Silver nanoparticles procedures

Silver Nanoparticles Preparation. A colloidal suspension of citrate reduced silver nanoparticles was prepared using a modified Lee and Meisel [8] procedure. 

The use of solid silver nanoparticles indicates the 10-fold enhancement of Raman signals due to presence of art pigments. The enhancement of the order of magnitude is not SERS effect. However it is high enough to identify very small quantities of such specific samples as art pigment from canvas paintings. The proposed technique does not require any complex procedures for sample preparation. 

Instead of precursor metal salts, metal oxides could also be used. Silver-PS coreshell particles were thus recently synthesized using a two-step procedure [346]. First, hydrogen reduction of a saturated silver(I) oxide solution at elevated temperature was carried out in the presence of commercial sulfate-functionalized PS particles (200 nm) used as support for the reduction of Ag salt into silver. The formed Ag nanoparticles were attached to the PS particles (Fig. 42a). Subsequent acetone treatment led to the encapsulation of the silver nanoparticles inside the PS spheres (Fig. 42b), accompanied by a red-shift of the characteristic plasmon resonance frequency of the particles (Fig. 42c). 

EXPERIMENTAL PROCEDURES INVOLVED IN THE SYNTHESIS OF GOLD AND SILVER NANOPARTICLES USING PLANT EXTRACTS... 

It is also possible to produce antibacterial woven cotton and polyester fabrics using colloidal silver nanoparticles. Figure 1.14 clearly shows that silver nanoparticles are well-dispersed on the fibre surfaces in each fabric. In this procedure, woven cotton and polyester fabrics were padded through a certain concentration of silver colloids and squeezed to 83 % wet pick-up with a laboratory pad at a constant pressure. Textile fabrics in which the antibacterial activity shows good laundering durability can be easily obtained via the padding process using nanosized silver colloidal solutions. 

Commonly time-consuming and costly synthesis procedures of silver nanoparticles. Destroy beneficial bacteria in some cases. 

FIGURE 8.10 A schematic representation of the overall synthetic procedure for the fabrication of polymer nanofibers with embedded silver nanoparticles, including TEM and SEM images. (Adapted from Kong, H. and Jang, J., Oiem. Comm., 28, 3010, 2006.)... 

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