By a News Reporter-Staff News Editor at Life Science Weekly -- Investigators publish new report on Environmental Pollution. According to news reporting originating from Lisbon, Portugal, by NewsRx correspondents, research stated, "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 a polyacrylate-stabilized CdTe/CdS QD."
Our news editors obtained a quote from the research from Technical University, "The effects of various concentrations of small organic ligands such as citric acid, glycine, and histidine and the roles of pH (4.5-8.5) and exposure time (0-48 h) were evaluated. The highest QD dissolution was obtained at the more acidic pH in absence of the ligands (52%) a result of the CdS shell solubility. At pH 8.5 the largest PAA ability to complex the dissolved Cd leads to a further QD solubility until the equilibrium is reached (24% of dissolved Cd vs. 4% at pH 6.0). The citric acid presence resulted in greater QD dissolution, whereas glycine, an amino acid, acts against QD dissolution."
According to the news editors, the research concluded: "Surprisingly, the presence of histidine, an amino acid with an imidazole functional group, leads to the formation of much strong Cd complexes over time, which may be non-labile, inducing variations in the local environment of the QD surface."
For more information on this research see: Stability of core/shell quantum dots--role of pH and small organic ligands. Environmental Science and Pollution Research International, 2013;20(7):4872-80 (see also Environmental Pollution).
The news editors report that additional information may be obtained by contacting R.F. Domingos, Centro de Quimica Estrutural, Instituto Superior Tecnico, Universidade Tecnica de Lisboa, Torre Sul lab 11-63, Av Rovisco Pais # 1, 1049-001 Lisbon, Portugal. Additional authors for this research include C. Franco and J.P Pinheiro.
Keywords for this news article include: Lisbon, Europe, Portugal, Quantum Dots, Quantum Physics, Environmental Pollution.
Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2013, NewsRx LLC