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espanolEn este trabajo, patrones de Dispersion de Rayos-X a Bajos Angulos (SAXS), obtenidos de dos diferentes suspensiones coloidales acuosas de nanoparticulas de magnetita electrostaticamente estabilizadas con acido citrico, fueron ajustados utilizando tres diferentes modelos matematicos, con el fin de describir la distribucion de tamano de particula y estado de agregacion. Las suspensiones coloidales difieren en el tamano medio de particula (4.5±1.0 y 5.5±1.1 nm) y su estabilizacion, permitiendo el control de la intensidad de la interaccion entre particulas. Los modelos utilizados para el analisis de SAXS, revelan que las particulas son cuasi-esfericas con una amplia distribucion de tamanos de particula y que las particulas de las dos suspensiones estan agregadas y bajo un potencial atractivo de interaccion, tipico de nanoparticulas magneticas. Para el coloide mejor estabilizado, se determino que las particulas se organizan en forma de cadenas ramificadas y para la muestra de menor estabilidad se determino una estructura mas compacta. La distribucion de tamanos obtenida usando los modelos matematicos para SAXS se encuentra en acuerdo con la distribucion de tamanos determinada usando Microscopia de Transmision de Electrones (TEM). EnglishIn this work, Small Angle X-ray Scattering (SAXS) patterns, obtained from two different aqueous colloidal suspensions of magnetite nanoparticles electrostatically stabilized with citric acid, were fitted using three different mathematical models in order to describe the particle size distribution and aggregation state. The colloidal suspensions differ in the mean particle size (4.5±1.0 nm and 5.5±1.1 nm) and the aqueous stabilization, allowing control of the strength of the interaction strength between particles. The models used for SAXS analysis, reveal that the particles are almost spherical with a broad size distribution, and that particles in each suspension are aggregated and are subject to an attractive interaction potential, typical for magnetic nanoparticles. For the better-stabilized sample, ramified chain-like aggregates were found, and for the less-stabilized sample, a more compact structure was determined. The size distribution obtained by applying SAXS mathematical models are in agreement with the size distribution determined using Transmission Electronic Microscopy(TEM)

Applying SAXS to study the structuring of Fe3O4 magnetic nanoparticles in colloidal suspensions