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Gradual ordering in red abalone nacre.

P U P A Gilbert¹, Rebecca A Metzler, Dong Zhou

¹Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, USA. pupa@physics.wisc.edu

Journal of the American Chemical Society

|December 4, 2008

Summary

Red abalone nacre ordering arises from crystal growth competition, not just organic templation. This study reveals gradual self-ordering in mineral phase formation, enhancing material properties.

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Area of Science:

Biomineralization
Materials Science
Crystallography

Background:

Nacre, a biomineral composite in red abalone, exhibits remarkable strength and toughness.
Its formation mechanisms, particularly the role of organic components, remain incompletely understood.
Nacre's microarchitecture is biologically controlled, but the precise ordering processes are debated.

Purpose of the Study:

To investigate the mechanisms of crystal ordering in red abalone nacre.
To determine the contribution of crystal growth kinetics versus organic templation.
To elucidate how microstructural ordering influences nacre's mechanical properties.

Main Methods:

Synchrotron spectromicroscopy for high-resolution imaging and chemical analysis.
Quantitative measurements of crystal orientation, tablet size, and stacking direction.
Development of a theoretical model based on kinetic growth and selection principles.

Main Results:

Aragonite tablet crystals in nacre are misoriented, with ordering occurring gradually over ~50 micrometers.
Different crystal orientations correlate with varying tablet growth rates.
A kinetic growth model accurately predicts experimental observations of gradual ordering.

Conclusions:

Nacre's self-ordering is driven by crystal growth kinetics and competition, potentially independent of organic molecule control.
Gradual selection of fastest-growing crystal stacks explains the observed microarchitecture.
This finding challenges previous assumptions about the exclusive role of organic templation in nacre formation.