Recherche

Afficher tous les résultats pour

Accueil

Personne

Andrzej Sienkiewicz

À propos
Confidentialité
Mentions légales

Graph Chatbot

Publications associées (74)

Neutral Aminyl Radicals Derived from Azoimidazolium Dyes

Andrzej Sienkiewicz, Kay Severin, Rosario Scopelliti, Euro Solari, Philip Pattison, Laurent Alexis Clément Vannay, Henrik Moodysson Rønnow, Léonard Yannick Maurice Eymann, Ivica Zivkovic, Matthew Wodrich, Alexander Tskhovrebov, José Luis Bila

The synthesis and characterization of a new class of neutral aminyl radicals is reported. Monoradicals were obtained by reduction of azoimidazolium dyes with potassium. Structural, spectroscopic, and computational data suggest that the spin density is cent ...

2016

Single potassium niobate nano/microsized particles as local mechano-optical Brownian probes

László Forró, Andrzej Sienkiewicz, Sylvia Jeney, Arnaud Magrez, Flavio Maurizio Mor

Perovskite alkaline niobates, due to their strong nonlinear optical properties, including birefringence and the capability to produce second-harmonic generation (SHG) signals, attract a lot of attention as potential candidates for applications as local nan ...

Royal Soc Chemistry2016

Controlled growth of CH3NH3PbI3 nanowires in arrays of open nanofluidic channels

László Forró, Andrzej Sienkiewicz, Bálint Náfrádi, Massimo Spina, Endre Horvath, Eric Joseph Bonvin

Spatial positioning of nanocrystal building blocks on a solid surface is a prerequisite for assembling individual nanoparticles into functional devices. Here, we report on the graphoepitaxial liquid-solid growth of nanowires of the photovoltaic compound CH ...

Nature Research2016

Cerium oxide nanoparticles, combining antioxidant and UV shielding properties, prevent UV-induced cell damage and mutagenesis

Andrzej Sienkiewicz, Fanny Caputo

Efficient inorganic UV shields, mostly based on refracting TiO2 particles, have dramatically changed the sun exposure habits. Unfortunately, health concerns have emerged from the pro-oxidant photocatalytic effect of UV-irradiated TiO2, which mediates toxic ...

Royal Soc Chemistry2015

Deleterious effect of homogeneous and heterogeneous near-neutral photo-Fenton system on Escherichia coli. Comparison with photo-catalytic action of TiO2 during cell envelope disruption

César Pulgarin, Andrzej Sienkiewicz, Cristina del Socorro Lonfat

The mechanisms underlying bacterial inactivation by solar photo-Fenton at near-neutral pH have not yet been investigated in detail. In particular, no consensus exists on the bacterial inactivation mechanism under solar light enhanced by the Fenton's reagen ...

Elsevier Science Bv2014

Upconversion Particle as a Local Luminescent Brownian Probe: A Photonic Force Microscopy Study

László Forró, Andrzej Sienkiewicz, Sylvia Jeney, Flavio Maurizio Mor

Near-infrared (NIR) light sensitive lanthanide-doped NaYF4 upconversion particles (UCPs) are gaining increasing attention as local probes in biomedical applications. Here, we implemented a photonic force microscope (PFM) to manipulate and study the optical ...

Amer Chemical Soc2014

Stimulus-responsive polymer nanoreactors for efficient photodynamic therapy

Andrzej Sienkiewicz

Amer Chemical Soc2014

Loading and release of internally self-assembled emulsions embedded in a magnetic hydrogel

László Forró, Andrzej Sienkiewicz, Katarzyna Pierzchala

We have investigated drug loading and release from thermosensitive gel emulsions with external triggering by an alternating magnetic field (AMF) for on-demand drug delivery. Superparamagnetic iron oxide nanoparticles dispersed in gel emulsions were used to ...

Amer Inst Physics2014

Degradation of Eight Relevant Micropollutants in Different Water Matrices by Neutral Photo-Fenton Process under UV254 and Simulated Solar Light Irradiation – a comparative study

Luiz Felippe De Alencastro, Dominique Grandjean, César Pulgarin, Andrzej Sienkiewicz

This is a comparative study of photolytic degradation under exposure to UV254 nm and solar-simulator irradiation of a mixture of eight equally concentrated relevant micropollutants in the presence of H2O2 and Fe(II) in ultrapure water, Lake Geneva water, a ...

Elsevier Science Bv2014

Uptake and intracellular trafficking of superparamagnetic iron oxide nanoparticles (SPIONs) in plants

Andrzej Sienkiewicz

The uptake and movement of iron nanoparticles in elodea plants have been detected by the ESR method. This method is applied for the first time for the monitoring of the translocation, movement and uptake iron nanoparticles in plant organs. Exposition of st ...

