Abstract
Silver nanoparticles were synthesized by mixing two micro-emulsion systems – one with precursor (AgNO3) and one with reducing agent (NaBH4). Dioctyl sodium sulfonsuccinate – AOT was used as surfactant. We studied parameters as ω – molar ratio of water to surfactant, hydrocarbon (oil) types. The molar ratio of water to surfactant was changed from 2.5 to 5; 7.5 and 10. The used oil types were cyclohexane, iso-octane, and dodecane. XRD, UV-Vis and TEM images were used to elucidate the structure and size of the products. The results showed that, synthesized silver nanoparticles sizes were between 5 – 7 nm, with homogeneously spherical shapes. The silver colloids were used in antibacterial applications. The antibacterial efficiency was very high, above 99% at ~ 4 μg/ml concentration of silver nanoparticles.
Highlights
Silver nanoparticles have extensive applications in electronics [1, 2], optoelectronics [3], catalytic chemistry [4], and especially biomedicine [5, 6]
As we mixed the two micro-emulsion systems, we observed that the solution color changed with time, from light yellow to yellow and dark yellow, pale brown and dark brown
The XRD pattern confirmed the existence of silver nanoparticles in the solution
Summary
Silver nanoparticles have extensive applications in electronics [1, 2], optoelectronics [3], catalytic chemistry [4], and especially biomedicine [5, 6]. The excellent anti-bacterial properties of silver nanoparticles can hardly be found in any other materials. This makes silver one of the most studied and researched materials. There are many methods for synthesizing silver nanoparticles such as chemical reduction [7], photo reduction [8], laser ablation [9], gamma radiation [10], etc. Most of these methods are to produce the nanoparticles of a few ten nanometers in diameter and with broad size spectra. To our knowledge, there is very limited research in Vietnam about silver nanoparticles synthesis in micro-emulsion system
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