title: Synthesis and characterization of needlelike apatitic nanocomposite with controlled aspect ratios.
abstract: Calcium-deficient apatitic (cd-HA) crystals with core-shell nanostructure with needlelike shape, 5-10nm in diameter and 20-80nm in length, were prepared via an in situ formation in the presence of polyacrylic acid (PAA) under aqueous solution of different pH values, ranging from 9 to 11. Nanostructure of the resulting crystals showing a core-shell configuration with a thin layer of PAA shell of about 1nm thickness was investigated. Aspect ratio (AR) of the needlelike composite was found to depend on the concentration of the PAA and solution pH. At lower solution pH, crystal growth was inhibited, i.e., leading to a decreased AR, with increase of PAA concentration, while an increased AR was detected at higher solution pH, suggesting a preferential growth of the cd-HA nanocrystals. Mechanism of such preferential growth was tentatively proposed and is suggested to correct PAA adsorption along the long axis of the needlelike nanoparticles.
authors.affiliation: Department of Materials Science and Engineering, National Chiao-Tung University, 1001 Ta-hsueh Road, Hsinchu, Taiwan 300, ROC.
authors.forename: Sz-Chian
authors.initials: SC
authors.lastname: Liou
authors.forename: San-Yuan
authors.initials: SY
authors.lastname: Chen
authors.forename: Dean-Mo
authors.initials: DM
authors.lastname: Liu
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D001672:Biocompatible Materials; D002118:Calcium / Q000737:chemistry; D003460:Crystallization; D004305:Dose-Response Relationship, Drug; D017886:Durapatite / Q000138:chemical synthesis / Q000737:chemistry*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008854:Microscopy, Electron; D036103:Nanotechnology; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D013997:Time Factors; D014961:X-Ray Diffraction
chemical_list: D000180:Acrylic Resins; D001672:Biocompatible Materials; C006903:carbopol 940; D017886:Durapatite; D002118:Calcium