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Fabrication of Porous Hollow Hydroxyapatite Microspheres with a Facile Gas-Diffusion Method

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Porous hollow hydroxyapatite (HA) microspheres were prepared based on a facile gas-diffusion method that used ethylenediaminetetraaceticaciddiso-diumsalt (Na2EDTA) as a chelating agent. The morphology and structure of the synthesized products were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, laser particle size analyzer and Brunauer-Emmett-Teller gas sorptometry analyses. Results showed that the capability of Na2EDTA to control Ca2+ release and distribution in synthesis solution contributed to the formation of porous hollow structure. The diffusing ammonia to gradually increase the solution pH provided the driving force for the formation of HA crystals. The possible formation mechanism of the microspheres based on time-dependent experiments was proposed. The method provides an easy and controllable route to synthesize HA microsphere with hollow structure. Moreover, the porous hollow HA microsphere with high surface area and porosity has great potential applications.
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Keywords: CRYSTAL GROWTH; DIFFUSION; HYDROXYAPATITE; MICROSTRUCTURE

Document Type: Research Article

Publication date: October 1, 2018

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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