Silver and-or copper vermiculites and their antibacterial effect

Hundáková, Marianna

doi:10.13168/agg.2013.0009

Cited by 13 publications

(7 citation statements)

References 35 publications

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“…Their porous structures comprise silicate layers organized in a 1 to 2 conformation (one aluminum octahedral sheet is sandwiched between two silicate tetrahedral ones). Such conformation leads to the formation of interlayer gaps, which mainly include cations to counterbalance the negative charge of the siloxamic cavities of vermiculite surfaces [16,17]. Electrostatically interacting metal ions at planar sites (outer-sphere complexes) can be efficiently exchanged.…”

Section: Introductionmentioning

confidence: 99%

“…Electrostatically interacting metal ions at planar sites (outer-sphere complexes) can be efficiently exchanged. For instance, it was reported that silver ions exchange with Na + ions [17] and, remarkably, can exist on the vermiculite surfaces both in the Ag + and Ag 0 forms [4,5]. Thus, vermiculite has the potential to be used as a low-cost template for the fabrication of complex silver substrates.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of Hybrid Silver Microstructures from Vermiculite Templates as SERS Substrates

2020

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There is great interest in developing complex, 3D plasmonic materials with unusual structural properties. This can be achieved via template-assisted approaches exploiting scaffold elements to engineer unique plasmonic substrates, which would be otherwise impossible to synthesize. Herein, we present a novel, simple, and low-cost template-assisted method for producing interconnected 3-D silver microstructures by utilizing vermiculite, a well-known silicate, as both in-situ reductant and template for silver growth. The silicate network of the vermiculite can be easily removed by dissolution with hydrofluoric acid, which, simultaneously, leads to the formation of a magnesium fluoride skeleton supporting a plasmonically active silver film. Optical, morphological, and chemical properties of the materials were extensively investigated, revealing, for example, that hybrid silver microstructures can be exploited as valuable SERS substrates over a broad spectral range of excitation wavelengths.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fabrication of Hybrid Silver Microstructures from Vermiculite Templates as SERS Substrates

2020

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“…Fusion of metallic nanoparticles in the structure of aluminosilicates is a relatively new approach in the synthesis of nanoparticles, few reports have been presented thus far on this topic. Hundakova presented the synthesis of silver and copper vermiculites and tested their antibacterial effects against the two bacterial groups [31]. The method still follows the wet chemical process but vermiculite is used to stabilize the nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Facile Method for the Synthesis of Copper Nanoparticles Supported on the Organoclay Material

Bambo¹,

Krause²,

Moutloali³

2017

JBNB

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In this study, synthesis of copper nanoparticles was performed using organoclay as a support to stabilize the nanoparticles. Organoclay amount was gradually increased, which had an effect on the morphology of the resultant nanoparticles. Low amount of organoclay added resulted in larger and agglomerated copper nanoparticles whereas increased amount of organoclay gave smaller sized nanoparticles. The hybrid materials were characterized using the SEM and TEM for morphology, XRD and FT-IR spectroscopy for structural elucidation, thermal analysis using TGA and also studying their antibacterial effect on the two well-known gram negative bacteria of E. coli and P. Aeruginosa. The synthesized nanoparticles were found to be crystalline Cu nanoparticles with a mix of CuO. Larger sized copper nanoparticles and agglomerates showed the higher thermal behaviour as compared with smaller nanoparticles with higher organoclay loading. The hybrid showed an improved antibacterial activity as compared with organoclay alone. The hybrid showed the higher antibacterial effect against the P. aeruginosa microorganism as compared with the E. coli microorganism.

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“…Due to structural properties the clay minerals are suitable substrates for various inorganic and/or organic constituents. Vermiculite is occasionally used as silver or copper particles support [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Vermiculite With Ag and Cu Used as an Antibacterial Nanofiller in Polyethylene/ Vermikulit S Ag A Cu Použitý Jako Antibakteriální Nanoplnivo V Polyethylenu

Hundáková¹,

Valášková²,

Samlíková³

et al. 2014

GeoScience Engineering

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Vermiculite (Ver) enriched with silver and copper was used as nanofiller to the polyethylene (PE) matrix. Specifically, the low density polyethylene (LDPE) was chosen as a matrix. The samples Ver-Ag,Cu were prepared by shaking of Ver with the aqueous solutions of silver and copper nitrate. The mixtures of the Ver nanofillers and PE were homogenized by melt compounding technique and further thin plates were pressed from stiff matter of PE with Ver nanofiller. The exfoliation of the powdery Ver nanofillers in PE matrix was characterized by the X-ray diffraction analysis of thin plates. Distribution of Ver nanofiller in PE matrix was observed by Light microscopy. The reinforcing effect of nanofillers onto PE matrix was studied by creep experiment. Antibacterial activity of powder Ver-Ag,Cu samples and surfaces of PE/Ver-Ag,Cu samples was tested on the Gram-positive bacteria Enterococcus faecalis. All tested PE/Ver-Ag,Cu surfaces showed good antibacterial behaviour after 24 h in comparison to pure PE. The number of colonies decreased from the countless number to several hundred colonies.

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Silver and-or copper vermiculites and their antibacterial effect

Cited by 13 publications

References 35 publications

Fabrication of Hybrid Silver Microstructures from Vermiculite Templates as SERS Substrates

Fabrication of Hybrid Silver Microstructures from Vermiculite Templates as SERS Substrates

Facile Method for the Synthesis of Copper Nanoparticles Supported on the Organoclay Material

Vermiculite With Ag and Cu Used as an Antibacterial Nanofiller in Polyethylene/ Vermikulit S Ag A Cu Použitý Jako Antibakteriální Nanoplnivo V Polyethylenu

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