Effect of polymer coating composition on the aggregation rates of Ag nanoparticles in NaCl solutions and seawaters
MetadataShow full item record
The aggregation behaviour of polymer-coated silver nanoparticles (AgNPs) was characterized in NaCl solutions, and in two seawaters of different salinities and dissolved organic matter (DOM) contents. Representative organic coatings i.e. tannic acid (TA), alginic acid (ALG), two gum Arabic samples (GAL and GAH), branched polyethylenimine (BPEI), and non-ionic surfactants (reference material NM-300K) were selected to cover a wide range of zeta-potentials. The stability in NaCl solutions, as determined from the rate of variation in hydrodynamic size within a timeframe of one hour, followed the order BPEI ≫ NM-300K ≈ GAL ≫ ALG ≈ TA ≫ GAH. In the seawater samples the order was NM-300K ≈ GAL ≫ ALG > GAH > TA ≈ BPEI, and only TA, GAL and NM-300K batches behaved as expected from the NaCl experiments. Remarkably, the BPEI sample showed the largest aggregation rate in the seawater sample with the highest DOM concentration (277 μM C). The GAH sample displayed a non-monotonic variation in aggregation rate with NaCl concentration, apparently due to concomitant precipitation of AgCl. The results indicate that non-electrostatic stabilization mechanisms and DOM-coating interactions are important for the prediction of stability and persistence of polymer-coated AgNPs in seawater.
Is part ofScience of the Total Environment, 2018, vol. 631-632, p. 1153-1162
European research projects
The following license files are associated with this item:
Showing items related by title, author, creator and subject.
Silver nanoparticles coated with natural polysaccharides as models to study AgNP aggregation kinetics using UV-Visible spectrophotometry upon discharge in complex environments Lodeiro, Pablo; Achterberg, Eric P.; Pampín, Joaquín; Affatati, Alice; El-Shahawi, Mohammad S. (Elsevier, 2016-01-01)This study provides quantitative information on the aggregation and dissolution behaviour of silver nanoparticles (AgNPs) upon discharge in fresh and sea waters, represented here as NaCl solutions of increasing ionic ...
Detection of silver nanoparticles in seawater at ppb levels using UV-visible spectrophotometry with long path cells Lodeiro, Pablo; Achterberg, Eric P.; El-Shahawi, Mohammad S. (Elsevier, 2017-03-01)Silver nanoparticles (AgNPs) are emerging contaminants that are difficult to detect in natural waters. UV-visible spectrophotometry is a simple technique that allows detection of AgNPs through analysis of their characteristic ...
Lodeiro, Pablo; Browning, Thomas J.; Achterberg, Eric P.; Guillou, Aurélie; El-Shahawi, Mohammad S. (Springer Nature, 2017-09-07)Inputs of silver nanoparticles (AgNPs) to marine waters continue to increase yet mechanisms of AgNPs toxicity to marine phytoplankton are still not well resolved. This study reports a series of toxicity experiments on a ...