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Structural analysis of hydroxyapatite coating on magnetite nanoparticles using energy filter imaging and electron tomography

, : Structural analysis of hydroxyapatite coating on magnetite nanoparticles using energy filter imaging and electron tomography. Journal of Electron Microscopy 59(2): 173-179

Magnetic nanoparticle (MNP) composites with a magnetite (Fe(3)O(4)) core and a hydroxyapatite (HAp, Ca(10)(PO(4))(6)(OH)(2)) coating were prepared using a precipitation method and a subsequent hydrothermal treatment. The hydrothermal treatment diminished the lepidocrocite layer on the magnetite, enhanced the crystal growth of HAp and dissolved the MNPs. The divalent iron ions dissolved into solvent were not substituted for the HAp lattice. The three-dimensional (3D) nanostructure, the crystal morphology of HAp covered with the MNPs and the interfacial nanostructure of magnetite/HAp were analyzed using an energy-filter transmission electron microscopy (EF-TEM) and visualized by computer tomography in transmission electron microscopy (TEM). EF-TEM and 3D reconstruction images using a tilted series of high-angle annular dark-field images showed that the needlelike HAp nanocrystals covered with a magnetite core and the crystal growth of HAp attached to the magnetite surface was inhibited as a result of the lower density of the nucleation site of the lepidocrocite layer. The dissolution of iron ion from MNPs and the interfacial interaction of HAp and magnetite could cause the needlelike morphology of HAp nanocrystals.


PMID: 19897510

DOI: 10.1093/jmicro/dfp055

Other references

Lucas C.E., 1977: Resuscitation of the injured patient the 3 phases of treatment. Surgical Clinics of North America 57(1): 3-15

McIntire, D.D.; Bloom, S.L.; Casey, B.M.; Leveno, K.J., 1999: Birth weight in relation to morbidity and mortality among newborn infants. Background: At any given gestational age, infants with low birth weight have relatively high morbidity and mortality. It is not known, however, whether there is a threshold weight below which morbidity and mortality are significantly greater, or w...

Lee, T.E.; Jr.; Scott, J.B.; Marcum, M.M., 2001: Vampyressa bidens. Mammalian Species. 26 December; 684: 1-3

Anonymous, 2002: Hypertensive events in adults. High blood pressure without organ involvement and hypertensive events requiring emergency care. Guidelines. Agence Française de Sécurité Sanitaire Des Produits de Santé. Journal des Maladies Vasculaires 27(4): 234-238

Greb Stephen F.; Chesnut D.R.J., 2001: Changing alluvial architecture in response to changing accommodation and sediment sources; examples from the Lower Pennsylvanian of the Illinois and central Appalachian basins, USA. Open-File Report - University of Nebraska-Lincoln, Conservation and Survey Division Pages 113

Crenesse, D.; Berlioz, M.; Albertini, M., 1999: Pediatric pulmonary function testing Which tests to suggest and at what age?. Revue des Maladies Respiratoires 16(SUPPL 3): 3S162-3S163, Jan

Wilson, C.M.; Duty, T.; Sandberg, M.; Persson, F.; Shumeiko, V.; Delsing, P., 2011: Photon generation in an electromagnetic cavity with a time-dependent boundary. We report the observation of photon generation in a microwave cavity with a time-dependent boundary condition. Our system is a microfabricated quarter-wave coplanar waveguide cavity. The electrical length of the cavity is varied by using the tunab...

Kruger, E.; Polling, L., 1984: First attempts at artificial breeding and larval rearing of the butter catfish, Eutropius depressirostris (Schilbeidae:Pisces). Water S A 10(2): 97-104

Mercer L.P.; Dodds S.J.; Gustafson J.M., 1986: Determination of indispensable and conditional amino acid ratios in diets. Federation Proceedings 45(4): 1091

Sham, J.S.; Wong, V.C.; Chiu, K.W.; Pang, P.K., 1984: Blood pressure homeostasis in Rana catesbeiana under normal and hypovolemic conditions. The effects of phentolamine, KBIV24 and captopril on the mean arterial blood pressure of normal and treated (dehydration, hemorrhage) frogs were determined. Hemorrhage but not dehydration led to a decrease in MAP. Only phentolamine attentuated MAP...