Crystallization of Calcium Deficient Hydroxyapatite Nanocrystals on Woven Silk Fibroin Fabric via Precipitation Process.

Journal of Nanoscience and Nanotechnology
Piyapong Pankaew, Pattarinee White

Abstract

A high bioactivity calcium deficient hydroxyapatite (Ca-def HAp) nanocrystal crystallized on a high strength woven silk fibroin (SF) fabric was characterized with the aim to utilize their advantages for the future bone implant applications. Apatite crystal was grown on SF fiber templates by precipitation reaction of Ca(NO₃)₂ prepared from chicken eggshells in (NH₄)₃PO₄ solutions, adjusted pH by NH₄OH solution. In the apatite crystallization process, (NH₄)₃PO₄ solutions prepared at different pH values were poured into the glass dishes containing SF fiber templates/Ca(NO₃)₂ solution, allowed reaction time of only a minute. The results had shown that, the Ca/P ratio of the crystals grown on SF fiber templates were increased through increasing in initial pH value of reaction. Its morphology had been changed from the plate-shaped to particle-shaped crystals. The plainwoven SF fabric was chosen as the suitable template to grow Ca-def HAp crystal for its much higher tensile strength (840 MPa), as compared to 470 MPa for the twill-woven SF fabric. The Cadef HAp nanocrystals on plain-woven SF fabric were confirmed the Ca/P ratio at 1.52 with X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. The clusters size of...Continue Reading

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