NDLI: Combined cloud point extraction and Tween 20-stabilized gold nanoparticles for colorimetric assay of silver nanoparticles in environmental water

Content Provider	Royal Society of Chemistry (RSC)
Author	Tseng, Wei-Lung Wu, Zong-Han
Copyright Year	2011
Abstract	This study investigated a simple, sensitive, and selective method for the colorimetric assay of silver nanoparticles (AgNPs) using Triton X-114-based cloud point extraction (CPE) as a preconcentration step and Tween 20-stabilized gold nanoparticles (Tween 20-AuNPs) as a colorimetric probe. After heating beyond the cloud point temperature of Triton X-114, a solution containing Triton X-114 micelles and AgNPs separated into a surfactant-rich phase (small volume) and a dilute aqueous phase. AgNPs partitioned into a Triton X-114-rich phase through a hydrophobic interaction between Triton X-114 micelles and AgNPs. After phase separation, the concentrated AgNPs oxidized to form Ag+ upon adding H2O2. The generated Ag+ triggered the aggregation of Tween 20-AuNPs in a high-ionic-strength solution because the reduction of Ag+ on the AuNP surface enabled Tween 20 (stabilizer) to be removed from the NP surface. The efficiency of Triton X-114-based CPE for the AgNPs was found to be insensitive to their coating type when the AgNPs were modified with a nonionic surfactant and a small ligand. Under optimal extraction and detection conditions, the selectivity of this method for AgNPs was greatly higher than for other nanomaterials. The limit of detection for 10 nm AgNPs was measured to be 1 ng mL−1. This method was successfully applied to the analysis of 10 nm AgNPs in tap water and seawater.
Starting Page	2915
Ending Page	2920
Page Count	6
File Format	HTM / HTML PDF
ISSN	17599660
Volume Number	3
Issue Number	12
Journal	Analytical Methods
DOI	10.1039/c1ay05516j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Cloud point NP Hydrogen peroxide Ligand Polysorbate 20 Triton CPE Nanomaterials Hydrophobe Surfactant
Content Type	Text
Resource Type	Article
Subject	Analytical Chemistry Engineering Chemical Engineering

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