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Type: Artigo de periódico
Title: Calcium and iron(III) polyphosphate gel formation and aging
Author: Masson, NC
deSouza, EF
Galembeck, F
Abstract: Admixture of aqueous solutions of sodium polyphosphate, calcium and iron(III) nitrates leads to gel formation under many experimental conditions (reagents concentrations, temperature). The amounts of gels formed, as well as the amounts of supernatant and syneresis liquids, were determined gravimetrically. The contents of the solids obtained from the gels and from the excluded liquids were determined by X-ray EDS microprobe analysis. Gel yield and composition depend strongly on the relative amounts of reagents used. Sodium and nitrate ion contents within the gels are unexpectedly large in many cases. These results are interpreted assuming that gel formation is the result of a liquid-liquid phase separation, analogous to that observed in bicontinuous microemulsions. (C) 1997 Elsevier Science B.V.
Subject: gels
ionic aggregation
phase separation
Country: Holanda
Editor: Elsevier Science Bv
Citation: Colloids And Surfaces A-physicochemical And Engineering Aspects. Elsevier Science Bv, v. 121, n. 41700, n. 247, n. 255, 1997.
Rights: fechado
Identifier DOI: 10.1016/S0927-7757(96)03985-4
Date Issue: 1997
Appears in Collections:Unicamp - Artigos e Outros Documentos

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