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Atomic and vibrational origins of mechanical toughness in bioactive cement during setting
Tian, Kun V. Yang, Bin Yue, Yuan-Zheng Bowron, Daniel T. Mayers, Jerry Donnan, Robert S. Dobo-Nagy, Csaba Nicholson, John W. Greer, A. Lindsay Chass, Gregory A.
Tian, Kun V.
Yang, Bin
Yue, Yuan-Zheng
Bowron, Daniel T.
Mayers, Jerry
Donnan, Robert S.
Dobo-Nagy, Csaba
Nicholson, John W.
Greer, A. Lindsay
Chass, Gregory A.
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Other Contributors
EPub Date
Publication Date
2015-11-09
Submitted Date
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Abstract
Bioactive glass ionomer cements (GICs) have been in widespread use for ~40 years in dentistry and medicine. However, these composites fall short of the toughness needed for permanent implants. Significant impediment to improvement has been the requisite use of conventional destructive mechanical testing, which is necessarily retrospective. Here we show quantitatively, through the novel use of calorimetry, terahertz (THz) spectroscopy and neutron scattering, how GIC’s developing fracture toughness during setting is related to interfacial THz dynamics, changing atomic cohesion and fluctuating interfacial configurations. Contrary to convention, we find setting is non-monotonic, characterized by abrupt features not previously detected, including a glass–polymer coupling point, an early setting point, where decreasing toughness unexpectedly recovers, followed by stress-induced weakening of interfaces. Subsequently, toughness declines asymptotically to long-term fracture test values. We expect the insight afforded by these in situ non-destructive techniques will assist in raising understanding of the setting mechanisms and associated dynamics of cementitious materials.
Citation
Tian, K. V., Yang, B., Yue, Y., Bowron, D. T., Mayers, J., Donnan, R. S., . . . Greaves, G. N. (2015). Atomic and vibrational origins of mechanical toughness in bioactive cement during setting. Nature Communications, 6, 8631.
Publisher
Nature Publishing Group
Journal
Nature Communications
Research Unit
DOI
10.1038/ncomms9631
PubMed ID
PubMed Central ID
Type
Article
Language
en
Description
Series/Report no.
ISSN
EISSN
2041-1723