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|Type:||Artigo de periódico|
|Title:||Aluminum Polyphosphate Nanoparticles: Preparation, Particle Size Determination, And Microchemistry.|
|Author:||do Rego Monteiro VA,|
de Souza EF,
de Azevedo MM,
|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 ( approximately 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. Copyright 1999 Academic Press.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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