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Title: Mesocrystalline Ordering and Phase Transformation of Iron Oxide Biominerals in the Ultrahard Teeth of Cryptochiton stelleri

Journal Article · · Small Structures
 [1];  [1];  [2];  [3];  [4];  [5];  [4];  [4];  [4];  [2];  [2];  [6];  [6];  [7];  [3]; ORCiD logo [1]
  1. Univ. of California, Irvine, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Tokyo University of Agriculture and Technology (Japan)
  4. Univ. of California, Riverside, CA (United States)
  5. Oxford Instruments Asylum Research, Goleta, CA (United States)
  6. Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
  7. Okayama University (Japan)

Biological organisms naturally synthesize complex, hierarchical, multifunctional materials through mineralization processes at ambient conditions and under physiological pH. One such example is the ultrahard and wear-resistant radular teeth found in mollusks, which are used to scape against the rock to feed on algae. Herein, the biologically controlled structural development of the hard, outer magnetite-containing shell of the chitin teeth is revealed. Specifically, the formation of a series of mesocrystalline iron oxide phases, templated by chitin-binding proteins, is identified. The initial domains, consisting of ferrihydrite mesocrystals with a spherulite-like morphology, undergo a solid-state phase transformation to form magnetite while maintaining mesocrystallinity, likely via a shear-induced solid-state reaction, without any noticeable architectural changes. Subsequent growth via Ostwald ripening leads to nearly single-crystalline rod-like elements. In addition, an interpenetrating organic matrix is identified that, at early stages of tooth development, potentially contains iron-binding proteins that guide the self-assembly of the mesocrystalline mineral and influence the preferred orientation of the later-formed magnetite nanorods, which ultimately determines the mechanical behavior of the mature chiton teeth.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
US Army Research Office (ARO); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704
OSTI ID:
1886231
Report Number(s):
BNL-223264-2022-JAAM
Journal Information:
Small Structures, Journal Name: Small Structures Journal Issue: 4 Vol. 3; ISSN 2688-4062
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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