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Juan Kiwi

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Related publications (117)

Sputtered Cu-polyethylene films inducing bacteria inactivation in the dark and under low intensity sunlight

Juan Kiwi, César Pulgarin, Oualid Baghriche, Sami Rtimi, Laura Victoria Suárez Murillo

This study addresses the preparation of uniform, adhesive and robust thin Cu-polyethylene films (PE-CuOx) by direct current magnetron sputtering (DCMS). Cu-coatings of 25 nm sputtered with 60W deposited 0.16% weight Cu/weight PE leading to the fastest bact ...

Elsevier Science Sa2016

Quasi-Instantaneous Bacterial Inactivation on Cu-Ag Nanoparticulate 3D Catheters in the Dark and Under Light: Mechanism and Dynamics

Juan Kiwi, César Pulgarin, Rosendo Sanjines, Sami Rtimi

The first evidence for Cu-Ag (50%/50%) nanoparticulate hybrid coatings is presented leading to a complete and almost instantaneous bacterial inactivation in the dark (

Amer Chemical Soc2016

In Vitro and In Vivo Effectiveness of an Innovative Silver-Copper Nanoparticle Coating of Catheters To Prevent Methicillin-Resistant Staphylococcus aureus Infection

Juan Kiwi, César Pulgarin, Sami Rtimi, Myriam Koumba Sarah Ballo

In this study, silver/copper (Ag/Cu)-coated catheters were investigated for their efficacy in preventing methicillin-resistant Staphylococcus aureus (MRSA) infection in vitro and in vivo. Ag and Cu were sputtered (67/33% atomic ratio) on polyurethane cathe ...

American Society for Microbiology2016

Stable Photocatalytic Paints Prepared from Hybrid Core-Shell Fluorinated/Acrylic/TiO2 Waterborne Dispersions

Juan Kiwi, César Pulgarin, Sami Rtimi

The contamination of air and water is one of the major concerns towards the development of a sustainable world in the 21st century. In this context many efforts are devoted to the design of photocatalytic paints able to degrade chemical and biological impu ...

Mdpi Ag2016

Innovative photo-Fenton catalysis by PE-FeOx films leading to methylene blue (MB) degradation: Kinetics, surface properties and mechanism

Juan Kiwi, César Pulgarin, Rosendo Sanjines, Laura Victoria Suárez Murillo, Huiyu Dong

This study reports an innovative preparation polyethylene-FeOx (PE-FeOx films) leading to the degradation of the methylene blue (MB) dye under low intensity sunlight/visible light (>400 nm). The intermediate highly oxidative radicals generated by PE-FeOx l ...

Elsevier2016

Innovative self-sterilizing transparent Fe-phosphate polyethylene films under visible light

Juan Kiwi, César Pulgarin, Rosendo Sanjines, Sami Rtimi

An account of stable, uniform and adhesive high-density polyethylene terephthalate Fe-phosphate (FeOx-POx-HDPET) sputtered thin films showing absorption in the visible region up to 700 nm compared to POx presenting absorption below 300 nm. These film were ...

RSC Publishing2016

Method and Apparatus for Coating Nanoparticulate Films on Complex Substrates

Juan Kiwi, César Pulgarin, Sami Rtimi

Active films and processes for depositing the same onto a complex 3D shape substrates and implants are provided. The process comprises the following steps: inserting into a process chamber a sputtering target, including at least two chemical elements and a ...

2016

New evidence for Cu-decorated binary-oxides mediating bacterial inactivation/mineralization in aerobic media

Michaël Bensimon, Juan Kiwi, César Pulgarin, Sami Rtimi

Binary oxide semiconductors TiO2-ZrO2 and Cu-decorated TiO2-ZrO2 (TiO2-ZrO2-Cu) uniform films were sputtered on polyester (PES). These films were irradiated under low intensity solar simulated light and led to bacterial inactivation in aerobic and anaerobi ...

Elsevier2016

Bactericidal activity and mechanism of action of copper-sputtered flexible surfaces against multidrug-resistant pathogens

Juan Kiwi, César Pulgarin, Sami Rtimi, Myriam Koumba Sarah Ballo

Using direct current magnetron sputtering (DCMS), we generated flexible copper polyester surfaces (Cu-PES) and investigated their antimicrobial activity against a range of multidrug-resistant (MDR) pathogens including eight Gram-positive isolates (three me ...

Springer Verlag2016

Supported TiO2 films deposited at different energies: Implications of the surface compactness on the catalytic kinetics

Michaël Bensimon, Juan Kiwi, César Pulgarin, Rosendo Sanjines, Sami Rtimi, Stefanos Giannakis

Insight is provided in this study for the effect of the TiO2film densification/compactness on polyethy-lene (PE-TiO2) by sputtering TiO2at two very different energy levels. Uniform, adhesive low energy filmswere prepared by direct current magnetron sputter ...

