Aqueous Preparation of Highly Dispersed Hydroxyapatite Nanorods for Colloidal Liquid Crystals
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2021年第2期
论文作者：熊焰 TAN Peng LIU Qi 谭军军
文章页码：230 - 238
摘 要：Hydroxyapatite （HA） nanorods were synthesized using a citrate-assisted hydrothermal method.NaH2PO4,Na2HPO4,and Na3PO4 were used as the phosphate sources and the influences of pH value were investigated.The XRD results show that pure hexagonal HA can be synthesized using Na3PO4·12H2O as the phosphate source with the citrate solution pH ranging from 5.0 to 7.6.The zeta potential evaluation demonstrates that as-synthesized HA nanorods are colloidally stable and the aqueous dispersion can be maintained homogenous without any sediment or creaming for more than at least a month.The Ca/P molar ratio of the HA nanorods is about 1.60,indicating that the HA nanorods are calcium-deficient hydroxyapatite.Besides,owing to the excellent colloidal stability and rod-like morphology with a high aspect ratio （>6）,the HA aqueous dispersion undergoes a phase transition from an isotropic state to a liquid crystalline state upon increasing the particle concentration to 17wt%.The completely liquid crystalline phase forms when the particle concentration reaches above 30wt%.
熊焰1，TAN Peng1，LIU Qi2，谭军军1
1. Hubei Provincial Key Laboratory of Green Materials for Light Industry, Hubei University of Technology2. Jiangxi Provincial Engineering Research Center for Multifunction Zirconia Materials, Jiangxi Size Materials Co., Ltd
摘 要：Hydroxyapatite （HA） nanorods were synthesized using a citrate-assisted hydrothermal method.NaH2PO4,Na2HPO4,and Na3PO4 were used as the phosphate sources and the influences of pH value were investigated.The XRD results show that pure hexagonal HA can be synthesized using Na3PO4·12H2O as the phosphate source with the citrate solution pH ranging from 5.0 to 7.6.The zeta potential evaluation demonstrates that as-synthesized HA nanorods are colloidally stable and the aqueous dispersion can be maintained homogenous without any sediment or creaming for more than at least a month.The Ca/P molar ratio of the HA nanorods is about 1.60,indicating that the HA nanorods are calcium-deficient hydroxyapatite.Besides,owing to the excellent colloidal stability and rod-like morphology with a high aspect ratio （>6）,the HA aqueous dispersion undergoes a phase transition from an isotropic state to a liquid crystalline state upon increasing the particle concentration to 17wt%.The completely liquid crystalline phase forms when the particle concentration reaches above 30wt%.
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