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Abstract
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Tris (tris(hydroxymethyl)aminomethane) was used as the dispersant to enhance the colloidal stability of titania
nanoparticles in different alcohols (methanol, ethanol, isopropanol and butanol). Acetic acid (AA) was also
used to increase the ionization of Tris via acid-base reaction. The effect of Tris on the stability of suspensions in
the absence as well as the presence of AA was investigated by different analysis, such as conductivity and zeta
potential measurement as well as FTIR analysis. It was found that Tris is protonated and adsorbed on the titania
nanoparticles. It enhances their zeta potential and thus colloidal stability. The optimum concentration of
Tris increased with molecular weight of alcohol (0.1, 0.2, 0.3 and 0.6 g/l for methanolic, ethanolic, isopropanolic
and butanolic suspensions, respectively). The optimum concentration of Tris decreased to 0.1 g/ l for all AA
containing suspensions except the methanolic ones. Titania coating was obtained by electrophoretic deposition
(EPD) performed at 60 V. The current density and in-situ kinetics of deposition were recorded during EPD. It
was found that the kinetics of EPD is the fastest for the suspensions with the optimum concentration of Tris
(the highest zeta potential). Calcium phosphate phases were formed on the surface of titania coating after its
immersion for one week in SBF at 37.5 °C.
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