Silver nanoparticles as antimicrobial agent: a case study on E. coli as a model for Gram-negative bacteria

http://users.encs.concordia.ca/~mojtaba/elec6271/silver%20nanoparticles.pdf

Silver nanoparticles: green synthesis and their antimicrobial activities.

A photoinduced method for converting large quantities of silver nanospheres into triangular nanoprisms is reported. The photo-process has been characterized by time-dependent ultraviolet-visible spectroscopy and transmission electron microscopy, allowing for the observation of several key intermediates in and characteristics of the conversion process. This light-driven process results in a colloid with distinctive optical properties that directly relate to the nanoprism shape of the particles. Theoretical calculations coupled with experimental observations allow for the assignment of the nanoprism plasmon bands and for the first identification of two distinct quadrupole plasmon resonances for a nanoparticle. Unlike the spherical particles they are derived from that Rayleigh light-scatter in the blue, these nanoprisms exhibit scattering in the red, which could be useful in developing multicolor diagnostic labels on the basis not only of nanoparticle composition and size but also of shape.

http://science.sciencemag.org/content/sci/294/5548/1901.full.pdf

Photoinduced conversion of silver nanospheres to nanoprisms.

Green synthesis of metal nanoparticles using plants

Rapid synthesis of Au, Ag, and bimetallic Au core-Ag shell nanoparticles using Neem (Azadirachta indica) leaf broth.

One mechanism of silver resistance in microorganisms is accumulation of the metal ions in the cell. Here, we report on the phenomenon of biosynthesis of silver-based single crystals with well-defined compositions and shapes, such as equilateral triangles and hexagons, in Pseudomonas stutzeri AG259. The crystals were up to 200 nm in size and were often located at the cell poles. Transmission electron microscopy, quantitative energy-dispersive x-ray analysis, and electron diffraction established that the crystals comprise at least three different types, found both in whole cells and thin sections. These Ag-containing crystals are embedded in the organic matrix of the bacteria. Their possible potential as organic-metal composites in thin film and surface coating technology is discussed.

https://www.pnas.org/content/pnas/96/24/13611.full.pdf

Silver-based crystalline nanoparticles, microbially fabricated

https://www.oocities.org/gazerwho/Bacteriaasworkersintheliving.pdf

Bacteria as workers in the living factory: metal-accumulating bacteria and their potential for materials science.

Biologically Produced Silver-Carbon Composite Materials for Optically Functional Thin-Film Coatings

Biologically Produced Silver–Carbon Composite Materials for Optically Functional Thin‐Film Coatings

Optical Characterization Of Industrially Sputtered Nickel–Nickel Oxide Solar Selective Surface

Silver-dielectric composite films were produced by a biomimetic technique, using the bacterial strain Pseudomonas stutzeri AG259 as a precursor for sol-gel-type deposition. Heat treated films backed by a metal displayed pronounced spectral selectivity of a kind that makes them interesting for photothermal conversion of solar energy. The optical properties could be reconciled with the Bruggeman effective medium theory.

R Joerger

Papers

Silver-based crystalline nanoparticles, microbially fabricated

Bacteria as workers in the living factory: metal-accumulating bacteria and their potential for materials science.

Biologically Produced Silver–Carbon Composite Materials for Optically Functional Thin‐Film Coatings

Optical Characterization Of Industrially Sputtered Nickel–Nickel Oxide Solar Selective Surface

Spectrally selective solar absorbing surface coatings prepared by a biomimetic technique