Polyelectrolyte assisted charge titration spectrometry: Applications to latex and oxide nanoparticles
Idioma
en
Article de revue
Este ítem está publicado en
Journal of Colloid and Interface Science. 2016-08, vol. 475, p. 36-45
Elsevier
Resumen en inglés
The electrostatic charge density of particles is of paramount importance for the control of the dispersion stability. Conventional methods use potentiometric, conductometric or turbidity titration but require large amount ...Leer más >
The electrostatic charge density of particles is of paramount importance for the control of the dispersion stability. Conventional methods use potentiometric, conductometric or turbidity titration but require large amount of samples. Here we report a simple and cost-effective method called polyelectrolyte assisted charge titration spectrometry or PACTS. The technique takes advantage of the propensity of oppositely charged polymers and particles to assemble upon mixing, leading to aggregation or phase separation. The mixed dispersions exhibit a maximum in light scattering as a function of the volumetric ratio X, and the peak position XMax is linked to the particle charge density according to σ∼D0XMax where D0 is the particle diameter. The PACTS is successfully applied to organic latex, aluminum and silicon oxide particles of positive or negative charge using poly(diallyldimethylammonium chloride) and poly(sodium 4-styrenesulfonate). The protocol is also optimized with respect to important parameters such as pH and concentration, and to the polyelectrolyte molecular weight. The advant< Leer menos
Palabras clave en inglés
Charge density
Light scattering
Nanoparticles
Polyelectrolyte complex
Proyecto ANR
Assemblage Macromoléculaire Hors-équilibre Compréhension, Contrôle & nouvelles structures - ANR-13-BS08-0015
Orígen
Importado de HalCentros de investigación