Effect of storage conditions on long-term stability of Ag nanoparticles formed via green synthesis

被引:0
作者
Oksana Velgosova
Elena Čižmárová
Jaroslav Málek
Jana Kavuličova
机构
[1] Technical University of Kosice,Institute of Materials, Faculty of Metallurgy
[2] Czech Technical University in Prague,Department of Materials Engineering, Faculty of Mechanical Engineering
[3] Technical University of Kosice,Institute of Metallurgy, Faculty of Metallurgy
来源
International Journal of Minerals, Metallurgy, and Materials | 2017年 / 24卷
关键词
silver nanoparticles; stability; storage conditions; green synthesis;
D O I
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摘要
Spherical Ag nanoparticles (AgNPs) with a diameter of 20 nm or smaller were biologically synthesized using algae Parachlorella kessleri. The effect of storage conditions on the long-term stability of AgNPs was investigated. UV/Vis spectrophotometry, transmission electron microscopy, and dynamic light scattering measurements revealed that the long-term stability of AgNPs was influenced by light and temperature conditions. The most significant loss of stability was observed for the AgNPs stored in daylight at room temperature. The AgNPs stored under these conditions began to lose their stability after approximately 30 d; after 100 d, a substantial amount of agglomerated particles settled to the bottom of the Erlenmeyer flask. The AgNPs stored in the dark at room temperature exhibited better long-term stability. Weak particle agglomeration began at approximately the 100th day. The AgNPs stored in the dark at about 5°C exhibited the best long-term stability; the AgNPs stored under such conditions remained spherical, with a narrow size distribution, and stable (no agglomeration) even after 6 months. Zeta-potential measurements confirmed better dispersity and stability of AgNPs stored under these conditions.
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页码:1177 / 1182
页数:5
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