Abstract
To ensure polarity and to improve dispersibility for future application in polymer nanocomposite CNT was modified by sulfonitric mixture with molar ratio H2SO4:HNO3 5.50:1.43, at 110 °C, under stirring, for 3 h. The product labeled as oCNT was reacted with hydroxyapatite (HAp) at 2:1 oCNT:HAp mass ratio. Infrared spectra of oCNT and oCNT-HAp were different of the parent reagents. Crystallographic structure of CNT and oCNT was partially altered owing to the acid attack and reaction with HAp, respectively. Thermogravimetry indicated that HAp thermal behavior of was changed in the oCNT-HAp. By oCNT-HAp time decay curves were deduced that an effective chemical bond between oCNT and HAp occurred. The SEM/EDX analyses disclosed that oCNT disaggregation and the surface chemical reaction between oCNT and HAp. EDX revealed oxygen and sulfur in the oCNT and oCNT-HAp indicating that in some extent both oxidation and sulfonation of aromatic ring occurred. The hybrid particle is constituted by 70 and 30% of oCNT and HAp, respectively.
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