Stable Silver Nanoparticles Immobilized in Mesoporous Silica

Abstract

Silver nanoparticles have been produced by γ-irradiation of silver solution in optically transparent inorganic mesoporous silica. The reduction of Ag + within the matrix is brought about by hydrated electrons and hydroalkyl radicals generated during the radiolysis of the 2-propanol solution. The particles formed within the silica matrix were studied by electron microscopy, nitrogen sorption measurements, and absorption spectroscopy. The particles were mostly confined and dispersed in the pores of the mesoporous hosts. Absorption spectra show that the mean Ag clusters size increases with the irradiation dose. At high dose, agglomerated large particles are formed. In contrast, at a given dose, the effect of the dose rate has been clearly demonstrated to lower the cluster size. The silver particles within the silica matrix are stable in the presence of oxygen for at least several months.

Preparation of colloidal silver nanoparticles in poly(N-vinylpyrrolidone) by γ-irradiation

“…chemical [10][11][12][13], electrochemical [14] and photochemical reduction [15], ultrasound [16], microwave [17] gamma and electron irradiation [18][19][20][21][22][23][24]) for the synthesis of silver nanoparticles with different stabilisers have been developed.…”

Antibacterial activity of silver-carried sodium zirconium phosphate prepared by ion-exchange reaction

“…Compared to organic antibacterial agents, inorganic antibacterial agents possessed so many outstanding properties, such as longlasting effects, broad-spectrum antibiosis and better heat resistance, that they can be used in the manufacture of antibacterial materials and products. 1) Silver ion is known to possess higher antibacterial activity and less toxicity comparing to other metal ions, 2)-5) thus several kinds of silver-carried antibacterial agents using different inorganic carriers, such as zeolite, 6) phosphate, 7), 8) titanium dioxide, 9) activated carbon, 10) montmorillonite, 11) water-soluble glass 12) and mesoporous silica 13) have been investigated now. Silver-carried zirconium phosphate (AgZrP) was recently emerging as various commercial products due to its best color stability among silvercarried antibacterial agents, and the study was especially focused on the preparation and the properties for practical applications.…”

Synthesis of Silver Nanoparticles with Tunable Morphologies via a Reverse Nano-Emulsion Route

“…Silver nanoparticles, as a nanomaterial of noble metals, have been widely explored for their applications in catalysis, 8) electronics, 9) surface-enhanced Raman scattering (SERS) 10) and many other fields. Silver nanoparticles could be prepared by many methods, including chemical reduction in aqueous or non-aqueous solutions, 11,12) electrochemical reduction, 13) template method, 14) ultrasonic-assisted reduction, 15) photoinduced or photocatalytic reduction, 16) biochemical reduction, 17) irradiation reduction 18) and microwave-assisted synthesis. 19) Among these methods, nanoemulsion is an efficient method to control the size, shape and structure of the nanoparticles which have significant effects on their geometric features and properties.…”