016/j.physe.2017.12.008

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Citations (6)

Simultaneous purification and functionalization of carbon nanotubes using chlorination

Journal of materials research/Pratt's guide to venture capital sources (2012)

Iwona Pełech Urszula Narkiewicz Dariusz Moszyński Robert Pełech

Surface Modification

Carbon fibers

10.1557/jmr.2012.243

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Citations (31)

Nucleation in a gas‐solid state reaction

Crystal Research and Technology (2012)

Rafał J. Wróbel W. Arabczyk Urszula Narkiewicz

Abstract A nucleation in a reaction of a gas with a solid state where one of the products is solid (GSR‐S) has been discussed. It was pointed out that the phenomenon observed for nanopowders, i.e. nucleation in sequence of the crystallites sizes, should be valid in case of defected monocrystals. However in such a case the constituents of a monocrystal, i.e. mosaic domains separated by structural defects, should undergo phase transition in sequence of size or, in other words, the time needed for the initiation of a nucleus in the case of a small domain is shorter than in the case of big one. Finally the less defected the crystal is, the bigger domains are, and thus the longer nucleation time is needed.

Sequence (biology)

Crystal (programming language)

10.1002/crat.201200176

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Citations (1)

Laser power influence on Raman spectra of ZnO(Co) nanoparticles

Journal of Physics and Chemistry of Solids (2015)

B. Hadžić N. Romčević Daniel Sibera Urszula Narkiewicz I. Kuryliszyn‐Kudelska

Nanocrystalline material

Power density

10.1016/j.jpcs.2015.12.008

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Citations (19)