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Aluminum Polyphosphate Nanoparticles: Preparation, Particle Size Determination, and Microchemistry

✍ Scribed by Vitor Augusto do Rego Monteiro; Elizabeth Fátima de Souza; Marcelo Mantovani Martiniano de Azevedo; Fernando Galembeck

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
857 KB
Volume
217
Category
Article
ISSN
0021-9797

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✦ Synopsis

Admixture of aluminum nitrate, sodium polyphosphate, and ammonium hydroxide solutions yields stable dispersions of hydrated aluminum polyphosphate particles within a broad reagent concentration range. These particles are formed by liquid-liquid phase separation, for which a phase diagram was calculated using suitable models for concentrated electrolyte solutions. Particle effective diameters range from a few nanometers to many hundreds and are fractionated by centrifugation. Particle electrophoretic mobility is very low and the hydration degree is high (ϳ80% v/v). Dry nanoparticles (1-to 15-nm diameter as observed by TEM) as well as particle aggregates are obtained by lyophilization. Element (P, Al, and Na) mapping by ESI-TEM shows that particle aggregates have a core-and-shell morphology, with a higher content of P in the aggregate core and a higher Na content at the outer shell.

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