Preparation of highly concentrated stable dispersions of uniform silver nanoparticles

Sondi, Ivan; Goia, Dan V.; Matijević, Egon

doi:10.1016/s0021-9797(02)00205-9

Cited by 403 publications

(264 citation statements)

References 18 publications

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“…UV-visible spectra of silver colloids prepared from the thermal treatment of silver oxalate yields the surface plasmon bands in the range of 409-427 nm [13]. These are shown in Fig.…”

Section: Resultsmentioning

confidence: 93%

Thermal decomposition as route for silver nanoparticles

et al. 2006

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Single crystalline silver nanoparticles have been synthesized by thermal decomposition of silver oxalate in water and in ethylene glycol. Polyvinyl alcohol (PVA) was employed as a capping agent. The particles were spherical in shape with size below 10 nm. The chemical reduction of silver oxalate by PVA was also observed. Increase of the polymer concentration led to a decrease in the size of Ag particles. Ag nanoparticle was not formed in the absence of PVA. Antibacterial activity of the Ag colloid was studied by disc diffusion method.

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“…UV-visible spectra of silver colloids prepared from the thermal treatment of silver oxalate yields the surface plasmon bands in the range of 409-427 nm [13]. These are shown in Fig.…”

Section: Resultsmentioning

confidence: 93%

Thermal decomposition as route for silver nanoparticles

et al. 2006

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“…In addition particle purity and coatings (where applicable) were confirmed using UV-Visible absorption spectroscopy [5], X-ray diffraction spectroscopy (XRD) [4], and atomic absorption spectroscopy (AAS) [13]. Colloidal stability was assessed using zeta potential analysis [27]. For the purpose of clarity for this paper only details of methods pertaining to particle size distribution and were appropriate purity or concentration will be presented and discussed.…”

Section: Nanoparticle Characterisationmentioning

confidence: 99%

Antimicrobial properties of nano-silver: A cautionary approach to ionic interference

Sheehy¹,

Casey²,

Murphy³

et al. 2015

Journal of Colloid and Interface Science

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a b s t r a c tHypothesis: Metallic nanoparticles such as nano-silver have found many applications as alternative antimicrobials in recent years. However methods for determining their proposed antimicrobial activity have received little attention to date. The disk diffusion assay is commonly used as a demonstration of antimicrobial properties and is a regular feature in synthetic nanoparticle papers. The aim of this study was to assess its effectiveness in demonstrating the ''nanoparticle specific'' antimicrobial properties in the absence of ionic contributions from unreacted reducing agents and or impurities. Experiments: The disk diffusion assay was carried out on a range of silver nanoparticles, both in-house synthesised and commercially available, using Escherichia coli ATCC 25922 as a model organism. Results: Capped and purified nanoparticles show no antimicrobial activity despite claims to the contrary for this assay. Results will be discussed in terms of the need for researchers without a background in microbiology to understand the mechanism of antimicrobial action before choosing an assay. Also discussed is the importance understanding the physiochemical characteristics of when interpreting results. Finally the relevance of the results in terms establishing protocols for method development for 'nanoparticle specific' antimicrobial properties will also be considered.

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“…chemical [10][11][12][13], electrochemical [14] and photochemical reduction [15], ultrasound [16], microwave [17] gamma and electron irradiation [18][19][20][21][22][23][24]) for the synthesis of silver nanoparticles with different stabilisers have been developed.…”

Section: Introductionmentioning

confidence: 99%

“…A method using ionising radiation (gamma and electron) provides several advantages compared to other methods [13][14][15][16][17], such as: (1) the process is carried out at room temperature; (2) reducing agents fairly uniformly occur in the irradiated solution; (3) the reaction rate can be reliably controlled by varying irradiation time; (4) colloidal silver nanoparticles can be purely prepared without contamination of excessive reductant and silver ion residue; (5) the size of the particles is easily controlled by varying silver ion concentration; (6) mass production can be carried out at a comparatively reasonable cost.…”

Section: Introductionmentioning

confidence: 99%

Preparation of colloidal silver nanoparticles in poly(N-vinylpyrrolidone) by γ-irradiation

Du¹,

Phú

Duy

et al. 2008

Journal of Experimental Nanoscience

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Colloidal silver nanoparticles were prepared by -irradiating Ag þ in aqueous solution in the presence of 2% polyvinyl pyrrolidone (PVP) as stabilising agent and ethyl alcohol as free radical (OH . ) scavenger. The saturated conversion dose of Ag þ into Ag was determined by UV-Vis spectroscopy and the silver nanoparticles size was characterised by transmission electron microscopy. The influence of Ag þ concentration (1-50 mM) on the saturated conversion dose and average diameter of silver nanoparticles was investigated. Results showed that the saturated conversion dose was from 8 to 48 kGy and the silver particles size was in the range of 6-21 nm for Ag þ concentration from 1 to 50 mM. The effect of PVP molecular weight on silver particles size was studied as well.

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Preparation of highly concentrated stable dispersions of uniform silver nanoparticles

Cited by 403 publications

References 18 publications

Thermal decomposition as route for silver nanoparticles

Thermal decomposition as route for silver nanoparticles

Antimicrobial properties of nano-silver: A cautionary approach to ionic interference

Preparation of colloidal silver nanoparticles in poly(N-vinylpyrrolidone) by γ-irradiation

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