Citation: Yin-Chuan WANG, Gui-Yong XIAO, Wei-Li XU, Mei-Li QI, Wen-Xi YAN, Yan-Qiu WU, Yu-Peng LÜ. Effect of Initial Calcium-Phosphorus Molar Ratio on Microstructure of Ultralong Hydroxyapatite Nanofibers[J]. Chinese Journal of Inorganic Chemistry, ;2022, 38(4): 620-628. doi: 10.11862/CJIC.2022.074 shu

Effect of Initial Calcium-Phosphorus Molar Ratio on Microstructure of Ultralong Hydroxyapatite Nanofibers

Yin-Chuan WANG ^{1, 2} ,
Gui-Yong XIAO ^{1, 2,,} ,
Wei-Li XU ^{1, 2} ,
Mei-Li QI ^{3, 4} ,
Wen-Xi YAN ^{1, 2} ,
Yan-Qiu WU ^{1, 2} ,
Yu-Peng LÜ ^{1, 2,,}

1.
Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061, China
2.
School of Materials Science and Engineering, Shandong University, Jinan 250061, China
3.
School of Transportation and Civil Engineering, Shandong Jiaotong University, Jinan 250357, China
4.
National United Engineering Laboratory for Biomedical Material Modification, Dezhou, Shandong 251100, China

Corresponding author: Gui-Yong XIAO, xiaoguiyong@sdu.edu.cn Yu-Peng LÜ, biosdu@sdu.edu.cn
Received Date: 18 October 2021
Revised Date: 22 February 2022

Figures(4)

The nucleation and crystal growth of hydroxyapatite (HA) crystals are closely related to surfactants and the initial calcium - phosphorus molar ratio (n_{Ca, 0}/n_{P, 0}). In this work, HA nanofibers with high flexibility and aspect ratio have been synthesized by using oleic acid as the surfactant. The effect of n_{Ca, 0}/n_{P, 0} on the microstructures of the as - prepared products was investigated by X - ray diffraction (XRD), FTIR, field emission scanning electron microscope (FESEM), and energy-dispersive X-ray spectra (EDS). The formation mechanisms of HA nanofibers were proposed to better explain the effect of oleic and n_{Ca, 0}/n_{P, 0} based on the microstructure evolution. Ultralong HA nanofibers with high crystallinity and flexibility were synthesized with n_{Ca, 0}/n_{P, 0}=0.8 -1.2, but too high and too low n_{Ca, 0}/n_{P, 0} will weaken the effect of oleic acid in inducing the preferential growth of HA along the c axis, which lead to the formation of amorphous knotted or low crystalline nanoneedle bundle-like products, respectively. The preferred growth direction of HA changes from a-axis to c-axis with the decrease of n_{Ca, 0}/n_{P, 0}, but too low n_{Ca, 0}/n_{P, 0} causes HA to tend to grow along the a-axis and c-axis at the same time.
- hydroxyapatite,
- nanofiber,
- oleic acid,
- initial calcium-phosphorus molar ratio
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