title: Preparation of low-crystalline apatite nanoparticles and their coating onto quartz substrates.
abstract: We prepared low-crystalline apatite nanoparticles and coated them onto a surface of a Au/Cr-plated quartz substrate by the electrophoretic deposition (EPD) method or by using a self-assembled monolayer of 11-mercaptoundecanoic acid (SAM method). Low-crystalline apatite nanoparticles around 10 nm in size with extremely low contents of undesirable residual products were obtained by adding (NH(4))(2)HPO(4) aqueous droplets into a modified synthetic body fluid solution that contained Ca(CH(3)COO)(2). The apatite nanoparticles were successfully coated by either the EPD method or the SAM method; the nanoparticle coating achieved by the SAM method was more uniform than that achieved by the EPD method. The present SAM method is expected to be a promising technique for obtaining a quartz substrate coated with apatite nanoparticles, which can be used as a quartz crystal microbalance device.
authors.affiliation: Graduate School of Biomedical Engineering, Tohoku University, Aoba-ku, Sendai, Japan. m-kawa@ecei.tohoku.ac.jp
authors.forename: Masakazu
authors.initials: M
authors.lastname: Kawashita
authors.forename: Koji
authors.initials: K
authors.lastname: Taninai
authors.forename: Zhixia
authors.initials: Z
authors.lastname: Li
authors.forename: Kunio
authors.initials: K
authors.lastname: Ishikawa
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Yoshida
mesh_terms: D001031:Apatites / Q000737:chemistry*; D001842:Bone and Bones / Q000378:metabolism; D011232:Chemical Precipitation; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D003460:Crystallization; D004586:Electrophoresis; D006801:Humans; D008422:Materials Testing; D018625:Microscopy, Atomic Force; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D011791:Quartz / Q000737:chemistry*; D058525:Quartz Crystal Microbalance Techniques / Q000379:methods; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
chemical_list: D001031:Apatites; D020099:Coated Materials, Biocompatible; D011791:Quartz