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Spectroscopic studies on phosphate-modified silicon oxycarbide-based amorphous materials
Magdalena Gawęda1, Piotr Jeleń2, Maciej Bik2
1NOMATEN CoE, NOMATEN MAB, National Centre for Nuclear Research, A. Soltana 7 Str., 05-400 Otwock-Świerk, Poland.
Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|January 12, 2023
Summary
This study modified silicon oxycarbide (SiOC) glasses with phosphate ions, incorporating aluminum and boron to enhance stability. The resulting materials show promising structural integrity for bioactive coatings.
Area of Science:
- Materials Science
- Ceramics Engineering
- Nanotechnology
Background:
- Silicon oxycarbide (SiOC) glasses are amorphous materials with a silica matrix, crucial for structural analysis.
- Vibrational spectroscopy, including Infrared and Raman spectroscopy, is vital for examining SiOC materials.
- Modifying SiOC glasses with phosphate ions aims to improve their bioperformance for applications like bioactive coatings.
Purpose of the Study:
- To describe the modification of SiOC glasses with phosphate ions using co-doping with aluminum and boron.
- To structurally characterize polymer precursors and derived ceramics (SiPOC, SiPAlOC, SiPBOC) after high-temperature treatment.
- To evaluate the incorporation of modifying ions and the preservation of key structural features like Si-C bonds.
Main Methods:
- Sol-gel synthesis of polymer-derived ceramics based on ladder-like silsesquioxanes.
- Co-doping with phosphate ions along with aluminum (AlPO4) and boron (BPO4) to stabilize the structure.
- Comprehensive structural analysis using Fourier-transformed infrared spectroscopy (FTIR), Raman spectroscopy, X-ray diffraction (XRD), and magic angle spinning nuclear magnetic resonance (MAS-NMR).
Main Results:
- Successful preparation of SiPOC, SiPAlOC, and SiPBOC systems with varying modifier content.
- Obtained materials were X-ray amorphous, exhibiting no phase separation or crystallization, with structural parameters similar to unmodified SiOC.
- Spectroscopic data confirmed the presence of Si-C bonds, successful incorporation of modifying ions, and characterization of the turbostratic free carbon phase.
Conclusions:
- The modification strategy effectively stabilized phosphate ions within the SiOC network, creating stable [AlPO4] and [BPO4] units.
- The structural integrity of the SiOC network, including Si-C bonds and free carbon, was maintained after modification and high-temperature treatment.
- These modified SiOC materials hold potential for application as bioactive coatings on metallic implants due to their improved bioperformance and structural stability.
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