Atomic and vibrational origins of mechanical toughness in bioactive cement during setting
Authors
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.
Greaves, G. Neville
Fang, De-Cai
Affiliation
Semmelweis University; University of Chester; Queen Mary University of LondonPublication Date
2015-11-09
Metadata
Show full item recordAbstract
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 GroupJournal
Nature CommunicationsType
ArticleLanguage
enEISSN
2041-1723ae974a485f413a2113503eed53cd6c53
10.1038/ncomms9631
Scopus Count
Collections
The following license files are associated with this item:
- Creative Commons