Inst Materials Physics2014

Cryogenic single-chip electron spin resonance detector

Stefano Alberti, László Forró, Andrzej Sienkiewicz, Giovanni Boero, Jens Anders, Gabriele Gualco

We report on the design and characterization of a single-chip electron spin resonance detector, operating at a frequency of about 20 GHz and in a temperature range extending at least from 300 K down to 4 K. The detector consists of an LC oscillator formed ...

Academic Press Inc - Elsevier Science2014

Highly efficient bacteria inactivation and phenol degradation by visible light irradiated iodine doped TiO2

László Forró, Andrzej Sienkiewicz, Klara Hernadi

In this study visible light active iodine doped titanium dioxide samples prepared by sol-gel method were investigated. Photocatalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray fluorescence spectroscopy (XF ...

Elsevier Science Bv2013

Light-responsive polymer nanoreactors: a source of reactive oxygen species on demand

Andrzej Sienkiewicz

Various domains present the challenges of responding to stimuli in a specific manner, with the desired sensitivity or functionality, and only when required. Stimuli-responsive systems that are appropriately designed can effectively meet these challenges. H ...

Royal Soc Chemistry2013

A Multi-Step Single-Crystal-to-Single-Crystal Bromodiacetylene Dimerization

Andrzej Sienkiewicz, Rosario Scopelliti, Anne-Clémence Corminboeuf, Holger Frauenrath, Stephen Schrettl, Roman Niklaus Marty, Tobias Hoheisel

Packing constraints and precise placement of functional groups are the reason that organic molecules in the crystalline state often display unusual physical or chemical properties not observed in solution. Here we report a single-crystal-to-single-crystal ...

Nature Publishing Group2013

Comparison of the photocatalytic efficiencies of bare and doped rutile and anatase TiO2 photocatalysts under visible light for phenol degradation and E. coli inactivation

László Forró, Andrzej Sienkiewicz, Klara Hernadi

This study aimed at comparing the photocatalytic efficiencies of various TiO2 based photocatalysts for phenol degradation and bacteria inactivation under illumination with visible light. Commercial undoped anatase and rutile (both from Aldrich), Aeroxide P ...

Elsevier Science Bv2013

Photocatalytic production of O-1(2) and (OH)-O-center dot mediated by silver oxidation during the photoinactivation of Escherichia coli with TiO2

César Pulgarin, Andrzej Sienkiewicz

Ag loaded TiO2 was applied in the photocatalytic inactivation of Escherichia coil under ultraviolet (UV) and visible (Vis) light irradiations. Ag enhanced the TiO2 photodisinfecting effect under Vis irradiation promoting the formation of singlet oxygen and ...

Elsevier2012

Defects and localization in chemically-derived graphene

László Forró, Andrzej Sienkiewicz, Richard Gaal, Arnaud Magrez, Luka Ciric, Jacim Jacimovic, George Cristian Vaju

We have performed electron spin resonance (ESR) measurements on a large assembly of graphene oxide (GO) and reduced graphene oxide (RGO) flakes. In GO samples the Curie tail is coming from 1.4 x 10(18) cm(-3) of localized spins. Although reduction of GO wa ...

Amer Physical Soc2012

Low-frequency ultrasound induces oxygen vacancies formation and visible light absorption in TiO2 P-25 nanoparticles

César Pulgarin, Andrzej Sienkiewicz, Julian Andrés Rengifo Herrera

Low-frequency ultrasound (LFUS) irradiation induces morphological, optical and surface changes in the commercial nano-TiO2-based photocatalyst, Evonik-Degussa P-25. Low-temperature electron spin resonance (ESR) measurements performed on this material provi ...

2012

Photocatalytic and phototoxic properties of TiO2-based nanofilaments: ESR and AFM assays

László Forró, Andrzej Kulik, Andrzej Sienkiewicz, Arnaud Magrez, Katarzyna Pierzchala

There is uncertainty in understanding of the relationship between physico-chemical parameters of nanosized titanium dioxide (nano-TiO2) and its toxicity when brought into contact with living cells. This study provides a multidisciplinary experimental insig ...

Informa Healthcare2012

Magnetism in nanoscale graphite flakes as seen via electron spin resonance

László Forró, Andrzej Sienkiewicz, Zeljko Sljivancanin, Arnaud Magrez, Luka Ciric, Jacim Jacimovic

Magnetic properties of a large assembly of ultrathin graphitic particles obtained by heavy sonication of graphite powder dispersed in N-methylpyrrolidone were measured by electron-spin resonance (ESR). The ESR signal was decomposed into one narrow and one ...

American Physical Society2012

Page 3 sur 4