Innovative High-Surface-Area CuO Pretreated Cotton Effective in Bacterial Inactivation under Visible Light

Torres, Ana E.; Ruales, C.; Pulgarín, C.; Aimable, Anne; Bowen, Paul; Sarria, V.; Kiwi, J.

doi:10.1021/am100370y

Cited by 60 publications

(25 citation statements)

References 29 publications

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“…[3][4][5] The TiO 2 was sputtered by direct current magnetron sputtering (DC) on polyethylene as reported out of our laboratory. 4,8 Before sputtering the films, the residual pressure P r in the sputtering chamber was set to P r ¡ 10 24 Pa. The substrate target distance was set at 10 cm.…”

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confidence: 99%

“…[1][2][3][4] Several methods are used to prepare TiO 2 thin films, based on sol-gel processing depending on the heat resistant of the selected substrate. Sol-gel processing is the most commercially commonly used method to prepare TiO 2 films 5 but the thickness of the TiO 2 films is not reproducible, they…”

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confidence: 99%

“…2,6 RF-plasma pretreatment of surfaces enhancing the antibacterial activity has been reported. [3][4][5] The RF-plasma pretreatment of PE induces negatively charged functional groups, e.g., carboxylic, percarboxylic, epoxide and peroxide groups by the atomic O, excited O, anionic and cationic O in the gas in the RF chamber. These O-species interact with the functionalized -CH 2 -CH 2 -groups of PE binding TiO 2 by electrostatic attraction.…”

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Innovative semi-transparent nanocomposite films presenting photo-switchable behavior and leading to a reduction of the risk of infection under sunlight

2013

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Innovative semi-transparent nanocomposite films presenting photo-switchable behavior and leading to a reduction of the risk of infection under sunlight shows that the increase in the cell lipid-layer fluidity leads to cell wall scission/bacterial inactivation.The stable, strong adhesion of TiO 2 films to glass, iron plates, textile fabrics and thin polymer films active under solar light irradiation is a subject of timely research involving TiO 2 selfcleaning and inactivation properties. [1][2][3][4] Several methods are used to prepare TiO 2 thin films, based on sol-gel processing depending on the heat resistant of the selected substrate. Sol-gel processing is the most commercially commonly used method to prepare TiO 2 films 5 but the thickness of the TiO 2 films is not reproducible, theyare not mechanically stable, and they exhibit low adhesion since they can be wiped off by a cloth or thumb. 6-8 Polyethylene (PE) is a low cost, inert and mechanically strong thin flexible polymer. For this reason PE has been selected as the support for the semitransparent TiO 2 films we report in this study. The low surface energy of PE leads to poor particle adhesion. For this reason the PE was pretreated by RF and UVC to produce highly functional self-cleaning and anti-bacterial coatings increasing the surface sites able to bind TiO 2 nanoparticles. 7 The plasma pretreatment has been reported to increase the polymer polarity, roughness and hydrophilicity, improving its binding capacity and interfacial adhesion. 2,6 RF-plasma pretreatment of surfaces enhancing the antibacterial activity has been reported. The objectives of this study are: a) to present RF-plasma pretreated TiO 2 -PE sputtered uniform adherent films showing fast bacterial inactivation kinetics, b) to show light induced hydrophobic to hydrophilic reversible switchable behavior in PE-TiO 2 films and c) to show by ATR-FTIR that the increase in the cell lipid layer fluidity during the loss of cell viability leads to bacterial cellwall scission.The low density polyethylene (LDPE) consists of highly branched low crystalline semi-transparent film with the formula H(CH 2 -CH 2 ) n H. The PE was pretreated in the cavity of the RFplasma unit (Harrick Corp. 13.56 MHz, 100 W).3,8 The details of both pretreatment methods on C-rich surfaces have been recently described. [3][4][5] The TiO 2 was sputtered by direct current magnetron sputtering (DC) on polyethylene as reported out of our laboratory. 4,8 Before sputtering the films, the residual pressure P r in the sputtering chamber was set to P r ¡ 10 24 Pa. The substrate target distance was set at 10 cm. The TiO 2 thin films were deposited by reactive DC-magnetron sputtering (DC) in an O 2 gas flow from a 5 cm diameter Ti-target 99.99% pure (Kurt J. Lesker, East Sussex, UK). The current on the Ti target was set at 280 mA, at a power of 128 Watt (2518 V). The samples of Escherichia coli (E. coli K12) were obtained from the Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH (DSMZ) ATCC23716, Braunschweig, Germany, to te...

