Self-cleaning fibers via nanotechnology: a virtual reality

a b s t r a c tThis study reports visible light sensitive ZrNO and ZrNO-Ag polyester samples prepared by sputtering in an Ar/N 2 /O 2 atmosphere leading to Escherichia coli bacterial inactivation. The bacterial inactivation by ZrNO avoids the increasing environmental concern involving the fate of Ag-leaching of many disinfectants. The simultaneous co-sputtering of ZrNO and Ag 2 O enhanced the E. coli bacterial inactivation kinetics compared to the sequential sputtering of ZrNO and Ag. A reaction mechanism is suggested triggered by photoinduced interfacial charge transfer (IFCT) suggesting electron injection form the Ag 2 O cb to the ZrO 2cb . The sizes of the ZrO 2 and Ag nanoparticles in the co-sputtered ZrNO-Ag were 80-130 nm and 8-15 nm respectively as determined by high angular annular dark field (HAADF) microscopy. Evidence is presented by X-ray photoelectron spectroscopy (XPS) for the self-cleaning of the photocatalysts after bacterial inactivation. This enabled a stable catalyst reuse. The XPS experimental spectra of ZrNO and ZrNO-Ag were deconvoluted into their ZrN, ZrNO and ZrO 2 components. The amounts of Ag-ions released during bacterial inactivation were < 5 ppb/cm 2 and well below the Ag cytotoxic levels. Since no cytotoxicity was introduced during the bacterial inactivation process, the ZrNO-Ag disinfection proceeds through an oligodynamic effect.

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“…Doping decreases considerably the photo-activity of the films compared to pristine TiO 2 [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

“…Antimicrobial Ag-nanoparticles (NPs) have sputtered [9,18,28,29] on different textiles due to the known disinfecting properties of Ag. Ag is also used in healing wound-pads [4][5][6], and implants [1].…”

Section: Introductionmentioning

confidence: 99%

ZrNO–Ag co-sputtered surfaces leading to E. coli inactivation under actinic light: Evidence for the oligodynamic effect

Rtimi

Pascu

Sanjinés

et al. 2013

Applied Catalysis B: Environmental

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“…Photocatalysis as a useful tool for the self-cleaning of glass, polymer thin films and textile fabric surfaces has recently been reported by Daoud [1][2][3][4], Kiwi [5][6][7][8], Hashimoto/Fujishima et al [9,10], Bahnemann [11][12][13], Radetic [14] and Pakkanen [15]. TiO 2 has been chosen as the standard photocatalyst used in the field of environmental photochemistry due to its stability, effective separation of charges under band-gap irradiation and availability of fairly pure samples.…”

Section: Introductionmentioning

confidence: 99%

Accelerated self-cleaning by Cu promoted semiconductor binary-oxides under low intensity sunlight irradiation

Rtimi

Pulgarín

Sanjinés

2016

Applied Catalysis B: Environmental

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a b s t r a c tUniform adhesive TiO 2 -ZrO 2 films co-sputtered on polyester (PES) under low intensity sunlight irradiation discolored methylene blue (MB) within 120 min. The discoloration kinetics was seen to be accelerated by a factor four by TiO 2 -ZrO 2 -Cu containing ∼0.01% Cu, as determined by X-ray fluorescence (XRF). TiO 2 -ZrO 2 -Cu also increased also accelerated by a factor the discoloration of MB compared to TiO 2 /Cu(PES). MB discoloration was also monitored under visible light in the solar cavity by using a 400 nm cutoff filter. Photocatalyst surfaces were characterized by spectroscopic methods showing the film optical absorption and by X-ray photoelectron spectroscopy (XPS), the surface atomic percentage concentration up to 120 nm (∼600 layers). The band-gaps of TiO 2 -ZrO 2 and TiO 2 -ZrO 2 -Cu were estimated for films co-sputtered for different times. By Fourier transform attenuated infrared spectroscopy (ATR-FTIR), the systematic shift of the predominating s (CH 2 ) vibration-rotational MB bands was monitored up to complete MB discoloration under low intensity solar simulated light. Evidence is presented for the OH • generation by TiO 2 -ZrO 2 -Cu participating in the self-cleaning mechanism. The photo-induced interfacial charge transfer (IFCT) on the TiO 2 -ZrO 2 -Cu is discussed in terms of the electronic band positions of the binary oxides and Cu intra-gap states. This study presents the first evidence for a Cu-promoted composed of two binary oxide semiconductors accelerating the self-cleaning performance.

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“…Titanium dioxide (TiO 2 ) antibacterial surfaces are growing continuously in importance in the area of antibacterial, medical and health care applications [1][2][3][4][5]. TiO 2 disinfection does not lead to bacterial resistance and prevents the formation of harmful biofilms under very low doses of sunlight irradiation.…”

Section: Introductionmentioning

confidence: 99%

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

Bonnefond

González

Asúa

et al. 2015

Colloids and Surfaces B: Biointerfaces

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a b s t r a c tThis study addresses the preparation and characterization of hybrid films prepared from Titanium dioxide (TiO 2 ) Pickering stabilized acrylic polymeric dispersion as well as their bacterial inactivation efficiency under sunlight irradiation. Complete bacterial inactivation under low intensity simulated solar light irradiation (55 mW/cm 2 ) was observed within 240 min for the films containing 10 weight based on monomers (wbm) % of TiO 2 , whereas 360 min were needed for the films containing 20 wbm% of TiO 2. The hybrid films showed repetitive Escherichia coli (E. coli) inactivation under light irradiation. TiO 2 released from the films surfaces was measured by inductively coupled plasma mass spectrometry (IPC-MS), obtaining values of ∼0.5 and 1 ppb/cm 2 for the films containing 10 wbm% and 20 wbm% of TiO 2 , respectively, far below the allowed cytotoxicity level for TiO 2 (200 ppb). Transmission electron microscopy (TEM) of the hybrid films showed that TiO 2 nanoparticles (NPs) were located at the polymer particle's surface forming a continuous inorganic network inside the film matrix. Atomic force microscopy (AFM) images showed differences in the TiO 2 dispersion between the air-film and film-substrate interfaces. Films containing 10 wbm% of TiO 2 had higher roughness (Rg) at both interfaces than the one containing 20 wbm% of TiO 2 inducing an increase in the bacterial adhesion as well as the bacterial inactivation kinetics. The highly oxidative OH• -radicals participating in the bacterial inactivation were determined by fluorescence.

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Self-cleaning fibers via nanotechnology: a virtual reality

Cited by 164 publications

References 75 publications

ZrNO–Ag co-sputtered surfaces leading to E. coli inactivation under actinic light: Evidence for the oligodynamic effect

ZrNO–Ag co-sputtered surfaces leading to E. coli inactivation under actinic light: Evidence for the oligodynamic effect

Accelerated self-cleaning by Cu promoted semiconductor binary-oxides under low intensity sunlight irradiation

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

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