Natural polysaccharides and microfluidics: A win–win combination towards the green and continuous production of long-term stable silver nanoparticles. Issue 4 (August 2018)

• Record Type: Journal Article
• Authors: Giorello, Antonella; Gioria, Esteban; Hueso, Jose L.; Sebastian, Victor; Arruebo, Manuel; Veaute, Carolina; Gutierrez, Laura
• Is Part Of: Journal of environmental chemical engineering. Volume 6:Issue 4(2018)
• Page Start: 5069
• Page End: 5078
• Publication Date: 2018-08
• Subjects: Silver nanoparticles -- Green chemistry -- Continuous synthesis -- Microreactors -- Microfluidic; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2018.07.039
• Languages: English
• ISSNs: 2213-2929

Abstract

Graphical abstract: Highlights: Flow system yields in better Ag nanoparticle size distribution and good stability. The synthesis of Ag NPs in flow requires a reaction time lower than the batch method. A green protocol together with a continuous set up lead to a long-term stable Ag NPs. Highly stable Ag Np suspensions were obtained for potential bactericidal applications. Abstract: The present work combines the use of microfluidic reactors and green chemicals such as glucose and starch to achieve a continuous production of silver nanoparticles that have been successfully tested as excellent antibacterial agents against Escherichia coli . Those silver nanoparticles synthesized under continuous flow remained stable in terms of optical response, morphology and size distribution even after 48 months of storage at 24 °C without light protection. The best results in terms of colloidal stability were obtained after synthesizing those nanoparticles at 70 ºC in the presence of an excess of glucose when the continuous flow configuration was used to complete the reaction within 9 min. In contrast, analogous experiments carried out in batch conditions required a much longer period to achieve similar results but with much lower stability and a higher polydispersity, especially in the long-term storage range.