Development of a chromium speciation probe based on morphology-dependent aggregation of polymerized vesicle-functionalized gold nanoparticles

 
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2009 (EN)
Development of a chromium speciation probe based on morphology-dependent aggregation of polymerized vesicle-functionalized gold nanoparticles (EN)

Kapakoglou, N. I. (EN)

Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας (EL)
Kapakoglou, N. I. (EN)

In this work, a new approach for visual sensing of Cr(3+) in aqueous solutions is presented, based on the morphological changes induced by Cr(3+) on (4-carboxybenzyl)bis[2-(undec-10enyloxycarbonyl)ethyl] methylammonium bromide (4-CBUAB)-polymerized vesicles. CTAB-stabilized gold nanoparticles (GNPs) react with 4-CBUAB-polymerized vesicles to form aggregates via vesicle micelle interactions, which does not proceed further because of vesicle-vesicle repulsive forces, creating a large polymerized vesicle-gold nanoparticle (PV-GNP) conjugate. The incorporation of Cr(3+) through the 4-CBUAB polymeric membrane induces structural perturbations on the polymerized vesicle morphology by swelling of the lamellar phase which is reflected in the morphology of the polymerized vesicle-gold nanoparticle conjugate assembly. These steric perturbations induce a linear increase in the absorbance of the solutions as a function of Cr(3+) concentration, a feature which was exploited for the analytical determination of Cr(3+) in real samples. Owing to the high selectivity of the polymerized vesicular aggregate no interferences from co-existing species were observed, enabling the determination and speciation of Cr(3+) in real samples with minimal sample pre-treatment and without preconcentration. The analytical merits afford detection limits as low as 0.72 mg L(-1) by extracting only 5 mL of sample volume with satisfactory reproducibility (RSD = 5.21%, C = 10 mu g L(-1), n = 6), which are directly comparable to those attained with more sophisticated techniques. (EN)

heavy-metal ions (EN)

Πανεπιστήμιο Ιωαννίνων (EL)
University of Ioannina (EN)

Analyst (EN)

2009

<Go to ISI>://000271864900016

Royal Society of Chemistry (EN)



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