Structural characterization of PDMS-TEOS-CaO-TiO2 hybrid materials obtained by sol-gel
authors Almeida, JC; Castro, AGB; Lancastre, JJH; Salvado, IMM; Margaca, FMA; Fernandes, MHV; Ferreira, LM; Casimiro, MH
nationality International
journal MATERIALS CHEMISTRY AND PHYSICS
author keywords B. Sol-gel growth; C. Fourier transform infrared spectroscopy (FTIR); C. Nuclear magnetic resonance (NMR); C. Thermogravimetric analysis (TGA)
keywords ORGANICALLY MODIFIED SILICATE; NUCLEAR-MAGNETIC-RESONANCE; SILOXANE-OXIDE MATERIALS; STATE SI-29 NMR; FT-IR; ORMOSILS; TEOS; NANOCOMPOSITES; DEGRADATION; TEMPERATURE
abstract Hybrid materials of the polydimethylsiloxane (PDMS)-Tetraethyl orthosilicate (TEOS) system have already been widely described by several authors, being their potential for biological applications largely studied. For some bone related applications, the addition of Ca to these systems is commonly accepted as necessary for the enhancement of bioactivity. However Ca is commonly introduced in the form of calcium nitrate, which requires a heat treatment step in order to eliminate the nitrate residues. The aim of the present work is to produce a PDMS-SiO2-CaO-TiO2 hybrid material through a sol-gel process, for potential biomedical applications. Calcium nitrate was used as the calcium source and to avoid the presence of nitrate residues in the final product, a heat-treating step at 400 degrees C was performed. Titanium was added to the hybrid system in order to enhance the thermal stability of the materials subjected to this temperature. TGA, FT-IR and Si-29 NMR techniques were used to understand the role of the calcium and titanium in the structure formation, and the way they influence the thermal stability of the PDMS -SiO2 system. A final material containing calcium, with no traces of nitrate and the maintenance of a significant amount of methyl groups was successfully obtained. (C) 2013 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE SA
issn 0254-0584
year published 2014
volume 143
issue 2
beginning page 557
ending page 563
digital object identifier (doi) 10.1016/j.matchemphys.2013.09.032
web of science category Materials Science, Multidisciplinary
subject category Materials Science
unique article identifier WOS:000329888300014
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journal impact factor 2.210
5 year journal impact factor 2.296
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