Photocatalytically Deposited Silver Nanoparticles on Mesoporous TiO<sub>2</sub> Films

Σταθάτος, Ηλίας; Lianos, Panagiotis; Falaras, P.; Siokou, A.

doi:10.1021/la981783t

Cited by 270 publications

(148 citation statements)

References 10 publications

(23 reference statements)

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“…In order to address this problem, many studies was recently performed to enhance photocatalytic efficiency and white light utilization of TiO2 including using impurity dope and metallization [36][37][38] . Previous studies showed that incorporation of vanadium or silver and bromine extended photocatalytic range of TiO2 from the ultraviolet to the visible region and they showed enhanced antimicrobial activities on bacteria under white light condition 39,40 .…”

Section: Introductionmentioning

confidence: 99%

White Light-Activated Antimicrobial Paint using Crystal Violet

Hwang

Allan

Parkin

2015

ACS Appl. Mater. Interfaces

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Crystal violet (CV) was incorporated into acrylic latex to produce white light activated antimicrobial paint (WLAAP). Measurement of the water contact angle of the WLAAP showed that the water contact angle increased with increasing CV concentration. In a leaching test over 120 h, the amount of CV which leached from the WLAAPs was close to the detection limit (<0.03 %). The WLAAPs were used to coat samples of polyurethane and these showed bactericidal activity against E. coli which is a key causative agent of healthcare-associated infections (HAIs). A reduction in the numbers of viable bacteria was observed on the painted coated polyurethane after 6 h in the dark and the bactericidal activity increased with increasing CV concentration (P <0.1). After 6 h of white light exposure, all of coated polyurethanes demonstrated a potent photobactericidal activity and it was statistically confirmed that the WLAAP showed better activity in white light than in the dark (P <0.05). At the highest CV concentration, the numbers of viable bacteria fell below the detection limit (<10 3 CFU/mL) after 6h of white light exposure. The difference in antimicrobial activity between the materials in the light and dark was 0.48 log at CV 250 ppm and it increased by 0.43 log at each increment of CV 250 ppm. The difference was the highest (>1.8 log) at the highest CV concentration (1000 ppm).These WLAAPs are promising candidates for use in healthcare facilities to reduceHAIs.

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Section: Introductionmentioning

confidence: 99%

White Light-Activated Antimicrobial Paint using Crystal Violet

Hwang

Allan

Parkin

2015

ACS Appl. Mater. Interfaces

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“…[1][2][3][4][5] Recently, different inorganic antibacterial materials, including AgNPs, have been expanded and some are in commercial use. 6 The antibacterial activity of AgNPscontaining materials can be used, for example, in medicines to treat infections in human skin, 7,8 dental materials, 9 catheters, 10,11 vascular grafts, 12 stainless steel materials, 13 arthroplasty, 14 and burn treatment, 15,16 as well as to prevent microorganism colonization on prostheses.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of silver/montmorillonite/chitosan bionanocomposites by chemical reduction method and their antibacterial activity

Shameli¹,

Ahmad²,

Zargar³

et al. 2011

IJN

136

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Silver nanoparticles (AgNPs) of a small size were successfully synthesized using the wet chemical reduction method into the lamellar space layer of montmorillonite/chitosan (MMT/Cts) as an organomodified mineral solid support in the absence of any heat treatment. AgNO3, MMT, Cts, and NaBH4 were used as the silver precursor, the solid support, the natural polymeric stabilizer, and the chemical reduction agent, respectively. MMT was suspended in aqueous AgNO3/Cts solution. The interlamellar space limits were changed (d-spacing = 1.24–1.54 nm); therefore, AgNPs formed on the interlayer and external surface of MMT/Cts with d-average = 6.28–9.84 nm diameter. Characterizations were done using different methods, ie, ultraviolet-visible spectroscopy, powder X-ray diffraction, transmission electron microscopy, scanning electron microscopy, energy dispersive X-ray fluorescence spectrometry, and Fourier transform infrared spectroscopy. Silver/montmorillonite/chitosan bionanocomposite (Ag/MMT/Cts BNC) systems were examined. The antibacterial activity of AgNPs in MMT/Cts was investigated against Gram-positive bacteria, ie, Staphylococcus aureus and methicillin-resistant S. aureus and Gram-negative bacteria, ie, Escherichia coli , E. coli O157:H7, and Pseudomonas aeruginosa by the disc diffusion method using Mueller Hinton agar at different sizes of AgNPs. All of the synthesized Ag/MMT/Cts BNCs were found to have high antibacterial activity. These results show that Ag/MMT/Cts BNCs can be useful in different biological research and biomedical applications, including surgical devices and drug delivery vehicles.

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“…Compared to the spectrum of a bare film (Figure 10(a)), spectra of Figure 10(b) and (c) depict a large band centred at around 515 nm and extending over a wide spectral range. Location and shape of this band closely corresponds to the plasmon band of metal silver nanoparticles dispersed at a solid surface [55,[63][64][65][66][67]. Figure 10(b) and (c) also shows that, for the same immersion durations, the plasmon band intensity increases when increasing the SN concentration in solution.…”

Section: Extrapolation To Gold Nanoparticles Through a 2-step Aip Promentioning

confidence: 66%

Synthesis and functionalities of noble metal nanoparticles formed through simple all-inorganic photochemical procedures

Riassetto¹,

Roussel²,

Rapenne³

et al. 2010

Journal of Experimental Nanoscience

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The photochemical reduction of metal precursors under UV light has been studied to produce noble metal nanoparticles. Depending on the metal (Pt, Au or Ag) and precursor (chlorinated or nitrate) natures, different 1-step or 2-step photolytic or photocatalytic reduction mechanisms have been investigated. These mechanisms yield simple all-inorganic methods to generate metal nanoparticles in liquid medium and disperse these particles at the surface of various kinds of supports. Depending on the metal particle and support natures, different functionalities can arise from such easy and low-cost photometallisation methods.

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Photocatalytically Deposited Silver Nanoparticles on Mesoporous TiO₂ Films

Cited by 270 publications

References 10 publications

White Light-Activated Antimicrobial Paint using Crystal Violet

White Light-Activated Antimicrobial Paint using Crystal Violet

Synthesis and characterization of silver/montmorillonite/chitosan bionanocomposites by chemical reduction method and their antibacterial activity

Synthesis and functionalities of noble metal nanoparticles formed through simple all-inorganic photochemical procedures

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Photocatalytically Deposited Silver Nanoparticles on Mesoporous TiO2 Films

Cited by 270 publications

References 10 publications

White Light-Activated Antimicrobial Paint using Crystal Violet

White Light-Activated Antimicrobial Paint using Crystal Violet

Synthesis and characterization of silver/montmorillonite/chitosan bionanocomposites by chemical reduction method and their antibacterial activity

Synthesis and functionalities of noble metal nanoparticles formed through simple all-inorganic photochemical procedures

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Photocatalytically Deposited Silver Nanoparticles on Mesoporous TiO₂ Films