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

Oksana Velgosova; Elena &#268;i&#382;m&#225;rov&#225;; Jaroslav M&#225;lek; Jana Kavuli&#269;ova

doi:10.1007/s12613-017-1508-0

Volume 24 Issue 10

Oct. 2017

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2017 > 24(10): 1177-1182

Oksana Velgosova, Elena Čižmárová, Jaroslav Málek, and Jana Kavuličova, Effect of storage conditions on long-term stability of Ag nanoparticles formed via green synthesis, Int. J. Miner. Metall. Mater., 24(2017), No. 10, pp. 1177-1182. https://doi.org/10.1007/s12613-017-1508-0

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Oksana Velgosova, Elena Čižmárová, Jaroslav Málek, and Jana Kavuličova, Effect of storage conditions on long-term stability of Ag nanoparticles formed via green synthesis, Int. J. Miner. Metall. Mater., 24(2017), No. 10, pp. 1177-1182. https://doi.org/10.1007/s12613-017-1508-0

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Research Article

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

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Corresponding author:
Oksana Velgosova E-mail: oksana.velgosova@tuke.sk
Received: 9 February 2017; Revised: 25 April 2017; Accepted: 26 April 2017

Abstract

Abstract

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℃ 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.
- silver nanoparticles;
- stability;
- storage conditions;
- green synthesis;
- Parachlorella kessleri

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