Preparation of Sr-substituted Hydroxyapatite Nanorods for Liquid Crystal Phase Transition
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2020年第2期
论文作者：熊焰 ZHANG Yucheng LIU Wei LIU Yang 谭军军
文章页码：441 - 448
摘 要：A citrate-assisted hydrothermal method was utilized for the preparation of Sr-substituted hydroxyapatite （HA） nanoparticles.The influences of Sr-substituting degree on the phase identifications,microstructures and colloidal stability of the resultant products were studied.The experimental results show that the crystalline structures and morphologies of final resultants are significantly changed by controlling the Sr-substituting degree.As the Sr-substituting degree increases,the colloidal stability of samples first increases and then decreases rapidly;the morphology of the product first changes from nanorods to short nanorods rod and then becomes nanowires.Uniform HA hexagonal nanorods with high aspect ratio （>4.0） and excellent aqueous colloidal stability were prepared by 6 h hydrothermal reaction at 180℃ without Sr substitution.The dispersion underwent the phase transition from isotropic to liquid-crystalline state upon the increasing concentration of25wt% and the complete liquid-crystalline phase was achieved when at the concentration above 31wt%.These novel findings provide new insights into the role of Sr substitution on both the citrate-assisted hydroxyapatite crystallization and tailoring of colloidal stability.Moreover,HA liquid crystal behavior was successfully observed,which lays a foundation for the fabrication of macroscopically assembled hydroxyapatite-based biomimetic materials for biomedical applications.
熊焰，ZHANG Yucheng，LIU Wei，LIU Yang，谭军军
Hubei Province Key Laboratory of Green Materials for Light Industry, Collaborative Innovation Center for Green Light-weight Materials and Processing, Hubei University of Technology
摘 要：A citrate-assisted hydrothermal method was utilized for the preparation of Sr-substituted hydroxyapatite （HA） nanoparticles.The influences of Sr-substituting degree on the phase identifications,microstructures and colloidal stability of the resultant products were studied.The experimental results show that the crystalline structures and morphologies of final resultants are significantly changed by controlling the Sr-substituting degree.As the Sr-substituting degree increases,the colloidal stability of samples first increases and then decreases rapidly;the morphology of the product first changes from nanorods to short nanorods rod and then becomes nanowires.Uniform HA hexagonal nanorods with high aspect ratio （>4.0） and excellent aqueous colloidal stability were prepared by 6 h hydrothermal reaction at 180℃ without Sr substitution.The dispersion underwent the phase transition from isotropic to liquid-crystalline state upon the increasing concentration of25wt% and the complete liquid-crystalline phase was achieved when at the concentration above 31wt%.These novel findings provide new insights into the role of Sr substitution on both the citrate-assisted hydroxyapatite crystallization and tailoring of colloidal stability.Moreover,HA liquid crystal behavior was successfully observed,which lays a foundation for the fabrication of macroscopically assembled hydroxyapatite-based biomimetic materials for biomedical applications.
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