O. Baghriche
École Polytechnique Fédérale de Lausanne
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Publication
Featured researches published by O. Baghriche.
ACS Applied Materials & Interfaces | 2012
O. Baghriche; Sami Rtimi; Cesar Pulgarin; R. Sanjinés; J. Kiwi
The bacterial inactivation of E. coli by cotton TiO(2)/Cu DC-magnetron sputtered thin films was investigated in the dark and under low-intensity actinic light. The TiO(2)/Cu sputtered layers revealed to be sensitive to actinic light showing the spectral characteristics of Cu/CuO. This indicates that Cu does not substitute Ti(4+) in the crystal lattice. Under diffuse actinic light (4 mW/cm(2)), the hybrid composite TiO(2)/Cu sample lead to fast bacterial inactivation times <5 min. This study presents evidence for a direct relation between the film optical absorption obtained by diffuse reflectance spectroscopy (DRS) and the bacterial inactivation kinetics by the TiO(2)/Cu samples. The Cu-ions inactivating the bacteria were followed in solution by inductively plasma coupled spectroscopy (ICPS). The amounts of Cu-ions detected by ICPS provide the evidence for an oligodynamic antibacterial effect. The changes in the oxidation state of Cu during bacterial inactivation were followed by XPS. The E. coli cell viability was detected by standard coliform counting CFU methods. The TiO(2)/Cu thickness layer was determined by profilometry and the film microstructure by XPS, TEM, AFM, XRD, XRF and contact angle (CA). A mechanism of bacterial inactivation by TiO(2)/Cu samples is suggested in terms of interfacial charge transfer (IFCT) involving charge transfer between TiO(2) and Cu.
RSC Advances | 2012
Sami Rtimi; O. Baghriche; Cesar Pulgarin; R. Sanjinés; J. Kiwi
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 light led to the fastest bacterial inactivation (120 min). These innovative TiN nanoparticulate films were characterized by XPS, DRS and TEM.
RSC Advances | 2013
Sami Rtimi; Cesar Pulgarin; O. Baghriche; John Kiwi
Novel ultrathin TiO2–Cu nanoparticulate films sputtered by highly ionized pulsed plasma magnetron sputtering (HIPIMS) lead to faster bacterial inactivation compared to more traditional sputtering approaches with an appreciable metal saving. HIPIMS sputtering induces a strong interaction of the TiO2–Cu-ions (M+) with the polyester surface due to the high fraction and density of M+-ions interacting with the biased substrate.
Journal of Photochemistry and Photobiology A-chemistry | 2013
O. Baghriche; Sami Rtimi; Cesar Pulgarin; R. Sanjinés; J. Kiwi
Surface & Coatings Technology | 2013
Sami Rtimi; O. Baghriche; Cesar Pulgarin; J.-C. Lavanchy; John Kiwi
Journal of Physical Chemistry C | 2011
Ewelina Kusiak-Nejman; Antoni W. Morawski; Arutiun P. Ehiasarian; Cesar Pulgarin; O. Baghriche; E. Mielczarski; Jerzy A. Mielczarski; A. J. Kulik; J. Kiwi
Journal of Photochemistry and Photobiology A-chemistry | 2013
Sami Rtimi; O. Baghriche; R. Sanjinés; Cesar Pulgarin; Michaël Bensimon; John Kiwi
Surface & Coatings Technology | 2012
O. Baghriche; C. Ruales; R. Sanjinés; Cesar Pulgarin; A. Zertal; I. Stolitchnov; J. Kiwi
Journal of Photochemistry and Photobiology A-chemistry | 2012
O. Baghriche; Arutiun P. Ehiasarian; Ewelina Kusiak-Nejman; Cesar Pulgarin; R. Sanjinés; Antoni W. Morawski; J. Kiwi
Applied Catalysis B-environmental | 2013
O. Baghriche; Sami Rtimi; Cesar Pulgarin; Christophe Roussel; J. Kiwi