Imperial College London
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ProfessorJulianJones

Faculty of Engineering, Department of Materials

Professor of Biomaterials
 
 
 
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Contact

 

+44 (0)20 7594 6749julian.r.jones

 
 
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Location

 

207GoldsmithSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Nommeots-Nomm:2019:10.1016/j.mtadv.2019.100011,
author = {Nommeots-Nomm, A and Ligorio, C and Bodey, AJ and Cai, B and Jones, JR and Lee, PD and Poologasundarampillai, G},
doi = {10.1016/j.mtadv.2019.100011},
journal = {Materials Today Advances},
title = {Four-dimensional imaging and quantification of viscous flow sintering within a 3D printed bioactive glass scaffold using synchrotron X-ray tomography},
url = {http://dx.doi.org/10.1016/j.mtadv.2019.100011},
volume = {2},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Bioglass® was the first material to form a stable chemical bond with human tissue. Since its discovery, a key goal was to produce three-dimensional (3D) porous scaffolds which can host and guide tissue repair, in particular, regeneration of long bone defects resulting from trauma or disease. Producing 3D scaffolds from bioactive glasses is challenging because of crystallization events that occur while the glass particles densify at high temperatures. Bioactive glasses such as the 13–93 composition can be sintered by viscous flow sintering at temperatures above the glass transition onset (Tg) and below the crystallization temperature (Tc). There is, however, very little literature on viscous flow sintering of bioactive glasses, and none of which focuses on the viscous flow sintering of glass scaffolds in four dimensions (4D) (3D + time). Here, high-resolution synchrotron-sourced X-ray computed tomography (sCT) was used to capture and quantify viscous flow sintering of an additively manufactured bioactive glass scaffold in 4D. In situ sCT allowed the simultaneous quantification of individual particle (local) structural changes and the scaffold's (global) dimensional changes during the sintering cycle. Densification, calculated as change in surface area, occurred in three distinct stages, confirming classical sintering theory. Importantly, our observations show for the first time that the local and global contributions to densification are significantly different at each of these stages: local sintering dominates stages 1 and 2, while global sintering is more prevalent in stage 3. During stage 1, small particles coalesced to larger particles because of their higher driving force for viscous flow at lower temperatures, while large angular particles became less faceted (angular regions had a local small radius of curvature). A transition in the rate of sintering was then observed in which significant viscous flow occurred, resulting in large reduction of surfac
AU  - Nommeots-Nomm,A
AU  - Ligorio,C
AU  - Bodey,AJ
AU  - Cai,B
AU  - Jones,JR
AU  - Lee,PD
AU  - Poologasundarampillai,G
DO  - 10.1016/j.mtadv.2019.100011
PY  - 2019///
SN  - 2590-0498
TI  - Four-dimensional imaging and quantification of viscous flow sintering within a 3D printed bioactive glass scaffold using synchrotron X-ray tomography
T2  - Materials Today Advances
UR  - http://dx.doi.org/10.1016/j.mtadv.2019.100011
UR  - http://hdl.handle.net/10044/1/72180
VL  - 2
ER  -
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