Silver nanocolloid generation using dynamic Laser Ablation Synthesis in Solution system and drop-casting

Production of Silver Nano-Inks and Surface Coatings for Anti-Microbial Food Packaging and Its Ecological Impact

“…Nano colloids of smaller particle size distribution absorb the incident light and exhibit absorption peaks around 400 nm wavelength region. However, the colloids consisting of more significant particle size distribution creates light scattering and form broad absorption peak and shift toward the longer wavelength leading to a red shift phenomenon [ 19 , 20 ]. Such red shift was not explicitly observed for any nanoparticle produced in the present study.…”

“…Therefore, ξ determination is very important for nano colloids. Due to electrostatic repulsion between each individual NPs, colloids with a large positive/negative ξ value generally indicate good stability [ 9 , 20 ]. A small ξ value indicates the Nps aggregation due to the van der Waals attractive forces, leading to colloidal instability [ 9 , 19 ].…”

“…Silver nanoparticles were produced using batch ( Figure 10 a) and recirculatory flow-based ( Figure 10 c) by laser ablation synthesis in solution (LASiS) technique as previously described in the literature [ 19 , 20 ]. The laser system was a picosecond-pulsed WEDGE HF 1064 (BrightSolutions, Pavia, Italy) Nd:YAG with a wavelength of 1064 nm, maximum output power of 1.2 W, pulse-width of 700 pS and a pulse repetition rate of 10 kHz [ 20 ]. The beam was rastered using an SS-12 2D-scanning galvanometer (Raylase, Weßling, Germany) in an Archimedean spiral pattern with a 5 mm outer diameter at a velocity of 5 mm·s −1 .…”

“…For batch LASiS, the target material was placed in a beaker and submerged in 4 mL of DI water. For recirculatory flow LASiS, an in-house designed polymer 3D-printed flow cell described, previously described in the literature contained the target material [ 19 , 20 , 21 ]. A peristaltic pump (Millipore Ltd., Burlington, VT, USA) was used to maintain a recirculating flow of DI-water over the AG target surface at 100 mL min −1 .…”

“…Samples for transmission electron microscopy (TEM) analysis were prepared by deposition of particles suspended in water on Plano grids [ 21 ]. UV-Vis analysis was performed using a Biochrom Libra S22 UV-Vis spectrophotometer, with a scanning range of 200–900 nm with DI water background [ 20 ]. For both DLS and UV-Vis measurements, a one-in-ten dilution of the colloid was used to mitigate measurement saturation, and no post-filtration was performed, ensuring that the DLS and UV-Vis characterisations were representative of the production process.…”