title: Study of behavior of carboxylic magnetite core shell nanoparticles on a pH boundary.
abstract: During the last years, several authors have focused on the characterization of the size and charge of the nanoparticles by capillary electrophoresis. However, considering that nanoparticles are generally suspended in a solvent different from those commonly used as background electrolytes (BGE), an appropriate characterization of the behavior of the nanoparticles in the sample-BGE interface is required, as this might affect the overall electrophoretic behavior of the nanoparticles. In the present work, we address the evaluation of the behavior of COOH-coated maghemite nanoparticles in the vicinity of a pH boundary. To do so, different suspensions of nanoparticles prepared in acid media were injected into a borate/NaOH pH 9.5 BGE. The formation and evolution of boundaries in the sample-BGE interface in such systems was modeled by computer simulation. A systematic evaluation of the effect that parameters such as the co-ion, the sample pH or the injection time have on the electrophoretic behavior of the nanoparticles was carried out.
authors.affiliation: Regional Centre of Advanced Technologies and Materials, Department of Analytical Chemistry, Faculty of Science, Palacký University in Olomouc, 17. listopadu 12, 77146 Olomouc, Czech Republic.
authors.forename: Carmen
authors.initials: C
authors.lastname: Cacho
authors.affiliation: Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacký University in Olomouc, Šlechtitelů 11, 78371 Olomouc, Czech Republic.
authors.forename: Zdenka
authors.initials: Z
authors.lastname: Marková
authors.affiliation: Regional Centre of Advanced Technologies and Materials, Department of Analytical Chemistry, Faculty of Science, Palacký University in Olomouc, 17. listopadu 12, 77146 Olomouc, Czech Republic.
authors.forename: Juraj
authors.initials: J
authors.lastname: Ševčík
authors.affiliation: Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacký University in Olomouc, Šlechtitelů 11, 78371 Olomouc, Czech Republic.
authors.forename: Radek
authors.initials: R
authors.lastname: Zbořil
authors.affiliation: Regional Centre of Advanced Technologies and Materials, Department of Analytical Chemistry, Faculty of Science, Palacký University in Olomouc, 17. listopadu 12, 77146 Olomouc, Czech Republic. Electronic address: secjpetr@gmail.com.
authors.forename: Jan
authors.initials: J
authors.lastname: Petr
mesh_terms: D003198:Computer Simulation; D019075:Electrophoresis, Capillary / Q000295:instrumentation; D005290:Ferric Compounds / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D058185:Magnetite Nanoparticles / Q000737:chemistry*
chemical_list: D005290:Ferric Compounds; D058185:Magnetite Nanoparticles; C000499:ferric oxide
keywords: Boundary effects; Dynamic pH junction; Nanoparticles; Stacking; pH boundary