Influence of dissolved oxygen on aggregation kinetics of citrate-coated silver nanoparticles

Wen Zhang, Ying Yao, Kungang Li, Ying Huang, Yongsheng Chen

Research output: Contribution to journalArticlepeer-review

63 Scopus citations

Abstract

Aggregation, an important environmental behavior of silver nanoparticles (AgNPs) influences their bioavailability and cytotoxicity. The work studied the influence of dissolved oxygen (DO) or the redox potential on the stability of AgNPs in aqueous environments. This study employed time-resolved dynamic light scattering (TR-DLS) to investigate the aggregation kinetics of citrate-coated AgNPs. Our results demonstrated that when DO was present, the aggregation rates became much faster (e.g., 3-8 times) than those without DO. The hydrodynamic sizes of AgNPs had a linear growth within the initial 4-6 h and after the linear growth, the hydrodynamic sizes became random for AgNPs in the presence of DO, whereas in the absence of DO the hydrodynamic sizes grew smoothly and steadily. Furthermore, the effects of primary particles sizes (20, 40, and 80 nm) and initial concentrations (300 and 600 μg/L) of AgNPs on aggregation kinetics were also investigated.

Original languageEnglish (US)
Pages (from-to)3757-3762
Number of pages6
JournalEnvironmental Pollution
Volume159
Issue number12
DOIs
StatePublished - Dec 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Toxicology
  • Pollution
  • Health, Toxicology and Mutagenesis

Keywords

  • Aggregation
  • Ion release
  • Silver nanoparticle
  • Stability

Fingerprint

Dive into the research topics of 'Influence of dissolved oxygen on aggregation kinetics of citrate-coated silver nanoparticles'. Together they form a unique fingerprint.

Cite this