Insitu Templating Synthesis of Thermally Stable Hydroxyapatite with Ordered Nanostructures.pdfVIP

Key Engineering Materials Vols. 434-435 (2010) pp 624-626 Online available since 2010/Mar/29 at © (2010) Trans Tech Publications, Switzerland doi:10.4028//KEM.434-435.624 In-situ Templating Synthesis of Thermally Stable Hydroxyapatite with Ordered Nanostructures a b Haifeng Guo , Feng Ye , Xiulan He and Haijiao Zhang Institute for Advanced Ceramics，Harbin Institute of Technolog ，Harbin 150001, China a b guo_iac@, yef306@ Keywords: Hydroxyapatite; ordered nanostructure; thermal stability. Abstract. Alkyl phosphates, the products from the reaction between phosphorous pentoxide and various alcohols, were used as the in-situ templates of nanostructure as well as phosphorus source of HAP. The obtained precursor samples had ordered nanostructures:lamellar structure for dodecyl and n-octyl phospahes templated samples, cubic for n-pentyl and hexagonal for ethyl phosphates templated samples. 2 The calcined ethyl phosphate templated sample was pure HAP with a specific surface area of 42m /g, and sustained with an orderly hexagonal nanostructure at 400°C. But the calcination at 400°C caused the collapse of other alkyl phosphates templated nanostructures. Introduction In the past five years, various hydroxyapatites with lamellar [1, 2], or worm-like [3, 4] or irregular nanostructures [5] have been successfully synthesized using various ionic or nonionic surfactants as the template. But most of these nanostructures collapsed when HAP samples were under a weak heat-treatment (400°C) to completely remove the organic template