Latest Research on Silver Nanoparticles Research: Sep – 2019

Shape-Controlled Synthesis of Gold and Silver Nanoparticles

Monodisperse samples of silver nanocubes were synthesized in giant quantities by reducing nitrate with ethanediol within the presence of poly(vinyl pyrrolidone) (PVP). These cubes were single crystals and were characterised by a rather truncated form delimited by , , and  aspects. The presence of PVP and its molar magnitude relation (in terms of continuance unit) relative to nitrate each vie necessary roles in decisive the geometric form and size of the merchandise. The silver cubes may function kill templates to come up with single-crystalline nanoboxes of gold: hollow polyhedra delimited by six  and eight  aspects. dominant the dimensions, shape, and structure of metal nanoparticles is technologically necessary as a result of the sturdy correlation between these parameters and optical, electrical, and chemical action properties. [1]

The bactericidal effect of silver nanoparticles

Nanotechnology is anticipated to open new avenues to fight and forestall malady victimisation atomic scale craft of materials. Among the foremost promising nanomaterials with antibacterial drug properties are metallic  nanoparticles, that exhibit magnified chemical activity thanks to their massive surface to volume ratios and crystallographic surface structure. The study of disinfectant nanomaterials is especially timely considering the recent increase of recent resistant strains of bacterium to the foremost potent antibiotics. This has promoted analysis within the documented activity of silver ions and silver-based compounds, together with silver nanoparticles. the current work studies the result of silver nanoparticles within the vary of 1–100 nm on gram-negative bacterium victimisation high angle annulate dark field (HAADF) scanning transmission microscopy (STEM). [2]

Electromagnetic fields around silver nanoparticles and dimers

We use the distinct dipole approximation to research the magnetic attraction fields elicited by optical excitation of localized surface plasmon resonances of silver nanoparticles, as well as monomers and dimers, with stress on what size, shape, and arrangement results in the most important native force field (E-field) improvement close to the particle surfaces. The results ar accustomed verify what conditions ar most favorable for manufacturing enhancements massive enough to look at single molecule surface increased Raman spectrographic analysis. Most of the calculations ask triangular prisms, that exhibit distinct dipole and quadrupole resonances that may simply be controlled by variable particle size. additionally, for the chemical compound calculations we have a tendency to study the influence of chemical compound separation and orientation, particularly for dimers that ar separated by many nanometers. [3]

Synthesis and biological characterization of silver nanoparticles derived from the cyanobacterium Oscillatoria limnetica

Using liquid class extracts within the synthesis of silver nanoparticle is looked as inexperienced, ecofriendly, low priced biotechnology that offers advancement over each chemical and physical strategies. within the current study, associate degree liquid extract of Oscillatoria limnetica recent biomass was used for the inexperienced synthesis of Ag-NPs, since O. limnetica extract plays a twin half in each reducing and helpful Oscillatoria-silver nanoparticles (O-AgNPs). The UV-Visible spectrum, Fourier transforms infrared (FT-IR), transmission microscopy (TEM) and scanning microscope (SEM) were achieved for confirming and characterizing the biosynthesized O-AgNPs. [4]

Silver Nanoparticles: Biosynthesis, Characterization and Application on Cotton Fabrics

Aim: Silver nanoparticles ar applied to textiles for his or her robust antimicrobial activity against human morbific microorganism that hooked up at clothes; improve the clinical dressing and potential uses in varied medical applications. within the gift study, the silver nanoparticles were synthesized by Aspergillus terreus A2-2, wherever the biomass filtrate of this strain was used for synthesis of silver nanoparticles (AgNPs). The latter is applied to cotton materials through pad-dry technique for rendering textiles medicinal drug property toward Gram positive microorganism diagrammatical by coccus aureus ATCC 29213 and Bacilli NCTC 10400. Gram negative microorganism diagrammatical by bacteria genus aeruginosa ATCC 9027 and E. coli ATCC 8739. [5]

Reference

[1] Sun, Y. and Xia, Y., 2002. Shape-controlled synthesis of gold and silver nanoparticles. Science, 298(5601), (Web Link)

[2] Morones, J.R., Elechiguerra, J.L., Camacho, A., Holt, K., Kouri, J.B., Ramírez, J.T. and Yacaman, M.J., 2005. The bactericidal effect of silver nanoparticles. Nanotechnology, 16(10), (Web Link)

[3] Hao, E. and Schatz, G.C., 2004. Electromagnetic fields around silver nanoparticles and dimers. The Journal of chemical physics, 120(1), (Web Link)

[4] Synthesis and biological characterization of silver nanoparticles derived from the cyanobacterium Oscillatoria limnetica
Ragaa A. Hamouda, Mervat H. Hussein, Rasha A. Abo-elmagd & Salwa S. Bawazir
Scientific Reportsvolume 9, Article number: 13071 (2019) (Web Link)

[5] Fouda, A. and Shaheen, T. I. (2017) “Silver Nanoparticles: Biosynthesis, Characterization and Application on Cotton Fabrics”, Microbiology Research Journal International, 20(1), (Web Link)