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

The Analyst
Nikolaos I KapakoglouAthanasios G Vlessidis

Abstract

In this work, a new approach for visual sensing of Cr3+ in aqueous solutions is presented, based on the morphological changes induced by Cr3+ on (4-carboxybenzyl)bis[2-(undec-10-enyloxycarbonyl)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 Cr3+ 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 Cr3+ concentration, a feature which was exploited for the analytical determination of Cr3+ 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 Cr3+ in real samples with minimal sample pre-treatm...Continue Reading

References

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Jul 21, 2006·The Journal of Physical Chemistry. B·Catherine J MurphyTan Li
Jun 4, 2008·Journal of the American Chemical Society·Gopala Krishna DarbhaParesh Chandra Ray

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Citations

Dec 21, 2010·Analytica Chimica Acta·Dimosthenis L Giokas, Athanasios G Vlessidis

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