NDLI: Strength of hollow hydroxyapatite microspheres prepared by a glass conversion process

Content Provider	Springer Nature Link
Author	Huang, Wenhai Rahaman, Mohamed N. Day, Delbert E. Miller, Brad A.
Copyright Year	2008
Abstract	Hollow hydroxyapatite (HA) microspheres (diameter = 100–800 μm) were prepared by reacting solid Li$_{2}$O–CaO–B$_{2}$O$_{3}$ glass spheres in 0.25 M K$_{2}$HPO$_{4}$ solution at 37°C. The influence of subsequent heating on the microstructure, surface area, and compressive strength of the HA microspheres was evaluated using scanning electron microscopy, the BET method, and nano-mechanical testing. The surface area and rupture strength of the as-prepared microspheres were 135 m$^{2}$/g and 1.6 ± 0.6 MPa, respectively. On heating for 8 h at 600°C, the surface area decreased to 27 m$^{2}$/g, but there was no increase in the compressive strength (1.7 ± 0.4 MPa). Heating to 800°C (8 h) resulted in a marked decrease in the surface area (to 2.6 m$^{2}$/g) and a sharp increase in the compressive strength (to >35 ± 8 MPa). These hollow HA microspheres may be useful as devices for drug or protein growth factor delivery or as scaffolds for engineered tissues.
Starting Page	123
Ending Page	129
Page Count	7
File Format	PDF
ISSN	09574530
Journal	Journal of Materials Science: Materials in Medicine
Volume Number	20
Issue Number	1
e-ISSN	15734838
Language	English
Publisher	Springer US
Publisher Date	2008-08-14
Publisher Place	Boston
Access Restriction	Subscribed
Subject Keyword	Surfaces and Interfaces, Thin Films Characterization and Evaluation of Materials Metallic Materials Ceramics, Glass, Composites, Natural Methods Polymer Sciences Biomaterials
Content Type	Text
Resource Type	Article
Subject	Biomaterials Biophysics Bioengineering Biomedical Engineering

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