Structure-reactivity relations for DC-magnetron sputtered <font>Cu</font>-layers during <i>E. coli</i> inactivation in the dark and under light

Castro, Camilo A.; Sanjinés, R.; Pulgarín, C.; Osorio, Paula; Giraldo, Sonia A.; Kiwi, J.

doi:10.1142/9789814354868_0036

Cited by 10 publications

(27 citation statements)

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“…The significantly higher bacterial inactivation activity of the Cu fixed on cotton by DCMSP suggests that Cu sites exposed on the surface or inside the cotton interact with E. coli regardless of any agglomeration on the surface of the cotton fiber. This is different to the cotton with DCMS samples (Castro et al 2010) where the catalytic activity per atom decreases due to the agglomeration of Cu nanoparticles at higher sputtering times. Figure 3 presents the inactivation times for E. coli obtained by HIPIMS Cu samples at 6 amps when the sputtering has been applied between 2 and 21 s (Kusiak-Nejman et al 2011).…”

Section: Resultscontrasting

confidence: 60%

“…DC-magnetron sputtered semi-transparent Cu gray-brown films (Castro et al 2010) on cotton are effective in the inactivation of E. coli K12. Figure 1 shows the inactivation of E. coli on Cu-sputtered samples by DC pulsed magnetron sputtering (DCMS).…”

Section: Resultsmentioning

confidence: 99%

“…The film thickness was determined with a profilometer (Alphastep500, TENCOR). A stylus, loaded with 4 mg and a tip radius of 5 μm probed the film surface (Castro et al 2010).…”

Section: Experimental Section: Materials and Methodsmentioning

confidence: 99%

“…Agar plates were incubated, lid down, at 37°C for 24 h before colonies were counted. The experiments reported were replicated at three times (Castro et al 2010). …”

Section: Experimental Section: Materials and Methodsmentioning

confidence: 99%

“…Recently, our group has reported direct current magnetron sputtering by DCMS (Castro et al 2010) and direct current magnetron pulsed sputtering by DCMSP (Osorio et al 2011) to deposit Cu on textiles.…”

Section: Introductionmentioning

confidence: 99%

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

Ehiasarian

Pulgarín

Kiwi

2012

Environ Sci Pollut Res

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Introduction The Cu polyester thin-sputtered layers on textile fabrics show an acceptable bacterial inactivation kinetics using sputtering methods. Materials and methods Direct current magnetron sputtering (DCMS) for 40 s of Cu on cotton inactivated Escherichia coli within 30 min under visible light and within 120 min in the dark. For a longer DCMS time of 180 s, the Cu content was 0.294% w/w, but the bacterial inactivation kinetics under light was observed within 30 min, as was the case for the 40-s sputtered sample. Results and discussion This observation suggests that Cu ionic species play a key role in the E. coli inactivation and these species were further identified by X-ray photoelectron spectroscopy (XPS). The 40-s sputtered samples present the highest amount of Cu sites held in exposed positions interacting on the cotton with E. coli. Cu DC magnetron sputtering leads to thin metallic semi-transparent gray-brown Cu coating composed by Cu nanoparticulate in the nanometer range as found by electron microscopy (EM). Cu cotton fabrics were also functionalized by bipolar asymmetric DCMSP. ConclusionSputtering by DCMS and DCMSP for longer times lead to darker and more compact Cu films as detected by diffuse reflectance spectroscopy and EM. Cu is deposited on the polyester in the form of Cu 2 O and CuO as quantified by XPS. The redox interfacial reactions during bacterial inactivation involve changes in the Cu oxidation states and in the oxidation intermediates and were followed by XPS. High-power impulse magnetron sputtering (HIPIMS)-sputtered films show a low rugosity indicating that the texture of the Cu nanoparticulate films were smooth. The values of R q and R a were similar before and after the E. coli inactivation providing evidence for the stability of the HIPIMSdeposited Cu films. The Cu loading percentage required in the Cu films sputtered by HIPIMS to inactivate E. coli was about three times lower compared to DCMS films. This indicates a substantial Cu metal savings within the preparation of antibacterial films.

