Kovarik, Tomas and Belsky, Petr and Krenek, Tomas and Deshmukh, Kalim and Forejtova, Jana and Medlin, Rostislav and Benes, Jan and Svoboda, Miloss and Kadlec, Jaroslav and Pola, Michal and Jandova, Vera and Mikysek, Petr and Ilavsky, Jan and Stich, Theresia and Docheva, Denitsa and Strejcova, Katerina and Tisler, Zdenek (2024) Sol-gel derived silicate-phosphate glass SiO₂-P₂O₅-CaO-TiO₂: The effect of titanium isopropoxide on porosity and thermomechanical stability. MICROPOROUS AND MESOPOROUS MATERIALS, 374: 113138. ISSN 1387-1811, 1873-3093
Full text not available from this repository. (Request a copy)Abstract
Despite of several decades lasting extensive research of bioactive and bioresorbable glasses the systematic parametrization and determination of the key factors affecting porosity and thermomechanical characteristics still remains challenging. Here, we present silica-phosphate glasses, with the composition 70SiO 2 - 20P 2 O 5 - (10- x )CaO- x TiO 2 (mol%; x = 0, 2.5, 5, and 7.5), prepared by sol -gel method and reinforced by titanium dioxide via titanium isopropoxide (TTIP) incorporation which demonstrated tunable variation of porosity from micro-to macro -region and superb mechanical integrity during the calcination process. The presence of 7.5 mol% TiO 2 promotes dimensional stability up to 1000 degrees C as investigated by thermomechanical analysis. The XRD showed the dominant presence of silicon phosphate [Si(P 2 O 7 )], titanium phosphate [Ti(P 2 O 7 )] and calcium phosphates [ beta- Ca(P 2 O 6 ) and gamma- Ca 2 (P 2 O 7 )]. The effect of TiO 2 doping on the multiscale morphology and porosity was investigated by means of SEM, MIP, mu CT, N 2 adsorption and USAXS/SAXS. Increasing TiO 2 content leads to the formation of open porosity up to 70 vol% and drives the formation of a refined interconnected macroporosity of 2-30 mu m. In contrast, mesoporosity with a dominance of 3-6 nm pores decreases in all samples with increasing TiO 2 content. USAXS/SAXS revealed an increase in primary particle size with increasing TiO 2 content which is in good agreement with the nitrogen physisorption analysis showing that microporosity decreases with increasing TiO2 content.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | IN-VITRO BIOACTIVITY; POROUS SILICA; SCAFFOLDS; BIOCOMPATIBILITY; MONOLITHS; EVOLUTION |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Unfallchirurgie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 10 Dec 2025 05:42 |
| Last Modified: | 10 Dec 2025 05:44 |
| URI: | https://pred.uni-regensburg.de/id/eprint/65297 |
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