Degradation behaviour of non-sintered graphene/barium titanate/magnesium phosphate cement bio-piezoelectric composites. Issue 8 (1st June 2020)

• Record Type: Journal Article
• Authors: Tang, Yufei; Wu, Cong; Zhang, Ping; Zhao, Kang; Wu, Zixiang
• Is Part Of: Ceramics international. Volume 46:Issue 8(2020)Part B
• Page Start: 12626
• Page End: 12636
• Publication Date: 2020-06-01
• Subjects: Bioceramics -- Phosphates -- Barium titanate -- Degradation -- Bio-piezoelectric; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.02.028
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: A sintering-free magnesium phosphate cement (MPC) with an arbitrary shape is potentially used as a bone implant material, especially with complex shapes. However, the high degradation rate of MPC may lead to the degradation of mechanical properties. In this study, graphene (G)/barium titanate (BT)/MPC composites were fabricated by introducing the piezoelectric phase BT and conductive phase G into MPC, which exhibited the piezoelectric effect after polarisation. The negative surface of the composite may attract Ca 2+ and Mg 2+ to mineralise rapidly, thereby reducing and improving its degradation rate and mechanical properties, respectively. The contents of additional G and BT were optimised. When BT and G contents were 50 mol% and 0.5 wt%, respectively, the piezoelectric coefficient of the composites increased to 6.31 pC/N, which is an increase of 421% without the addition of G. The results of in vitro degradation and mineralisation in simulated body fluids (SBF) showed that introducing BT and G could effectively slow down the degradation rate, promote mineralisation on the composite surface, and enhance the impact on bone integration.