Title

The Effect of Composition and Structure on the Dissolution Rates in Water of Alkali- Alkaline Earth Borate Glasses

Presenter Information

Michaela Kuzara

Department

Materials Science and Engineering

Major

Ceramic Engineering

Research Advisor

Brow, Richard K.
Goetschius, Kathryn

Advisor's Department

Materials Science and Engineering

Funding Source

Center for Biomedical Science and Engineering

Abstract

Fifteen different borate glasses with molar compositions 10X2O·10RO·80 B2O3, 15X2O·15CaO·70B2O3, and 20X2O·20CaO·60B2O3 (where X =Li, Na or K and R =Mg, Ca or Sr) were characterized using NMR, FTIR, and Raman spectroscopies. The fractions of boron tetrahedra (B4) were determined; 0.45 of the borate units in glasses with 60 and 70 mole% B2O3 were tetrahedral, compared to 0.29 in glasses with 80 mole% B2O3. The dissolution rate in 37 °C water was determined from glass powders by measuring the boron release rate using ICP-OES. Dissolution rate constants were determined using a contracting volume model for spherical particles. Glasses with 80 mole% B2O3 (fewer B4 units) dissolved about an order of magnitude faster than glasses with more B4 units. Glasses with greater field strength alkali (Li < Na < K) and alkaline earth (Ca < Sr) ions dissolved 25-50% more slowly; Mg-containing glasses did not follow this field strength trend.

Biography

Michaela is a Senior in Ceramic Engineering from the St. Louis, Missouri area. She has been working with Dr. Brow’s glass research group for about a year and a half, and will be graduating in December. She is involved with Keramos (professional Ceramic Engineering fraternity), the Water Environment Federation (WEF), and Lambda Sigma Pi (women’s community service organization).

Research Category

Engineering

Presentation Type

Poster Presentation

Document Type

Poster

Award

Engineering poster session, First place

Location

Upper Atrium/Hall

Presentation Date

16 Apr 2014, 1:00 pm - 3:00 pm

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Apr 16th, 1:00 PM Apr 16th, 3:00 PM

The Effect of Composition and Structure on the Dissolution Rates in Water of Alkali- Alkaline Earth Borate Glasses

Upper Atrium/Hall

Fifteen different borate glasses with molar compositions 10X2O·10RO·80 B2O3, 15X2O·15CaO·70B2O3, and 20X2O·20CaO·60B2O3 (where X =Li, Na or K and R =Mg, Ca or Sr) were characterized using NMR, FTIR, and Raman spectroscopies. The fractions of boron tetrahedra (B4) were determined; 0.45 of the borate units in glasses with 60 and 70 mole% B2O3 were tetrahedral, compared to 0.29 in glasses with 80 mole% B2O3. The dissolution rate in 37 °C water was determined from glass powders by measuring the boron release rate using ICP-OES. Dissolution rate constants were determined using a contracting volume model for spherical particles. Glasses with 80 mole% B2O3 (fewer B4 units) dissolved about an order of magnitude faster than glasses with more B4 units. Glasses with greater field strength alkali (Li < Na < K) and alkaline earth (Ca < Sr) ions dissolved 25-50% more slowly; Mg-containing glasses did not follow this field strength trend.