Coleman, Nichola J. and Li, Qiu (2012) The impact of zirconium oxide radiopacifier on the early hydration behaviour of white Portland cement. Materials Science & Engineering C-Materials for Biological Applications, 33 (1). pp. 427-433. ISSN 0928-4931 (doi:10.1016/j.msec.2012.09.009)

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Abstract

Zirconium oxide has been identified as a candidate radiopacifying agent for use in Portland cement-based biomaterials. During this study, the impact of 20 wt.% zirconium oxide on the hydration and setting reactions of white Portland cement (WPC) was monitored by powder X-ray diffraction (XRD), Si-29 and Al-27 magic angle spinning nuclear magnetic resonance spectroscopy (MAS NMR), transmission electron microscopy (TEM) and Vicat apparatus. The presence of 20 wt.% zirconium oxide particles in the size-range of 0.2 to 5 mu m was found to reduce the initial and final setting times of WPC from 172 to 147 min and 213 to 191 min, respectively. Zirconium oxide did not formally participate in the chemical reactions of the hydrating cement; however, the surface of the zirconium oxide particles presented heterogeneous nucleation sites for the precipitation and growth of the early C-S-H gel products which accelerated the initial setting reactions. The presence of zirconium oxide was found to have little impact on the development of the calcium (sulpho)aluminate hydrate phases. (C) 2012 Elsevier B.V. All rights reserved.

Item Type:	Article
Additional Information:	[1] Received: 19 May 2012. [2] Revised: 29 July 2012. [3] Accepted: 17 September 2012. [4] Available online: 23 September 2012. [5] Published in print: 1 January 2013.
Uncontrolled Keywords:	zirconium oxide, radiopacifier, hydration, white Portland cement
Subjects:	Q Science > QD Chemistry R Medicine > RK Dentistry
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science > School of Science (SCI)
Related URLs:	Publisher
Last Modified:	17 Oct 2016 09:12
URI:	http://gala.gre.ac.uk/id/eprint/11814

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