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http://dx.doi.org/10.11001/jksww.2013.27.5.571

Aggregation Behavior of Silver and TiO2 Nanoparticles in Aqueous Environment  

Lim, Myunghee (안전성평가연구소, 미래환경연구센터)
Bae, Sujin (안전성평가연구소, 미래환경연구센터)
Lee, Yong-Ju (안전성평가연구소, 미래환경연구센터)
Lee, Sung-Kyu (안전성평가연구소, 미래환경연구센터)
Hwang, Yu Sik (안전성평가연구소, 미래환경연구센터)
Publication Information
Journal of Korean Society of Water and Wastewater / v.27, no.5, 2013 , pp. 571-579 More about this Journal
Abstract
The aggregation behaviors of silver nanoparticles (AgNPs) and titanium dioxide ($TiO_2$) nanoparticles were investigated. Time-resolved dynamic light scattering (DLS) was used to study the initial aggregation of AgNPs and $TiO_2$ over a range of mono (NaCl) and divalent ($CaCl_2$) electrolyte concentrations. The effects of pH, initial concentration of NPs and natural organic matters (NOM) on the aggregation of NPs were also investigated. The aggregation of both nanoparticles showed classical Derjaguin-Landau-Verwey-Overbeek (DLVO) type behavior. Divalent electrolyte was more efficient in destabilize the AgNPs and $TiO_2$ than monovalent electrolyte. The effect of pH on the aggregation of AgNPs was not significant. But the aggregation rate of $TiO_2$ was much higher with increasing pH. Higher NPs concentration leads to faster aggregation. Natural organic matter (NOM) was found to substantially hinder the aggregation of both AgNPs and $TiO_2$. This study found that the aggregation behavior of AgNPs and $TiO_2$ are closely associated with environmental factors such as ionic strength, pH, initial concentration of NPs and NOM.
Keywords
silver nanoparticles; $TiO_2$; aggregation; ionic strength; natural organic matter;
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