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César Pulgarin

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Related publications (233)

Innovative TiO2/Cu Nanosurfaces Inactivating Bacteria in the Minute Range under Low-Intensity Actinic Light

Juan Kiwi, César Pulgarin, Rosendo Sanjines, Oualid Baghriche, Sami Rtimi

The bacterial inactivation of E. coli by cotton TiO2/Cu DC-magnetron sputtered thin films was investigated in the dark and under low-intensity actinic light. The TiO2/Cu sputtered layers revealed to be sensitive to actinic light showing the spectral charac ...

Amer Chemical Soc2012

Comparison of Methods for Evaluation of the Bactericidal Activity of Copper-Sputtered Surfaces against Methicillin-Resistant Staphylococcus aureus

Juan Kiwi, César Pulgarin

Bacteria can survive on hospital textiles and surfaces, from which they can be disseminated, representing a source of health care-associated infections (HCAIs). Surfaces containing copper (Cu), which is known for its bactericidal properties, could be an ef ...

American Society for Microbiology2012

Photocatalysis/catalysis by innovative TiN and TiN-Ag surfaces inactivate bacteria under visible light

Juan Kiwi, César Pulgarin, Rosendo Sanjines, Oualid Baghriche, Sami Rtimi

This study presents the design, preparation, testing and characterization of TiN and TiN-Ag nanoparticulate films leading to photocatalytic and catalytic inactivation of Escherichia coli. When Ti was sputtered in N2 atmosphere, the TiN films unexpectedly r ...

Elsevier2012

Inactivation of bacteria under visible light and in the dark by Cu films. Advantages of Cu-HIPIMS-sputtered films

Juan Kiwi, César Pulgarin

The Cu polyester thin-sputtered layers on textile fabrics show an acceptable bacterial inactivation kinetics using sputtering methods. Direct current magnetron sputtering (DCMS) for 40 s of Cu on cotton inactivated Escherichia coli within 30 min under visi ...

Springer Heidelberg2012

Antibacterial Ag-ZrN surfaces promoted by subnanometric ZrN-clusters deposited by reactive pulsed magnetron sputtering

Juan Kiwi, César Pulgarin, Rosendo Sanjines, Oualid Baghriche

Ag-ZrN films were deposited on polyester by direct current pulsed magnetron sputtering (from now on DCMSP) in Ar + N-2 atmosphere. ZrN on the polyester surface interacts with Ag leading to Ag-ZrN films. These composite films were more active in Escherichia ...

2012

Advantages of highly ionized pulse plasma magnetron sputtering (HIPIMS) of silver for improved E-coli inactivation

Juan Kiwi, César Pulgarin, Rosendo Sanjines, Oualid Baghriche

This study addresses the DC-magnetron sputtering (DCMS) of Ag-films on polyester and compares the results found for the E. coli inactivation with the inactivation obtained when applying highly ionized pulse plasma power magnetron sputtering (HIPIMS). The a ...

Elsevier2012

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

Mechanism of photocatalytic bacterial inactivation on TiO2 films involving cell-wall damage and lysis

Juan Kiwi, César Pulgarin

This article addresses the cell wall damage of Escherichia coil (from now on E. coil) by TiO2 suspensions. The dynamics of TiO2 photocatalysis by thin films layers is described. The films were characterized by FTIR spectroscopy and atomic force microscopy ...

Elsevier2012

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

Effect of the spectral properties of TiO2, Cu, TiO2/Cu sputtered films on the bacterial inactivation under low intensity actinic light

Juan Kiwi, César Pulgarin, Rosendo Sanjines, Oualid Baghriche, Sami Rtimi

Bacterial inactivation by TiO2, Cu and TiO2/Cu DC-magnetron sputtered thin films was systematically investigated in the dark and under low intensity visible/actinic light. Low intensity actinic light led to a fast 6log10 (complete) bacterial inactivation w ...

Elsevier2012

High power impulse magnetron sputtering (HIPIMS) and traditional pulsed sputtering (DCMSP) Ag-surfaces leading to E. coli inactivation

Juan Kiwi, César Pulgarin, Rosendo Sanjines, Oualid Baghriche

This study addresses the high power impulse magnetron sputtering (HIPIMS) deposition of Ag-nanoparticle films on polyester and the comparison with films deposited by direct current pulsed magnetron sputtering (DCMSP). The first evidence is presented for th ...

2012

The detrimental influence of bacteria (E. coli, Shigella and Salmonella) on the degradation of organic compounds (and vice versa) in TiO2 photocatalysis and near-neutral photo-Fenton processes under simulated solar light

César Pulgarin

TiO2 photocatalytic and near-neutral photo-Fenton processes were tested under simulated solar light to degrade two models of natural organic matter -resorcinol (R) (which should interact strongly with TiO2 surfaces) and hydroquinone (H) -separately or in t ...

2012

Significant decrease of THMs generated during chlorination of river water by previous photo-Fenton treatment at near neutral pH

César Pulgarin

An important issue in chlorine drinking water disinfection is the generation from natural organic matter (NOM) of disinfection by-products (DBPs), especially trihalomethanes (THMs). The THMs generation can be limited by reducing the levels of NOM prior to ...

2012

Ag-surfaces sputtered by DC and pulsed DC-magnetron sputtering effective in bacterial inactivation: Testing and characterization

Juan Kiwi, César Pulgarin, Rosendo Sanjines, Cristina del Socorro Lonfat, Oualid Baghriche

This study addresses the deposition of active, uniform nanoparticulate Ag-thin films on polyester textiles by DC-magnetron sputtering (DC) and pulsed DC-magnetron sputtering (DCP). The deposition of Ag on the polyester fiber was observed to be the function ...

2012

Design, testing and characterization of innovative TiN–TiO2 surfaces inactivating bacteria under low intensity visible light

Juan Kiwi, César Pulgarin, Rosendo Sanjines, Oualid Baghriche, Sami Rtimi

Ti was sputtered in a plasma chamber under a N2 atmosphere, depositing TiN films on polyester fibers. These films show a significant adsorption in the visible spectral region. A TiN layer 50 nm thick sputtered for 3 min under low intensity/actinic visible ...

Royal Soc Chemistry2012

Photo-Fenton degradation of resorcinol mediated by catalysts based on iron species supported on polymers

César Pulgarin, Félicien Mazille

Novel Fe supported catalysts were prepared by immobilizing iron species on commercial polyethylene via three different methods: (1) acidic pre-treatment of the polyethylene followed by impregnation in aqueous Fe(NO3)(3), (2) TiO2 photo-catalytic pre-treatm ...

2011

New Fe-immobilized natural bentonite plate used as photo-Fenton catalyst for organic pollutant degradation

César Pulgarin

Novel photo-Fenton catalysts were prepared by immobilizing iron species on commercial bentonite plates via two methods: (1) ion exchange reaction (Fe3+ vs. Na+) by aqueous suspension powder-clay/FeCl3 followed by plate preparation, and (2) forced hydrolysi ...

Elsevier2011

Photocatalytic discoloration of aqueous malachite green solutions by UV-illuminated TiO2 nanoparticles under air and nitrogen atmospheres: effects of counter-ions and pH

César Pulgarin, Christophe Roussel

Under air atmosphere, the photocatalytic discoloration of malachite green (MG) aqueous solutions (a triphenylmethane dye) in the presence of TiO2 and UV light followed an oxidative pathway, involving an N-demethylation process evidenced by a blue shifting ...

2011

Effects of sonochemical parameters and inorganic ions during the sonochemical degradation of crystal violet in water

César Pulgarin, Fernando Guzman Duque

This work deals with the ultrasonic degradation (800 kHz) of crystal violet (CV) under different experimental conditions. The effects of saturating gas (argon, carbon dioxide and air), CV concentration (2.45-1225 mu mol L-1), pH (3-9) and power (20-80 W) w ...

2011

Photocatalytic evaluation of TiO2/nylon systems prepared at different impregnation times

Juan Kiwi, César Pulgarin

TiO2/nylon fabrics were investigated for methanol degradation under UV light irradiation. TiO2 Degussa P-25 was supported on nylon by immersing the nylon in sol-gel TiO2 and silicone. The TiO2 layers on the nylon were explored as a function of the time of ...

Elsevier2011

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