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

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°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.

Keywords

silver nanoparticles / stability / storage conditions / green synthesis / Parachlorella kessleri

References

[1] Ider M., Abderrafi K., Eddahbi A., Ouaskit S., Kassiba A. Rapid synthesis of silver nanoparticles by microwave- polyol method with the assistance of latex copolymer. J. Cluster Sci., 2016, 28(3): 1.

[2] Shim I.K., Lee Y., Lee K.J., Joung J. An organometallic route to highly monodispersed silver nanoparticles and their application to ink-jet printing. Mater. Chem. Phys., 2008, 110(2-3): 316.

[3] Davenas J., Ltaief A., Barlier V., Boiteux G., Bouazizi A. Nanomaterials for photovoltaic conversion. Mater. Sci. Eng. C, 2008, 28(5-6): 744.

[4] Lah N.A.C., Johan M.R. Facile shape control synthesis and optical properties of silver nanoparticles stabilized by Daxad 19 surfactant. Appl. Surf. Sci., 2011, 257, 7494.

[5] Espenti C.S., Krishna Rao K.S.V., Rao K.M. Bio-synthesis and characterization of silver nanoparticles using Terminalia chebula leaf extract and evaluation of its antimicrobial potential. Mater. Lett., 2016, 174, 129.

[6] Venugobal J., Anandalakshmi K. Green synthesis of silver nanoparticles using Commiphora caudata leaves extract and the study of bactericidal efficiency. J. Cluster Sci., 2016, 27(5): 1683.

[7] Zhang W.C., Zhang L., Sun Y. Size-controlled green synthesis of silver nanoparticles assisted by L-cysteine. Front. Chem. Sci. Eng., 2015, 9(4): 494.

[8] Rostami-Vartooni A., Nasrollahzadeh M., Alizadeh M. Green synthesis of perlite supported silver nanoparticles using Hamamelis virginiana leaf extract and investigation of its catalytic activity for the reduction of 4-nitrophenol and Congo red. J. Alloys Compd., 2016, 680, 309.

[9] Yilmaz M., Turkdemir H., Kilic M.A., Bayram E., Ciceke A., Mete A., Ulug B. Biosynthesis of silver nanoparticles using leaves of Stevia rebaudiana. Mater. Chem. Phys., 2011, 130(3): 1195.

[10] Zhao Z.Y., Wang M.H., Liu T.T. Tribulus terrestris leaf extract assisted green synthesis and gas sensing properties of Ag-coated ZnO nanoparticles. Mater. Lett., 2015, 158, 274.

[11] Roopan Rohit S.M., Madhumitha G., Rahuman A.A., Kamaraj C., Bharathi A., Surendra T.V. Low-cost and eco-friendly phyto-synthesis of silver nanoparticles using Cocos nucifera coir extract and its larvicidal activity. Ind. Crops Prod., 2013, 43(1): 631.

[12] Fayaz A.M., Girila M., Rahman M., Venkatesan R., Kalaichelvan P.T. Biosynthesis of silver and gold nanoparticles using thermophilic bacterium Geobacillus stearothermophilus. Process Biochem., 2011, 46(10): 1958.

[13] Sohrabnezhad S.h., Rassa M., Seifi A. Green synthesis of Ag nanoparticles in montmorillonite. Mater. Lett., 2016, 168, 28.

[14] Vinmathi V., Jacob S.J.P. A green and facile approach for the synthesis of silver nanoparticles using aqueous extract of Ailanthus excelsa leaves, evaluation of its antibacterial and anticancer efficacy. Bull. Mater. Sci., 2015, 38(3): 625.

[15] Joseph S., Mathew B. Microwave-assisted facile green synthesis of silver nanoparticles and spectroscopic investigation of the catalytic activity. Bull. Mater. Sci., 2015, 38(3): 659.

[16] Shukla S.P., Roy M., Mukherjee P., Tyagi A.K., Mukherjee T., Adhikari S. Interaction of bilirubin with Ag and Au ions: green synthesis of bilirubin-stabilized nanoparticles. J. Nanopart. Res., 2012, 14(7): 981.

[17] Shukla S.P., Roy M., Mukherjee P., Das L., Neogy S., Srivastava D., Adhikari S. Size selective green synthesis of silver and gold nanoparticles: Enhanced antibacterial efficacy of resveratrol capped silver sol. J. Nanosci. Nanotechnol., 2016, 16(3): 2453.

[18] Gorham J.M., Rohlfing A.B., Lippa K.A., MacCuspie R.I., Hemmati A., Holbrook R.D. Storage wars: how citrate-capped silver nanoparticle suspensions are affected by not-so-trivial decisions. J. Nanopart. Res., 2014, 16(4): 2339.

[19] Izak-Nau E., Huk A., Reidy B., Uggerud H., Vadset M., Eiden S., Voetz M., Himly M., Duschl A., Dusinska M., Lynch I. Impact of storage conditions and storage time on silver nanoparticles' physicochemical properties and implications for their biological effects. RSC Adv., 2015, 5(102): 84172.

[20] Shankar S., Ahmad A., Sastry M. Geranium leaf assisted biosynthesis of silver nanoparticles. Biotechnol. Prog., 2003, 19(6): 1627.

[21] Bankura K.P., Maity D., Mollick M.M.R., Mondal D., Bhowmick B., Bain M.K., Chakraborty A., Sarkar J., Acharya K., Chattopadhyay D. Synthesis, characterization and antimicrobial activity of dextran stabilized silver nanoparticles in aqueous medium. Carbohydr. Polym., 2012, 89(4): 1159.

[22] Petit C., Lixon P., Pileni M.P. In situ synthesis of silver nanocluster in AOT reverse micelles. J. Phys. Chem., 1993, 97(49): 12974.

[23] Villanueva-Ibáñez M., Yañez-Cruz M.G., Álvarez-García R., Hernández-Pérez M.A. Aqueous corn husk extract–mediated green synthesis of AgCl and Ag nanoparticles. Mater. Lett., 2015, 152, 166.

[24] Patel K., Kapoor S., Dave D.P., Mukherjee T. Synthesis of nanosized silver colloids by microwave dielectric heating. J. Chem. Sci., 2005, 117(1): 53.

[25] Schneider S., Halbig P., Grau H., Nickel U. Reproducible preparation of silver sols with uniform particle size for application in surface-enhanced Raman spectroscopy. Photochem. Photobiol., 1994, 60(6): 605.

[26] Xia Y., Halas N.J. Shape-controlled synthesis and surface plasmonic properties of metallic nanostructures. MRS Bull., 2005, 30(5): 338.