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Modeling of the Hydrolysis of α‐Tricalcium Phosphate
Author(s) -
Ginebra MariaPau,
Fernández Enrique,
Driessens Ferdinand C. M.,
Planell Josep A.
Publication year - 1999
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1999.tb02160.x
Subject(s) - hydrolysis , diffusion , particle size , changeover , phosphate , chemical engineering , chemistry , kinetics , mineralogy , calcium , particle size distribution , particle (ecology) , inorganic chemistry , materials science , thermodynamics , organic chemistry , geology , physics , oceanography , quantum mechanics , transmission (telecommunications) , electrical engineering , engineering
Some of the formulations of apatitic calcium phosphate bone cements are based on the hydrolysis of α‐tricalcium phosphate (α‐Ca 3 (PO 4 ) 2 , α‐TCP). In this work the hydrolysis kinetics of α‐TCP are studied, taking into account the particle‐size distribution of the initial powder, to identify the mechanisms that control the reaction in its successive stages. The temporal evolution of the depth of reaction is calculated from the degree of reaction data, measured by X‐ray diffractometry. A kinetic model is proposed, which suggests the existence of two rate‐limiting mechanisms: initially, the surface area of the reactants and, subsequently, the diffusion through the hydrated layer formed around the reactants. For the specific particle size and preparation used, the controlling mechanism changeover takes place after 16 h of reaction.