Phosphate and Borophosphate Glasses for optical and Biomedical Applications

<p>"The goal of this work was to connect the network structures of phosphate and borophosphate glasses to the compositional dependence of properties related to biomedical applications. The glasses were characterized by a variety of techniques, including phosphate ion chromatography, Raman spectroscopy, and ¹¹B and ³¹P Magic Angle Spinning Nuclear Magnetic Resonance spectroscopy, which provide qualitative and quantitative information about the phosphate and borate moieties that constitute the network structures. The systematic addition of borate to a phosphate glass initially creates tetrahedral borate sites that replace P-O-P linkages with B-O-P linkages, and the properties of the resulting borophosphate glasses can be understood by modeling the number of bridging oxygen linkages between the borate and phosphate units; there are systematic increases in glass transition temperature with increases in the number of bridging oxygens per network former. The network structure also affects the dissolution rates of the glasses, but the nature of the crosslinking bonds is more important than their numbers. The substitution of SrO for CaO also decreases the dissolution rates of both Na-Ca/Sr-metaphosphate glasses as well as the borophosphate glasses, which are of interest for the use in biomedical applications. Finally, the systematic substitution of P₂O₅ for B₂O₃ in a series of Na-Ca/Sr-borophosphate glasses affects the dissolution rates of the glass in simulated body fluid, the pH of the SBF, and the nature of the phosphate phases that precipitate on the glass surface. It remains to be seen if these bioactive responses could be used to design new biomedical devices"--Abstract, p. iv</p>

Name thesis:degree_name

Ph. D. in Materials Science and Engineering

Grantor

Missouri University of Science and Technology

Author dc:creator

• Freudenberger, Parker Tracy

• Materials Science and Engineering

Repository record dc:identifier

https://scholarsmine.mst.edu/doctoral_dissertations/3258

OAI identifier oai:identifier

oai:scholarsmine.mst.edu:doctoral_dissertations-4263