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Effect of polymer coating composition on the aggregation rates of Ag nanoparticles in NaCl solutions and seawaters

Effect of polymer coating composition on the aggregation rates of Ag nanoparticles in NaCl solutions and seawaters
Effect of polymer coating composition on the aggregation rates of Ag nanoparticles in NaCl solutions and seawaters
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.
0048-9697
1153-1162
Lodeiro, Pablo
f6c1011a-06d0-4095-bc45-2e15e9e492d0
Achterberg, Eric P.
685ce961-8c45-4503-9f03-50f6561202b9
Rey-Castro, Carlos
c9ba6881-700b-4331-8aed-5c0b1b401af8
El-Shahawi, Mohammad S.
28508d32-a6fe-4761-919d-a5874e6f4b79
Lodeiro, Pablo
f6c1011a-06d0-4095-bc45-2e15e9e492d0
Achterberg, Eric P.
685ce961-8c45-4503-9f03-50f6561202b9
Rey-Castro, Carlos
c9ba6881-700b-4331-8aed-5c0b1b401af8
El-Shahawi, Mohammad S.
28508d32-a6fe-4761-919d-a5874e6f4b79

Lodeiro, Pablo, Achterberg, Eric P., Rey-Castro, Carlos and El-Shahawi, Mohammad S. (2018) Effect of polymer coating composition on the aggregation rates of Ag nanoparticles in NaCl solutions and seawaters. Science of the Total Environment, 631-632, 1153-1162. (doi:10.1016/j.scitotenv.2018.03.131).

Record type: Article

Abstract

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.

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More information

Accepted/In Press date: 11 March 2018
e-pub ahead of print date: 16 March 2018
Published date: 1 August 2018

Identifiers

Local EPrints ID: 421588
URI: http://eprints.soton.ac.uk/id/eprint/421588
ISSN: 0048-9697
PURE UUID: 24d416c1-b7fb-4154-9bae-55bb16975851

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Date deposited: 15 Jun 2018 16:30
Last modified: 27 Apr 2022 11:17

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Contributors

Author: Pablo Lodeiro
Author: Carlos Rey-Castro
Author: Mohammad S. El-Shahawi

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