English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/227824
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE
Exportar a otros formatos:

Title

Origin of the biphase nature and surface roughness of biogenic calcite secreted by the giant barnacle Austromegabalanus psittacus

AuthorsCheca, Antonio G. CSIC ORCID; Macías-Sánchez, Elena; Rodríguez-Navarro, Alejandro B.; Sánchez Navas, Antonio CSIC ORCID; Lagos, Nelson A.
KeywordsCalcium carbonates
Biomineralization
Nacre
Biomaterials
Mineralogy
Nanoscale biophysics
Structural materials
Issue Date8-Oct-2020
PublisherNature Publishing Group
CitationScientific Reports 10: 16784 (2020)
AbstractThe calcite grains forming the wall plates of the giant barnacle Austramegabalanus psittacus have a distinctive surface roughness made of variously sized crystalline nanoprotrusions covered by extremely thin amorphous pellicles. This biphase (crystalline-amorphous) structure also penetrates through the crystal’s interiors, forming a web-like structure. Nanoprotrusions very frequently elongate following directions related to the crystallographic structure of calcite, in particular, the <− 441> directions, which are the strongest periodic bond chains (PBCs) in calcite. We propose that the formation of elongated nanoprotrusions happens during the crystallization of calcite from a precursor amorphous calcium carbonate (ACC). This is because biomolecules integrated within the ACC are expelled from such PBCs due to the force of crystallization, with the consequent formation of uninterrupted crystalline nanorods. Expelled biomolecules accumulate in adjacent regions, thereby stabilizing small pellicle-like volumes of ACC. With growth, such pellicles become occluded within the crystal. In summary, the surface roughness of the biomineral surface reflects the complex shape of the crystallization front, and the biphase structure provides evidence for crystallization from an amorphous precursor. The surface roughness is generally explained as resulting from the attachment of ACC particles to the crystal surface, which later crystallised in concordance with the crystal lattice. If this was the case, the nanoprotrusions do not reflect the size and shape of any precursor particle. Accordingly, the particle attachment model for biomineral formation should seek new evidence.
Publisher version (URL)http://dx.doi.org/10.1038/s41598-020-73804-8
URIhttp://hdl.handle.net/10261/227824
Identifiersdoi: 10.1038/s41598-020-73804-8
issn: 2045-2322
Appears in Collections:(IACT) Artículos
Files in This Item:
File Description SizeFormat 
Checa_AG_2020_ScientificReports10_16784.pdf5,4 MBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.