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

Gabriela Carja (1) , Yoshikazu Kameshima (2) , Akira Nakajima (2) , Cristian Dranca (1) , Kiyoshi Okada (3)

1 Faculty of Chemical Engineering and Environment Protection
2 Department of Metallurgy and Ceramics Science
3 TITECH - Tokyo Institute of Technology [Tokyo]

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 adsorption. Results showed that the silver–anionic clay nanoarchitecture consists of nanoparticles of silver (average size 7nm) deposited on the larger nanoparticles of clay (average size 85nm). The antimicrobial activity was examined by disk diffusion assay and minimal inhibitory concentration determination as a function of , where 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.

Mots clés: Silver nanoparticles; LDH anionic clay; Antimicrobial properties; Nanostructured ensembles

Gabriela Carja, Yoshikazu Kameshima, Akira Nakajima, Cristian Dranca, Kiyoshi Okada. Nanosized silver–anionic clay matrix as nanostructured ensembles with antimicrobial activity. International Journal of Antimicrobial Agents, 2009, 34 (6), pp.534. ⟨10.1016/j.ijantimicag.2009.08.008⟩. ⟨hal-00556361⟩