DOI: 10.5176/2251-1n857_M318.49
Authors: Maros Halama, Malgorzata Makowska Janusik, Lucia Mydlova, Alexandra Kovalcikova, Gabriela Baranova, Janette Brezinova
Abstract: Electrochemical measurements and quantum chemical calculations of Ag nanoparticles and Ag nanoparticles/ascorbic acid hybrid system were performed. An assessment of dissolution rate from measured corrosion parameters for both unmodified and modified nanoparticles was determined in Hank solution as simulated human body fluid. The dramatic change of redox behaviour for Ag nanoparticles was observed in addition of molecules of ascorbic acid (AsA) into the solution. In addition, inhibition effect for dissolution of Ag NPs anchored by AsA was theoretically proofed also by performing quantum chemical calculations of oxidation properties of studied hybrid system. The quantum-chemical calculation has showed that the electrons are mainly transferred from AsA molecule to nanoparticle and the free radicals are suppressed. The aim is to highlight problem related with opening “Pandora´s box” regarding reactivity of NPs and their interaction with environment due to the changes of redox properties by surface modification, to study unknown thermodynamics, corrosion of nanoobjects and finally assessment of the life-time of applied NPs. This is important step to prevent against undesirable consequences of NPs contributing metabolic pathways in human body, human health but also prevent environment etc.
Keywords: nanosafety; sensor; corrosion; life-time; prediction
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