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Microwave-assisted solution combustion synthesis of high aspect ratiocalcium phosphate nanoparticles
Published online by Cambridge University Press: 13 November 2013
Abstract
Calcium phosphates (CaPs) are major chemical constituents of mammalian bone.Their osteoconductivity in vitro and in vivo has encouraged their use inbiomaterial applications such as implant materials and drug delivery. Highaspect ratio nanoparticles are attractive for many biomedical applications;however, precise control of the phase and morphology is challenging. The impactof fuel-to-oxidant ratio, pH, and cation chemistry on morphology and phase wasstudied for CaP-based compositions by microwave-assisted solution combustionsynthesis (MASCS) in a urea–nitrate (fuel–oxidant) system.An initial calcium to phosphate ratio of 1.5 was used. Highly crystallinehydroxyapatite (HA) and biphasic CaP nanoparticle compositions were produced asconfirmed by x-ray diffraction, scanning electron microscopy, and transmissionelectron microscopy. MASCS was capable of synthesizing high aspect ratio(∼5 to 20) single and biphasic CaP nanoparticles with diametersranging from 250 to 500 nm and lengths between 2 and 10 μm.
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