Spatial Organization of Hydroxyapatite Nanorods on a Substrate via a Biomimetic Approach

The growth of uniform single-crystal HAp (hydroxyapatite) nanorods on specific sites on a substrate is achieved. HAp nanorods were synthesized under hydrothermal conditions in a solution containing calcium and phosphate ions, urea as a source of base, and with gelatin as a structure directing agent....

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Bibliographic Details
Published in:Crystal growth & design 2013-10, Vol.13 (10), p.4213-4219
Main Authors: Tseng, Yao-Hung, Birkbak, Mie Elholm, Birkedal, Henrik
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Methods of crystal growth
physics of crystal growth
Methods of nanofabrication
Nanoscale materials and structures: fabrication and characterization
Other topics in nanoscale materials and structures
Physics
Quantum wires
Theory and models of crystal growth
physics of crystal growth, crystal morphology and orientation
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Summary:The growth of uniform single-crystal HAp (hydroxyapatite) nanorods on specific sites on a substrate is achieved. HAp nanorods were synthesized under hydrothermal conditions in a solution containing calcium and phosphate ions, urea as a source of base, and with gelatin as a structure directing agent. The nanorods are hundreds of micrometers in length and 50–200 nm in width. Without gelatin, platelike HAp crystals were formed. To grow these uniform HAp nanorods on specific sites on a substrate, the surface of a gold-coated glass slide was coated by a self-assembled monolayer of 11-mercaptoundecanoic acid by stamping with a patterned PDMS (polydimethylsiloxane) stamp. The HAp nanorods were grown exclusively in the carboxylate functionalized regions. Selective area electron diffraction analyses show that the single-crystal HAp nanorods formed on the substrate grow along the crystallographic c-axis. In comparison to the nonpatterned sample, an increase of the X-ray diffraction intensity ratio of (00l)/(h00) peaks in the patterned sample indicates that nanorods are preferentially oriented with their c-axes perpendicular to the substrate, which was confirmed by SEM cross-sectional images. In this strategy, both the morphology and the deposition sites of HAp nanorods are controlled.
ISSN:1528-7483
1528-7505
DOI:10.1021/cg301719v