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Type: Artigo de periódico
Title: Aluminum polyphosphate nanoparticles: Preparation, particle size determination, and microchemistry
Author: Monteiro, VAD
de Souza, EF
de Azevedo, MMM
Galembeck, F
Abstract: 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 (similar to 80% 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. (C) 1999 Academic Press.
Subject: aluminum polyphosphates
Country: EUA
Editor: Academic Press Inc Elsevier Science
Rights: fechado
Date Issue: 1999
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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