Effect of storage conditions on long-term stability of Ag nanoparticles formed via green synthesis
来源期刊：International Journal of Minerals Metallurgy and Materials2017年第10期
论文作者：Elena ?i?márová Jaroslav Málek
文章页码：1177 - 1182
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 100 th day. The AgNPs stored in the dark at about 5℃ 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.
Elena ?i?márová2，Jaroslav Málek2
2. Department of Materials Engineering, Faculty of Mechanical Engineering, Czech Technical University in Prague
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 100 th day. The AgNPs stored in the dark at about 5℃ 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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