XANES studies of the formation of Ag-nanoparticles in LbL deposited polyelectrolyte thin films

Itani, H.; Keil, P.; Lützenkirchen‐Hecht, Dirk; Haake, U.; Bongard, Hans‐Josef; Dreier, Axel; Lehmann, Christian W.; Grundmeier, Guido

doi:10.1016/j.surfcoat.2010.08.104

Cited by 7 publications

(5 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Ag 3d 5/2 component was deconvoluted in a peak at 368.3 eV (corresponding to Ag 0 ) and in another peak at 370 eV, suggesting the presence of oxidized Ag that was interacting with the nylon surface . Many studies indicate a negative shift in the binding energy of the Ag 3d peaks when the silver oxidation state is increased. , However, this is not the case. When silver nanoparticles or silver ions chemically interact with polymer moiety, a positive shift in binding energy with the increase in the oxidation state is usually observed, and peaks between 368.6 and 370 eV are attributed to polymer–AgO/Ag + ions complexes. ,, The deconvoluted C 1s, O 1s, and N 1s spectra of the plasma-treated samples after 30 days of aging returns to the same energy binding values of the untreated PA66.…”

Section: Resultsmentioning

confidence: 99%

“…35 Many studies indicate a negative shift in the binding energy of the Ag 3d peaks when the silver oxidation state is increased. 36,37 However, this is not the case. When silver nanoparticles or silver ions chemically interact with polymer moiety, a positive shift in binding energy with the increase in the oxidation state is usually observed, and peaks between 368.6 and 370 eV are attributed to polymer−AgO/Ag + ions complexes.…”

Section: Deconvolution Analysis Of Xps Spectra At Day 30mentioning

confidence: 99%

See 1 more Smart Citation

Size and Aging Effects on Antimicrobial Efficiency of Silver Nanoparticles Coated on Polyamide Fabrics Activated by Atmospheric DBD Plasma

Zille

Fernandes

Francesko

et al. 2015

ACS Appl. Mater. Interfaces

114

View full text Add to dashboard Cite

This work studies the surface characteristics, antimicrobial activity, and aging effect of plasma-pretreated polyamide 6,6 (PA66) fabrics coated with silver nanoparticles (AgNPs), aiming to identify the optimum size of nanosilver exhibiting antibacterial properties suitable for the manufacture of hospital textiles. The release of bactericidal Ag(+) ions from a 10, 20, 40, 60, and 100 nm AgNPs-coated PA66 surface was a function of the particles' size, number, and aging. Plasma pretreatment promoted both ionic and covalent interactions between AgNPs and the formed oxygen species on the fibers, favoring the deposition of smaller-diameter AgNPs that consequently showed better immediate and durable antimicrobial effects against Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus bacteria. Surprisingly, after 30 days of aging, a comparable bacterial growth inhibition was achieved for all of the fibers treated with AgNPs <100 nm in size. The Ag(+) in the coatings also favored the electrostatic stabilization of the plasma-induced functional groups on the PA66 surface, thereby retarding the aging process. At the same time, the size-related ratio (Ag(+)/Ag(0)) of the AgNPs between 40 and 60 nm allowed for the controlled release of Ag(+) rather than bulk silver. Overall, the results suggest that instead of reducing the size of the AgNPs, which is associated with higher toxicity, similar long-term effects can be achieved with larger NPs (40-60 nm), even in lower concentrations. Because the antimicrobial efficiency of AgNPs larger than 30 nm is mainly ruled by the release of Ag(+) over time and not by the size and number of the AgNPs, this parameter is crucial for the development of efficient antimicrobial coatings on plasma-treated surfaces and contributes to the safety and durability of clothing used in clinical settings.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Deconvolution Analysis Of Xps Spectra At Day 30mentioning

confidence: 99%

Size and Aging Effects on Antimicrobial Efficiency of Silver Nanoparticles Coated on Polyamide Fabrics Activated by Atmospheric DBD Plasma

Zille

Fernandes

Francesko

et al. 2015

ACS Appl. Mater. Interfaces

114

View full text Add to dashboard Cite

show abstract

“…As shown in Figure , the characteristic absorption peaks (carbonyl absorption peak at 1587.1 cm −1 and quaternary ammonium ion absorption peak at 1477.2 cm −1 ) of the polyelectrolyte after self‐assembly still existed. This showed that the (TLQA/CMPVA) 5 multilayer film was assembled successfully via electrostatic forces with TLQA and CMPVA …”

