Template-directed hydrothermal synthesis of dandelion-like hydroxyapatite in the presence of cetyltrimethylammonium bromide and polyethylene glycol

AbstractA template-directed synthetic method, using surfactant cetyltrimethylammonium bromide (CTAB) as a template and co-surfactant poly-ethyleneglycol(PEG600)asaco-templateunderhydrothermalconditions,hasbeenappliedtoobtaindandelion-like HAp.Themorphology,size,crystalline phase, chemical composition, physical characteristics, and thermal behavior of the product were characterized by scanning electronmicroscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD), Fourier ransform infrared spectroscopy (FTIR),induced coupled plasma spectroscopy (ICP), BET (Brunauer, Emmett, and Teller) method, and simultaneous thermal analysis (STA). SEM andTEM observations showed in the presence of CTAB and a certain concentration of PEG600 (30%) HAp crystals have a uniform dandelion-likemorphologywithadiameterofabout80–150 nmandaspectratioofabout20foreachtooth.Dandelion-likeHApcrystalshaveahighsurfaceareaof 88 m 2 g 1 showing potential applications. The template action of CTAB and co-template action of PEG600 are also discussed.# 2009 Elsevier Ltd and Techna Group S.r.l. All rights reserved.