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Stability of core/shell quantum dots-role of pH and small organic ligands
Domingos, R. F.; Franco, C.; Pinheiro, J. P.The improvement of knowledge about the toxicity and even processability, and stability of quantum dots (QD) requires the understanding of the relationship between the QD binding head group, surface structure, and interligand interaction. The scanned stripping chronopotentiometry and absence of gradients and Nernstian equilibrium stripping techniques were used to determine the concentration of Cd dissolved from ...
Electrochemical methods for speciation of trace elements in marine waters. Dyna...
Mota, A. M.; Pinheiro, J. P.; Simões Gonçalves, M. L.The contribution of electrochemical methods to the knowledge of dynamic speciation of toxic trace elements in marine waters is critically reviewed. Due to the importance of dynamic considerations in the interpretation of the electrochemical signal, the principles and recent developments of kinetic features in the interconversion of metal complex species will be presented. As dynamic electrochemical methods, onl...
Experimental verification of the metal flux enhancement in a mixture of two met...
Pinheiro, J. P.; Salvador, J.; Companys, E.; Galceran, J.; Galceran, J.Rigorous computation of the metal flux crossing a limiting surface of a system that contains a mixture of 1 : 1 metal complexes under steady-state planar diffusion in a finite domain and under excess of ligand conditions predicts, for some cases, an enhancement of the metal flux with respect to that expected in a system with independent complexes. Indeed, the coupling of the dissociation kinetics of both comple...
The use of microelectrodes with AGNES
Huidobro, C.; Companys, E.; Puy, J.; Galceran, J.; Pinheiro, J. P.Absence of gradients and nernstian equilibrium stripping (AGNES) is a new electroanalytical technique designed to determine free heavy metal ion concentrations in solutions. AGNES had been applied, up to date, with conventional equipment such as the hanging mercury drop electrode (HMDE). Due to their much smaller volume, microelectrodes can reach a given preconcentration factor within a much shorter deposition ...
Metal speciation dynamics in colloidal ligand dispersions. Part 3: Lability fea...
Pinheiro, J. P.; Domingos, R. F.; Minor, M.; Van Leeuwen, H. P.A lability criterion is developed for dynamic metal binding by colloidal ligands with convective diffusion as the dominant mode of mass transport. Scanned stripping chronopotentiometric measurements of Pb(II) and Cd(II) binding by carboxylated latex core-shell particles were in good agreement with the predicted values. The dynamic features of metal ion binding by these particles illustrate that the conventional...
Electrochemical DNA sensor for detection of single nucleotide polymorphisms
Marques, L. P. J.; Cavaco, Isabel Maria Palma Antunes; Pinheiro, J. P.; Ribeiro, Vera; Ferreira, GuilhermeIn recent years there has been an increased interest in using biosensors for the recognition and monitoring of molecule interactions. DNA sensors and gene chips are particularly relevant for directly applying the information gathered from the genome projects. In this work electrochemical techniques are used to develop methodologies to detect DNA polymorphisms in human genes using cytochrome P450 3A4 (CYP3A4) as...
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