Dr. Tagide deCarvalho Profile

Dr. Tagide deCarvalho

at Univ of Maryland Baltimore County

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SPIE Journal Paper | 19 March 2024

Effect of high-energy radiation on the electrical and optical characteristics of bioactive glasses

Aria Tauraso, Krishna Machuga, Joel McAdams, Ching Hua Su, Brian Cullum, Tagide deCarvalho, Narasimha Prasad, Bradley Arnold, Fow-Sen Choa, Kamdeo Mandal, Narsingh Bahadur Singh

OE, Vol. 63, Issue 03, 037105, (March 2024) https://doi.org/10.1117/12.10.1117/1.OE.63.3.037105

KEYWORDS: Glasses, Radiation effects, Dielectrics, Titanium, Mixtures, Selenium, Silicates, Phosphates, Oxides, Crystals

Read Abstract +

SignificanceThe glassy and crystalline hydroxyapatites that affect the metabolic processes such as tissue growth and healing are affected by the electrical, electrochemical, and optical properties investigated in this study.AimThe aim of the present study is to determine effects of high-energy radiation and impurities on the electrical and optical properties of hydroxyapatites responsible for tissue growth and tendency of glass forming ability.ApproachThe approach of the study involves synthesis using carbonates, oxides, silicates, phosphates, and borates of parent materials using elevated temperature and low-temperature flux process. High-energy radiation effects were studied by exposing hydroxyapatites with 5 μCi Cs137 γ- ray source. Morphology was studied to determine dissolution and glass formation of additives such as titanium, gallium, and selenium.ResultsIrradiation of silicate bio glasses showed huge effects on the electrical characteristics, such as dielectric constant (hence polarity) and resistivity of the materials while optical properties showed insignificant changes. Morphological studies showed transition of faceted to nonfaceted structure.ConclusionExposure for the bias voltage of 50 to 1000 mV in the range of 100 to 100000 Hz frequency range showed a large decrease in the dielectric constant and increase in resistivity. The IR and Raman spectra for irradiated glasses exposed for 24 h showed a small change. Morphological results showed that substitution of gallium, magnesium, and /or titanium affects the transition to the glass formation. The addition of selenium showed enormous potential to improve the mixing and glass formation without titanium and gallium precipitates in the matrix.

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