The use of PWHM and Mie methods in estimation of colloidal silver particle size obtained by chemical precipitation with sodium borohydride
Autor: | Damir Barbir, Pero Dabić, Mario Meheš |
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Jazyk: | angličtina |
Rok vydání: | 2019 |
Předmět: |
silver nanoparticles
Materials science Tyndall effect General Chemical Engineering Nanoparticle 02 engineering and technology 010402 general chemistry lcsh:Chemical technology 01 natural sciences Silver nanoparticle Colloid Sodium borohydride chemistry.chemical_compound lcsh:TP1-1185 colloid tyndall's effect uv/vis spectroscopy General Chemistry UV/Vis spectroscopy Tyndall's effect colloid absorption reducing agent 021001 nanoscience & nanotechnology 0104 chemical sciences Silver nitrate chemistry Particle size Absorption (chemistry) 0210 nano-technology absorption reducing agent Nuclear chemistry |
Zdroj: | Hemijska Industrija, Vol 73, Iss 6, Pp 397-404 (2019) |
ISSN: | 2217-7426 |
Popis: | Unique antibacterial properties of silver have been known since the time of Egyptian pharaohs. With the discovery of antibiotics at the beginning of the twentieth century, silver is mostly pushed out from conventional medicine. However, with the excessive use of antibiotics, antibiotic-resistant super bacteria have appeared. Therefore, there is an increased interest in studying the antibacterial effects of colloidal silver. In this paper, the influence of various concentrations of silver nitrate on formation of colloidal silver particles in the solution was investigated. Colloidal silver was prepared by a chemical precipitation method using sodium borohydride as a reducing agent. As influence factors, color of the solution, Tyndall effect, UV/Vis absorption, and nanoparticle size estimated by PWHM (Peak Width at Half Maximum) and Mie methods were used. By increasing the silver concentration, color of the solution ranged from light yellow to dark yellow. All solutions showed Tyndall's effect equally. By the UV/Vis analysis it was found that the solutions absorbed radiation in the wavelength range 390-402 nm, and the intensity increased with increasing silver nitrate concentrations. By the PWHM and Mie methods silver nanoparticle sizes were estimated in the range 12-20 nm. |
Databáze: | OpenAIRE |
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