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Abstract
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Different compositions of bioglass and hydroxyapatite composite coatings were fabricated by electrophoretic deposition on titanium substrate and their various properties were investigated. Stability and characteristics of the prepared suspensions using isopropanol and triethanolamine (TEA) were also studied by zeta potential, FTIR and conductivity measurements. Results showed that optimum amount of TEA to make stable suspension is influenced by particle size and consequently this affects suspension conductivity and deposition kinetics either. Moreover porosity of the coatings microstructure was affected by the particles size, as the incorporation of finer HA particles among coarser BG particles leaded to more compact coatings. Obtained data contended that bioglass (BG) coating includes 50%wt hydroxyapatite (HA) had the highest bioactivity response within 1 day immersion in SBF solution, as well as the maximum bonding strength. HA particles acted as the pre-available seeds for the apatite nucleation while the dissolution of BG particles provided the required ions for their growth resulting in the synergistic effect.
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