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Title: Gradual Ordering in Red Abalone Nacre

Abstract

Red abalone (Haliotis rufescens) nacre is a layered composite biomineral that contains crystalline aragonite tablets confined by organic layers. Nacre is intensely studied because its biologically controlled microarchitecture gives rise to remarkable strength and toughness, but the mechanisms leading to its formation are not well understood. Here we present synchrotron spectromicroscopy experiments revealing that stacks of aragonite tablet crystals in nacre are misoriented with respect to each other. Quantitative measurements of crystal orientation, tablet size, and tablet stacking direction show that orientational ordering occurs not abruptly but gradually over a distance of 50 {micro}m. Several lines of evidence indicate that different crystal orientations imply different tablet growth rates during nacre formation. A theoretical model based on kinetic and gradual selection of the fastest growth rates produces results in qualitative and quantitative agreement with the experimental data and therefore demonstrates that ordering in nacre is a result of crystal growth kinetics and competition either in addition or to the exclusion of templation by acidic proteins as previously assumed. As in other natural evolving kinetic systems, selection of the fastest-growing stacks of tablets occurs gradually in space and time. These results suggest that the self-ordering of the mineral phase, which may occurmore » completely independently of biological or organic-molecule control, is fundamental in nacre formation.« less

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
Advanced Light Source Division
OSTI Identifier:
951954
Report Number(s):
LBNL-1770E
Journal ID: ISSN 0002-7863; JACSAT; TRN: US0902369
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of the American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
36; ARAGONITE; CRYSTAL GROWTH; KINETICS; ORIENTATION; PROTEINS; SYNCHROTRONS; Nacre Aragonite X-PEEM

Citation Formats

Gilbert, P. U. P. A., Metzler, Rebecca A., Zhou, Dong, Scholl, Andreas, Doran, Andrew, Young, Anthony, Kunz, Martin, Tamura, Nobumichi, and Coppersmith, Susan N.. Gradual Ordering in Red Abalone Nacre. United States: N. p., 2008. Web. doi:10.1021/ja8065495.
Gilbert, P. U. P. A., Metzler, Rebecca A., Zhou, Dong, Scholl, Andreas, Doran, Andrew, Young, Anthony, Kunz, Martin, Tamura, Nobumichi, & Coppersmith, Susan N.. Gradual Ordering in Red Abalone Nacre. United States. doi:10.1021/ja8065495.
Gilbert, P. U. P. A., Metzler, Rebecca A., Zhou, Dong, Scholl, Andreas, Doran, Andrew, Young, Anthony, Kunz, Martin, Tamura, Nobumichi, and Coppersmith, Susan N.. Wed . "Gradual Ordering in Red Abalone Nacre". United States. doi:10.1021/ja8065495. https://www.osti.gov/servlets/purl/951954.
@article{osti_951954,
title = {Gradual Ordering in Red Abalone Nacre},
author = {Gilbert, P. U. P. A. and Metzler, Rebecca A. and Zhou, Dong and Scholl, Andreas and Doran, Andrew and Young, Anthony and Kunz, Martin and Tamura, Nobumichi and Coppersmith, Susan N.},
abstractNote = {Red abalone (Haliotis rufescens) nacre is a layered composite biomineral that contains crystalline aragonite tablets confined by organic layers. Nacre is intensely studied because its biologically controlled microarchitecture gives rise to remarkable strength and toughness, but the mechanisms leading to its formation are not well understood. Here we present synchrotron spectromicroscopy experiments revealing that stacks of aragonite tablet crystals in nacre are misoriented with respect to each other. Quantitative measurements of crystal orientation, tablet size, and tablet stacking direction show that orientational ordering occurs not abruptly but gradually over a distance of 50 {micro}m. Several lines of evidence indicate that different crystal orientations imply different tablet growth rates during nacre formation. A theoretical model based on kinetic and gradual selection of the fastest growth rates produces results in qualitative and quantitative agreement with the experimental data and therefore demonstrates that ordering in nacre is a result of crystal growth kinetics and competition either in addition or to the exclusion of templation by acidic proteins as previously assumed. As in other natural evolving kinetic systems, selection of the fastest-growing stacks of tablets occurs gradually in space and time. These results suggest that the self-ordering of the mineral phase, which may occur completely independently of biological or organic-molecule control, is fundamental in nacre formation.},
doi = {10.1021/ja8065495},
journal = {Journal of the American Chemical Society},
number = ,
volume = ,
place = {United States},
year = {Wed Sep 03 00:00:00 EDT 2008},
month = {Wed Sep 03 00:00:00 EDT 2008}
}