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Section: Resultscontrasting

confidence: 60%

Section: Resultsmentioning

confidence: 99%

“…The film thickness was determined with a profilometer (Alphastep500, TENCOR). A stylus, loaded with 4 mg and a tip radius of 5 μm probed the film surface (Castro et al 2010).…”

Section: Experimental Section: Materials and Methodsmentioning

confidence: 99%

“…Agar plates were incubated, lid down, at 37°C for 24 h before colonies were counted. The experiments reported were replicated at three times (Castro et al 2010). …”

Section: Experimental Section: Materials and Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Ehiasarian

Pulgarín

Kiwi

2012

Environ Sci Pollut Res

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Copper-enriched diamond-like carbon coatings promote regeneration at the bone–implant interface

Milan

Khamseh

Zarrintaj

et al. 2020

Heliyon

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There have been several attempts to design innovative biomaterials as surface coatings to enhance the biological performance of biomedical implants. The objective of this study was to design multifunctional Cu/a-C:H thin coating depositing on the Ti-6Al-4V alloy (TC4) via magnetron sputtering in the presence of Ar and CH 4 for applications in bone implants. Moreover, the impact of Cu amount and sp 2 /sp 3 ratio on the interior stress, corrosion behavior, mechanical properties, and tribological performance and biocompatibility of the resulting biomaterial was discussed. X-ray photoelectron spectroscopy (XPS) revealed that the sp 2 /sp 3 portion of the coating was enhanced for samples having higher Cu contents. The intensity of the interior stress of the Cu/a-C:H thin bio-films decreased by increase of Cu content as well as the sp 2 /sp 3 ratio. By contrast, the values of Young's modulus, the H 3 /E 2 ratio, and hardness exhibited no significant difference with enhancing Cu content and sp 2 /sp 3 ratio. However, there was an optimum Cu content (36.8 wt.%) and sp 2 /sp 3 ratio (4.7) that it is feasible to get Cu/ a-C:H coating with higher hardness and tribological properties. Electrochemical impedance spectroscopy test results depicted significant improvement of Ti-6Al-4V alloy corrosion resistance by deposition of Cu/a-C:H thin coating at an optimum Ar/CH 4 ratio. Furthermore, Cu/a-C:H thin coating with higher Cu contents showed better antibacterial properties and higher angiogenesis and osteogenesis activities. The coated samples inhibited the growth of bacteria as compared to the uncoated sample (p < 0.05). In addition, such coating composition can stimulate angiogenesis, osteogenesis and control host response, thereby increasing the success rate of implants. Moreover, Cu/a-C:H thin films encouraged development of blood vessels on the surface of titanium alloy when the density of grown blood vessels was increased with enhancing the Cu amount of the films. It is speculated that such coating can be a promising candidate for enhancing the osseointegration features.

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Effect of surface pretreatment of TiO ₂ films on interfacial processes leading to bacterial inactivation in the dark and under light irradiation

et al. 2015

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Evidence is presented for radio-frequency plasma pretreatment enhancing the amount and adhesion of TiO 2 sputtered on polyester (PES) and on polyethylene (PE) films. Pretreatment is necessary to attain a suitable TiO 2 loading leading to an acceptable Escherichia coli reduction kinetics in the dark or under light irradiation for PES–TiO 2 and PE–TiO 2 samples. The amount of TiO 2 on the films was monitored by diffuse reflectance spectroscopy and X-ray fluorescence. X-ray electron spectroscopy shows the lack of accumulation of bacterial residues such as C, N and S during bacterial inactivation since they seem to be rapidly destroyed by TiO 2 photocatalysis. Evidence was found for Ti 4+ /Ti 3+ redox catalysis occurring on PES–TiO 2 and PE–TiO 2 during the bacterial inactivation process. On PE–TiO 2 surfaces, Fourier transform infrared spectroscopy (ATR-FTIR) provides evidence for a systematic shift of the n a (CH 2 ) stretching vibrations preceding bacterial inactivation within 60 min. The discontinuous IR-peak shifts reflect the increase in the C–H inter-bond distance leading to bond scission. The mechanism leading to E. coli loss of viability on PES–TiO 2 was investigated in the dark up to complete bacterial inactivation by monitoring the damage in the bacterial outer cell by transmission electron microscopy. After 30 min, the critical step during the E. coli inactivation commences for dark disinfection on 0.1–5% wt PES–TiO 2 samples. The interactions between the TiO 2 aggregates and the outer lipopolysaccharide cell wall involve electrostatic effects competing with the van der Waals forces.

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Structure-reactivity relations for DC-magnetron sputtered Cu-layers during E. coli inactivation in the dark and under light

Cited by 10 publications

References 0 publications

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

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

Copper-enriched diamond-like carbon coatings promote regeneration at the bone–implant interface

Effect of surface pretreatment of TiO ₂ films on interfacial processes leading to bacterial inactivation in the dark and under light irradiation

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Structure-reactivity relations for DC-magnetron sputtered Cu-layers during E. coli inactivation in the dark and under light

Cited by 10 publications

References 0 publications

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

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

Copper-enriched diamond-like carbon coatings promote regeneration at the bone–implant interface

Effect of surface pretreatment of TiO 2 films on interfacial processes leading to bacterial inactivation in the dark and under light irradiation

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Effect of surface pretreatment of TiO ₂ films on interfacial processes leading to bacterial inactivation in the dark and under light irradiation