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Title: Mechanical adaptation of brachiopod shells via hydration-induced structural changes

Journal Article · · Nature Communications
 [1];  [2];  [2]; ORCiD logo [3]; ORCiD logo [1]; ORCiD logo [4];  [5]; ORCiD logo [6];  [7];  [6]; ORCiD logo [8];  [9];  [8];  [8];  [10]; ORCiD logo [6]
  1. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  2. Univ. of Bayreuth, and Bavarian Polymer Inst. (Germany)
  3. Paul Scherrer Inst. (PSI), Villigen (Switzerland); ETH and Univ. of Zürich (Switzerland)
  4. Alma Mater Studiorum Univ. di Bologna (Italy)
  5. Univ. of Bologna (Italy)
  6. Univ. of Edinburgh (United Kingdom)
  7. Heriot-Watt Univ., Edinburgh (United Kingdom)
  8. Univ. of Cambridge (United Kingdom)
  9. Brookhaven National Lab. (BNL), Upton, NY (United States)
  10. Munster Technological Univ., Cork (Ireland)

The function-optimized properties of biominerals arise from the hierarchical organization of primary building blocks. Alteration of properties in response to environmental stresses generally involves time-intensive processes of resorption and reprecipitation of mineral in the underlying organic scaffold. Here, we report that the load-bearing shells of the brachiopod Discinisca tenuis are an exception to this process. These shells can dynamically modulate their mechanical properties in response to a change in environment, switching from hard and stiff when dry to malleable when hydrated within minutes. Using ptychographic X-ray tomography, electron microscopy and spectroscopy, we describe their hierarchical structure and composition as a function of hydration to understand the structural motifs that generate this adaptability. Key is a complementary set of structural modifications, starting with the swelling of an organic matrix on the micron level via nanocrystal reorganization and ending in an intercalation process on the molecular level in response to hydration.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704
OSTI ID:
1827165
Report Number(s):
BNL--222286-2021-JAAM
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 12; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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