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Biomineral nanoparticles are space-filling
Li Yang1, Christopher E Killian, Martin Kunz
1Earth Science Division, Lawrence Berkeley National Lab, Berkeley, CA 94720, USA.
Nanoscale
|November 18, 2010
Summary
Sea urchin biominerals form from amorphous calcium carbonate (ACC) nanoparticles that crystallize into calcite. Their measured surface areas are comparable to geologic calcite, suggesting space-filling ACC is the precursor for these unique biomineral structures.
Area of Science:
- Biomineralization
- Materials Science
- Geology
Background:
- Sea urchin biominerals are composed of calcite.
- These structures form from aggregating nanoparticles of amorphous calcium carbonate (ACC).
- The crystallization process leads to macroscopic single crystals of calcite.
Purpose of the Study:
- To measure the surface areas of sea urchin biominerals.
- To compare these surface areas with geologic calcite crystals and synthetic mesocrystals.
- To propose a structural precursor for echinoderm biominerals.
Main Methods:
- Surface area measurements of sea urchin biominerals.
- Comparison with surface area data of geologic calcite and synthetic mesocrystals.
Main Results:
- Sea urchin biominerals exhibit surface areas comparable to space-filling geologic calcite crystals.
- Unlike synthetic mesocrystals, these biominerals are not porous.
- The findings suggest a distinct formation pathway for biogenic calcite.
Conclusions:
- Space-filling amorphous calcium carbonate (ACC) is proposed as the structural precursor for echinoderm biominerals.
- The formation mechanism results in non-porous, high surface area calcite structures.
- This contrasts with the porous nature of synthetic mesocrystals, highlighting unique biomineralization strategies.
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