Zirconium Carboxyaminophosphonate Nanosheets as Support for Ag Nanoparticles

Abstract

A layered insoluble inorganic-organic solid, namely zirconium phosphate glycine-N,N-bismethylphosphonate, was used to prepare dispersions of nanosheets to support active metals such as metallic silver nanoparticles and zinc ions. Zr phosphate-phosphonate microcrystals were first exfoliated with methylamine to produce a stable colloidal dispersion and then the methylamine was removed by treatment with hydrochloric acid. The obtained colloidal dispersion of Zr phosphate-phosphonate nanosheets was used to immobilize silver or zinc cations, via ion exchange, with the acidic protons of the sheets. The layered matrix showed a great affinity for the metal cations up taking all the added cations. The treatment of the dispersions containing silver ions with ethanol yielded metal silver nanoparticles grafted on the surface of the layered host. The samples were characterized by X-ray powder diffraction, elemental analysis transmission electron microscopy, and selected samples were submitted to antimicrobial tests. The nanocomposites based on Ag nanoparticles showed good bactericidal properties against the bacterial reference strain Staphylococcus epidermidis (S. epidermidis).

Synthesis, Crystal Structure, and Antibacterial Properties of Silver-Functionalized Low-Dimensional Layered Zirconium Phosphonates

“…Sample 1g revealed a suitable exfoliated support to anchor and stabilize AgNPs, and it showed very good antimicrobial activity. , Here the antimicrobial properties of AgNPs grown on 2g–4g were investigated.…”

“…Highly active PdNPs supported on 1 have shown superior catalytic performance in carbon–carbon bond formation , and hydrogenation reactions. The immobilization of AgNPs or Zn 2+ ions on exfoliated 1 has allowed the preparation of antimicrobial nanosheets. , The aim of this work is the preparation of novel isostructural zirconium phosphate phosphonates (ZPs) based on phosphonic acids, analogous to glyphosine, that can exfoliate under mild conditions. In particular, bis­(phosphonomethyl)­aminocarboxylic acids with increased carbon chain lengths and phosphoric acid have been used in the ZP synthesis.…”

Antibacterial Properties of a Novel Zirconium Phosphate-Glycinediphosphonate Loaded with Either Zinc or Silver

“…The solid was then filtered under vacuum, washed 3 times with deionized water, and dried at 60 °C for 24 h. The procedure for the preparation of colloidal dispersions of ZPGly decorated with silver nanoparticles (Ag@ZPGly) or exchanged with zinc ions (Zn/ZPGly) is reported in ref. [30] and is briefly recalled here.…”

Bioinspired Reactive Interfaces Based on Layered Double Hydroxides-Zn Rich Hydroxyapatite with Antibacterial Activity

“…Pseudomonas aeruginosa (Gram-negative) and Staphylococcus aureus (Gram-positive) bacteria are the most common pathogens associated with orthopedic infections, where the latter has a high tendency to form a biofilm . The modification of the implant surface with thin antibacterial and possibly antibiofilm coating was pursued, and in this context, surfaces releasing antibiotics, metal nanoparticles, − antimicrobial polymers, enzymes, and peptides were investigated . However, another issue has to be taken into consideration in the engineering of the implant surface, that is its ability to favor a rapid overgrowth of host cells in “race for the surface” against microbial colonization .…”