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Title: Exploring the Mineral Composition, Structure, and Function of a Freshwater Bivalve Adhesive

Journal Article · · Advanced Materials Interfaces
ORCiD logo [1];  [1];  [1];  [1];  [1];  [1];  [2];  [3];  [4]
  1. Department of Physics and Astronomy Colgate University 13 Oak Dr. Hamilton NY 13346 USA
  2. Materials Research Center Rensselear Polytechnic Institute 110 8th Street Troy NY 12180 USA
  3. Department of Earth &, Environmental Sciences KU Leuven Celestijnenlaan 200 E Leuven B‐3001 Belgium
  4. Department of Geosciences Union College 807 Union St. Schenectady NY 12308 USA

Abstract Etheria elliptica is a freshwater oyster that produces an adhesive that hardens underwater, allowing them to attach to other oysters, rocks, wood, and other natural substrates, producing complex oyster bed communities. Despite the importance of the adhesive in oyster bed formation, little is known about its chemical composition, structure, or mechanical properties. Through a combination of scanning electron microscopy (SEM), x‐ray photoemission electron microscopy (X‐PEEM), infrared (IR) spectroscopy, microhardness testing, and nanoindentation, it is found that the oyster adhesive consists entirely of aragonite nanoparticles that clump together into crystallites of varied shape, size, and orientation. The crystallite clumping density varies from the exterior of the adhesive to the interior, with the adhesive closest to the prismatic layer generally being denser. With this variation in density comes a variation in material properties with the exterior adhesive layer being softer and more flexible and the interior adhesive layer being harder and less elastic, or more similar to the prismatic and nacre shell structures produced by the E. elliptica . The resultant material exhibits varied materials properties, despite similar mineral composition.

Sponsoring Organization:
USDOE
Grant/Contract Number:
NONE; AC02-05CH11231
OSTI ID:
2345806
Alternate ID(s):
OSTI ID: 2345808
Journal Information:
Advanced Materials Interfaces, Journal Name: Advanced Materials Interfaces Journal Issue: 17 Vol. 11; ISSN 2196-7350
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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