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Andrzej Sienkiewicz

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Publications associées (74)

Synthesis, electrical resistivity, thermo-electric power and magnetization of cubic ZnMnO3

László Forró, Andrzej Sienkiewicz, Richard Gaal, Arnaud Magrez, Zlatko Mickovic, Jacim Jacimovic, Rita Smajda, George Cristian Vaju

Cubic ZnMnO3 powder in the form of well-crystalline nanoflakes have been synthesized at low temperatures from a nitrate precursor. The electrical properties of cubic ZuMnO(3) samples have been established by DC resistivity (rho) and thermo-electric power ( ...

Elsevier2011

Toward Understanding the Chloroquine Action at the Molecular Level in Antimalarial Therapy - X-ray Absorption Studies in Acetic Add Solution

Andrzej Sienkiewicz

The local atomic structure around the central iron of the synthetic soluble analog of malarial pigment in acetic acid solution and with addition of chloroquine as found by X-ray absorption spectroscopy is reported. The special interest was drawn to the axi ...

2011

Fractional Spin-Labeling of Polymers for Enhancing NMR Sensitivity by Solvent-Free Dynamic Nuclear Polarization

Andrzej Sienkiewicz, Geoffrey Bodenhausen, Sandrine Gerber, Sami Jannin, Françoise Borcard, Pascal Miéville, Marc Anthony Caporini

Wiley-Blackwell2011

Understanding Chloroquine Action at the Molecular Level in Antimalarial Therapy: X-ray Absorption Studies in Dimethyl Sulfoxide Solution

Andrzej Sienkiewicz

X-ray absorption spectroscopy is used to determine the local atomic structure around the iron atom from a soluble synthetic analogue of malaria pigment (hemozoin), cf. ferrimesoporphyrin IX of mesohematin anhydride, in the absence or presence of chloroquin ...

2011

Inactivation of MS2 coliphage in Fenton and Fenton-like systems: role of transition metals, hydrogen peroxide and sunlight

Andrzej Sienkiewicz, Tamar Kohn, Jessica Ivana Nieto Juarez

The inactivation of coliphage MS2 by iron- and copper-catalyzed Fenton systems was studied to assess the importance of this process for virus inactivation in natural systems and during water treatment by advanced oxidation processes. The influence of H2O2 ...

American Chemical Society2010

Synthesis, Characterization, and Photocatalytic Activities of Nanoparticulate N, S-Codoped TiO2 Having Different Surface-to-Volume Ratios

László Forró, Juan Kiwi, Jacques-Edouard Moser, César Pulgarin, Andrzej Sienkiewicz, Julian Andrés Rengifo Herrera, Katarzyna Pierzchala

An efficient, visible light active, N, S-codoped TiO2-based photocatalyst was prepared by reacting thiourea with nanoparticulate anatase TiO2. Commercial anatase powders were manually ground with thiourea and annealed at 400 degrees C in two crucibles with ...

American Chemical Society2010

Evidence of lipid peroxidation and protein phosphorylation in cells upon oxidative stress photo-generated by fullerols

László Forró, Andrzej Sienkiewicz, Sylvia Jeney

An oxidative stress (OS) state is characterized by the generation of Reactive Oxygen Species (ROS) in a biological system above its capacity to counterbalance them [1]. Exposure to OS induces the accumulation of intracellular ROS, which in turn causes cell ...

Elsevier2010

Synthesis of Nanosized Mn-Doped ZnO by Low Temperature Decomposition of Hydrozincite Precursors

László Forró, Andrzej Sienkiewicz, Arnaud Magrez, Zlatko Mickovic, Marijana Mionic Ebersold, Duncan Thomas Lindsay Alexander

Transition-metal-doped ZnO is considered a promising candidate for applications in spintronics. Here, we developed it novel and versatile synthetic route for obtaining impurity-free Mn-doped zinc oxide (Zn1-xMnxO) materials witha well-controlled content of ...

2010

Atom-Transfer Radical Addition Reactions Catalyzed by RuCp* Complexes: A Mechanistic Study

Andrzej Sienkiewicz, Kay Severin, Katrin Anne Thommes, Katarzyna Pierzchala, Gregor Kiefer

Kinetic and spectroscopic analyses were performed to gain information about the mechanism of atom-transfer radical reactions catalyzed by the complexes [RuCl2Cp*(PPh3)] and [RuClCp*(PPh3)2] (Cp*=pentamethylcyclopentadienyl), in the presence and in the abse ...

2009

Abatement of organics and Escherichia coli by N, S co-doped TiO2 under UV and visible light. Implications of the formation of singlet oxygen (1O2) under visible light

László Forró, Juan Kiwi, César Pulgarin, Andrzej Sienkiewicz, Julian Andrés Rengifo Herrera

2009

Towards electron spin resonance of mechanically exfoliated graphene

László Forró, Andrzej Sienkiewicz, Arnaud Magrez, Bálint Náfrádi, Marijana Mionic Ebersold, Luka Ciric

We have attempted to prepare graphene samples by mechanical exfoliation of HOPG (highly oriented pyrolytic graphite) using scotch tape. Random testing of the flakes by AFM has shown in majority single layer graphene. Nevertheless, the presence of ultrathin ...

2009

La@C82 as a spin-active filling of SWCNTs: ESR study of magnetic and photophysical properties

László Forró, Andrzej Sienkiewicz, Arnaud Magrez, Bálint Náfrádi, Katarzyna Pierzchala, Luka Ciric, Duncan Thomas Lindsay Alexander

Electron microscopy (TEM) and electron spin resonance ESR) were applied to characterize lanthanum metallofullerene(La@C82)-filled peapods. The peapods were prepared by encapsulation of La@C82 in SWCNTs, which were obtained by laser ablation technique in th ...

2008

Continuous-wave far-infrared ESR spectrometer for high-pressure measurements

László Forró, Andrzej Sienkiewicz, Richard Gaal, Bálint Náfrádi

We present a newly-developed microwave probe for performing sensitive high-field/multi-frequency electron spin resonance (ESR) measurements under high hydrostatic pressures. The system consists of a BeCu-made pressure-resistant vessel, which accommodates t ...

Academic Press Inc - Elsevier Science2008

Singlet oxygen ((1)Delta(g))-mediated oxidation of cellular and subcellular components: ESR and AFM assays

László Forró, Andrzej Kulik, Andrzej Sienkiewicz, Sandor Kasas

We report a comprehensive in vitro study of the photo-oxidative stress on different biomolecular and cellular targets generated in the presence of fullerol C-60(OH)(n), a novel, fullerene-based and water-soluble sensitizer of singlet oxygen ((1)Delta(g)). ...

Institute of Physics2005

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