α-Tricalcium phosphate (α-TCP) hydrolysis into octacalcium phosphate (OCP) has been investigated in phosphoric acid solution at different concentrations of sodium polyacrylate (NaPA). The hydrolysis process has been followed by powder X-ray diffraction, infrared absorption and scanning electron microscopy analyses. In the absence of the polyelectrolyte, α-TCP undergoes a complete transformation into OCP in 24 h. The presence of polyacrylate in solution inhibits the hydrolysis so that a NaPA concentration of 0.5μM is sufficient to lengthen the time required to complete the hydrolysis to 4 days. The variation of Ca2+ concentration in the soaking solution suggests that the transformation occurs through α-TCP dissolution followed by OCP precipitation. The delayed OCP nucleation and growth in the presence of polyacrylate implies a preferential adsorption of the polyelectrolyte on the growing OCP crystals, which induces an anisotropic reduction of the coherence lengths of the perfect crystalline domains. © 2002 Elsevier Science Ltd. All rights reserved.

Bigi A., Boanini E., Botter R., Panzavolta S., Rubini K. (2002). α-tricalcium phosphate hydrolysis to octacalcium phosphate: Effect of sodium polyacrylate. BIOMATERIALS, 23(8), 1849-1854 [10.1016/S0142-9612(01)00311-8].

α-tricalcium phosphate hydrolysis to octacalcium phosphate: Effect of sodium polyacrylate

Bigi A.
;
Boanini E.;Panzavolta S.;Rubini K.
2002

Abstract

α-Tricalcium phosphate (α-TCP) hydrolysis into octacalcium phosphate (OCP) has been investigated in phosphoric acid solution at different concentrations of sodium polyacrylate (NaPA). The hydrolysis process has been followed by powder X-ray diffraction, infrared absorption and scanning electron microscopy analyses. In the absence of the polyelectrolyte, α-TCP undergoes a complete transformation into OCP in 24 h. The presence of polyacrylate in solution inhibits the hydrolysis so that a NaPA concentration of 0.5μM is sufficient to lengthen the time required to complete the hydrolysis to 4 days. The variation of Ca2+ concentration in the soaking solution suggests that the transformation occurs through α-TCP dissolution followed by OCP precipitation. The delayed OCP nucleation and growth in the presence of polyacrylate implies a preferential adsorption of the polyelectrolyte on the growing OCP crystals, which induces an anisotropic reduction of the coherence lengths of the perfect crystalline domains. © 2002 Elsevier Science Ltd. All rights reserved.
2002
Bigi A., Boanini E., Botter R., Panzavolta S., Rubini K. (2002). α-tricalcium phosphate hydrolysis to octacalcium phosphate: Effect of sodium polyacrylate. BIOMATERIALS, 23(8), 1849-1854 [10.1016/S0142-9612(01)00311-8].
Bigi A.; Boanini E.; Botter R.; Panzavolta S.; Rubini K.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/902538
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