Stable Silver Clusters and Nanoparticles Prepared in Polyacrylate and Inverse Micellar Solutions

Abstract

Silver clusters and nanoparticles were prepared by reduction of silver nitrate by sodium borohydride in water, in the presence of polyacrylate ions, and in inverse micellar solutions consisting of Laureth 4 and water. The kinetics of formation of Ag 4 2+ aggregates and Ag 9 + in the presence of polyacrylate ions could be observed by the stopped-flow technique, and the characteristic UV absorption spectra of the respective stable clusters were recorded. The formation of these species was critically dependent on the manner in which reactants were combined. The silver nanoparticles prepared in the inverse micellar solutions using different mixing procedures were characterized via UV-vis spectra, dynamic light scattering, and transmission electron microscopy. The results showed that the procedure of adding aqueous sodium borohydride solution into the inverse micellar solution containing silver nitrate gave the most uniform spherical silver nanoparticles. The reaction kinetics of this procedure was investigated through UV-vis spectra, which indicated that the generation of silver nanoparticles occurred in parallel with the disappearance of smaller clusters, and was characterized by a single exponential with a time constant of about 18 s, followed by aggregation into much larger particles.

Gold and silver nanoparticles from Trianthema decandra: synthesis, characterization, and antimicrobial properties

“…For the synthesis of gold and silver nanoparticles, 10 mL of 1 mM aqueous HAuCl 4 and AgNO 3 solutions were separately added to 5 mL, 10 mL, and 15 mL of aqueous root extract and incubated in the dark. The resulting colloidal solutions of gold and silver were then analyzed using ultraviolet-visible spectroscopy.…”

“…Bioreduction of HAuCl 4 and AgNO 3 was recorded as a function of time using water as a reference at 3-hour intervals from zero hour up to 24 hours using an ultraviolet-visible spectrophotometer (Perkin-Elmer, Boston, MA) in a scanning range of 200 nm to 800 nm.…”

New procedure to synthesize silver nanoparticles and their interaction with local anesthetics

“…The performance of these NPs is also determined in large measure by their self-aggregation in solution or on different substrates when more or less ordered self-assemblies are built, presenting various sizes and arrangement of particles. 8 Silver NPs (AgNPs) are of great interest for their various applications in microelectronics, photonics and photocatalysis, surface-enhanced Raman scattering, [9][10][11] and as antibacterial and antimicrobial agents. [12][13][14][15][16] Bioconjugates of AgNPs have also been prepared and their self-assembly investigated.…”

Recent Progress in Nanoparticle Dispersion Using Bead Mill

“…Polyacrylate salt SiO 2 , Ag, Fe 3 O 4 , BaTiO 3 (Hajdú A. et al, 2012;Pu Z. et al, 1997;Shen Z.-G. et al, 2004;Zhang Z. et al, 2000) Polyurethane, polyester type Fe 3 O 4 (Ashjari M. et al, 2010) Poly(N-isopropyl acrylamide) Ag (Dong Y. et al, 2007) Fluoride surfactant…”