Journal article
Mobility of electrostatically and sterically stabilized gold nanoparticles (AuNPs) in saturated porous media
The stability of gold nanoparticles (AuNPs) stabilized electrostatically with citrate or (electro)sterically by commercially available amphiphilic block copolymers (PVP-VA or PVA-COOH) was studied under various physicochemical conditions. Subsequently, the mobility of the AuNPs in porous media (sand) was investigated in column studies under environmental relevant physicochemical conditions.
Electrostatically stabilized AuNPs were unstable under most physicochemical conditions due to the compression of the electrical double layer. Consequently, aggregation and deposition rapidly immobilized the AuNPs. Sterically stabilized AuNPs showed significantly less sensitivity towards changes in the physicochemical conditions with high stability, high mobility with negligible retardation, and particle deposition rate coefficients ranging an order of magnitude (1.5 × 10-3 to 1.5 × 10-2 min-1) depending on the type and amount of stabilizer, and thereby the surface coverage and attachment affinity.
The transport of sterically stabilized AuNPs is facilitated by reversible deposition in shallow energy minima with continuous reentrainment and blocking of available attachment sites by deposited AuNPs. The stability and mobility of NPs in the environment will thereby be highly dependent on the specific stabilizing agent and variations in the coverage on the NP.
Under the given experimental conditions, transport distances of the most mobile AuNPs of up to 20 m is expected. Due to their size-specific plasmonic properties, the easily detectable AuNPs are proposed as potential model or tracer particles for studying transport of various stabilized NPs under environmental conditions.
Language: | English |
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Publisher: | Springer Berlin Heidelberg |
Year: | 2019 |
Pages: | 29460-29472 |
ISSN: | 16147499 and 09441344 |
Types: | Journal article |
DOI: | 10.1007/s11356-019-06132-8 |
ORCIDs: | Fjordbøge, Annika Sidelmann , Jakobsen, Mogens Havsteen and Broholm, Mette Martina |
Amphiphilic block copolymers Citrate Gold nanoparticles Mobility Model nanoparticles Stability
Atmospheric Protection/Air Quality Control/Air Pollution Citrates Earth and Environmental Science Ecotoxicology Environment Environment, general Environmental Chemistry Environmental Health Gold Metal Nanoparticles Porosity Silicon Dioxide Static Electricity Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution