Open AccessControl of one‐dimensional hydroxyapatite nanocrystals at mild conditions: organic additive effects
Author(s) -
Kong Deyan,
Xiao Xinli,
Yang Yulin
Publication year - 2015
Publication title -
micro and nano letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.25
H-Index - 31
ISSN - 1750-0443
DOI - 10.1049/mnl.2014.0683
Subject(s) - nanocrystal , crystallinity , nucleation , precipitation , aqueous solution , materials science , chemical engineering , fourier transform infrared spectroscopy , transmission electron microscopy , hydrolysis , phase (matter) , chemistry , nanotechnology , organic chemistry , composite material , meteorology , engineering , physics
One‐dimensional hydroxyapatite (HAp, Ca 10 (PO4) 6 (OH) 2 ) nanocrystals have been successfully synthesised via the simple precipitation‐hydrolysis process on mild solution conditions. At the first precipitation step, the precursor samples of monetite phase CaHPO 4 were prepared with three kinds of organic additives. The results of X‐ray diffraction (XRD) patterns show that the structure and crystallinity of CaHPO 4 prepared with the different organic additives are different, which indicates that the organic additives exert influence on the crystal growth of CaHPO 4 . During the second process, the HAp nanocrystals with high aspect ratio grew up under a high pH condition. The XRD patterns show that the preference of every nanocrystal growth is the (002) plane. Transmission electron microscopy micrographs indicate that the HAp nanocrystals were affected by the reaction temperature and the pH values of the solution. The organic additives influenced the aspect ratio of HAp nanocrystals, and Fourier transform infrared spectra show that the organic additives were completely dissolved in the aqueous system. This indicates that the organic additives affected the formation of nucleation and growth of HAp nanocrystals, and the influence gradually decreased with the extension of the hydrolysis time, until the organic additives were detached from the HAp crystals.