TY - JOUR
T1 - Influence of temperature on calcium hydroxyapatite nanopowders
AU - Saladino, Maria Luisa
AU - Caponetti, Eugenio
AU - Chillura Martino, Delia Francesca
AU - Zanotto, Antonio
PY - 2012
Y1 - 2012
N2 - The aim of this work is to investigate the effects of thermal treatment, in the range of temperature between 80°C - 900°C, on crystallinity, morphology and particles size of calcium hydroxylapatite nanopowders (HAp). A complete study was carried out applying 31P Magic Angle Spinning NMR, X-ray diffraction, nitrogen porosimetry and Transmis- sion Electron Microscopy techniques. HAp specimens were prepared by chemical precipitation in an aqueous solution of calcium nitrate and ammonium hydrogen phosphate. The thermal treatment performed, showed the formation of crystals whose appearance has three main morphologies and different particles size. HAp treated up to 500°C showed a set of needle-like shape crystals with a low surface area value. These crystals turned into rod-like crystals with tem- perature increase, along with an increase in crystallite size. At 900°C was detected a hexagonal hydroxylapatite phase. Furthermore, Dynamic Light Scattering explored a stable HAp dispersion. The isopropyl alcohol dispersion resulted stable for at least two weeks, useful to create layers of determined morphology nanoparticles.
AB - The aim of this work is to investigate the effects of thermal treatment, in the range of temperature between 80°C - 900°C, on crystallinity, morphology and particles size of calcium hydroxylapatite nanopowders (HAp). A complete study was carried out applying 31P Magic Angle Spinning NMR, X-ray diffraction, nitrogen porosimetry and Transmis- sion Electron Microscopy techniques. HAp specimens were prepared by chemical precipitation in an aqueous solution of calcium nitrate and ammonium hydrogen phosphate. The thermal treatment performed, showed the formation of crystals whose appearance has three main morphologies and different particles size. HAp treated up to 500°C showed a set of needle-like shape crystals with a low surface area value. These crystals turned into rod-like crystals with tem- perature increase, along with an increase in crystallite size. At 900°C was detected a hexagonal hydroxylapatite phase. Furthermore, Dynamic Light Scattering explored a stable HAp dispersion. The isopropyl alcohol dispersion resulted stable for at least two weeks, useful to create layers of determined morphology nanoparticles.
KW - Alcohol Dispersion
KW - Hydroxylapatite
KW - Precipitation
KW - Thermal Treatment
KW - Alcohol Dispersion
KW - Hydroxylapatite
KW - Precipitation
KW - Thermal Treatment
UR - http://hdl.handle.net/10447/74687
M3 - Article
VL - 1
SP - 21
EP - 28
JO - ADVANCES IN NANOPARTICLES
JF - ADVANCES IN NANOPARTICLES
SN - 2169-0510
ER -