resumo
The preparation of PDMS-TEOS-CaO hybrid materials by sol-gel techniques has been widely described in previous works. Calcium nitrate is the most common source of calcium used in these preparations. However, to remove possible toxic nitrate by-products a thermal treatment is necessary at temperatures above 500 degrees C, which leads to the degradation of the polymeric components of the hybrids. Strontium has already shown some promising results in the therapeutic area, being used in cases of osteoporosis and low bone density. In this study a new potential bioactive hybrid material was prepared, by sol-gel techniques, using calcium acetate as a novel calcium source. Also, for the first time, incorporation of strontium in a PDMS-TEOS hybrid system was evaluated. Samples were characterized before and after immersion in Kokubo's Simulated Body Fluid (SBF) by SEM, EDS, ICP and FT-IR spectroscopy. (C) 2012 Elsevier B.V. All rights reserved.
palavras-chave
IN-VITRO; FT-IR; RANELATE; BIOACTIVITY; HYDROLYSIS; DRUG
categoria
Materials Science; Physics
autores
Castro, AGB; Almeida, JC; Salvado, IMM; Margaca, FMA; Fernandes, MHV
nossos autores
Isabel Margarida Miranda Salvado
Professor associado
José Carlos Martins de Almeida
Investigador Júnior
Maria Helena Figueira Vaz Fernandes
Professor(a) Jubilado(a)Grupos
G3 - Materiais Eletroquímicos, Interfaces e Revestimentos
G5 - Materiais Biomiméticos, Biológicos e Vivos
agradecimentos
This work is financed by FEDER funds, through the Program COMPETE, and by FCT (Fundacao para a Ciencia e Tecnologia) funds, on the project PTDC/CTM/101115/2008 and by the grant SFRH/BD/72074/2010. We also want to acknowledge the program which is financing CICECO at present, Pest-C/CTM/LA0011/2011.