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Innovative semi-transparent nanocomposite films presenting photo-switchable behavior and leading to a reduction of the risk of infection under sunlight

2013

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“…Hashimoto et al [20] have reported the preparation of the Cu and TiO 2 /Cu films by sol-gel methods presenting bactericide action under visible light. Further colloidal Cu-coated textiles showing antibacterial properties have been prepared and tested in our laboratory [21,22]. The particular interest in Cu-textiles is based on the fact that the porous hydrophilic structure of textiles provides a suitable environment for bacterial growth.…”

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confidence: 99%

Comparison of HIPIMS sputtered Ag- and Cu-surfaces leading to accelerated bacterial inactivation in the dark

Rtimi

Baghriche

Pulgarín

et al. 2014

Surface and Coatings Technology

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Recently, compact uniform and adhesive films of Ag and Cu have been prepared by DC-magnetron sputtering (DC), pulsed DC magnetron sputtering (DCP) and high power impulse magnetron sputtering (HIPIMS). This study reports the HIPIMS deposition for Ag and Cu on textile fabrics, the bacterial inactivation kinetics and the nature of the species in the plasma produced during HIPIMS sputtering. The deposition rates of Ag and Cu atoms and the bacterial inactivation times are reported in the dark and under light as a function of the applied peak currents during the sputtering by HIPIMS. By X-ray photoelectron spectroscopy (XPS), the surface percentage atomic concentration and the oxidation state changes are reported during bacterial inactivation. The Ar and metal-ions produced in the magnetron chamber were determined by mass spectroscopy (QMS). A mechanism for the bacterial inactivation is suggested for Ag and Cu HIPIMS sputtered surfaces.

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“…Currently, the biocidal property of copper and its oxides is used in the design of polymer materials for biomedical devices, 4 in bactericide textiles 5 and antifouling paints, 6,7 to name a few. The adhesion is the first step of bacterial pathogenesis and depends on the nature of the material surface and the bacteria involved.…”

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confidence: 99%

PVC/Copper Oxide Composites and Their Effect on Bacterial Adherence

Rodríguez-Llamazares¹,

Mondaca²,

Badilla³

et al. 2012

J. Chil. Chem. Soc.

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In this work, PVC/CuO and PVC/Cu 2 O composites were prepared by melt-blending method. The results of scanning electron microscopy (SEM) -X ray energy dispersive spectroscopy (EDS) Cu-mapping showed that the composites are a hybrid of the polymer and the copper oxide particles, and these particles were distributed uniformly in the polymer matrix. The adherence of Escherichia coli ATCC 25922 on the surface of composite materials was assessed through the inventory of adhered viable cells and SEM analysis. In PVC/copper oxide composite, the number of adhered bacterial cells was reduced by almost 2 units log 10 with regard to those adhere to the pure PVC polymer. SEM images of composite materials showed a significant decrease in bacterial adherence when compared to the pure polymer. It was also found through transmission electron microscopy (TEM) images to that E. coli incubated in the presence of cuprous oxide (Cu 2 O) and cupric oxide (CuO) microparticles go through structural and morphological changes at the membrane level. Bacterial cells incubated in the presence of Cu 2 O were bacillary with blunt ends, and their size was reduced by 30% when compared to those incubated in the absence of copper oxides. The results obtained indicate that the PVC/copper oxide composites inhibit the adhesion of E. coli to their surface.

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Innovative High-Surface-Area CuO Pretreated Cotton Effective in Bacterial Inactivation under Visible Light

Cited by 60 publications

References 29 publications

Innovative semi-transparent nanocomposite films presenting photo-switchable behavior and leading to a reduction of the risk of infection under sunlight

Innovative semi-transparent nanocomposite films presenting photo-switchable behavior and leading to a reduction of the risk of infection under sunlight

Comparison of HIPIMS sputtered Ag- and Cu-surfaces leading to accelerated bacterial inactivation in the dark

PVC/Copper Oxide Composites and Their Effect on Bacterial Adherence

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