Nanosized silver–anionic clay matrix as nanostructured ensembles with antimicrobial activity

Abstract

Nanostructured ensembles of silver nanoparticles/zinc-substituted anionic clay matrix (Ag/ZnLDH) were obtained by a simple synthetic route in which reconstruction of the layered clay, synthesis of the silver nanoparticles and their organisation on the clay surface took place in a single step at room temperature. The morphology, composition and phase structure of the prepared powders were characterised by X-ray diffraction, infrared spectroscopy, transmission electron microscopy, X-ray photoelectron spectroscopy and N 2 adsorption. Results showed that the silver-anionic clay nanoarchitecture consists of nanoparticles of silver (average size 7 nm) deposited on the larger nanoparticles of clay (average size 85 nm). The antimicrobial activity was examined by disk diffusion assay and minimal inhibitory concentration determination as a function of x, where x is a controlled variable parameter that represents the length of time since the sample was synthesised. Ag/ZnLDH showed more stable antimicrobial properties than the unsupported nanosized silver.

Tailoring assemblies of plasmonic silver/gold and zinc–gallium layered double hydroxides for photocatalytic conversion of carbon dioxide using UV–visible light

“…TiO 2 , exceeding the Schottky barrier, has been reported [17][18][19][20] A c c e p t e d M a n u s c r i p t 7 introduced into the aqueous solutions of silver or gold salts [21,22]. In this work, assemblies procedure from metal nitrates, Na 2 CO 3 , and NaOH in aqueous solutions controlled at pH 8 [10].…”

Inorganic nanolayers: structure, preparation, and biomedical applications

“…147 They evaluated the antimicrobial effect of AgNPs alone and hybrid AgNP LDHs with respect to time, and found that AgNP LDHs retained the inhibition zone against the Gram-positive S. aureus (American Type Culture Collection [ATCC] 25923) and the Gram-negative E. coli (ATCC 35218). However, the AgNP zone of inhibition was found to almost disappear with time.…”

“…However, the AgNP zone of inhibition was found to almost disappear with time. 147 Titanium-based layered double hydroxides with antimicrobial properties Zhao et al designed nanoscale material with photocatalytic activity. 141 They developed Zn-Ti LDH nanosheets in the size range of 40-80 nm with a band gap of about 2.3 eV.…”

Nanoparticles of copper oxide on layered double hydroxides and the derived solid solutions as wide spectrum active nano-photocatalysts

“…The hydrotalcite-lik e clay and zinc substituted hydrotalcite-lik e clay, denoted as MgLDH and ZnLDH were obtained by the coprecipitation method following the procedure described elsewhere [13,17]. After calcinatio n at 750 °C, for 8 h, these samples were denoted as MgLDH750 and ZnLDH750, respectively.…”