Preparation and mechanism of hydroxyapatite hollow microspheres with different surface charge by biomimetic method

• Published in: Journal of materials science. Materials in medicine Vol. 31; no. 5; p. 47
• Main Authors: Yang, Xiuying, Tian, Zhenzhen, Guo, Kebing, Lu, Ting, Ji, Jingou, Hao, Shilei, Xiao, Shangyou
• Format: Journal Article
• Language: English
• Published: New York Springer US 10.05.2020; Springer Nature B.V
• Subjects: Biomaterials; Biomaterials Synthesis and Characterization; Biomedical Engineering and Bioengineering; Biomedical materials; Biomimetics; Calcium; Ceramics; Chemistry and Materials Science; Composites; Drug Delivery Systems; Durapatite - chemistry; Glass; Hydroxyapatite; Materials Science; Microscopy, Electron, Scanning; Microspheres; Morphology; Nanoparticles; Nanoparticles - chemistry; Natural Materials; Nutrient deficiency; Polyethylene glycol; Polyethylene Glycols; Polymer Sciences; Regenerative Medicine/Tissue Engineering; Scanning electron microscopy; Surface charge; Surface Properties; Surfaces and Interfaces; Thin Films; X ray powder diffraction; X-Ray Diffraction
• ISSN: 0957-4530; 1573-4838
• DOI: 10.1007/s10856-020-06385-7

To meet the different application requirements in various fields, hydroxyapatite (HA) hollow microspheres with different surface charge were synthesized successfully by biomimetic method using Ca(NO 3 ) 2 ·4H 2 O and (NH 4 ) 2 HPO 4 in the presence of polyethylene glycol (PEG). Scanning electron microscopy (SEM), High-resolution TEM (HRTEM), X-ray powder diffraction (XRD), and Zeta PALS were used to characterize the obtained samples. The results indicated that the concentration of PEG and temperature significantly affect the morphology of the obtained samples. After incubation for 5 d, the HA hollow microspheres with positive surface charge, HA spherical nanoparticles with surface charge close to zero and calcium deficiency HA (d-HA) hollow microspheres with negative surface charge were obtained respectively in the presence of 5% PEG, 6% PEG and 7% PEG at 15 °C. Brunauer-Emmett-Teller (BET) revealed that the specific surface area of HA hollow microspheres reached 98.50 m 2 /g, while that of HA spherical nanoparticles were only 4.12 m 2 /g, hollow microspheres show a better application prospect. The possible formation mechanism was also discussed. Ca/P molar ratio >1.67, the surface charge of HA hollow microspheres inclines to be positive. Ca/P molar ratio <1.67, the surface charge of d-HA hollow microspheres tends to be negative.