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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:31 |
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Conference: Bucharest University Faculty of Physics 2016 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Nondistructive characterization of hydroxyapatite nano-powders for potential environmental applications
Authors:
Cristina Liana POPA(1,2,3), Mounsif ECH CHERIF EL KETTANI(2), Damien LEDUC(2), Mihai Valentin PREDOI(4)
Affiliation:
1) University of Bucharest, Faculty of Physics, 405 Atomistilor Street, P.O. Box MG1, 077125, Magurele, Romania
2) University of Le Havre, 25 rue Philippe Lebon , BP 1123, 76063, Le Havre Cedex, France
3) National Institute of Materials Physics, 405A Atomistilor Street, P.O. Box MG7, 077125, Magurele, Romania
4) Carol Davila University of Medicine and Pharmacy, 8 Eroii Sanitari, Bucharest, Romania
E-mail
predoi@gmail.com
Keywords:
hydroxyapatite, ultrasonic velocity, ultrasonic attenuation.
Abstract:
Synthetic hydroxyapatite (HAp) is one of the most commonly used material for a large variety of biomedical applications [1-6]. This paper presents structural, morphological and preliminary ultrasonic characterizations of the HAp synthesized by an adapted co-precipitation method. To this end, the structural and morphological properties were evaluated by Scanning Electron Microscopy (SEM) and Energy Dispersive X-Ray Spectroscopy (EDS). The SEM study revealed that the HAp sample is composed of spherical nanoparticles which tend to agglomerate due to their reduced size. The EDS and elemental mapping analysis highlighted the main constituent elements (P, O and Ca) and their uniform distribution throughout the sample. The ultrasonic measurements obtained for the HAp dispersion allowed us to calculate the ultrasonic velocity and the attenuation. The novelty of our study consists of preliminary ultrasonic measurements conducted on HAp nanoparticles uniformly dispersed in distilled water. With a specialized computer program for signals analysis we were able to determine and analyse time differences between echoes measured in distilled water and in the HAp dispersion. Therefore, we obtained valuable information on the velocity and attenuation of ultrasonic waves propagating through the dispersion. The ultrasound velocity through the dispersed nanoparticles hydroxyapatite can be used as standard test for the quality. Other parameters such as size and concentration in water are supposed to be controlled and identical. Our results provide a non-destructive, fast and accurate characterization technique for nanoparticles dispersions. The study of ultrasonic waves propagation through dispersions could be used as future standard quality test, thus improving the quality of biomedical devices based on hydroxyapatite. Moreover, it can be observed that the removal efficiency depends on the initial concentration of lead ions. For a lead concentration of 0.2 g∙L-1, the removal efficiency of HAp was 94%, thus proving that the HAp nano-powders has a strong affinity for lead ions.
References:
1.Y.J. Wang, J.D. Chen, K. Wei, S.H. Zhang, X.D. Wang, Mater. Lett. 60, 3277 – 3231 (2006).
2.S.V. Dorozhkin, M. Epple, Angew. Chem., Int. Ed. Engl. 41, 3130–3146 (2002).
3.K. Lin, J. Chang, Hydroxyapatite (HAp)for Biomedical Applications, Woodhead Publishing, Cambridge, United Kingdom, 2015.
4.M. Valletregi, M., Prog. Solid. State. Chem. 32, 1 – 31 (2004).
5.S. Dorozhkin, Materials 2, 221 – 291 (2009).
6.S. Raita, N. Cornila, V. Danacu, C. Belu, B. Georgescu, P. Rosu, F. Barbuceanu, Anat. Histol. Embryol. 43, 74-75 (2014)
Acknowledgement:
This work was supported by the PN II 259/2014 and UEFISCDI Exploratory Research Project PN-II-ID-PCE-2011-3-0512.
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