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Facile synthesis of calcium borate nanoparticles and the annealing effect on their structure and size


Haghiri, Maryam Erfani and Saion, Elias and Soltani, Nayereh and Hashim, Mansor and Wan Abdullah, Wan Saffiey and Navasery, Manizheh (2012) Facile synthesis of calcium borate nanoparticles and the annealing effect on their structure and size. International Journal of Molecular Sciences, 13 (11). pp. 14434-14445. ISSN 1422-0067


Calcium borate nanoparticles have been synthesized by a thermal treatment method via facile co-precipitation. Differences of annealing temperature and annealing time and their effects on crystal structure, particle size, size distribution and thermal stability of nanoparticles were investigated. The formation of calcium borate compound was characterized by X-ray diffraction (XRD) and Fourier Transform Infrared spectroscopy (FTIR), Transmission electron microscopy (TEM), and Thermogravimetry (TGA). The XRD patterns revealed that the co-precipitated samples annealed at 700 °C for 3 h annealing time formed an amorphous structure and the transformation into a crystalline structure only occurred after 5 h annealing time. It was found that the samples annealed at 900 °C are mostly metaborate (CaB2O4) nanoparticles and tetraborate (CaB4O7) nanoparticles only observed at 970 °C, which was confirmed by FTIR. The TEM images indicated that with increasing the annealing time and temperature, the average particle size increases. TGA analysis confirmed the thermal stability of the annealed samples at higher temperatures.

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Official URL or Download Paper: http://www.mdpi.com/1422-0067/13/11/14434

Additional Metadata

Item Type: Article
Divisions: Faculty of Science
DOI Number: https://doi.org/10.3390/ijms131114434
Publisher: MDPI AG
Keywords: Annealing temperature; Annealing time; Calcium borate; Co-precipitation; Nanoparticles
Depositing User: Nabilah Mustapa
Date Deposited: 05 Jun 2017 05:33
Last Modified: 05 Jun 2017 05:33
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.3390/ijms131114434
URI: http://psasir.upm.edu.my/id/eprint/52280
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