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Dispersion Properties of an Alumina Nanopowder Using Molecular, Polyelectrolyte, and Steric Stabilization

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A commercial alumina nanopowder was characterized and its dispersion was studied using electrostatic, electrosteric, and steric surfactants. Citric acid was used as the electrostatic dispersant, ammonium polymethacrylic acid (Darvan C) as the electrosteric dispersant, and Hypermer KD-1 in α-terpineol as a purely steric system. Phase stability in water was examined by X-ray diffraction, and the surface chemistry was characterized by zeta potential and isoelectric points. Rheology measurements were used to study the impact of each dispersant type on maximum solids loading, with the maximum loading being achieved for the polyelectrolyte dispersant. Differences in maximum solids loading are related to the excluded volume of the particle separation distance induced by each stabilizing interaction.
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Document Type: Research Article

Publication date: 01 March 2004

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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