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Calcium phosphate and derivatives have been known for decades as bone compatible biomaterials. In this work, the chemical composition, microtexture, and structure of calcium phosphate deposits on carbon cloths were investigated. Three main types of deposits, obtained through variation of current density in using the sono-electrodeposition technique, were elaborated. At low current densities, the deposit consists in a biomimetic, plate-like, carbonated calcium-deficient hydroxyapatite (CDA), likely resulting from the in situ hydrolysis of plate-like octacalcium phosphate (OCP), while at higher current densities the synthesis leads to a needle-like carbonated CDA. At intermediate current densities, a mixture of plate-like and needle-like carbonated CDA is deposited. This established that sono-electrodeposition is a versatile process that allows the coating of the carbon scaffold with biomimetic calcium phosphate while tuning the morphology and chemical composition of the deposited particles, thereby bringing new insights in the development of new biomaterials for bone repair.

Calcium phosphate (CaP) ceramics, e.g. hydroxyapatite Ca10(PO4)6(OH)2 (HAP) and tricalcium phosphate Ca3(PO4)2 (TCP), are widely employed in the field of bone tissue engineering due to their controlled biodegradability and excellent biocompatibility. In the present study, the chemical composition, microtexture and structure of CaP deposits on carbon fiber cloths (CFC) are investigated. Coatings of CaP or strontium-substituted calcium phosphate (Sr-CaP) on CFC are obtained by sono-electrodeposition process using cathodic polarization. At constant potential, the deposits consist in a biomimetic carbonated calcium-deficient hydroxyapatite (CaD-HAP), having a plate-like morphology with the possibility to control the Sr2+ incorporation. In orthopaedic field, CaP or Sr-CaP coated carbon fiber cloths offer new promising bioceramic materials for bone repair and regeneration.

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