Doctoral Dissertations

Abstract

"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

Advisor(s)

Brow, Richard K.

Committee Member(s)

Convertine, Anthony J.
Moats, Michael S.
Schlesinger, Mark E.
Switzer, Jay A., 1950-

Department(s)

Materials Science and Engineering

Degree Name

Ph. D. in Materials Science and Engineering

Publisher

Missouri University of Science and Technology

Publication Date

Spring 2023

Pagination

xv, 189 pages

Note about bibliography

Includes_bibliographical_references_(pages 181-188)

Rights

© 2023 Parker Tracy Freudenberger, Alll Rights Reserved

Document Type

Dissertation - Open Access

File Type

text

Language

English

Thesis Number

T 12245

Electronic OCLC #

1426051594

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