Rapid Hydrothermal Synthesis of Submillimeter Ultralong Flexible Hydroxyapatite Fiber Using Different pH Regulators

doi:10.1007/s40195-016-0431-0

Abstract

Abstract:

：Hydroxyapatite fiber (HAF) was fabricated via a one-step hydrothermal route by using urea (CA), acetamide (AA) and propanamide (PA) as pH regulators, respectively, and the reaction time was only 0.5 h. The?HAF?synthesized by CA as the pH regulator was? agglomerated? with? irregular? morphology, while using AA or PA as the pH regulator, the HAF was composed of well-dispersed fibers with lengths larger than 200 μm. Two different morphologies form mainly due to the different hydrolysis rates of the pH regulators. Most of the fibers synthesized by the three pH regulators showed curving appearance, implying their outstanding flexibility. The technique in this paper allows the rapid formation of flexible HAF and may have wider applications in the restorations and reinforcement composites.

Key words: Hydroxyapatite, Fiber, Hydrothermal, PH regulators

Mei-li Qi, Gui-yong Xiao, Yu-peng Lu. Rapid Hydrothermal Synthesis of Submillimeter Ultralong Flexible Hydroxyapatite Fiber Using Different pH Regulators[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(7): 609-613.

Figures/Tables 4

Fig. 1 XRD patterns of the as-synthesized products obtained at 180 °C for 0.5 h by different pH regulators: a urea, b acetamide, c propanamide

Fig. 2 FE-SEM images of the as-synthesized HA obtained at 180 °C for 0.5 h by different pH regulators: a urea, c acetamide, e propanamide, b, d, f the enlarged images of the framed area in a, c, e, respectively

Fig. 3 Typical FE-SEM images of the flexible fibers obtained at 180 °C for 0.5 h by different pH regulators: a urea, b acetamide, c propanamide

Fig. 4 TEM images of the HAF obtained at 180 °C for 0.5 h by urea: a TEM with low magnification, b TEM and SAED pattern (inset), c HRTEM

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