X-ray Linear Dichroism in Apatite
- Univ. of Wisconsin, Madison, WI (United States). Dept. of Physics
- Aarhus Univ., Aarhus (Denmark). Dept. of Chemistry
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Physical Sciences Division
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
- Univ. of Pittsburgh, PA (United States). Dept. Oral Biology and Bioengineering, Center for Craniofacial Regeneration, McGowan Inst. for Regenerative Medicine, School of Dental Medicine
- Univ. of Wisconsin, Madison, WI (United States). Dept. of Physics, and Dept. of Chemistry, Materials Science, and Geoscience
The recent observation in parrotfish teeth of X-ray linear dichroism motivated an in-depth investigation into this spectroscopic effect in various apatite crystals, including geologic hydroxyapatite (Ca5(PO4)3OH), fluorapatite (Ca5(PO4)3F), and their biogenic counterparts in human bone, mouse enamel, and in parrotfish bone, dentin, and enameloid, the equivalent of dental enamel in certain fish. These data are important because they now enable visualization of the nano- to microscale structure of apatite crystals in teeth and bone. Polarization-dependent imaging contrast (PIC) maps of lamellar bone, obtained with a new method that minimizes space-charge and charging effects, show the expected rotating apatite crystal orientations. PIC maps of mouse enamel reveal a complex arrangement of hydroxyapatite crystals perpendicular to the dentin-enamel junction, with rods arranged in a decussation pattern in inner enamel and nearly parallel to one another in outer enamel. In both inner and outer enamel crystal c-axes are not always aligned with the rod elongation direction.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC02-05CH11231; AC05-76RL01830
- OSTI ID:
- 1542317
- Alternate ID(s):
- OSTI ID: 1770150
- Report Number(s):
- PNNL-SA-131664; ark:/13030/qt63x8s8dm
- Journal Information:
- Journal of the American Chemical Society, Vol. 140, Issue 37; ISSN 0002-7863
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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