Please use this identifier to cite or link to this item:
|Title:||Nanosized hydroxyapatite powders from microemulsions and emulsions stabilized by a biodegradable surfactant|
|Source:||Lim, G.K., Wang, J., Ng, S.C., Gan, L.M. (1999). Nanosized hydroxyapatite powders from microemulsions and emulsions stabilized by a biodegradable surfactant. Journal of Materials Chemistry 9 (7) : 1635-1639. ScholarBank@NUS Repository. https://doi.org/10.1039/a809644i|
|Abstract:||Ultrafine hydroxyapatite powders have been successfully synthesized in inverse microemulsions and emulsions consisting of petroleum ether as the oil phase, 1.0 M CaCl2 solution as the aqueous phase and biodegradable KB6ZA as the surfactant. The titration of 0.6 M (NH4)2HPO4 aqueous solution into the inverse microemulsion and emulsions containing 25.0 and 35.0 wt% aqueous phase, resulted in hydroxyapatite precursors that were nanometer sized and more or less spherical in morphology. However, they underwent a considerable degree of particle coarsening when calcined at 650 °C for 6 h. A nanocrystalline hydroxyapatite powder, which exhibited a dendritic agglomerate morphology, was synthesized in an oil-in-water emulsion containing 90.0 wt% aqueous phase. It shows an average particle size of 25 nm upon calcination at 650 °C for 6 h, as little particle coarsening and growth in crystallite size were observed at the calcination temperature. The inverse microemulsion- and emulsion-derived hydroxyapatites exhibit a degree of type B carbonate substitution, which cannot be eliminated by calcination in air at 650 °C.|
|Source Title:||Journal of Materials Chemistry|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Feb 22, 2018
WEB OF SCIENCETM
checked on Jan 22, 2018
checked on Feb 25, 2018
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.