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Kinetic Study on the Crystal Growth of Hydroxyapatite in the Presence of Cetyltrimethylammonium Bromide
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DOI：10.1021/acs.cgd.6c00135.png)
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Abstract
En 中文
The present investigation reports on the crystal growth of hydroxyapatite (HAP) on HAP crystals in supersaturated solutions at pH 7.40, 37 °C, both in the absence and in the presence of cetyltrimethylammonium bromide (CTAB) at subcritical critical micelle concentration levels (0.1–1.0 ppm). In CTAB-free solutions, the growth rate increased linearly with supersaturation, consistent with a surface-diffusion-controlled Burton, Cabrera, Frank spiral crystal growth mechanism. CTAB strongly inhibited HAP growth across the concentration range investigated. At 1 ppm of CTAB, the growth rate decreased by more than 75% relative to the control. The kinetic data, with and without CTAB, were fitted by a linear Langmuir-type adsorption model, indicating CTAB adsorption on active growth sites. The apparent affinity constant was high, kaff ≈ 1.4 × 106 L mol–1, comparable to organophosphorus inhibitors of calcium phosphate growth. X-ray diffraction confirmed that all precipitated solids were pure HAP. Scanning electron microscopy analysis showed that CTAB did not alter the prismatic morphology, while crystal dimensions varied with CTAB concentration. Overall, the kinetic, morphological, and adsorption results suggest that CTAB modulates HAP crystallization by forming an interfacial barrier that blocks active growth sites on the seed crystal surface.
Keywords:
Adsorption
Crystallization
Crystals
Hydroxyapatite
Supersaturation
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