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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Preparation and structural characterization of sodium polyphosphate coacervate as a precursor for optical materials

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Author(s):
Franco, D. F. ; Barud, H. S. ; Santagneli, S. ; Lamarca, R. S. ; Santos, Bruno F. ; Silva, M. A. P. ; de Oliveira, L. F. C. ; Ribeiro, S. J. L. ; Nalin, M.
Total Authors: 9
Document type: Journal article
Source: Materials Chemistry and Physics; v. 180, p. 114-121, SEP 1 2016.
Web of Science Citations: 2
Abstract

This paper describes the preparation of Sodium Polyphosphates Coacervates (NaPC) through the direct addition of different methanol molar fractions to a sodium polyphosphate solution. The presence of methanol reduces the dielectric constant medium and it promotes the coacervate formation. Rheology measurement shows that the NaPC viscosity is dependent on a methanol molar fraction, which is caused by the dielectric constant reduction of the water-methanol mixture. Raman spectra for the lyophilized NaPC show that the symmetric P-O-t stretching mode is more sensitive than the symmetric P-O-b stretching mode, due to the approach of the adjacent polyphosphate chains. The P-31 NMR spectra also confirm a decrease in the Q(2)/Q(1) ratio because of the methanol content. Besides, we have obtained transparent soft Glass-Materials to melt NaPC at 800 degrees C. (C) 2016 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass
Grantee:Edgar Dutra Zanotto
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC