1. Evaluating structural and microstructural changes of PDMS-SiO2 hybrid materials after sterilization by gamma irradiation
- Author
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Isabel M. Miranda Salvado, J. Carlos Almeida, M. Helena Vaz Fernandes, Fernanda M.A. Margaça, J.J.H. Lancastre, and Luís M. A. Ferreira
- Subjects
Materials science ,Bioengineering ,02 engineering and technology ,Gamma irradiation ,010402 general chemistry ,01 natural sciences ,SILOXANE ,Biomaterials ,Materials Science(all) ,Forensic engineering ,Dimethylpolysiloxanes ,NUCLEAR-MAGNETIC-RESONANCE ,Thermal analysis ,Sterility assurance level ,Microstructure ,SI-29 NMR ,Mechanical Engineering ,TEOS ,Biomaterial ,Sterilization ,Structure ,IN-VITRO ,Sterilization (microbiology) ,Condensed Matter Physics ,021001 nanoscience & nanotechnology ,Silicon Dioxide ,NANOCOMPOSITES ,HYDROLYSIS ,0104 chemical sciences ,MODIFIED CAO-SIO2-TIO2 HYBRIDS ,FT-IR ,Mechanics of Materials ,Gamma Rays ,Hybrid system ,POLYDIMETHYLSILOXANE ,Drug delivery ,Hybrid materials ,0210 nano-technology ,Hybrid material ,Biomedical engineering - Abstract
PDMS-SiO2 hybrid materials obtained by sol-gel process have been extensively studied over the past years due to its promising biomedical applications namely as bone substitutes, catheters, and drug delivery devices. Regardless of the intended biomedical application, all these materials should go through a sterilization process before interfacing with a living structure. However, it is unclear whether they undergo structural and microstructural changes when subjected to sterilization by gamma irradiation. This paper addresses this issue by showing that a sol-gel processed biomaterial based on the PDMS-CaO-SiO2 hybrid system suffers only small structural changes when submitted to a radiation dose of 25 kGy, the dose usually recommended to achieve a Sterility Assurance Level of 10(-6) when the natural contamination level and microorganism types cannot be calculated. The characterization was assessed by FT-IR, Si-29-{H-1} CP-MAS, thermal analysis (DTG), and SEM. (C) 2014 Elsevier B.V. All rights reserved.
- Published
- 2015