Section: Resultsmentioning

confidence: 90%

Layer‐by‐layer self‐assembly of a lignin–poly(vinyl alcohol) based polyelectrolyte with a conductivity method

Zhang

Jiang

et al. 2016

J of Applied Polymer Sci

View full text Add to dashboard Cite

In this study, we made a new attempt to examine the relationship between the conductivity and the concentration of a polyelectrolyte solution and to prepare multilayer films with cationic lignin and polyanions through layer-by-layer self-assembly. The nitrogen content of trimethyl lignin quaternary amine salt (TLQA) was 3.56%, and the carboxyl content of carboxymethylated poly (vinyl alcohol) (CMPVA) was 0.62 mmol/g. Attenuated total reflectance spectra confirmed that TLQA and CMPVA were fabricated and assembled successfully. The concentration of TLQA had a polynomial correlation with the conductivity [correlation coefficient (R 2 ) 5 0.9953], and the concentration of CMPVA was linear with the conductivity (R 2 5 0.9819). The electrostatic sequential adsorption process was monitored with a UV-visible spectrophotometer, and the morphology of the (TLQA/CMPVA) n (where n is the number of double membranes) multilayer film was observed by atomic force microscopy and scanning electron microscopy. When the absorbance of the (TLQA/CMPVA) n multilayer film increased linearly, the linear equation was y 5 0.0267x 1 0.07453 and R 2 was 0.9735. When five layers of TLQA and CMPVA were assembled, the surface root mean square roughness of TLQA and CMPVA were 21.07 and 65.28 nm, respectively. When the number of layers increased, the film surface roughness increased. The stability of the multilayer films in aqueous solution was determined by a conductivity meter. The (TLQA/CMPVA) n multilayer film was stable in water. The results of the research demonstrate for the first time that TLQA and CMPVA could be assembled and successfully driven by electrostatic forces.

show abstract

“…The AgNPs deposited on the plasma-treated PA66 fabric showed a negative shift in binding energy for Ag3d 5/2 (367.8 eV) relative to the bulk Ag (368.3 eV), indicating the presence of Ag + on the surface of the nanoparticles. Several studies correlate a negative shift in the binding energy of Ag3d peaks to an increase in the oxidation state of silver [41,42]. The presence of a negative shift in the Ag component, in combination with the increased binding energy of the double-bond oxygen species in the O1s deconvoluted spectra of the plasma-treated samples, indicates an interaction between the Ag + and plasma-generated oxygen species on the fabric surface [43].…”

Section: Discussionmentioning

confidence: 99%

Antimicrobial Efficacy of Low Concentration PVP-Silver Nanoparticles Deposited on DBD Plasma-Treated Polyamide 6,6 Fabric

et al. 2019

View full text Add to dashboard Cite

In this study, a low concentration (10 μg·mL−1) of poly(N-vinylpyrrolidone) (PVP)-coated silver nanoparticles (AgNPs) were deposited by spray and exhaustion (30, 70 and 100 °C) methods onto untreated and dielectric barrier discharge (DBD) plasma-treated polyamide 6,6 (PA66) fabric. DBD plasma-treated samples showed higher AgNP deposition than untreated ones for all methods. After five washing cycles, only DBD plasma-treated samples displayed AgNPs on the fabric surface. The best-performing method was exhaustion at 30 °C, which exhibited less agglomeration and the best antibacterial efficacy against S. aureus (4 log reduction). For E. coli, the antimicrobial effect showed good results in all the exhaustion samples (5 log reduction). Considering the spray method, only the DBD plasma-treated samples showed some bacteriostatic activity for both strains, but the AgNP concentration was not enough to have a bactericidal effect. Our results suggest DBD plasma may be a low cost and chemical-free method for the preparation of antibacterial textiles, allowing for the immobilization of a very low—but effective—concentration of AgNPs.

show abstract

XANES studies of the formation of Ag-nanoparticles in LbL deposited polyelectrolyte thin films

Cited by 7 publications

References 39 publications

Size and Aging Effects on Antimicrobial Efficiency of Silver Nanoparticles Coated on Polyamide Fabrics Activated by Atmospheric DBD Plasma

Size and Aging Effects on Antimicrobial Efficiency of Silver Nanoparticles Coated on Polyamide Fabrics Activated by Atmospheric DBD Plasma

Layer‐by‐layer self‐assembly of a lignin–poly(vinyl alcohol) based polyelectrolyte with a conductivity method

Antimicrobial Efficacy of Low Concentration PVP-Silver Nanoparticles Deposited on DBD Plasma-Treated Polyamide 6,6 Fabric

Contact Info

Product

Resources

About