Abstract
A set of analytical techniques is proposed for studying samples of calcium hydroxyapatite (HA) synthesized on the basis of calcium nitrate or calcium hydroxide as precursors. A comparative study of particle size distribution in HA samples is performed using capillary zone electrophoresis (CZE), scanning electron microscopy (SEM), dynamic light scattering (DS), and static light scattering (SS). The effect of heat treatment on the morphology of the synthesized products is evaluated. It is found that the effect of ultrasound (US) on the dispersity of HA particles in aqueous suspensions depends on the nature of the precursor and heat treatment. It is shown that the HA particles synthesized from calcium hydroxide (HA-OH) aggregate more rapidly than the particles synthesized from calcium nitrate (HA-NO 3 ). After the ultrasonic treatment of suspensions, the relative concentration of large HA-NO3 submicroparticles increased, while particle size distribution in the suspension of HA-OH remained virtually the same. The heat treatment of HA powders at 900°C reduced the ability of particles to aggregate. It is found by CZE that, with increasing time of ultrasonication of suspensions, the relative concentration of nanoscaled and similar in size HA-NO3 submicroparticles increased markedly, while it changed only slightly in the HA-OH suspension. The reasons for the differences are discussed. A procedure for determining the concentration of HA submicroparticles in suspension by CZE is proposed. A linear dependence of normalized peak areas on HA concentration in suspension is obtained.
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Original Russian Text © T.G. Dzherayan, N.G. Vanifatova, I.V. Fadeeva, R.Kh. Dzhenloda, A.A. Burmistrov, A.V. Rudnev, A.S. Fomin, 2015, published in Zhurnal Analiticheskoi Khimii, 2015, Vol. 70, No. 5, pp. 524–530.
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Dzherayan, T.G., Vanifatova, N.G., Fadeeva, I.V. et al. A capillary zone electrophoresis study of the effect of precursors and ultrasonic treatment on the morphology of hydroxyapatite particles. J Anal Chem 70, 608–614 (2015). https://doi.org/10.1134/S1061934815050032
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DOI: https://doi.org/10.1134/S1061934815050032