Effect of presence of an acid catalyst on structure and properties of iron-doped siloxane-polyoxyethylene nanocomposites prepared by sol-gel
authors Chiavacci, LA; Dahmouche, K; Silva, NJO; Carlos, LD; Amaral, VS; Bermudez, VD; Pulcinelli, SH; Santilli, CV; Briois, V; Craievich, AF
nationality International
journal JOURNAL OF NON-CRYSTALLINE SOLIDS
keywords X-RAY-SCATTERING; NANOPARTICLES
abstract In this work we investigate the effect of hydrochloric acid (HC) addition on the structure and thermal and magnetic properties of iron-doped siloxane-polyoxyethylene (POE) hybrids prepared by the sol-gel route. X-ray powder diffraction (XRD) and X-ray absorption near edge structure (XANES) results reveal the dominance of ferrihydrite nanoparticles and a mixture of this phase with FeCl4- species in the hybrid prepared without and with HCl, respectively. Thermal analysis reveals the existence of two crystalline polymeric phases in the hybrid prepared with HCl whereas hybrids prepared without HCl are amorphous. The 105 and 60 Angstrom sized ferrihydrite nanoparticles were detected by SAXS analysis of the composite prepared without and with HCl, respectively. The magnetic results suggest that in both samples antiferromagnetic nanoparticles coexist with small clusters/isolated ions. In the sample without HCl addition, larger particles dominate the magnetic behavior, while the opposite occurs for the sample prepared using HCl catalyst. (C) 2004 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0022-3093
year published 2004
volume 345
beginning page 585
ending page 590
digital object identifier (doi) 10.1016/j.jnoncrysol.2004.08.089
web of science category Materials Science, Ceramics; Materials Science, Multidisciplinary
subject category Materials Science
unique article identifier WOS:000225583200111
  ciceco authors
  impact metrics
journal analysis (jcr 2019):
journal impact factor 2.929
5 year journal impact factor 2.653
category normalized journal impact factor percentile 71.855
dimensions (citation analysis):
altmetrics (social interaction):



 


Apoio

1suponsers_list_ciceco.jpg