Elsevier2016

Insight on the photocatalytic bacterial inactivation by co-sputtered TiO2-Cu in aerobic and anaerobic conditions

Michaël Bensimon, Juan Kiwi, César Pulgarin, Rosendo Sanjines, Sami Rtimi, Stefanos Giannakis

Co-sputtered TiO2-Cu polyester (TiO2-Cu-PES) under actinic light induced bacterial reduction of E. coli in the presence of O2 (air) and under anaerobic conditions. The bacterial inactivation/oxidation proceeds in the absence of O2 (air) probably due to the ...

Elsevier2016

New evidence for hybrid acrylic/TiO2 films inducing bacterial inactivation under low intensity simulated sunlight

Juan Kiwi, César Pulgarin, Sami Rtimi

This study addresses the preparation and characterization of hybrid films prepared from Titanium dioxide (TiO2) Pickering stabilized acrylic polymeric dispersion as well as their bacterial inactivation efficiency under sunlight irradiation. Complete bacter ...

Elsevier2015

Kinetics and mechanism for transparent polyethylene-TiO2 films mediated self-cleaning leading to MB dye discoloration under sunlight irradiation

Juan Kiwi, César Pulgarin, Rosendo Sanjines, Sami Rtimi

Polyethylene-TiO2 (from now on PE-TiO2) transparent, non-scattering sputtered films have been found effective in the discoloration of methylene blue (MB) under low intensity solar simulated light. By Fourier transform attenuated infrared spectroscopy (ATR- ...

Elsevier Science Bv2015

Preparation and Mechanism of Cu-Decorated TiO2-ZrO2 Films Showing Accelerated Bacterial Inactivation

Juan Kiwi, César Pulgarin, Rosendo Sanjines, Sami Rtimi

Antibacterial robust, uniform TiO2-ZrO2 films on polyester (PES) under low intensity sunlight irradiation made up by equal amounts of TiO2 and ZrO2 exhibited a much higher bacterial inactivation kinetics compared to pure TiO2 or ZrO2. The TiO2-ZrO2 matrix ...

Amer Chemical Soc2015

Innovative photocatalyst (FeOx–TiO2): transients induced by femtosecond laser pulse leading to bacterial inactivation under visible light

Michaël Bensimon, Juan Kiwi, César Pulgarin, Rosendo Sanjines, Sami Rtimi

This study reports the photosensitizing effect/mechanism of FeOx under visible light irradiation and charge transfer to TiO2 on FeOx–TiO2 cosputtered film. The transients which were photo-induced by femtosecond laser pulses at 545 nm (25 fs) were identifie ...

RSC Publishing2015

Novel FeOx–polyethylene transparent films: synthesis and mechanism of surface regeneration

Juan Kiwi, César Pulgarin, Rosendo Sanjines, Sami Rtimi

The first evidence for the synthesis of a uniform, adhesive polyethylene–FeOx (PE–FeOx) surface leading efficiently to bacterial inactivation is addressed in this study. PE was loaded with 0.04–0.08% Fe wt/wt PE after RF-plasma pretreatment was required to ...

RSC Publishing2015

New evidence for TiO2 uniform surfaces leading to complete bacterial reduction in the dark: Critical issues

Juan Kiwi, César Pulgarin, Danièle Laub, Sami Rtimi, Jelena Nesic

This study presents new evidence for the events leading to Escherichia coil reduction in the absence of light irradiation on TiO2-polyester (from now on TiO2-PES. By transmission electron microscopy (TEM) the diffusion of TiO2 NP's aggregates with the E. c ...

Elsevier Science Bv2014

Effect of surface pretreatment of TiO2 films on interfacial processes leading to bacterial inactivation in the dark and under light irradiation

Michaël Bensimon, Juan Kiwi, César Pulgarin, Rosendo Sanjines, Sami Rtimi, Jelena Nesic

Evidence is presented for radio-frequency plasma pretreatment enhancing the amount and adhesion of TiO2 sputtered on polyester (PES) and on polyethylene (PE) films. Pretreatment is necessary to attain a suitable TiO2 loading leading to an acceptable Escher ...

Royal Society, The2014

TiO2 and TiO2-Doped Films Able to Kill Bacteria by Contact: New Evidence for the Dynamics of Bacterial Inactivation in the Dark and under Light Irradiation

Juan Kiwi, César Pulgarin, Rosendo Sanjines, Sami Rtimi

This paper addresses recent developments in the design, evaluation, and characterization of flexible, uniform polyethylene-TiO2 (PE-TiO2), TiO2-In2O3, and TiO2-polyester able to inactivate bacteria under band gap irradiation and in the dark. The preparatio ...

Hindawi Publishing Corporation2014

Innovative transparent non-scattering TiO2 bactericide thin films inducing increased E. coli cell wall fluidity

Juan Kiwi, Lioubov Kiwi, Andrzej Kulik, César Pulgarin, Rosendo Sanjines, Sami Rtimi, Mariusz Andrzejczuk

This study presents the first account for transparent, non-scattering TiO2 films on radio-frequency (RF) plasma and ultraviolet light in the C-spectral region (UVC) pretreated polyethylene (PE). These pretreatments allow the PE to bind higher amounts of Ti ...

Elsevier Science Sa2014

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